1
|
Vara Prasad R, Kumar Y, Arun Kumar R, Banoo T, Nagarajan S. Regioselective synthesis of 4-arylamino-1,2-naphthoquinones in eutectogel as a confined reaction medium using LED light. Org Biomol Chem 2024. [PMID: 38651749 DOI: 10.1039/d4ob00140k] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/25/2024]
Abstract
Predicting selectivity and conversion in a confined reaction medium under photochemical conditions is highly challenging as compared to the corresponding conventional synthesis. Herein, we report the use of a simple carbohydrate-derived eutectogel to facilitate LED-light-induced regioselective synthesis of 4-arylamino-1,2-naphthoquinones in good yield. This methodology, by including a reusable reaction medium, proved to have the potential of affording the regioselective formation of various desired products in good yields.
Collapse
Affiliation(s)
- R Vara Prasad
- Assembled Organic & Hybrid Materials Research Lab, Department of Chemistry, National Institute of Technology Warangal, Hanumakonda -506004, Telangana State, India.
| | - Yogendra Kumar
- Assembled Organic & Hybrid Materials Research Lab, Department of Chemistry, National Institute of Technology Warangal, Hanumakonda -506004, Telangana State, India.
| | - R Arun Kumar
- Assembled Organic & Hybrid Materials Research Lab, Department of Chemistry, National Institute of Technology Warangal, Hanumakonda -506004, Telangana State, India.
| | - Tohira Banoo
- Assembled Organic & Hybrid Materials Research Lab, Department of Chemistry, National Institute of Technology Warangal, Hanumakonda -506004, Telangana State, India.
| | - Subbiah Nagarajan
- Assembled Organic & Hybrid Materials Research Lab, Department of Chemistry, National Institute of Technology Warangal, Hanumakonda -506004, Telangana State, India.
| |
Collapse
|
2
|
Rajput D, Jan G, Karuppasamy M, Bhuvanesh N, Nagarajan S, Maheswari CU, Menéndez JC, Sridharan V. Rapid Assembly of Functionalized 2 H-Chromenes and 1,2-Dihydroquinolines via Microwave-Assisted Secondary Amine-Catalyzed Cascade Annulation of 2- O/ N-Propargylarylaldehydes with 2,6-Dialkylphenols. J Org Chem 2023; 88:11778-11792. [PMID: 37556760 DOI: 10.1021/acs.joc.3c01082] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 08/11/2023]
Abstract
An efficient, secondary amine-catalyzed cascade annulation of 2-O/N-propargylarylaldehydes with 2,6-dialkylphenols was established to access biologically relevant functionalized 2H-chromenes and 1,2-dihydroquinolines tethered with a synthetically useful p-quinone methide scaffold in high yields under microwave irradiation and conventional heating conditions. The microwave-assisted strategy was convenient, clean, rapid, and high yielding in which the reactions were completed in just 15 min, and the yields obtained were up to 95%. This highly atom-economical domino process constructed two new C-C double bonds and a six-membered O/N-heterocyclic ring in a single synthetic operation. Its mechanism process was rationalized as involving sequential iminium ion formation, nucleophilic addition, and intramolecular annulation steps. Furthermore, the synthesized 2H-chromene derivatives were transformed into valuable indeno[2,1-c]chromenes, 5H-indeno[2,1-c]quinolines, and oxireno[2,3-c]chromene via a palladium-catalyzed double C-H bond activation process and epoxidation, respectively.
Collapse
Affiliation(s)
- Diksha Rajput
- Department of Chemistry and Chemical Sciences, Central University of Jammu, Rahya-Suchani (Bagla), District-Samba, Jammu 181143, Jammu and Kashmir, India
| | - Gowsia Jan
- Department of Chemistry and Chemical Sciences, Central University of Jammu, Rahya-Suchani (Bagla), District-Samba, Jammu 181143, Jammu and Kashmir, India
| | - Muthu Karuppasamy
- Department of Chemistry and Chemical Sciences, Central University of Jammu, Rahya-Suchani (Bagla), District-Samba, Jammu 181143, Jammu and Kashmir, India
| | - Nattamai Bhuvanesh
- Department of Chemistry, Texas A & M University, College Station, Texas 77843, United States
| | - Subbiah Nagarajan
- Department of Chemistry, National Institute of Technology, Warangal, Warangal 506004, Telangana, India
| | - C Uma Maheswari
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur 613401, Tamil Nadu, India
| | - J Carlos Menéndez
- Unidad de Química Orgánica y Farmacéutica, Departamento de Química en Ciencias Farmacéuticas, Facultad de Farmacia, Universidad Complutense de Madrid, Madrid 28040, Spain
| | - Vellaisamy Sridharan
- Department of Chemistry and Chemical Sciences, Central University of Jammu, Rahya-Suchani (Bagla), District-Samba, Jammu 181143, Jammu and Kashmir, India
| |
Collapse
|
3
|
Rajkumar DB, Gnanaoli K, Puhazhendhi A, Arunachalam T, Nagarajan S, Sridharan V, Sivalingam S, Maheswari CU. Iodine-catalyzed three-component annulation: access to highly fluorescent trisubstituted thiophenes. Chem Commun (Camb) 2023; 59:10129-10132. [PMID: 37494020 DOI: 10.1039/d3cc02711b] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 07/27/2023]
Abstract
An efficient synthesis of highly fluorescent trisubstituted thiophenes was achieved via iodine-catalyzed, base-promoted annulation employing elemental sulfur as a sulfur source. The compounds exhibit excellent photophysical properties like solid-state fluorescence, high quantum yield and solvatochromism. As these thiophene derivatives have potential application in the development of optoelectronic devices, gram-scale synthesis of the desired heterocycles was demonstrated.
Collapse
Affiliation(s)
- Deepan Babu Rajkumar
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur-613401, India.
| | - Karthiyayini Gnanaoli
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur-613401, India.
| | - Arulmozhi Puhazhendhi
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur-613401, India.
| | | | - Subbiah Nagarajan
- Department of Chemistry, National Institute of Technology-Warangal, Warangal-506004, India
| | - Vellaisamy Sridharan
- Department of Chemistry and Chemical Sciences, Central University of Jammu, Rahya-Suchani (Bagla), District-Samba, Jammu-181143, J&K, India
| | - Soumya Sivalingam
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur-613401, India.
| | - C Uma Maheswari
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur-613401, India.
| |
Collapse
|
4
|
Rajput D, Tsering D, Karuppasamy M, Kapoor KK, Nagarajan S, Maheswari CU, Bhuvanesh N, Sridharan V. Diversity-Oriented Synthesis of Benzo[ f][1,4]oxazepine-, 2 H-Chromene-, and 1,2-Dihydroquinoline-Fused Polycyclic Nitrogen Heterocycles under Microwave-Assisted Conditions. J Org Chem 2023. [PMID: 37318181 DOI: 10.1021/acs.joc.3c00552] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/16/2023]
Abstract
An efficient, diversity-oriented synthesis of oxazepino[5,4-b]quinazolin-9-ones, 6H-chromeno[4,3-b]quinolines, and dibenzo[b,h][1,6]naphthyridines was established involving a substrate-based approach under microwave-assisted and conventional heating conditions in high yields (up to 88%). The CuBr2-catalyzed, chemoselective cascade annulation of O-propargylated 2-hydroxybenzaldehydes and 2-aminobenzamides delivered oxazepino[5,4-b]quinazolin-9-ones involving a 6-exo-trig cyclization-air oxidation-1,3-proton shift-7-exo-dig cyclization sequence. This one-pot process showed excellent atom economy (-H2O) and constructed two new heterocyclic rings (six- and seven-membered) and three new C-N bonds in a single synthetic operation. On the other side of diversification, the reaction between O/N-propargylated 2-hydroxy/aminobenzaldehydes and 2-aminobenzyl alcohols delivered 6H-chromeno[4,3-b]quinolines and dibenzo[b,h][1,6]naphthyridines involving sequential imine formation-[4 + 2] hetero-Diels-Alder reaction-aromatization steps. The influence of microwave assistance was superior to conventional heating, where the reactions were clean, rapid, and completed in 15 min, and the conventional heating required a longer reaction time at a relatively elevated temperature.
Collapse
Affiliation(s)
- Diksha Rajput
- Department of Chemistry and Chemical Sciences, Central University of Jammu, Rahya-Suchani (Bagla), District-Samba, Jammu 181143, Jammu and Kashmir, India
| | - Dolma Tsering
- Department of Chemistry, University of Jammu, Jammu 180006, Jammu and Kashmir, India
| | - Muthu Karuppasamy
- Department of Chemistry and Chemical Sciences, Central University of Jammu, Rahya-Suchani (Bagla), District-Samba, Jammu 181143, Jammu and Kashmir, India
| | - Kamal K Kapoor
- Department of Chemistry, University of Jammu, Jammu 180006, Jammu and Kashmir, India
| | - Subbiah Nagarajan
- Department of Chemistry, National Institute of Technology Warangal, Warangal 506004, Telangana, India
| | - C Uma Maheswari
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur613401, Tamil Nadu, India
| | - Nattamai Bhuvanesh
- Department of Chemistry, Texas A&M University, College Station, Texas 77843, United States
| | - Vellaisamy Sridharan
- Department of Chemistry and Chemical Sciences, Central University of Jammu, Rahya-Suchani (Bagla), District-Samba, Jammu 181143, Jammu and Kashmir, India
| |
Collapse
|
5
|
Singh V, Thamizhanban A, Lalitha K, Subbiah DK, Rachamalla AK, Rebaka VP, Banoo T, Kumar Y, Sridharan V, Ahmad A, Maheswari Chockalingam U, Balaguru Rayappan JB, Khan AA, Nagarajan S. Self-Assembling Nanoarchitectonics of Twisted Nanofibers of Fluorescent Amphiphiles as Chemo-Resistive Sensor for Methanol Detection. Gels 2023; 9:442. [PMID: 37367114 DOI: 10.3390/gels9060442] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2023] [Revised: 05/23/2023] [Accepted: 05/24/2023] [Indexed: 06/28/2023] Open
Abstract
The inhalation, ingestion, and body absorption of noxious gases lead to severe tissue damage, ophthalmological issues, and neurodegenerative disorders; death may even occur when recognized too late. In particular, methanol gas present in traces can cause blindness, non-reversible organ failure, and even death. Even though ample materials are available for the detection of methanol in other alcoholic analogs at ppm level, their scope is very limited because of the use of either toxic or expensive raw materials or tedious fabrication procedures. In this paper, we report on a simple synthesis of fluorescent amphiphiles achieved using a starting material derived from renewable resources, this material being methyl ricinoleate in good yields. The newly synthesized bio-based amphiphiles were prone to form a gel in a broad range of solvents. The morphology of the gel and the molecular-level interaction involved in the self-assembly process were thoroughly investigated. Rheological studies were carried out to probe the stability, thermal processability, and thixotropic behavior. In order to evaluate the potential application of the self-assembled gel in the field of sensors, we performed sensor measurements. Interestingly, the twisted fibers derived from the molecular assembly could be able to display a stable and selective response towards methanol. We believe that the bottom-up assembled system holds great promise in the environmental, healthcare, medicine, and biological fields.
Collapse
Affiliation(s)
- Vandana Singh
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur 613401, Tamil Nadu, India
| | - Ayyapillai Thamizhanban
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur 613401, Tamil Nadu, India
| | - Krishnamoorthy Lalitha
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur 613401, Tamil Nadu, India
| | - Dinesh Kumar Subbiah
- Centre for Nano Technology & Advanced Biomaterials (CeNTAB), School of Electrical & Electronics Engineering, SASTRA Deemed University, Thanjavur 613401, Tamil Nadu, India
| | - Arun Kumar Rachamalla
- Assembled Organic and Hybrid Materials Research Laboratory, Department of Chemistry, National Institute of Technology Warangal, Warangal 506004, Telangana, India
| | - Vara Prasad Rebaka
- Assembled Organic and Hybrid Materials Research Laboratory, Department of Chemistry, National Institute of Technology Warangal, Warangal 506004, Telangana, India
| | - Tohira Banoo
- Assembled Organic and Hybrid Materials Research Laboratory, Department of Chemistry, National Institute of Technology Warangal, Warangal 506004, Telangana, India
| | - Yogendra Kumar
- Assembled Organic and Hybrid Materials Research Laboratory, Department of Chemistry, National Institute of Technology Warangal, Warangal 506004, Telangana, India
| | - Vellaisamy Sridharan
- Department of Chemistry and Chemical Sciences, Central University of Jammu, Rahya-Suchani (Bagla), District-Samba, Jammu 181143, Jammu and Kashmir, India
| | - Asrar Ahmad
- Center for Sickle Cell Disease, College of Medicine, Howard University, Washington, DC 20001, USA
| | - Uma Maheswari Chockalingam
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur 613401, Tamil Nadu, India
| | - John Bosco Balaguru Rayappan
- Centre for Nano Technology & Advanced Biomaterials (CeNTAB), School of Electrical & Electronics Engineering, SASTRA Deemed University, Thanjavur 613401, Tamil Nadu, India
| | - Azmat Ali Khan
- Pharmaceutical Biotechnology Laboratory, Department of Pharmaceutical Chemistry, College of Pharmacy, King Saud University, Riyadh 11451, Saudi Arabia
| | - Subbiah Nagarajan
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur 613401, Tamil Nadu, India
- Assembled Organic and Hybrid Materials Research Laboratory, Department of Chemistry, National Institute of Technology Warangal, Warangal 506004, Telangana, India
| |
Collapse
|
6
|
Jandial T, Gupta A, Jan G, Karuppasamy M, Nagarajan S, Maheswari CU, Sridharan V. A microwave-assisted intramolecular aminopalladation-triggered domino sequence: an atom economical route to 5,10-dihydroindeno[1,2- b]indoles. Org Biomol Chem 2023; 21:3121-3131. [PMID: 36960815 DOI: 10.1039/d3ob00041a] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 03/25/2023]
Abstract
A microwave-assisted, palladium(II)-catalyzed cascade reaction of 2-alkynylanilines tethered with an α,β-unsaturated carbonyl moiety was established to access 5,10-dihydroindeno[1,2-b]indoles in high yields (up to 84%) in a short reaction time. This operationally simple cascade process shows 100% atom economy and allows the construction of two new five-membered rings and two new (1 C-C and 1 C-N) bonds in a single synthetic attempt. The mechanistic pathway of this reaction is visualized involving intramolecular aminopalladation (5-endo-dig) followed by carbopalladation (olefin insertion) and protonolysis steps. A systematic comparison between microwave irradiation and conventional heating methods was also performed to demonstrate the supremacy of the microwave-assisted approach. This domino reaction requires no protecting groups for the amino group and the palladium catalyst needs no ligands. To the best of our knowledge, this is the first report on microwave-assisted nucleopalladation-initiated cascade transformation.
Collapse
Affiliation(s)
- Tanvi Jandial
- Department of Chemistry and Chemical Sciences, Central University of Jammu, Rahya-Suchani (Bagla), District-Samba, Jammu-181143, J&K, India.
| | - Anish Gupta
- Department of Chemistry and Chemical Sciences, Central University of Jammu, Rahya-Suchani (Bagla), District-Samba, Jammu-181143, J&K, India.
| | - Gowsia Jan
- Department of Chemistry and Chemical Sciences, Central University of Jammu, Rahya-Suchani (Bagla), District-Samba, Jammu-181143, J&K, India.
| | - Muthu Karuppasamy
- Department of Chemistry and Chemical Sciences, Central University of Jammu, Rahya-Suchani (Bagla), District-Samba, Jammu-181143, J&K, India.
| | - Subbiah Nagarajan
- Department of Chemistry, National Institute of Technology, Warangal, Warangal-506004, Telangana, India
| | - C Uma Maheswari
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur-613401, Tamil Nadu, India
| | - Vellaisamy Sridharan
- Department of Chemistry and Chemical Sciences, Central University of Jammu, Rahya-Suchani (Bagla), District-Samba, Jammu-181143, J&K, India.
| |
Collapse
|
7
|
Vinoth P, Karuppasamy M, Gupta A, Nagarajan S, Maheswari CU, Sridharan V. Intramolecular oxypalladation-initiated domino sequence: One-pot, two-step regioselective synthesis of isoquinolines. Tetrahedron 2023. [DOI: 10.1016/j.tet.2023.133272] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/26/2023]
|
8
|
Gupta A, Jandial T, Karuppasamy M, Bhuvanesh N, Nagarajan S, Maheswari CU, Sridharan V. Palladium-Catalyzed Intramolecular Oxypalladation-Initiated Cascade: Solvent-Dependent Chemodivergent Approach to Functionalized Benzazepines and Tetrahydroquinolines. Chem Commun (Camb) 2023; 59:5233-5236. [PMID: 37040145 DOI: 10.1039/d3cc01370g] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/03/2023]
Abstract
Palladium-catalyzed, solvent-dependent intramolecular oxypalladation-triggered domino sequences of internal alkynes bearing tethered nucleophilic carboxylic ester and electrophilic enone functionalities were developed for the chemodivergent synthesis of two completely distinct biologically significant...
Collapse
Affiliation(s)
- Anish Gupta
- Department of Chemistry and Chemical Sciences, Central University of Jammu, Rahya-Suchani (Bagla), District-Samba, Jammu, 181143, JK, India.
| | - Tanvi Jandial
- Department of Chemistry and Chemical Sciences, Central University of Jammu, Rahya-Suchani (Bagla), District-Samba, Jammu, 181143, JK, India.
| | - Muthu Karuppasamy
- Department of Chemistry and Chemical Sciences, Central University of Jammu, Rahya-Suchani (Bagla), District-Samba, Jammu, 181143, JK, India.
| | - Nattamai Bhuvanesh
- Department of Chemistry, Texas A & M University, College Station, Texas, 77843, USA
| | - Subbiah Nagarajan
- Department of Chemistry, National Institute of Technology, Warangal, Warangal, 506004, Telangana, India
| | - C Uma Maheswari
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur, 613401, Tamil Nadu, India
| | - Vellaisamy Sridharan
- Department of Chemistry and Chemical Sciences, Central University of Jammu, Rahya-Suchani (Bagla), District-Samba, Jammu, 181143, JK, India.
| |
Collapse
|
9
|
Sonthi VK, Nagarajan S, Krishnaraj N. An Intelligent Telugu Handwritten Character Recognition using Multi-Objective Mayfly Optimization with Deep Learning Based DenseNet Model. ACM T ASIAN LOW-RESO 2022. [DOI: 10.1145/3520439] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
Handwritten character recognition process has gained significant attention among research communities due to the application in assistive technologies for visually impaired people, human robot interaction, automated registry for business document, and so on. Handwritten character recognition of Telugu language is hard owing to the absence of massive dataset and trained convolution neural network (CNN). Therefore, this paper introduces an intelligent Telugu character recognition using multi-objective mayfly optimization with deep learning (MOMFO-DL) model. The proposed MOMFO-DL technique involves DenseNet-169 model as a feature extractor to generate a useful set of feature vectors. Moreover, functional link neural network (FLNN) is used as a classification model to recognize and classify the printer characters. The design of MOMFO technique for the parameter optimization of DenseNet model and FLNN model shows the novelty of the work. The use of MOMFO technique helps to optimally tune the parameters in such a way that the overall performance can be improved. The extensive experimental analysis takes place on benchmark datasets and the outcomes are examined with respect to different measures. The experimental results pointed out the supremacy of the MOMFO technique over the recent state of art methods.
Collapse
Affiliation(s)
| | - S. Nagarajan
- Associate Professor, Department of CSE, FEAT, Annamalai University
| | - N. Krishnaraj
- Associate Professor, School of Computing, SRM Institute of Science & Technology
| |
Collapse
|
10
|
Vijayabaskaran S, B. D, Damodaran V, Nagarajan S. Association between Lipid Levels and Short-Term Heart Rate Variability (HRV) In Type 2 Diabetes. Egyptian Academic Journal of Biological Sciences C, Physiology and Molecular Biology 2022. [DOI: 10.21608/eajbsc.2022.213921] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022] Open
|
11
|
Singh V, Prasad YS, Rachamalla AK, Rebaka VP, Banoo T, Maheswari CU, Sridharan V, Lalitha K, Nagarajan S. Hybrid hydrogels derived from renewable resources as a smart stimuli responsive soft material for drug delivery applications. RSC Adv 2022; 12:2009-2018. [PMID: 35425233 PMCID: PMC8979040 DOI: 10.1039/d1ra08447j] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2021] [Accepted: 12/29/2021] [Indexed: 12/02/2022] Open
Abstract
The design and synthesis of amphiphilic molecules play a crucial role in fabricating smart functional materials via self-assembly. Especially, biologically significant natural molecules and their structural analogues have inspired chemists and made a major contribution to the development of advanced smart materials. In this report, a series of amphiphilic N-acyl amides were synthesized from natural precursors using a simple synthetic protocol. Interestingly, the self-assembly of amphiphiles 6a and 7a furnished a hydrogel and oleogel in vegetable oils. Morphological analysis of gels revealed the existence of a 3-dimensional fibrous network. Thermoresponsive and thixotropic behavior of these gels were evaluated using rheological analysis. A composite gel prepared by the encapsulation of curcumin in the hydrogel formed from 7a displayed a gel–sol transition in response to pH and could act as a dual channel responsive drug carrier. The design and synthesis of amphiphilic molecules play a crucial role in fabricating smart functional materials via self-assembly.![]()
Collapse
Affiliation(s)
- Vandana Singh
- School of Chemical and Biotechnology, SASTRA Deemed University Thanjavur-613401 Tamil Nadu India
| | - Yadavali Siva Prasad
- School of Chemical and Biotechnology, SASTRA Deemed University Thanjavur-613401 Tamil Nadu India .,Department of Biomedical Engineering, Saveetha School of Engineering Saveetha Nagar Thandalam Tamil Nadu India
| | - Arun Kumar Rachamalla
- Department of Chemistry, National Institute of Technology Warangal Warangal-506004 Telangana India +91-9940430715
| | - Vara Prasad Rebaka
- Department of Chemistry, National Institute of Technology Warangal Warangal-506004 Telangana India +91-9940430715
| | - Tohira Banoo
- Department of Chemistry, National Institute of Technology Warangal Warangal-506004 Telangana India +91-9940430715
| | - C Uma Maheswari
- School of Chemical and Biotechnology, SASTRA Deemed University Thanjavur-613401 Tamil Nadu India
| | - Vellaisamy Sridharan
- Department of Chemistry and Chemical Sciences, Central University of Jammu Rahya-Suchani (Bagla), District-Samba Jammu-181143 J&K India
| | - Krishnamoorthy Lalitha
- School of Chemical and Biotechnology, SASTRA Deemed University Thanjavur-613401 Tamil Nadu India
| | - Subbiah Nagarajan
- School of Chemical and Biotechnology, SASTRA Deemed University Thanjavur-613401 Tamil Nadu India .,Department of Chemistry, National Institute of Technology Warangal Warangal-506004 Telangana India +91-9940430715
| |
Collapse
|
12
|
Bermingham WH, Bhogal R, Nagarajan S, Mutlu L, El-Shabrawy RM, Madhan R, Maheshwari UM, Murali M, Kudagammana ST, Shrestha R, Sumantri S, Christopher DJ, Mahesh PA, Dedicoat M, Krishna MT. 'Practical management of suspected hypersensitivity reactions to anti-tuberculosis drugs.'. Clin Exp Allergy 2021; 52:375-386. [PMID: 34939251 DOI: 10.1111/cea.14084] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Revised: 12/07/2021] [Accepted: 12/09/2022] [Indexed: 11/28/2022]
Abstract
Tuberculosis (TB) is the commonest cause of death by a single infectious agent globally and ranks amongst the top ten causes of global mortality. The incidence of TB is highest in Low-Middle Income countries (LMICs). Prompt institution of, and compliance with, therapy are cornerstones for a favourable outcome in TB and to mitigate the risk of multiple drug resistant (MDR)-TB, which is challenging to treat. There is some evidence that adverse drug reactions (ADRs) and hypersensitivity reactions (HSRs) to anti-TB drugs occur in over 60% and 3-4% of patients respectively. Both ADRs and HSRs represent significant barriers to treatment adherence and are recognised risk factors for MDR-TB. HSRs to anti-TB drugs are usually cutaneous and benign, occur within few weeks after commencement of therapy and are likely to be T-cell mediated. Severe and systemic T-cell mediated HSRs and IgE mediated anaphylaxis to anti-TB drugs are relatively rare, but important to recognise and treat promptly. T-cell mediated HSRs are more frequent amongst patients with co-existing HIV infection. Some patients develop multiple sensitisation to anti-TB drugs. Whilst skin tests, patch tests and in vitro diagnostics have been used in the investigation of HSRs to anti-TB drugs, their predictive value is not established, they are onerous, require specialist input of an allergist and are resource-dependent. This is compounded by the global, unmet demand for allergy specialists, particularly in low income countries (LICs) / LMICs and now the challenging circumstances of the SARS-CoV-2 pandemic. This narrative review provides a critical analysis of the limited published evidence on this topic and proposes a cautious and pragmatic approach to optimise and standardise the management of HSRs to anti-TB drugs. This includes clinical risk stratification and a dual strategy involving sequential re-challenge and rapid drug desensitisation. Furthermore, a concerted international effort is needed to generate real-time data on ADRs, HSRs, safety and clinical outcomes of these interventions.
Collapse
Affiliation(s)
- W H Bermingham
- Department of Allergy & Immunology, University Hospitals Birmingham NHS Foundation Trust, Birmingham, UK
| | - R Bhogal
- Department of Pharmacy, University Hospitals Birmingham NHS Foundation Trust, Birmingham, UK
| | - S Nagarajan
- Department of Allergy and Immunology, Mallige Hospital, Bangalore, India
| | - L Mutlu
- Department of Allergy & Immunology, University Hospitals Birmingham NHS Foundation Trust, Birmingham, UK
| | | | - R Madhan
- Department of Pharmacy Practice, JSS College of Pharmacy, JSS AHER, Mysuru, India
| | - U M Maheshwari
- Department of Respiratory Medicine, St Johns Medical College, Bengaluru, India
| | - M Murali
- Division of Allergy and Clinical Immunology, Department of Medicine, Massachusetts General hospital, Boston, MA, 02114, USA
| | - S T Kudagammana
- Faculty of Medicine, University of Peradeniya, Honorary Consultant Paediatrician, Teaching hospital, Peradeniya, Sri Lanka
| | - R Shrestha
- Departments of Clinical Pharmacology, Dhulikhel Hospital, Kathmandu University Hospital, Nepal
| | - S Sumantri
- Department of Internal Medicine, Universitas Pelita Harapan, Siloam Academic Hospital Lippo Village, Tangerang, Banten, Indonesia
| | - D J Christopher
- Department of Pulmonary Medicine, Christian Medical College, Vellore, India
| | - P A Mahesh
- Department of Respiratory Medicine, JSS Medical College, JSSAHER, Mysuru, India
| | - M Dedicoat
- Department of Infectious Diseases and Tropical Medicine, University Hospitals Birmingham NHS Foundation Trust, Birmingham, UK
| | - M T Krishna
- Department of Allergy & Immunology, University Hospitals Birmingham NHS Foundation Trust, Birmingham, UK.,Institute of Immunology and Immunotherapy, University of Birmingham, UK
| |
Collapse
|
13
|
Pavithra T, Devi ES, Nagarajan S, Sridharan V, Maheswari CU. Sulfur Catalyzed Metal‐ and Solvent‐Free ABB'C Four‐Component Synthesis of
N
‐Arylidene‐2‐aryl‐imidazo[1‐2‐
a
]azin‐3‐amines via Strecker Reaction. ChemistrySelect 2021. [DOI: 10.1002/slct.202100682] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
Affiliation(s)
- Thangavel Pavithra
- Department of Chemistry, School of Chemical and Biotechnology SASTRA Deemed University Thanjavur 613401 India
| | - E. Sankari Devi
- Department of Chemistry, School of Chemical and Biotechnology SASTRA Deemed University Thanjavur 613401 India
| | - Subbiah Nagarajan
- Department of Chemistry National Institute of Technology-Warangal Warangal 506004 India
| | - Vellaisamy Sridharan
- Department of Chemistry and Chemical Sciences Central University of Jammu, Rahya-Suchani (Bagla) District-Samba Jammu 181143, J&K India
| | - C. Uma Maheswari
- Department of Chemistry, School of Chemical and Biotechnology SASTRA Deemed University Thanjavur 613401 India
| |
Collapse
|
14
|
Kumar M, Murugkar HV, Nagarajan S, Tosh C, Patil S, Nagaraja KH, Rajukumar K, Senthilkumar D, Dubey SC. Experimental infection and pathology of two highly pathogenic avian influenza H5N1 viruses isolated from crow and chicken in house crows (Corvus splendens). Acta Virol 2021; 64:325-330. [PMID: 32985206 DOI: 10.4149/av_2020_306] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
We investigated the experimental infection of two highly pathogenic avian influenza H5N1 viruses isolated from crow (A/crow/Assam/142119/2008) and chicken (A/chicken/Sikkim/151466/2009) in house crows (Corvus splendens). Both viruses caused infection in crows, where four out of six and three out of six crows succumbed to H5N1 infection within 11 days post challenge by crow and chicken viruses, respectively. The major clinical signs in crows were wing paralysis, circling and torticollis. The virus shedding detected from swabs was not persistent in both crow nor chicken viruses. Both viruses were isolated more frequently from oral swabs than from cloacal swabs. Both virus strains were isolated from brain, lungs, heart, liver, pancreas, spleen, large intestines of crows that succumbed to H5N1 infection. The surviving birds seroconverted in response to H5N1 virus infection. Microscopically, both viruses caused coagulative necrosis in pancreas and kidneys. Brain showed gliosis and neuronal degeneration. This experimental study highlights that crows could be infected with H5N1 viruses from different hosts with minor differences in pathogenicity. Therefore, it is imperative to carry out surveillance of highly pathogenic avian influenza H5N1 virus in synanthropic birds along with biosecurity measures to mitigate the H5N1 spread in poultry population. Keywords: chicken virus; crow virus; highly pathogenic avian influenza; house crows.
Collapse
|
15
|
Thamizhanban A, Balaji S, Lalitha K, Prasad YS, Prasad RV, Kumar RA, Maheswari CU, Sridharan V, Nagarajan S. Glycolipid-Based Oleogels and Organogels: Promising Nanostructured Structuring Agents. J Agric Food Chem 2020; 68:14896-14906. [PMID: 33284625 DOI: 10.1021/acs.jafc.0c02936] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/12/2023]
Abstract
Over the past few decades, the scientific community is actively involved in the development of edible structuring agents suitable for food, cosmetics, agricultural, pharmaceutical, and biotechnology applications. In particular, edible oil structuring using simple amphiphiles would be the best alternative for the currently used trans and saturated fatty acids, which cause deleterious health effects and cardiovascular problems. In this report, we have made an attempt to address the aforementioned consequences, by synthesizing a new class of structuring agents by a judicious combination of δ-gluconolactone and ricinoleic acid, compounds classified as GRAS, using simple steps in good yield. To our delight, the synthesized glycolipids self-assemble in a wide variety of vegetable oils and commercially viable glycerol, ethylene glycol, and polyethylene glycol via various intermolecular interactions to form a gel. The morphology of molecular gels was investigated by optical microscopy and FESEM analysis, which reveal the existence of a tubular architecture with a diameter ranging from 75 to 150 nm. Rheological studies disclosed the viscoelastic nature, thermal processability, and thixotropic behavior of both oleogels and organogels. Altogether, self-assembled oleogel and organogel reported in this paper would potentially be used in food, agricultural, cosmetics, pharmaceutical, and biotechnological applications.
Collapse
Affiliation(s)
- Ayyapillai Thamizhanban
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur 613401, Tamil Nadu, India
| | - Srikanth Balaji
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur 613401, Tamil Nadu, India
| | - Krishnamoorthy Lalitha
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur 613401, Tamil Nadu, India
| | - Yadavali Siva Prasad
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur 613401, Tamil Nadu, India
| | - R Vara Prasad
- Department of Chemistry, National Institute of Technology Warangal, Warangal 506004, Telangana, India
| | - R Arun Kumar
- Department of Chemistry, National Institute of Technology Warangal, Warangal 506004, Telangana, India
| | - C Uma Maheswari
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur 613401, Tamil Nadu, India
| | - Vellaisamy Sridharan
- Department of Chemistry and Chemical Sciences, Central University of Jammu, Rahya-Suchani (Bagla), District-Samba, Jammu 181143, India
| | - Subbiah Nagarajan
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur 613401, Tamil Nadu, India
- Department of Chemistry, National Institute of Technology Warangal, Warangal 506004, Telangana, India
| |
Collapse
|
16
|
Prasad YS, Miryala S, Lalitha K, Saritha B, Maheswari CU, Sridharan V, Srinandan CS, Nagarajan S. An injectable self-healing anesthetic glycolipid-based oleogel with antibiofilm and diabetic wound skin repair properties. Sci Rep 2020; 10:18017. [PMID: 33093507 PMCID: PMC7582191 DOI: 10.1038/s41598-020-73708-7] [Citation(s) in RCA: 9] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/24/2020] [Accepted: 09/22/2020] [Indexed: 12/26/2022] Open
Abstract
Globally, wound infections are considered as one of the major healthcare problems owing to the delayed healing process in diabetic patients and microbial contamination. Thus, the development of advanced materials for wound skin repair is of great research interest. Even though several biomaterials were identified as wound healing agents, gel-based scaffolds derived from either polymer or small molecules have displayed promising wound closure mechanism. Herein, for the first time, we report an injectable and self-healing self-assembled anesthetic oleogel derived from glycolipid, which exhibits antibiofilm and wound closure performance in diabetic rat. Glycolipid derived by the reaction of hydrophobic vinyl ester with α-chloralose in the presence of novozyme 435 undergoes spontaneous self-assembly in paraffin oil furnished an oleogel displaying self-healing behavior. In addition, we have prepared composite gel by encapsulating curcumin in the 3D fibrous network of oleogel. More interestingly, glycolipid in its native form demoed potential in disassembling methicillin-resistant Staphylococcus aureus, methicillin-susceptible Staphylococcus aureus, and Pseudomonas aeruginosa biofilms. Both oleogel and composite gel enhanced the wound skin repair in diabetic induced Wistar rats by promoting collagen synthesis, controlling free radical generation and further regulating tissue remodeling phases. Altogether, the reported supramolecular self-assembled anesthetic glycolipid could be potentially used for diabetic skin wound repair and to treat bacterial biofilm related infections.
Collapse
Affiliation(s)
- Yadavali Siva Prasad
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur, Tamil Nadu, 613401, India
| | - Sandeep Miryala
- Biofilm Biology Lab, Centre for Research in Infectious Diseases, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur, Tamil Nadu, 613401, India
| | - Krishnamoorthy Lalitha
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur, Tamil Nadu, 613401, India
| | - Balasubramani Saritha
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur, Tamil Nadu, 613401, India
| | - C Uma Maheswari
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur, Tamil Nadu, 613401, India
| | - Vellaisamy Sridharan
- Department of Chemistry and Chemical Sciences, Central University of Jammu, Rahya-Suchani (Bagla), District-Samba, Jammu, J&K, 181143, India
| | - C S Srinandan
- Biofilm Biology Lab, Centre for Research in Infectious Diseases, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur, Tamil Nadu, 613401, India.
| | - Subbiah Nagarajan
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur, Tamil Nadu, 613401, India.
- Department of Chemistry, National Institute of Technology Warangal, Warangal, Telangana, 506004, India.
| |
Collapse
|
17
|
Parvathy P, Dheepika R, Abhijnakrishna R, Imran P, Nagarajan S. Fluorescence quenching of triarylamine functionalized phenanthroline-based probe for detection of picric acid. J Photochem Photobiol A Chem 2020. [DOI: 10.1016/j.jphotochem.2020.112780] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/11/2022]
|
18
|
Devi ES, Pavithra T, Tamilselvi A, Nagarajan S, Sridharan V, Maheswari CU. N-Heterocyclic Carbene Catalyzed Synthesis of Trisubstituted Epoxides via Tandem Amidation/Epoxidation Sequence. Org Lett 2020; 22:3576-3580. [PMID: 32271025 DOI: 10.1021/acs.orglett.0c01017] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/19/2022]
Abstract
A tandem amidation/epoxidation sequence between various substituted chalcones and N,N-dimethylformamide (DMF) for the synthesis of trisubstituted epoxides employing N-heterocyclic carbene catalysis was developed. This reaction was performed under metal-free conditions in the presence of tert-butyl hydroperoxide (TBHP) as the oxidant. Trisubstituted epoxides bearing a ketone and an amide functionality (N,N-dimethyl formyl group) were synthesized starting from a wide range of chalcones in moderate to good yields with excellent diastereoselectivity.
Collapse
Affiliation(s)
- E Sankari Devi
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur-613401, India
| | - Thangavel Pavithra
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur-613401, India
| | - A Tamilselvi
- Department of Chemistry, Thiagarajar College, Madurai-625009, India
| | - Subbiah Nagarajan
- Department of Chemistry, National Institute of Technology-Warangal, Warangal-506004, India
| | - Vellaisamy Sridharan
- Department of Chemistry and Chemical Sciences, Central University of Jammu, Rahya-Suchani (Bagla), District-Samba, Jammu-181143, J&K, India
| | - C Uma Maheswari
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur-613401, India
| |
Collapse
|
19
|
Thamizhanban A, Sarvepalli GP, Lalitha K, Prasad YS, Subbiah DK, Das A, Balaguru Rayappan JB, Nagarajan S. Fabrication of Biobased Hydrophobic Hybrid Cotton Fabrics Using Molecular Self-Assembly: Applications in the Development of Gas Sensor Fabrics. ACS Omega 2020; 5:3839-3848. [PMID: 32149210 PMCID: PMC7057323 DOI: 10.1021/acsomega.9b02733] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/24/2019] [Accepted: 01/28/2020] [Indexed: 05/10/2023]
Abstract
Inadvertent inhalation of various volatile organic compounds during industrial processes, such as coal and metal mining, metal manufacturing, paper and pulp industry, food processing, petroleum refining, and concrete and chemical industries, has caused an adverse effect on human health. In particular, exposure to trimethylamine (TMA), a fishy odor poisonous gas, resulted in numerous health hazards such as neurotoxicity, irritation in eyes, nose, skin, and throat, blurred vision, and many more. According to the environmental protection agency, TMA in the level of 0.10 ppm is generally considered as safe, and excess dose results in "trimethylaminuria" or "fish odor syndrome." In order to avoid the health hazards associated with the inhalation of TMA, there is an urge to design a sensor for TMA detection even at low levels for use in food-processing industries, medical diagnosis, and environment. In this report, for the first time, we have developed a TMA sensor fabric using a sequential self-assembly process from silver-incorporated glycolipids. Formation of self-assembled supramolecular architecture, interaction of the assembled structure with the cotton fabric, and sensing mechanism were completely investigated with the help of various instrumental methods. To our surprise, the developed fabric displayed a transient response for 1-500 ppm of TMA and a stable response toward 100 ppm of TMA for 15 days. We believe that the reported flexible TMA sensor fabrics developed via the sequential self-assembly process hold great promise for various innovative applications in environment, healthcare, medicine, and biology.
Collapse
Affiliation(s)
- Ayyapillai Thamizhanban
- Department
of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur 613401, Tamil Nadu, India
| | - Guru Prasanth Sarvepalli
- Department
of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur 613401, Tamil Nadu, India
- Centre
for Nano Technology & Advanced Biomaterials (CeNTAB) and School
of Electrical & Electronics Engineering, SASTRA Deemed University, Thanjavur 613401, Tamil Nadu, India
| | - Krishnamoorthy Lalitha
- Department
of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur 613401, Tamil Nadu, India
| | - Yadavali Siva Prasad
- Department
of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur 613401, Tamil Nadu, India
| | - Dinesh Kumar Subbiah
- Centre
for Nano Technology & Advanced Biomaterials (CeNTAB) and School
of Electrical & Electronics Engineering, SASTRA Deemed University, Thanjavur 613401, Tamil Nadu, India
| | - Apurba Das
- Department
of Textile & Fibre Engineering, Indian
Institute of Technology, New Delhi 110 016, India
| | - John Bosco Balaguru Rayappan
- Centre
for Nano Technology & Advanced Biomaterials (CeNTAB) and School
of Electrical & Electronics Engineering, SASTRA Deemed University, Thanjavur 613401, Tamil Nadu, India
- E-mail: (J.B.B.R.)
| | - Subbiah Nagarajan
- Department
of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur 613401, Tamil Nadu, India
- Department
of Chemistry, National Institute of Technology
Warangal, Warangal 506004, Telangana, India
- E-mail: , (S.N.)
| |
Collapse
|
20
|
Karuppasamy M, Vinoth P, Pradeep N, Nagarajan S, Maheswari CU, Sridharan V. Regioselective synthesis of tetrahydroquinolines via syn- and anti-nucleopalladation-initiated cascade processes. Org Biomol Chem 2020; 18:8474-8485. [DOI: 10.1039/d0ob01840f] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/26/2022]
Abstract
Regioselective synthesis of tetrahydroquinolines via nucleopalladation-initiated cascade sequences was established.
Collapse
Affiliation(s)
- Muthu Karuppasamy
- Department of Chemistry
- School of Chemical and Biotechnology
- SASTRA Deemed University
- Thanjavur-613401
- India
| | - Perumal Vinoth
- Department of Chemistry
- School of Chemical and Biotechnology
- SASTRA Deemed University
- Thanjavur-613401
- India
| | - N. Pradeep
- Department of Chemistry
- School of Chemical and Biotechnology
- SASTRA Deemed University
- Thanjavur-613401
- India
| | - Subbiah Nagarajan
- Department of Chemistry
- National Institute of Technology
- Warangal-506004
- India
| | - C. Uma Maheswari
- Department of Chemistry
- School of Chemical and Biotechnology
- SASTRA Deemed University
- Thanjavur-613401
- India
| | - Vellaisamy Sridharan
- Department of Chemistry
- School of Chemical and Biotechnology
- SASTRA Deemed University
- Thanjavur-613401
- India
| |
Collapse
|
21
|
|
22
|
Pavithra T, Devi ES, Nagarajan S, Sridharan V, Maheswari CU. Metal and Solvent-Free Synthesis of 2H-Pyrido[1,2-a]pyrimidin-2-ones Catalyzed by Elemental Sulfur. European J Org Chem 2019. [DOI: 10.1002/ejoc.201901356] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Thangavel Pavithra
- Department of Chemistry; School of Chemical and Biotechnology; SASTRA Deemed University; 613401 Thanjavur India
| | - E. Sankari Devi
- Department of Chemistry; School of Chemical and Biotechnology; SASTRA Deemed University; 613401 Thanjavur India
| | - Subbiah Nagarajan
- Department of Chemistry; National Institute of Technology-Warangal; 506004 Warangal India
| | - Vellaisamy Sridharan
- Department of Chemistry and Chemical Sciences; Central University of Jammu; Rahya-Suchani (Bagla) -181143, J&K District-Samba Jammu India
| | - C. Uma Maheswari
- Department of Chemistry; School of Chemical and Biotechnology; SASTRA Deemed University; 613401 Thanjavur India
| |
Collapse
|
23
|
Vachan BS, Ramesh A, Karuppasamy M, Muthukrishnan I, Nagarajan S, Menéndez JC, Maheswari CU, Sridharan V. Oxidant-free, three-component synthesis of 7-amino-6 H-benzo[ c]chromen-6-ones under green conditions. RSC Adv 2019; 9:32946-32953. [PMID: 35529159 PMCID: PMC9073129 DOI: 10.1039/c9ra07108c] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/05/2019] [Accepted: 10/03/2019] [Indexed: 01/24/2023] Open
Abstract
An oxidant-free three-component synthesis of biologically significant 7-amino-6H-benzo[c]chromen-6-ones was established involving a Sc(OTf)3 catalyzed three-component reaction between primary amines, β-ketoesters and 2-hydroxychalcones under green conditions. In this strategy, both the B and C rings of 6H-benzo[c]chromen-6-ones were constructed simultaneously starting from acyclic precursors by generating four new bonds including two C-C, one C-N and one C-O in a single synthetic operation. The mechanism of this sequential cascade process involves the initial formation of a β-enaminone intermediate followed by Michael addition with 2-hydroxychalcone, intramolecular cyclization, dehydration, lactonization and aromatization steps. Unlike the related literature approaches, this reaction delivered the products without the addition of any external oxidants to achieve the key aromatization step.
Collapse
Affiliation(s)
- B S Vachan
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University Thanjavur-613401 Tamil Nadu India
| | - Aishwarya Ramesh
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University Thanjavur-613401 Tamil Nadu India
| | - Muthu Karuppasamy
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University Thanjavur-613401 Tamil Nadu India
| | - Isravel Muthukrishnan
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University Thanjavur-613401 Tamil Nadu India
| | - Subbiah Nagarajan
- Department of Chemistry, National Institute of Technology Warangal Warangal-506004 Telangana India
| | - J Carlos Menéndez
- Unidad de Química Orgánica y Farmacéutica, Departamento de Química en Ciencias Farmacéuticas, Facultad de Farmacia, Universidad Complutense 28040 Madrid Spain
| | - C Uma Maheswari
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University Thanjavur-613401 Tamil Nadu India
| | - Vellaisamy Sridharan
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University Thanjavur-613401 Tamil Nadu India
- Department of Chemistry and Chemical Sciences, Central University of Jammu Rahya-Suchani (Bagla), District-Samba Jammu-181143 J&K India
| |
Collapse
|
24
|
Kumar N, Bhatia S, Pateriya AK, Sood R, Nagarajan S, Murugkar HV, Kumar S, Singh P, Singh VP. Label-free peptide nucleic acid biosensor for visual detection of multiple strains of influenza A virus suitable for field applications. Anal Chim Acta 2019; 1093:123-130. [PMID: 31735205 DOI: 10.1016/j.aca.2019.09.060] [Citation(s) in RCA: 22] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/21/2019] [Revised: 09/21/2019] [Accepted: 09/23/2019] [Indexed: 01/10/2023]
Abstract
Accurate and rapid diagnosis of Influenza A viruses (IAVs) is challenging because of multiple strains circulating in humans and animal populations, and the emergence of new strains. In this study, we demonstrate a simple and rapid strategy for visual detection of multiple strains of IAVs (H1 to H16 subtypes) using peptide nucleic acid (PNA) as a biosensor and unmodified gold nanoparticles (AuNPs) as a reporter. The design principle of the assay is based on the color change on account of free PNA-induced aggregation of AuNPs in the presence of non-complementary viral RNA sequence and vice-versa. The assay could detect IAV RNA with a visual limit of detection of 2.3 ng. The quantification of RNA with a considerable accuracy on a simple spectrophotometer was achieved on plotting the PNA-induced colorimetric changes (absorption ratio of A640/A520) in the presence of a varying concentration of complementary RNA. As a proof-of-concept, the visual assay was validated on 419 avian clinical samples and receiver operating characteristic (ROC) curve analysis showed a high diagnostic specificity (96.46%, 95% CI = 93.8 to 98.2) and sensitivity (82.41%, 95% CI = 73.9 to 89.1) when RT-qPCR was used as reference test. Hence, the simplicity, rapidity, and universality of this strategy make it a potential candidate visual assay for clinical diagnosis and surveillance of IAVs, especially in the resource-limited settings. The proposed strategy establishes new avenues for developing a simple and rapid diagnostic system for viral infections and biomolecules.
Collapse
Affiliation(s)
- Naveen Kumar
- Diagnostics & Vaccines Section, ICAR-National Institute of High Security Animal Diseases, Bhopal, 462022, India.
| | - Sandeep Bhatia
- Diagnostics & Vaccines Section, ICAR-National Institute of High Security Animal Diseases, Bhopal, 462022, India
| | - Atul Kumar Pateriya
- Diagnostics & Vaccines Section, ICAR-National Institute of High Security Animal Diseases, Bhopal, 462022, India
| | - Richa Sood
- Diagnostics & Vaccines Section, ICAR-National Institute of High Security Animal Diseases, Bhopal, 462022, India
| | - S Nagarajan
- Avian Diseases Section, ICAR-National Institute of High Security Animal Diseases, Bhopal, 462022, India
| | - Harshad V Murugkar
- Avian Diseases Section, ICAR-National Institute of High Security Animal Diseases, Bhopal, 462022, India
| | - Satish Kumar
- Central Instrumentation Facility- Bioengineering, ICAR-Indian Veterinary Research Institute, Izatnagar, Bareilly, 243122, India
| | - Praveen Singh
- Central Instrumentation Facility- Bioengineering, ICAR-Indian Veterinary Research Institute, Izatnagar, Bareilly, 243122, India; Biophysics and Electron Microscopy Section, ICAR-Indian Veterinary Research Institute, Izatnagar, Bareilly, 243122, India
| | - Vijendra Pal Singh
- Diagnostics & Vaccines Section, ICAR-National Institute of High Security Animal Diseases, Bhopal, 462022, India
| |
Collapse
|
25
|
Muthukrishnan I, Vachan BS, Karuppasamy M, Eniyaval A, Uma Maheswari C, Nagarajan S, Menéndez JC, Sridharan V. Heterogeneous Amberlyst-15-catalyzed synthesis of complex hybrid heterocycles containing [1,6]-naphthyridine under metal-free green conditions. Org Biomol Chem 2019; 17:6872-6879. [PMID: 31268090 DOI: 10.1039/c9ob01256g] [Citation(s) in RCA: 13] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
An efficient green protocol for the synthesis of complex hybrid heterocycles containing [1,6]-naphthyridine and coumarin/pyrazole moieties was established, involving an intramolecular [4 + 2] hetero Diels-Alder reaction as the key step. The biologically significant 12,13-dihydro-6H-benzo[h]chromeno[3,4-b][1,6]naphthyridin-6-ones and 6,10-dihydro-5H-benzo[h]pyrazolo[3,4-b][1,6]naphthyridines were synthesized starting from 2-(N-propargylamino)-arylaldehydes and 3-aminocoumarins or 3-methyl-1-aryl-1H-pyrazol-5-amines in the presence of an Amberlyst-15 catalyst in PEG-200 in good yields. The easy access to diverse complex molecules in a single operation from readily available starting materials, a commercially available, transition metal-free and recyclable catalyst, the use of a green solvent, a very high atom economy and the release of water as the only side product are the highlights of this protocol.
Collapse
Affiliation(s)
- Isravel Muthukrishnan
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur-613401, Tamil Nadu, India
| | - B S Vachan
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur-613401, Tamil Nadu, India
| | - Muthu Karuppasamy
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur-613401, Tamil Nadu, India
| | - A Eniyaval
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur-613401, Tamil Nadu, India
| | - C Uma Maheswari
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur-613401, Tamil Nadu, India
| | - Subbiah Nagarajan
- Department of Chemistry, National Institute of Technology, Warangal, Warangal-506004, Telangana, India
| | - J Carlos Menéndez
- Unidad de Química Orgańica y Farmacéutica, Departamento de Química en Ciencias Farmacéuticas, Facultad de Farmacia, Universidad Complutense, 28040 Madrid, Spain
| | - Vellaisamy Sridharan
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur-613401, Tamil Nadu, India and Department of Chemistry and Chemical Sciences, Central University of Jammu, Rahya-Suchani (Bagla), District-Samba, Jammu-181143, J&K, India.
| |
Collapse
|
26
|
Karuppasamy M, Vachan BS, Vinoth P, Muthukrishnan I, Nagarajan S, Ielo L, Pace V, Banik S, Maheswari CU, Sridharan V. Direct Access to 9-Chloro-1H-benzo[b]furo[3,4-e]azepin-1-ones via Palladium(II)-Catalyzed Intramolecular syn-Oxypalladation/Olefin Insertion/sp2-C–H Bond Activation Cascade. Org Lett 2019; 21:5784-5788. [DOI: 10.1021/acs.orglett.9b01482] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Muthu Karuppasamy
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur 613401, Tamil Nadu, India
| | - B. S. Vachan
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur 613401, Tamil Nadu, India
| | - Perumal Vinoth
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur 613401, Tamil Nadu, India
| | - Isravel Muthukrishnan
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur 613401, Tamil Nadu, India
| | - Subbiah Nagarajan
- Department of Chemistry, National Institute of Technology, Warangal, Warangal 506004, Telangana, India
| | - Laura Ielo
- Department of Pharmaceutical Chemistry, University of Vienna, Althanstrasse 14, A-1090 Vienna, Austria
| | - Vittorio Pace
- Department of Pharmaceutical Chemistry, University of Vienna, Althanstrasse 14, A-1090 Vienna, Austria
| | - Subrata Banik
- Department of Chemistry and Chemical Sciences, Central University of Jammu, Rahya-Suchani
(Bagla), District-Samba, Jammu 181143, India
| | - C. Uma Maheswari
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur 613401, Tamil Nadu, India
| | - Vellaisamy Sridharan
- Department of Chemistry, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur 613401, Tamil Nadu, India
- Department of Chemistry and Chemical Sciences, Central University of Jammu, Rahya-Suchani
(Bagla), District-Samba, Jammu 181143, India
| |
Collapse
|
27
|
John G, Nagarajan S, Vemula PK, Silverman JR, Pillai C. Natural monomers: A mine for functional and sustainable materials – Occurrence, chemical modification and polymerization. Prog Polym Sci 2019. [DOI: 10.1016/j.progpolymsci.2019.02.008] [Citation(s) in RCA: 51] [Impact Index Per Article: 10.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
|
28
|
Vinoth P, Karuppasamy M, Vachan BS, Muthukrishnan I, Maheswari CU, Nagarajan S, Pace V, Roller A, Bhuvanesh N, Sridharan V. Palladium-Catalyzed Regioselective Syn-Chloropalladation-Olefin Insertion-Oxidative Chlorination Cascade: Synthesis of Dichlorinated Tetrahydroquinolines. Org Lett 2019; 21:3465-3469. [PMID: 31001984 DOI: 10.1021/acs.orglett.9b01295] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
Abstract
A palladium catalyzed cascade process involving syn-chloropalladation, intramolecular olefin insertion, and oxidative C-Cl bond formation reactions was demonstrated for the synthesis of dichlorinated tetrahydroquinolines in high yields (up to 93%). The N-propargyl arylamines having a tethered α,β-unsaturated carbonyl moiety underwent a regioselective syn-chloropalladation followed by a Heck-type reaction to deliver the tetrahydroquinoline scaffold. The rare insertion of the second chlorine atom was rationalized comprising a PdII/IV catalytic cycle and oxidative cleavage of the C-PdII bond.
Collapse
Affiliation(s)
- Perumal Vinoth
- Department of Chemistry, School of Chemical and Biotechnology , SASTRA Deemed University , Thanjavur - 613401 , Tamil Nadu India
| | - Muthu Karuppasamy
- Department of Chemistry, School of Chemical and Biotechnology , SASTRA Deemed University , Thanjavur - 613401 , Tamil Nadu India
| | - B S Vachan
- Department of Chemistry, School of Chemical and Biotechnology , SASTRA Deemed University , Thanjavur - 613401 , Tamil Nadu India
| | - Isravel Muthukrishnan
- Department of Chemistry, School of Chemical and Biotechnology , SASTRA Deemed University , Thanjavur - 613401 , Tamil Nadu India
| | - C Uma Maheswari
- Department of Chemistry, School of Chemical and Biotechnology , SASTRA Deemed University , Thanjavur - 613401 , Tamil Nadu India
| | - Subbiah Nagarajan
- Department of Chemistry , National Institute of Technology , Warangal, Warangal - 506004 , Telangana , India
| | - Vittorio Pace
- Department of Pharmaceutical Chemistry , University of Vienna , Althanstrasse 14 , A-1090 Vienna , Austria
| | - Alexander Roller
- Department of Pharmaceutical Chemistry , University of Vienna , Althanstrasse 14 , A-1090 Vienna , Austria
| | - Nattamai Bhuvanesh
- Department of Chemistry , Texas A & M University , College Station , Texas 77843 , United States
| | - Vellaisamy Sridharan
- Department of Chemistry, School of Chemical and Biotechnology , SASTRA Deemed University , Thanjavur - 613401 , Tamil Nadu India.,Department of Chemistry and Chemical Sciences , Central University of Jammu , Rahya-Suchani (Bagla), District-Samba, Jammu - 181143 , Jammu and Kashmir , India
| |
Collapse
|
29
|
Vivekanand T, Vachan BS, Karuppasamy M, Muthukrishnan I, Maheswari CU, Nagarajan S, Bhuvanesh N, Sridharan V. Diastereoselective ABB' Three-Component Synthesis of Highly Functionalized Spirooxindoles Bearing Five Consecutive Asymmetric Carbons. J Org Chem 2019; 84:4009-4016. [PMID: 30869516 DOI: 10.1021/acs.joc.8b03270] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/13/2022]
Abstract
The synthesis of spirooxindoles bearing tetrahydro-4 H-cyclopenta[ b]furan framework was established starting from isatin-derived aldehydes and 2 equiv of 1,3-dicarbonyl compounds involving a piperidine-catalyzed ABB' three-component domino process. This reaction was highly diastereoselective affording a single diastereomer of spirooxindoles with five consecutive asymmetric carbons including spiro and tetrasubstituted carbon centers. In addition, this waste-free (-2H2O) reaction showed high atom economy and step economy by creating four new bonds, including three C-C bonds and one C-O bond, and two rings (one carbo- and one heterocyclic) in a single operation. The mechanism of this three-component domino process involved sequential Knoevenagel condensation-Michael addition-intramolecular oxa-Michael addition-intramolecular aldol reactions.
Collapse
Affiliation(s)
- Thavaraj Vivekanand
- Department of Chemistry, School of Chemical and Biotechnology , SASTRA Deemed University , Thanjavur 613401 , Tamil Nadu , India
| | - B S Vachan
- Department of Chemistry, School of Chemical and Biotechnology , SASTRA Deemed University , Thanjavur 613401 , Tamil Nadu , India
| | - Muthu Karuppasamy
- Department of Chemistry, School of Chemical and Biotechnology , SASTRA Deemed University , Thanjavur 613401 , Tamil Nadu , India
| | - Isravel Muthukrishnan
- Department of Chemistry, School of Chemical and Biotechnology , SASTRA Deemed University , Thanjavur 613401 , Tamil Nadu , India
| | - C Uma Maheswari
- Department of Chemistry, School of Chemical and Biotechnology , SASTRA Deemed University , Thanjavur 613401 , Tamil Nadu , India
| | - Subbiah Nagarajan
- Department of Chemistry , National Institute of Technology , Warangal 506004 , Telangana , India
| | - Nattamai Bhuvanesh
- Department of Chemistry , Texas A & M University , College Station , Texas 77843 , United States
| | - Vellaisamy Sridharan
- Department of Chemistry, School of Chemical and Biotechnology , SASTRA Deemed University , Thanjavur 613401 , Tamil Nadu , India.,Department of Chemistry and Chemical Sciences , Central University of Jammu , Rahya-Suchani (Bagla) , Samba-District, Jammu 181143 , J&K , India
| |
Collapse
|
30
|
Meenakshisundaram S, Gopalakrishnan M, Nagarajan S, Sarathi N, Sumathi P. Kinetics and mechanism of the oxidation of alkenes by chromium(VI) in the presence of complexing agents. Journal of Chemical Research 2019. [DOI: 10.3184/0308234054497173] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
Abstract
The catalytic activities of 2,2′-bipyridyl (bipy) and oxalic acid (Oxa) in the HCrO4– oxidation of some substituted trans-cinnamic acids have been investigated in acidic solutions. The Cr(VI)–bipy and Cr(VI)–Oxa complexes are believed to be the probable reactive electrophiles in this redox process. The kinetic data reveal that electron-releasing groups enhance the reactivity to a significant extent while the electron-withdrawing ones reduce the rate marginally. It appears that the mechanism of bipy/Oxa catalysed chromium(VI) oxidation of unsaturated systems to the corresponding cleavage products involves an electrophilic attack of the reactive complex at the C–C double bond. The formation of a ternary complex as an intermediate is envisaged to describe the redox process. In this paper, we also report on the kinetic form of the oxidation of trans-stilbene to methyl 3-hydroxy-2,3-diphenylpropanoate. The mechanistic pathway has been determined based on the kinetic behaviour and the product assignment.
Collapse
Affiliation(s)
| | - M. Gopalakrishnan
- Department of Chemistry, Annamalai University, Annamalainagar – 608 002, India
| | - S. Nagarajan
- Department of Chemistry, Annamalai University, Annamalainagar – 608 002, India
| | - N. Sarathi
- Department of Chemistry, Annamalai University, Annamalainagar – 608 002, India
| | - P. Sumathi
- Department of Chemistry, Annamalai University, Annamalainagar – 608 002, India
| |
Collapse
|
31
|
|
32
|
Thamizhanban A, Lalitha K, Sarvepalli GP, Maheswari CU, Sridharan V, Rayappan JBB, Nagarajan S. Smart supramolecular gels of enolizable amphiphilic glycosylfuran. J Mater Chem B 2019; 7:6238-6246. [DOI: 10.1039/c9tb01480b] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/17/2022]
Abstract
In this report, bio-based amphiphilic glycosylfurans were synthesized using a biocatalyst. For the first time, we are reporting on hydrogelation via in situ molecular tuning of amphiphilic glycosylfurans followed by a self-sorting mechanism.
Collapse
Affiliation(s)
- Ayyapillai Thamizhanban
- Department of Chemistry
- School of Chemical and Biotechnology
- SASTRA Deemed University
- Thanjavur – 613401
- India
| | - Krishnamoorthy Lalitha
- Department of Chemistry
- School of Chemical and Biotechnology
- SASTRA Deemed University
- Thanjavur – 613401
- India
| | - Guru Prasanth Sarvepalli
- Department of Chemistry
- School of Chemical and Biotechnology
- SASTRA Deemed University
- Thanjavur – 613401
- India
| | - C. Uma Maheswari
- Department of Chemistry
- School of Chemical and Biotechnology
- SASTRA Deemed University
- Thanjavur – 613401
- India
| | - Vellaisamy Sridharan
- Department of Chemistry and Chemical Sciences
- Central University of Jammu
- Rahya-Suchani (Bagla)
- Jammu – 181143
- India
| | | | - Subbiah Nagarajan
- Department of Chemistry
- School of Chemical and Biotechnology
- SASTRA Deemed University
- Thanjavur – 613401
- India
| |
Collapse
|
33
|
Manian DV, Nagarajan S, Vastardi M. CLINICAL PREDICTORS OF OBESITY AND ALLERGIC RHINITIS SEASONALITY IN AN INNER-CITY PEDIATRIC COHORT. Ann Allergy Asthma Immunol 2018. [DOI: 10.1016/j.anai.2018.09.206] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
|
34
|
Muthusamy K, Lalitha K, Prasad YS, Thamizhanban A, Sridharan V, Maheswari CU, Nagarajan S. Lipase-Catalyzed Synthesis of Furan-Based Oligoesters and their Self-Assembly-Assisted Polymerization. ChemSusChem 2018; 11:2453-2463. [PMID: 29750850 DOI: 10.1002/cssc.201800446] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/05/2018] [Indexed: 06/08/2023]
Abstract
We investigate the synthesis of bio-based hydrophilic and hydrophobic oligoesters, which in turn are derived from easily accessible monomers from natural resources. In addition to the selection of renewable monomers, Novozyme 435, an immobilized lipase B from Candida antarctica was used for the oligomerization of monomers. The reaction conditions for oligomerization using Novozyme 435 were established to obtain a moderate-to-good yield. The average number of repeating units and the molecular weight distribution of hydrophilic and hydrophobic oligoester were identified by using NMR spectroscopy, gel-permeation chromatography, and MS. The oligoester derived from a hydrophilic monomer self-assembled to form a viscous solution, which upon further heating resulted in the formation of a polymer by the intermolecular Diels-Alder reaction. The viscosity of the solution and the assembly of oligoester to form a fibrous structure were investigated by using rheological studies, XRD, and SEM. The molecular weight of the cross-linked polymer was identified by using matrix-assisted laser desorption/ionization-MS. The thermal properties of the bio-based polymers were investigated by using thermogravimetric analysis and differential scanning calorimetry. For the first time, the self-assembly-assisted polymerization of an oligoester is reported using the intermolecular Diels-Alder reaction, which opens a new avenue in the field of polymer science.
Collapse
Affiliation(s)
- Kumarasamy Muthusamy
- Organic Synthesis Group, Department of Chemistry & The Centre for Nanotechnology and Advanced Biomaterials, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur-, 613401, India
| | - Krishnamoorthy Lalitha
- Organic Synthesis Group, Department of Chemistry & The Centre for Nanotechnology and Advanced Biomaterials, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur-, 613401, India
| | - Yadavali Siva Prasad
- Organic Synthesis Group, Department of Chemistry & The Centre for Nanotechnology and Advanced Biomaterials, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur-, 613401, India
| | - Ayyapillai Thamizhanban
- Organic Synthesis Group, Department of Chemistry & The Centre for Nanotechnology and Advanced Biomaterials, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur-, 613401, India
| | - Vellaisamy Sridharan
- Organic Synthesis Group, Department of Chemistry & The Centre for Nanotechnology and Advanced Biomaterials, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur-, 613401, India
- Department of Chemistry and Chemical Sciences, Central University of Jammu, Rahya-Suchani (Bagla), District-Samba, Jammu-, 181143, Jammu and Kashmir, India
| | - C Uma Maheswari
- Organic Synthesis Group, Department of Chemistry & The Centre for Nanotechnology and Advanced Biomaterials, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur-, 613401, India
| | - Subbiah Nagarajan
- Organic Synthesis Group, Department of Chemistry & The Centre for Nanotechnology and Advanced Biomaterials, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur-, 613401, India
- Department of Chemistry, National Institute of Technology, Warangal, Warangal-, 506004, Telangana, India
| |
Collapse
|
35
|
Lowrence RC, Ramakrishnan A, Sundaramoorthy NS, Shyam A, Mohan V, Subbarao HMV, Ulaganathan V, Raman T, Solomon A, Nagarajan S. Norfloxacin salts of carboxylic acids curtail planktonic and biofilm mode of growth in ESKAPE pathogens. J Appl Microbiol 2018; 124:408-422. [PMID: 29178633 DOI: 10.1111/jam.13651] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/17/2017] [Revised: 09/14/2017] [Accepted: 11/17/2017] [Indexed: 12/19/2022]
Abstract
AIMS To enhance the antimicrobial and antibiofilm activity of norfloxacin against the planktonic and biofilm mode of growth in ESKAPE pathogens using chemically modified norfloxacin salts. METHODS AND RESULTS Antimicrobial testing, synergy testing and time-kill curve analysis were performed to evaluate antibacterial effect of norfloxacin carboxylic acid salts against ESKAPE pathogens. In vivo efficacy to reduce bacterial bioburden was evaluated in zebrafish infection model. Crystal violet assay and live-dead staining were performed to discern antibiofilm effect. Membrane permeability, integrity and molecular docking studies were carried out to ascertain the mechanism of action. The carboxylic acid salts, relative to parent molecule norfloxacin, displayed two- to fourfold reduction in minimum inhibitory concentration against Staphylococcus aureus and Pseudomonas aeruginosa, in addition to displaying potent bacteriostatic effect against certain members of ESKAPE pathogens. In vivo treatments revealed that norfloxacin tartrate (SRIN2) reduced MRSA bioburden by greater than 1 log fold relative to parent molecule in the muscle tissue. In silico docking with gyrA of S. aureus showed increased affinity of SRIN2 towards DNA gyrase. The enhanced antibacterial effect of norfloxacin salts could be partially accounted by altered membrane permeability in S. aureus and perturbed membrane integrity in P. aeruginosa. Antibiofilm studies revealed that SRIN2 (norfloxacin tartrate) and SRIN3 (norfloxacin benzoate) exerted potent antibiofilm effect particularly against Gram-negative ESKAPE pathogens. The impaired colonization of both S. aureus and P. aeruginosa due to improved norfloxacin salts was further supported by live-dead imaging. CONCLUSION Norfloxacin carboxylic acid salts can act as potential alternatives in terms of drug resensitization and reuse. SIGNIFICANCE AND IMPACT OF THE STUDY Our study shows that carboxylic acid salts of norfloxacin could be effectively employed to treat both planktonic- and biofilm-based infections caused by select members of ESKAPE pathogens.
Collapse
Affiliation(s)
- R C Lowrence
- School of Chemical and Biotechnology, SASTRA University, Thanjavur, Tamil Nadu, India.,Center for Research on Infectious Diseases (CRID), School of Chemical and Biotechnology, SASTRA University, Thanjavur, Tamil Nadu, India
| | - A Ramakrishnan
- School of Chemical and Biotechnology, SASTRA University, Thanjavur, Tamil Nadu, India
| | - N S Sundaramoorthy
- School of Chemical and Biotechnology, SASTRA University, Thanjavur, Tamil Nadu, India
| | - A Shyam
- School of Chemical and Biotechnology, SASTRA University, Thanjavur, Tamil Nadu, India
| | - V Mohan
- School of Chemical and Biotechnology, SASTRA University, Thanjavur, Tamil Nadu, India
| | - H M V Subbarao
- School of Chemical and Biotechnology, SASTRA University, Thanjavur, Tamil Nadu, India
| | - V Ulaganathan
- School of Chemical and Biotechnology, SASTRA University, Thanjavur, Tamil Nadu, India
| | - T Raman
- School of Chemical and Biotechnology, SASTRA University, Thanjavur, Tamil Nadu, India
| | - A Solomon
- Department of Chemistry, School of Engineering, Dayananda Sagar University, Bangalore, Karnataka, India
| | - S Nagarajan
- School of Chemical and Biotechnology, SASTRA University, Thanjavur, Tamil Nadu, India.,Center for Research on Infectious Diseases (CRID), School of Chemical and Biotechnology, SASTRA University, Thanjavur, Tamil Nadu, India
| |
Collapse
|
36
|
Lalitha K, Sridharan V, Maheswari CU, Vemula PK, Nagarajan S. Morphology transition in helical tubules of a supramolecular gel driven by metal ions. Chem Commun (Camb) 2018; 53:1538-1541. [PMID: 28094356 DOI: 10.1039/c6cc09120b] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
Abstract
Our aim to access a particular chemical functionality on helical tubules has been achieved by the rational molecular design and synthesis of glucono-appended cardanol derivatives. For the first time, we report a chiral molecular packing with α-helical tubules, and chiral symmetry-breaking upon exposure to Cu2+ that generated the final ordered structure via an in situ morphological transition without undergoing any phase change.
Collapse
Affiliation(s)
- Krishnamoorthy Lalitha
- Organic Synthesis Group, Department of Chemistry & The Centre for Nanotechnology and Advanced Biomaterials, School of Chemical and Biotechnology, SASTRA University, Thanjavur-613401, Tamil Nadu, India.
| | - Vellaisamy Sridharan
- Organic Synthesis Group, Department of Chemistry & The Centre for Nanotechnology and Advanced Biomaterials, School of Chemical and Biotechnology, SASTRA University, Thanjavur-613401, Tamil Nadu, India.
| | - C Uma Maheswari
- Organic Synthesis Group, Department of Chemistry & The Centre for Nanotechnology and Advanced Biomaterials, School of Chemical and Biotechnology, SASTRA University, Thanjavur-613401, Tamil Nadu, India.
| | - Praveen Kumar Vemula
- Laboratory of Self-Assembled Biomaterials, Institute for Stem Cell Biology and Regenerative Medicine (inStem), National Centre for Biological Sciences (NCBS), Bangalore-560 065, Karnataka, India
| | - Subbiah Nagarajan
- Organic Synthesis Group, Department of Chemistry & The Centre for Nanotechnology and Advanced Biomaterials, School of Chemical and Biotechnology, SASTRA University, Thanjavur-613401, Tamil Nadu, India.
| |
Collapse
|
37
|
Prasad YS, Saritha B, Tamizhanban A, Lalitha K, Kabilan S, Maheswari CU, Sridharan V, Nagarajan S. Enzymatic synthesis and self-assembly of glycolipids: robust self-healing and wound closure performance of assembled soft materials. RSC Adv 2018; 8:37136-37145. [PMID: 35557831 PMCID: PMC9089313 DOI: 10.1039/c8ra07703g] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2018] [Accepted: 10/22/2018] [Indexed: 11/21/2022] Open
Abstract
In developing countries, wounds are a major health concern and pose a significant problem. Hence, the development of new materials that can act as scaffolds for in situ tissue regeneration and regrowth is necessary. In this report, we present a new class of injectable oleogel and composite gel derived from glycolipids that provide reversible interlinked 3D fiberous network architecture for effective wound closure by tissue regrowth and regeneration. Glycolipids were derived from α-chloralose and various vinyl esters using Novozyme 435, an immobilized lipase B from Candida antarctica as a catalyst, in good yield. These glycolipids undergo spontaneous self-assembly in paraffin oil to form an oleogel, in which curcumin was successfully incorporated to generate a composite gel. Morphological analysis of the oleogel and composite gel clearly revealed the formation of a 3D fiberous network. Rheological investigation revealed the thermal and mechanical processability of the oleogel and composite gel under various experimental conditions. Interestingly, the developed injectable oleogel and composite gel are able to accelerate the wound healing process by regulating the overlapping phases of inflammation, cell proliferation and extracellular matrix remodelling. Since chloralose displays anesthetic properties, this study will establish a new strategy to develop anesthetic wound healing oleogels in the future. In this report, we present a new class of injectable oleogels and a composite gel derived from glycolipids that provide a reversible interlinked 3D fiberous network architecture for effective wound closure by tissue regrowth and regeneration.![]()
Collapse
Affiliation(s)
- Yadavali Siva Prasad
- Department of Chemistry
- School of Chemical and Biotechnology
- SASTRA Deemed University
- Thanjavur – 613401
- India
| | - Balasubramani Saritha
- Department of Chemistry
- School of Chemical and Biotechnology
- SASTRA Deemed University
- Thanjavur – 613401
- India
| | - Ayyapillai Tamizhanban
- Department of Chemistry
- School of Chemical and Biotechnology
- SASTRA Deemed University
- Thanjavur – 613401
- India
| | - Krishnamoorthy Lalitha
- Department of Chemistry
- School of Chemical and Biotechnology
- SASTRA Deemed University
- Thanjavur – 613401
- India
| | - Sakthivel Kabilan
- Department of Chemistry
- School of Chemical and Biotechnology
- SASTRA Deemed University
- Thanjavur – 613401
- India
| | - C. Uma Maheswari
- Department of Chemistry
- School of Chemical and Biotechnology
- SASTRA Deemed University
- Thanjavur – 613401
- India
| | - Vellaisamy Sridharan
- Department of Chemistry and Chemical Sciences
- Central University of Jammu
- Rahya-Suchani (Bagla)
- Jammu-181143
- India
| | - Subbiah Nagarajan
- Department of Chemistry
- School of Chemical and Biotechnology
- SASTRA Deemed University
- Thanjavur – 613401
- India
| |
Collapse
|
38
|
Khurshid F, Jeyavelan M, Takahashi K, Leo Hudson MS, Nagarajan S. Aryl fluoride functionalized graphene oxides for excellent room temperature ammonia sensitivity/selectivity. RSC Adv 2018; 8:20440-20449. [PMID: 35541670 PMCID: PMC9080835 DOI: 10.1039/c8ra01818a] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/01/2018] [Accepted: 05/29/2018] [Indexed: 11/21/2022] Open
Abstract
Herein, we report the covalent functionalization of graphene oxide (GO) through ‘‘click’’ reaction and its applications towards ammonia sensing. This inimitable method of covalent functionalization involves linking GO with azide moiety and click coupling of different derivatives of aryl propargyl ether, which enhances the sensitivity towards ammonia. The functionalized GO were characterized using NMR, XRD, SEM, FT-IR, Raman, UV-Vis, TGA and DSC. Compared to pristine GO, the GO functionalized with Ar samples (GO-Ar) exhibit excellent room temperature ammonia sensing properties with good response/recovery characteristics. It has been observed that 2,3-difluoro and 2,3,4-trifluoro substituted aryl propargyl ether functionalized GO (GO-Ar2 and GO-Ar3) shows superior ammonia sensing with response/recovery of 63%/∼90% and 60%/100%, respectively at 20 ppm. The GO-Ar3 exhibits high sensitivity towards ammonia at 20–100 ppm. Computational studies supports the high sensitivity of GO-Ar towards ammonia due to its high adsorption energy. Covalent functionalization of graphene oxide (GO) through ‘‘click’’ reaction and its applications towards ammonia sensing has been demonstrated.![]()
Collapse
Affiliation(s)
| | - M. Jeyavelan
- Department of Physics
- Central University of Tamil Nadu
- India
| | - Keisuke Takahashi
- Center for Materials Research By Information Integration (CMI2)
- National Institute for Materials Science (NIMS)
- Tsukuba
- Japan
| | | | - S. Nagarajan
- Department of Chemistry
- Central University of Tamil Nadu
- India
| |
Collapse
|
39
|
Lalitha K, Gayathri K, Prasad YS, Saritha R, Thamizhanban A, Maheswari CU, Sridharan V, Nagarajan S. Supramolecular Gel Formation Based on Glycolipids Derived from Renewable Resources. Gels 2017; 4:E1. [PMID: 30674777 PMCID: PMC6318777 DOI: 10.3390/gels4010001] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/05/2017] [Revised: 12/21/2017] [Accepted: 12/22/2017] [Indexed: 12/25/2022] Open
Abstract
The potential applications of self-assembled supramolecular gels based on natural molecules encouraged the researchers to develop a versatile synthetic method for their structural analogues. Herein, we report a facile synthesis of glycolipid from renewable resources, cashew nut shell liquid,d and d-glucose in good yield. Gelation behavior of these glycolipids were studied in a wide range of solvents and oils. To our delight, compound 5b formed a hydrogel with Critical gelator concentration (CGC) of 0.29% w/v. Morphological analysis of the hydrogel depicts the formation of twisted fibers with an entangled network. Formation of a twisted fibrous structure was further identified by CD spectral studies with respect to temperature. The molecular self-assembly assisted by hydrogen bonding, hydrophobic, and π⁻π stacking interactions were identified by X-ray diffraction (XRD) and FTIR studies. Rheological analysis depicted the mechanical strength and stability of the hydrogel, which is crucial in predicting the practical applications of supramolecular soft materials.
Collapse
Affiliation(s)
- Krishnamoorthy Lalitha
- Organic Synthesis Group, Department of Chemistry and CeNTAB, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur-613401, Tamil Nadu, India.
| | - Kandasamy Gayathri
- Organic Synthesis Group, Department of Chemistry and CeNTAB, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur-613401, Tamil Nadu, India.
| | - Yadavali Siva Prasad
- Organic Synthesis Group, Department of Chemistry and CeNTAB, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur-613401, Tamil Nadu, India.
| | - Rajendhiran Saritha
- Organic Synthesis Group, Department of Chemistry and CeNTAB, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur-613401, Tamil Nadu, India.
| | - A Thamizhanban
- Organic Synthesis Group, Department of Chemistry and CeNTAB, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur-613401, Tamil Nadu, India.
| | - C Uma Maheswari
- Organic Synthesis Group, Department of Chemistry and CeNTAB, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur-613401, Tamil Nadu, India.
| | - Vellaisamy Sridharan
- Organic Synthesis Group, Department of Chemistry and CeNTAB, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur-613401, Tamil Nadu, India.
- Department of Chemistry and Chemical Sciences, Central University of Jammu, Rahya-Suchani (Bagla), District-Samba, Jammu-181143, Jammu and Kashmir, India.
| | - Subbiah Nagarajan
- Organic Synthesis Group, Department of Chemistry and CeNTAB, School of Chemical and Biotechnology, SASTRA Deemed University, Thanjavur-613401, Tamil Nadu, India.
| |
Collapse
|
40
|
Muthusamy K, Chinnasamy S, Nagarajan S, Sivaraman T. Computational and in vitro insights on snake venom phospholipase A2 inhibitor of phytocompound ikshusterol3-O-glucoside of Clematis gouriana Roxb. ex DC. J Biomol Struct Dyn 2017; 36:4197-4208. [DOI: 10.1080/07391102.2017.1409653] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Karthikeyan Muthusamy
- Department of Bioinformatics, Alagappa University, Karaikudi 630 004, Tamil Nadu, India
| | | | - Subbiah Nagarajan
- Department of Chemistry, Sastra University, Thanjavur 613401, Tamil Nadu, India
| | - Thirunavukkarasu Sivaraman
- Department of Biotechnology, Karpagam Academy of Higher Education (Karpagam University), Coimbatore 641021, Tamil Nadu, India
| |
Collapse
|
41
|
Prasad YS, Miryala S, Lalitha K, Ranjitha K, Barbhaiwala S, Sridharan V, Maheswari CU, Srinandan CS, Nagarajan S. Disassembly of Bacterial Biofilms by the Self-Assembled Glycolipids Derived from Renewable Resources. ACS Appl Mater Interfaces 2017; 9:40047-40058. [PMID: 29096062 DOI: 10.1021/acsami.7b12225] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
More than 80% of chronic infections of bacteria are caused by biofilms. It is also a long-term survival strategy of the pathogens in a nonhost environment. Several amphiphilic molecules have been used in the past to potentially disrupt biofilms; however, the involvement of multistep synthesis, complicated purification and poor yield still remains a major problem. Herein, we report a facile synthesis of glycolipid based surfactant from renewable feedstocks in good yield. The nature of carbohydrate unit present in glycolipid influence the ring chain tautomerism, which resulted in the existence of either cyclic structure or both cyclic and acyclic structures. Interestingly, these glycolipids self-assemble into gel in highly hydrophobic solvents and vegetable oils, and displayed foam formation in water. The potential application of these self-assembled glycolipids to disrupt preformed biofilm was examined against various pathogens. It was observed that glycolipid 6a disrupts Staphylococcus aureus and Listeria monocytogenes biofilm, while the compound 6c was effective in disassembling uropathogenic E. coli and Salmonella enterica Typhimurium biofilms. Altogether, the supramolecular self-assembled materials, either as gel or as surfactant solution could be potentially used for surface cleansing in hospital environments or the food processing industries to effectively reduce pathogenic biofilms.
Collapse
Affiliation(s)
- Yadavali Siva Prasad
- Organic Synthesis Group, Department of Chemistry and CeNTAB, School of Chemical and Biotechnology, SASTRA University , Thanjavur-613401, Tamil Nadu, India
| | - Sandeep Miryala
- Biofilm Biology Lab, Centre for Research in Infectious Diseases, School of Chemical and Biotechnology, SASTRA University , Thanjavur-613401, Tamil Nadu, India
| | - Krishnamoorthy Lalitha
- Organic Synthesis Group, Department of Chemistry and CeNTAB, School of Chemical and Biotechnology, SASTRA University , Thanjavur-613401, Tamil Nadu, India
| | - K Ranjitha
- Organic Synthesis Group, Department of Chemistry and CeNTAB, School of Chemical and Biotechnology, SASTRA University , Thanjavur-613401, Tamil Nadu, India
| | - Shehnaz Barbhaiwala
- Biofilm Biology Lab, Centre for Research in Infectious Diseases, School of Chemical and Biotechnology, SASTRA University , Thanjavur-613401, Tamil Nadu, India
| | - Vellaisamy Sridharan
- Organic Synthesis Group, Department of Chemistry and CeNTAB, School of Chemical and Biotechnology, SASTRA University , Thanjavur-613401, Tamil Nadu, India
| | - C Uma Maheswari
- Organic Synthesis Group, Department of Chemistry and CeNTAB, School of Chemical and Biotechnology, SASTRA University , Thanjavur-613401, Tamil Nadu, India
| | - C S Srinandan
- Biofilm Biology Lab, Centre for Research in Infectious Diseases, School of Chemical and Biotechnology, SASTRA University , Thanjavur-613401, Tamil Nadu, India
| | - Subbiah Nagarajan
- Organic Synthesis Group, Department of Chemistry and CeNTAB, School of Chemical and Biotechnology, SASTRA University , Thanjavur-613401, Tamil Nadu, India
| |
Collapse
|
42
|
Pathak AP, Murugkar HV, Nagarajan S, Sood R, Tosh C, Kumar M, Athira CK, Praveen A. Survivability of low pathogenic (H9N2) avian influenza virus in water in the presence of Atyopsis moluccensis (Bamboo shrimp). Zoonoses Public Health 2017; 65:e124-e129. [PMID: 29115743 DOI: 10.1111/zph.12420] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/06/2017] [Indexed: 11/30/2022]
Abstract
Low pathogenic avian influenza virus (LPAIV) exhibits an ecological climax with the aquatic ecosystem. The most widely prevalent subtype of LPAIV is H9N2. Wild aquatic birds being the natural reservoirs and ducks, the "Trojan horses" for Avian Influenza Virus (AIV), can contaminate the natural water bodies inhabited by them. The virus can persist in the contaminated water from days to years depending upon the environmental conditions. Various aquatic species other than ducks can promote the persistence and transmission of AIV; however, studies on the role of aquatic fauna in persistence and transmission of avian influenza virus are scarce. This experiment was designed to evaluate the survivability of H9N2 LPAIV in water with and without Atyopsis moluccensis (bamboo shrimp) for a period of 12 days. The infectivity and amount of virus in water were calculated and were found to be significantly higher in water with A. moluccensis than in water without A. moluccensis. The study also showed that A. moluccensis can accumulate the virus mechanically which can infect chicken eggs up to 11 days. The virus transmission potential of A. moluccensis requires further studies.
Collapse
Affiliation(s)
- A P Pathak
- Department of Veterinary Public Health and Epidemiology, G. B. Pant University of Agriculture and Technology, Pantnagar, Uttarakhand, India
| | - H V Murugkar
- Indian Council of Agricultural Research- National Institute of High Security Animal Diseases (ICAR-NIHSAD), Bhopal, Madhya Pradesh, India
| | - S Nagarajan
- Indian Council of Agricultural Research- National Institute of High Security Animal Diseases (ICAR-NIHSAD), Bhopal, Madhya Pradesh, India
| | - R Sood
- Indian Council of Agricultural Research- National Institute of High Security Animal Diseases (ICAR-NIHSAD), Bhopal, Madhya Pradesh, India
| | - C Tosh
- Indian Council of Agricultural Research- National Institute of High Security Animal Diseases (ICAR-NIHSAD), Bhopal, Madhya Pradesh, India
| | - M Kumar
- Indian Council of Agricultural Research- National Institute of High Security Animal Diseases (ICAR-NIHSAD), Bhopal, Madhya Pradesh, India
| | - C K Athira
- Division of Veterinary Public Health, Indian Veterinary Research Institute, Bareilly, Uttar Pradesh, India
| | - A Praveen
- Veterinary Dispensary, Korukollu, Krishna District, Andhra Pradesh, India
| |
Collapse
|
43
|
Vasudevan G, Vanamayya PR, Nagarajan S, Rajukumar K, Suba S, Venketash G, Tosh C, Sood R, Nissly RH, Kuchipudi SV. Infectious dose-dependent accumulation of live highly pathogenic avian influenza H5N1 virus in chicken skeletal muscle-implications for public health. Zoonoses Public Health 2017; 65:e243-e247. [PMID: 28941132 DOI: 10.1111/zph.12406] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/22/2017] [Indexed: 11/27/2022]
Abstract
Highly pathogenic avian influenza viruses (HPAIV) of H5N1 subtype are a major global threat to poultry and public health. Export of poultry products, such as chicken and duck meat, is a known source for the cross-boundary spread of HPAI H5N1 viruses. Humans get infected with HPAI H5N1 viruses either by close contact with infected poultry or through consumption of fresh/undercooked poultry meat. Skeletal muscle is the largest soft tissue in chicken that has been shown to contain virus during systemic HPAIV infection and supports productive virus infection. However, the time between infection of a chicken with H5N1 virus and presence of virus in muscle tissue is not yet known. Further, it is also not clear whether chicken infected with low doses of H5N1 virus that cause non-fatal subclinical infections continue to accumulate virus in skeletal muscle. We investigated the amount and duration of virus detection in skeletal muscle of chicken experimentally infected with different doses (102 , 103 and 104 EID50 ) of a HPAI H5N1 virus. Influenza viral antigen could be detected as early as 6 hr after infection and live virus was recovered from 48 hr after infection. Notably, chicken infected with lower levels of HPAI H5N1 virus (i.e., 102 EID50 ) did not die acutely, but continued to accumulate high levels of H5N1 virus in skeletal muscle until 6 days post-infection. Our data suggest that there is a potential risk of human exposure to H5N1 virus through meat from clinically healthy chicken infected with a low dose of virus. Our results highlight the need to implement rigorous monitoring systems to screen poultry meat from H5N1 endemic countries to limit the global spread of H5N1 viruses.
Collapse
Affiliation(s)
- G Vasudevan
- National Institute of High Security Animal Diseases, Bhopal, Madhya Pradesh, India.,Poultry Disease Diagnosis and Surveillance Laboratory, Veterinary College and Research Institute Campus, Tamil Nadu Veterinary and Animal Sciences University, Namakkal, Tamil Nadu, India
| | - P R Vanamayya
- National Institute of High Security Animal Diseases, Bhopal, Madhya Pradesh, India
| | - S Nagarajan
- National Institute of High Security Animal Diseases, Bhopal, Madhya Pradesh, India
| | - K Rajukumar
- National Institute of High Security Animal Diseases, Bhopal, Madhya Pradesh, India
| | - S Suba
- National Institute of High Security Animal Diseases, Bhopal, Madhya Pradesh, India
| | - G Venketash
- National Institute of High Security Animal Diseases, Bhopal, Madhya Pradesh, India
| | - C Tosh
- National Institute of High Security Animal Diseases, Bhopal, Madhya Pradesh, India
| | - R Sood
- National Institute of High Security Animal Diseases, Bhopal, Madhya Pradesh, India
| | - R H Nissly
- Animal Diagnostic Laboratory, Department of Veterinary and Biomedical Sciences, The Pennsylvania State University, University Park, PA, USA
| | - S V Kuchipudi
- Animal Diagnostic Laboratory, Department of Veterinary and Biomedical Sciences, The Pennsylvania State University, University Park, PA, USA
| |
Collapse
|
44
|
Naresh-Kumar G, Vilalta-Clemente A, Jussila H, Winkelmann A, Nolze G, Vespucci S, Nagarajan S, Wilkinson AJ, Trager-Cowan C. Quantitative imaging of anti-phase domains by polarity sensitive orientation mapping using electron backscatter diffraction. Sci Rep 2017; 7:10916. [PMID: 28883500 PMCID: PMC5589861 DOI: 10.1038/s41598-017-11187-z] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/21/2017] [Accepted: 08/14/2017] [Indexed: 11/16/2022] Open
Abstract
Advanced structural characterisation techniques which are rapid to use, non-destructive and structurally definitive on the nanoscale are in demand, especially for a detailed understanding of extended-defects and their influence on the properties of materials. We have applied the electron backscatter diffraction (EBSD) technique in a scanning electron microscope to non-destructively characterise and quantify antiphase domains (APDs) in GaP thin films grown on different (001) Si substrates with different offcuts. We were able to image and quantify APDs by relating the asymmetrical intensity distributions observed in the EBSD patterns acquired experimentally and comparing the same with the dynamical electron diffraction simulations. Additionally mean angular error maps were also plotted using automated cross-correlation based approaches to image APDs. Samples grown on substrates with a 4° offcut from the [110] do not show any APDs, whereas samples grown on the exactly oriented substrates contain APDs. The procedures described in our work can be adopted for characterising a wide range of other material systems possessing non-centrosymmetric point groups.
Collapse
Affiliation(s)
- G Naresh-Kumar
- Department of Physics, SUPA, University of Strathclyde, Glasgow, G4 ONG, UK.
| | - A Vilalta-Clemente
- Department of Materials, University of Oxford, Parks Road, Oxford, OX1 3PH, UK
| | - H Jussila
- Department of Electronics and Nanoengineering, Aalto University, FI-00076, Aalto, Finland
| | - A Winkelmann
- Bruker Nano GmbH, Am Studio 2D, 12489, Berlin, Germany
| | - G Nolze
- BAM, Federal Institute for Materials Research and Testing, Unter den Eichen 87, 12205, Berlin, Germany
| | - S Vespucci
- Department of Physics, SUPA, University of Strathclyde, Glasgow, G4 ONG, UK
| | - S Nagarajan
- Department of Electronics and Nanoengineering, Aalto University, FI-00076, Aalto, Finland
| | - A J Wilkinson
- Department of Materials, University of Oxford, Parks Road, Oxford, OX1 3PH, UK
| | - C Trager-Cowan
- Department of Physics, SUPA, University of Strathclyde, Glasgow, G4 ONG, UK
| |
Collapse
|
45
|
Iyer L, Noack C, Nagarajan S, Woelfer M, Schoger E, Pang S, Kari V, Zafeiriou M, Toischer K, Hasenfuss G, Johnsen S, Zelarayan L. P4479B-catenin/TCF7L2 signaling orchestrates initiation of pathological hypertrophic cardiac remodeling by inducing chromatin modifications. Eur Heart J 2017. [DOI: 10.1093/eurheartj/ehx504.p4479] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
|
46
|
Alanthadka A, Devi ES, Selvi AT, Nagarajan S, Sridharan V, Maheswari CU. N-Heterocyclic Carbene-Catalyzed Mannich Reaction for the Synthesis of β-Amino Ketones: N
,N
-Dimethylformamide as Carbon Source. Adv Synth Catal 2017. [DOI: 10.1002/adsc.201700125] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Anitha Alanthadka
- Organic Synthesis Group, Department of Chemistry; School of Chemical and Biotechnology; SASTRA University; Thanjavur 613401 India
| | - E. Sankari Devi
- Organic Synthesis Group, Department of Chemistry; School of Chemical and Biotechnology; SASTRA University; Thanjavur 613401 India
| | - A. Tamil Selvi
- Department of Chemistry; Thiagarajar College; Madurai 625009 India
| | - Subbiah Nagarajan
- Organic Synthesis Group, Department of Chemistry; School of Chemical and Biotechnology; SASTRA University; Thanjavur 613401 India
| | - Vellaisamy Sridharan
- Organic Synthesis Group, Department of Chemistry; School of Chemical and Biotechnology; SASTRA University; Thanjavur 613401 India
| | - C. Uma Maheswari
- Organic Synthesis Group, Department of Chemistry; School of Chemical and Biotechnology; SASTRA University; Thanjavur 613401 India
| |
Collapse
|
47
|
Song T, Nairismagi M, Lim J, Nagarajan S, Pang J, Laurensia Y, Wijaya G, Jing T, Ong C. ONCOGENIC ACTIVATION OF STAT3 PATHWAY DRIVES PD-L1 EXPRESSION IN NATURAL KILLER/T CELL LYMPHOMA. Hematol Oncol 2017. [DOI: 10.1002/hon.2438_20] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- T. Song
- Division of Medical Oncology; National Cancer Centre Singapore; Singapore Singapore
| | - M. Nairismagi
- Division of Medical Oncology; National Cancer Centre Singapore; Singapore Singapore
| | - J. Lim
- Division of Medical Oncology; National Cancer Centre Singapore; Singapore Singapore
| | - S. Nagarajan
- Division of Medical Oncology; National Cancer Centre Singapore; Singapore Singapore
| | - J.W. Pang
- Division of Medical Oncology; National Cancer Centre Singapore; Singapore Singapore
| | - Y. Laurensia
- Division of Medical Oncology; National Cancer Centre Singapore; Singapore Singapore
| | - G.C. Wijaya
- Division of Medical Oncology; National Cancer Centre Singapore; Singapore Singapore
| | - T. Jing
- Division of Medical Oncology; National Cancer Centre Singapore; Singapore Singapore
| | - C. Ong
- Division of Medical Oncology; National Cancer Centre Singapore; Singapore Singapore
| |
Collapse
|
48
|
Reekhaye A, Sakthivel A, Nagarajan S, Gowda R. Metachronous bilateral testicular metastases from renal cell carcinoma: a case report. Journal of Clinical Urology 2017. [DOI: 10.1177/2051415815607420] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Affiliation(s)
- A Reekhaye
- Department of Urology, James Cook University Hospital, Middlesbrough, UK
| | - A Sakthivel
- Department of Urology, James Cook University Hospital, Middlesbrough, UK
| | - S Nagarajan
- Department of Pathology, James Cook University Hospital, Middlesbrough, UK
| | - R Gowda
- Department of Urology, James Cook University Hospital, Middlesbrough, UK
| |
Collapse
|
49
|
Nagarajan S, Deepthi K, Gowd EB. Structural evolution of poly(l-lactide) block upon heating of the glassy ABA triblock copolymers containing poly(l-lactide) A blocks. POLYMER 2016. [DOI: 10.1016/j.polymer.2016.06.031] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
|
50
|
Abstract
We present a case that we believe to be the largest mixed germ cell testicular tumour reported in the United Kingdom. A 23-year-old male was admitted to our urology department with a large scrotal swelling. The patient was found to have a giant left testicular tumour and a solitary lung metastasis at presentation. He underwent an emergency radical orchidectomy and subsequently received four cycles of bleomycin, etoposide and cisplatin chemotherapy. Four months after starting treatment, the tumour markers had normalised and a repeat staging computed tomography showed no active disease. The tumour reached that size because of the patient's failure to seek medical attention due to fear and embarrassment.
Collapse
Affiliation(s)
- A Reekhaye
- James Cook University Hospital , Middlesbrough , UK
| | - A Harris
- James Cook University Hospital , Middlesbrough , UK
| | - S Nagarajan
- James Cook University Hospital , Middlesbrough , UK
| | - D Chadwick
- James Cook University Hospital , Middlesbrough , UK
| |
Collapse
|