1
|
Ku S, Kaniyala Melanthota S, U R, Rai S, Mahato KK, Mazumder N. Characterization and classification of ductal carcinoma tissue using four channel based stokes-mueller polarimetry and machine learning. Lasers Med Sci 2024; 39:123. [PMID: 38703302 PMCID: PMC11069477 DOI: 10.1007/s10103-024-04056-5] [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] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/01/2022] [Accepted: 04/17/2024] [Indexed: 05/06/2024]
Abstract
Interaction of polarized light with healthy and abnormal regions of tissue reveals structural information associated with its pathological condition. Even a slight variation in structural alignment can induce a change in polarization property, which can play a crucial role in the early detection of abnormal tissue morphology. We propose a transmission-based Stokes-Mueller microscope for quantitative analysis of the microstructural properties of the tissue specimen. The Stokes-Mueller based polarization microscopy provides significant structural information of tissue through various polarization parameters such as degree of polarization (DOP), degree of linear polarization (DOLP), and degree of circular polarization (DOCP), anisotropy (r) and Mueller decomposition parameters such as diattenuation, retardance and depolarization. Further, by applying a suitable image processing technique such as Machine learning (ML) output images were analysed effectively. The support vector machine image classification model achieved 95.78% validation accuracy and 94.81% testing accuracy with polarization parameter dataset. The study's findings demonstrate the potential of Stokes-Mueller polarimetry in tissue characterization and diagnosis, providing a valuable tool for biomedical applications.
Collapse
Affiliation(s)
- Spandana Ku
- Department of Biophysics, Manipal School of Life Sciences, Manipal Academy of Higher Education, Manipal, 576104, India
| | - Sindhoora Kaniyala Melanthota
- Department of Biophysics, Manipal School of Life Sciences, Manipal Academy of Higher Education, Manipal, 576104, India
| | - Raghavendra U
- Department of Instrumentation and Control Engineering, Manipal Institute of Technology, Manipal Academy of Higher Education, Manipal, Karnataka, 576104, India
| | - Sharada Rai
- Department of Pathology, Kasturba Medical College, Mangalore, Karnataka, 575001, India
| | - K K Mahato
- Department of Biophysics, Manipal School of Life Sciences, Manipal Academy of Higher Education, Manipal, 576104, India
| | - Nirmal Mazumder
- Department of Biophysics, Manipal School of Life Sciences, Manipal Academy of Higher Education, Manipal, 576104, India.
| |
Collapse
|
2
|
Srinivas AN, Suresh D, Vishwanath PM, Satish S, Santhekadur PK, Koka S, Kumar DP. TACE inhibition: a promising therapeutic intervention against AATF-mediated steatohepatitis to hepatocarcinogenesis. Mol Oncol 2024. [PMID: 38558505 DOI: 10.1002/1878-0261.13646] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/16/2023] [Revised: 01/03/2024] [Accepted: 03/18/2024] [Indexed: 04/04/2024] Open
Abstract
Metabolic dysfunction-associated steatohepatitis-driven hepatocellular carcinoma (MASH-HCC) is a global clinical challenge for which there is a limited understanding of disease pathogenesis and a subsequent lack of therapeutic interventions. We previously identified that tumor necrosis factor-alpha (TNF-α) upregulated apoptosis antagonizing transcription factor (AATF) in MASH. Here, we investigated the effect of TNF-α converting enzyme (TACE) inhibition as a promising targeted therapy against AATF-mediated steatohepatitis to hepatocarcinogenesis. A preclinical murine model that recapitulates human MASH-HCC was used in the study. C57Bl/6 mice were fed with chow diet normal water (CD) or western diet sugar water (WD) along with a low dose of carbon tetrachloride (CCl4; 0.2 μL·g-1, weekly) for 24 weeks. TACE activity, TNF-α levels, and AATF expression were measured. The mice were treated with the TACE inhibitor Marimastat for 12 weeks, followed by analyses of liver injury, fibrosis, inflammation, and oncogenic signaling. In vitro experiments using stable clones of AATF control and AATF knockdown were also conducted. We found that AATF expression was upregulated in WD/CCl4 mice, which developed severe MASH at 12 weeks and advanced fibrosis with HCC at 24 weeks. WD/CCl4 mice showed increased TACE activity with reduced hepatic expression of sirtuin 1 (Sirt1) and tissue inhibitor of metalloproteinase 3 (Timp3). The involvement of the SIRT1/TIMP3/TACE axis was confirmed by the release of TNF-α, which upregulated AATF, a key molecular driver of MASH-HCC. Interestingly, TACE inhibition by Marimastat reduced liver injury, dyslipidemia, AATF expression, and oncogenic signaling, effectively preventing hepatocarcinogenesis. Furthermore, Marimastat inhibited the activation of JNK, ERK1/2, and AKT, which are key regulators of tumorigenesis in WD/CCl4 mice and in AATF control cells, but had no effect on AATF knockdown cells. This study shows that TACE inhibition prevents AATF-mediated inflammation, fibrosis, and oncogenesis in MASH-HCC, offering a potential target for therapeutic intervention.
Collapse
Affiliation(s)
- Akshatha N Srinivas
- Department of Biochemistry, CEMR Lab, JSS Medical College, JSS Academy of Higher Education and Research, Mysuru, India
| | - Diwakar Suresh
- Department of Biochemistry, CEMR Lab, JSS Medical College, JSS Academy of Higher Education and Research, Mysuru, India
| | - Prashant M Vishwanath
- Department of Biochemistry, CEMR Lab, JSS Medical College, JSS Academy of Higher Education and Research, Mysuru, India
| | - Suchitha Satish
- Department of Pathology, JSS Medical College and Hospital, JSS Academy of Higher Education and Research, Mysuru, India
| | - Prasanna K Santhekadur
- Department of Biochemistry, CEMR Lab, JSS Medical College, JSS Academy of Higher Education and Research, Mysuru, India
| | - Saisudha Koka
- Department of Pharmaceutical Sciences, Irma Lerma Rangel School of Pharmacy, Texas A&M University, Kingsville, TX, USA
| | - Divya P Kumar
- Department of Biochemistry, CEMR Lab, JSS Medical College, JSS Academy of Higher Education and Research, Mysuru, India
| |
Collapse
|
3
|
Heena, Yadav V, Saini S, Roy P, Layek S, Goswami T, Kumar S. An Indole-based Chromofluorogenic Probe for Detection of Trivalent Al 3+, Ga 3+, In 3+ and Fe 3+ Ions. Chempluschem 2024; 89:e202300721. [PMID: 38385783 DOI: 10.1002/cplu.202300721] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/07/2023] [Revised: 02/22/2024] [Accepted: 02/22/2024] [Indexed: 02/23/2024]
Abstract
An easily synthesizable indole-derived chromofluorogenic probe InNS has been demonstrated for recognition of trivalent metal ions (i. e., Al3+, Ga3+, In3+ and Fe3+). Both UV-Vis and emission spectral studies have been employed to assess the cation sensing ability of InNS in semi-aqueous medium. This probe exhibited a chromogenic response for these metal ions, and the related change was accompanied with the appearance of a new absorption near 376 nm. An obvious color change from pale yellow to dark yellow could also be noticed upon addition of the aforementioned metal ions to the probe's solution. Distinctively from the UV-Vis analysis, the fluorescence behavior of InNS was completely different; it displayed a 'turn-on' fluorescence response for only Al3+ among all the studied cations. The detection limit and the association constant (Ka) for Al3+ were determined to be 12.5 nM and 6.85×106 M-1, respectively. A potential 1 : 1 binding mode of Al3+-InNS has been established based on Job's plot, 1H NMR and DFT analyses. The reversibility experiment was conducted using strongly chelating EDTA ion, and a corresponding logic gate has been devised. In terms of practical applications, the InNS has been utilized to detect Al3+ in human breast carcinoma (MCF-7) cell lines displaying promising 'turn-on' bioimaging experiments.
Collapse
Affiliation(s)
- Heena
- Department of Chemistry, School of Engineering, University of Petroleum & Energy Studies (UPES), 248007, Dehradun, Uttarakhand, India
| | - Vikas Yadav
- Nanoscopic Imaging and Sensing Lab, Indian Institute of Technology Delhi, Hauz Khas, 110016, New Delhi, India
| | - Saakshi Saini
- Department of Biosciences and Bioengineering, Indian Institute of Technology, 247667, Roorkee, Uttarakhand, India
| | - Partha Roy
- Department of Biosciences and Bioengineering, Indian Institute of Technology, 247667, Roorkee, Uttarakhand, India
| | - Samar Layek
- Department of Physics, School of Engineering, University of Petroleum & Energy Studies (UPES), 248007, Dehradun, Uttarakhand, India
| | - Tapas Goswami
- Department of Chemistry, School of Engineering, University of Petroleum & Energy Studies (UPES), 248007, Dehradun, Uttarakhand, India
| | - Sushil Kumar
- Department of Chemistry, School of Engineering, University of Petroleum & Energy Studies (UPES), 248007, Dehradun, Uttarakhand, India
| |
Collapse
|
4
|
Unni S, Kommu P, Aouti S, Nalli Y, Bharath MMS, Ali A, Padmanabhan B. Structural insights into the modulation Of SOD1 aggregation By a fungal metabolite Phialomustin-B: Therapeutic potential in ALS. PLoS One 2024; 19:e0298196. [PMID: 38446760 PMCID: PMC10917278 DOI: 10.1371/journal.pone.0298196] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2023] [Accepted: 01/19/2024] [Indexed: 03/08/2024] Open
Abstract
Amyotrophic lateral sclerosis (ALS) is a fatal human motor neuron disease leading to muscle atrophy and paralysis. Mutations in superoxide dismutase 1 (SOD1) are associated with familial ALS (fALS). The SOD1 mutants in ALS have a toxic-gain of function by destabilizing the functional SOD1 homodimer, consequently inducing fibril-like aggregation with a cytotoxic non-native trimer intermediate. Therefore, reducing SOD1 oligomerization via chemical modulators is an optimal therapy in ALS. Here, we report the discovery of Phialomustin-B, an unsaturated secondary metabolite from the endophytic fungus Phialophora mustea, as a modulator of SOD1 aggregation. The crystal structure of the SOD1-Phialomustin complex refined to 1.90 Å resolution demonstrated for the first time that the ligand binds to the dimer interface and the lateral region near the electrostatic loop. The aggregation analyses of SOD1WT and the disease mutant SOD1A4V revealed that Phialomustin-B reduces cytotoxic trimerization. We propose that Phialomustin-B is a potent lead molecule with therapeutic potential in fALS.
Collapse
Affiliation(s)
- Sruthi Unni
- Department of Biophysics, National Institute of Mental Health and Neurosciences, Bengaluru, India
| | - Padmini Kommu
- Department of Biophysics, National Institute of Mental Health and Neurosciences, Bengaluru, India
| | - Snehal Aouti
- Department of Biophysics, National Institute of Mental Health and Neurosciences, Bengaluru, India
| | - Yedukondalu Nalli
- CSIR-Indian Institute of Integrative Medicine, Natural Product Division, Jammu, India
| | - M. M. Srinivas Bharath
- Department of Clinical Psychopharmacology and Neurotoxicology, National Institute of Mental Health and Neurosciences, Bengaluru, India
| | - Asif Ali
- CSIR-Indian Institute of Integrative Medicine, Natural Product Division, Jammu, India
- Medicinal & Process Chemistry Division, CSIR-Central Drug Research Institute, Jankipuram Extension, Lucknow, India
| | - Balasundaram Padmanabhan
- Department of Biophysics, National Institute of Mental Health and Neurosciences, Bengaluru, India
| |
Collapse
|
5
|
Kaur H, Kalia A, Manchanda P. Elucidating the effect of TiO 2 nanoparticles on mung bean rhizobia via in vitro assay: Influence on growth, morphology, and plant growth promoting traits. J Basic Microbiol 2024; 64:e2300306. [PMID: 38183339 DOI: 10.1002/jobm.202300306] [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] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2023] [Revised: 12/10/2023] [Accepted: 12/18/2023] [Indexed: 01/08/2024]
Abstract
Titanium dioxide nanoparticles (TiO2 NPs) are among the most commonly used nanomaterials and are most likely to end up in soil. Therefore, it is pertinent to study the interaction of TiO2 NPs with soil microorganisms. The present in vitro broth study evaluates the impacts of low-dose treatments (0, 1.0, 5.0, 10.0, 20.0, and 40.0 mg L-1 ) of TiO2 NPs on cell viability, morphology, and plant growth promoting (PGP) traits of rhizobia isolated from mung bean root nodule. Two types of TiO2 NPs, that is, mixture of anatase and rutile, and anatase alone were used in the study. These TiO2 NPs were supplemented in broth along with a multifunctional isolate (Bradyrhizobium sp.) and two reference cultures. The exposure of TiO2 (anatase+rutile) NPs at low concentrations (less than 20.0 mg L-1 ) enhanced the cell growth, and total soluble protein content, besides improving the phosphate solubilization, Indole-3-acetic acid (IAA) production, siderophore, and gibberellic acid production. The TiO2 (anatase) NPs enhanced exopolysaccharide (EPS) production by the test rhizobial cultures. The radical scavenging assay was performed to reveal the mode of action of the nano-TiO2 particles. The study revealed higher reactive oxygen species (ROS) generation by the TiO2 (anatase) NPs as compared with TiO2 (anatase+rutile) NPs. Exposure to TiO2 NPs also altered the morphology of rhizobial cells. The findings suggest that TiO2 NPs could act as promoters of PGP traits of PGP bacteria when applied at appropriate lower doses.
Collapse
Affiliation(s)
- Harleen Kaur
- Department of Microbiology, College of Basic Sciences and Humanities, Punjab Agricultural University, Ludhiana, India
| | - Anu Kalia
- Electron Microscopy and Nanoscience Laboratory, Department of Soil Science, College of Agriculture, Punjab Agricultural University, Ludhiana, India
| | - Pooja Manchanda
- School of Agricultural Biotechnology, College of Agriculture, Punjab Agricultural University, Ludhiana, India
| |
Collapse
|
6
|
Verma K, Chaturvedi R, Lahariya AK, Verma AK, Schneider KA, Anvikar AR, Bharti PK. Repurposing FDA-approved drugs to target malaria through inhibition of dihydrofolate reductase in the folate biosynthesis pathway: A prospective approach. J Cell Biochem 2024; 125:e30533. [PMID: 38345373 DOI: 10.1002/jcb.30533] [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] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/18/2023] [Revised: 01/26/2024] [Accepted: 01/30/2024] [Indexed: 03/12/2024]
Abstract
Dihydrofolate reductase (DHFR) is a ubiquitous enzyme that regulates the biosynthesis of tetrahydrofolate among various species of Plasmodium parasite. It is a validated target of the antifolate drug pyrimethamine (Pyr) in Plasmodium falciparum (Pf), but its clinical efficacy has been hampered due to the emergence of drug resistance. This has made the attempt to screen Food & Drug Administration-approved drugs against wild- and mutant PfDHFR by employing an in-silico pipeline to identify potent candidates. The current study has followed a virtual screening approach for identifying potential DHFR inhibitors from DrugBank database, based on a structure similarity search of candidates, followed by absorption, distribution, metabolism, and excretion estimation. The screened drugs were subjected to various parameters like docking, molecular mechanics with generalized born and surface area solvation calculations, and molecular simulations. We have thus identified two potential drug candidates, duloxetine and guanethidine, which can be repurposed to be tested for their efficacy against wild type and drug resistant falciparum malaria.
Collapse
Affiliation(s)
- Kanika Verma
- Department of Molecular Epidemiology, National Institute of Malaria Research, New Delhi, India
| | - Rini Chaturvedi
- Structural Parasitology Lab, International Centre for Genetic Engineering and Biotechnology, New Delhi, India
- Department of Microbiology, All India Institute of Medical Sciences, New Delhi, India
| | - Ayush K Lahariya
- Division of Vector-Borne Diseases, ICMR-National Institute of Research in Tribal Health, Jabalpur, Madhya Pradesh, India
| | - Anil K Verma
- Division of Vector-Borne Diseases, ICMR-National Institute of Research in Tribal Health, Jabalpur, Madhya Pradesh, India
| | - Kristan A Schneider
- Department Applied Computer and Bio-Sciences, University of Applied Sciences, Mittweida, Germany
| | - Anup R Anvikar
- Department of Molecular Epidemiology, National Institute of Malaria Research, New Delhi, India
| | - Praveen K Bharti
- Department of Molecular Epidemiology, National Institute of Malaria Research, New Delhi, India
| |
Collapse
|
7
|
Nathar S, Rajmichael R, Jeyaraj Pandian C, Nagarajan H, Mathimaran A, Kingsley JD, Jeyaraman J. Exploring Nocardia's ecological spectrum and novel therapeutic frontiers through whole-genome sequencing: unraveling drug resistance and virulence factors. Arch Microbiol 2024; 206:76. [PMID: 38267747 DOI: 10.1007/s00203-023-03799-z] [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] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/25/2023] [Revised: 12/14/2023] [Accepted: 12/15/2023] [Indexed: 01/26/2024]
Abstract
Nocardia farcinica is the leading pathogen responsible for nocardiosis, a life-threatening infection primarily affecting immunocompromised patients. In this study, the genomic sequence of a clinically isolated N. farcinica sample was sequenced. Subsequently, the assembled genome was annotated to identify antimicrobial resistance and virulence genes, as well as plasmid and prophages. The analysis of the entire genome size was 6,021,225 bp, with a GC content of 70.78% and consists of 103 contigs and N50 values of 292,531 bp. The genome analysis revealed the presence of several antimicrobial resistance genes, including RbpA, mtrA, FAR-1, blaFAR-1, blaFAR-1_1, and rox. In addition, virulence genes such as relA, icl, and mbtH were also detected. The present study signifies that N. farcinica genome is pivotal for the understanding of antimicrobial resistance and virulence genes is crucial for comprehending resistance mechanism, and developing effective strategies to combat bacterial infections effectively, especially adhesins and toxins. This study aids in identifying crucial drug targets for combating multidrug-resistant N. farcinica in the future.
Collapse
Affiliation(s)
- Shaslinah Nathar
- Structural Biology and Bio-Computing Lab, Department of Bioinformatics, Alagappa University, Science Block, Karaikudi, 630 003, Tamil Nadu, India
| | - Raji Rajmichael
- Structural Biology and Bio-Computing Lab, Department of Bioinformatics, Alagappa University, Science Block, Karaikudi, 630 003, Tamil Nadu, India
| | - Chitra Jeyaraj Pandian
- Department of Biotechnology, Dr. Umayal Ramanathan College for Women, Karaikudi, 630 003, Tamil Nadu, India
| | - Hemavathy Nagarajan
- Structural Biology and Bio-Computing Lab, Department of Bioinformatics, Alagappa University, Science Block, Karaikudi, 630 003, Tamil Nadu, India
| | - Ahila Mathimaran
- Structural Biology and Bio-Computing Lab, Department of Bioinformatics, Alagappa University, Science Block, Karaikudi, 630 003, Tamil Nadu, India
| | - Jemima D Kingsley
- Orbito Asia Diagnostics Private Limited Coimbatore, Coimbatore, 641 045, Tamil Nadu, India
| | - Jeyakanthan Jeyaraman
- Structural Biology and Bio-Computing Lab, Department of Bioinformatics, Alagappa University, Science Block, Karaikudi, 630 003, Tamil Nadu, India.
| |
Collapse
|
8
|
Divyavani C, Padmaja P, Reddy PN. Isocyanide-based Multicomponent Reactions (IMCRs) in Water or Aqueous Biphasic Systems. Curr Org Synth 2024; 21:140-165. [PMID: 37005400 DOI: 10.2174/1570179420666230330170845] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2022] [Revised: 01/25/2023] [Accepted: 02/10/2023] [Indexed: 04/04/2023]
Abstract
BACKGROUND Isocyanide is an intriguing one-carbon synthon that is frequently employed in a variety of carbon-carbon and carbon-heteroatom bond-forming reactions. Isocyanide-based multicomponent reactions (IMCRs) are effective synthetic tools in organic synthesis for the preparation of complex heterocyclic molecules. The IMCRs in water have become an attractive research direction, enabling simultaneous growth of both IMCRs and green solvents towards ideal organic synthesis. OBJECTIVE The goal of this review is to provide a general overview of IMCRs in water or biphasic aqueous systems for accessing various organic molecules, as well as an examination of their benefits and mechanistic insights. CONCLUSION High atom economies, mild reaction conditions, high yields, and catalyst-free processes are crucial features of these IMCRs in water or biphasic aqueous systems.
Collapse
Affiliation(s)
- Chitteti Divyavani
- Department of Chemistry, Sri Padmavathi Women's Degree & PG College, Tirupati, Andhra Pradesh, India
| | - Pannala Padmaja
- Centre for Semio Chemicals, CSIR-Indian Institute of Chemical Technology, Hyderabad, Telangana, India
| | | |
Collapse
|
9
|
Tantra T, Singh Y, Patekar R, Kulkarni S, Kumar P, Thareja S. Phosphate Prodrugs: An Approach to Improve the Bioavailability of Clinically Approved Drugs. Curr Med Chem 2024; 31:336-357. [PMID: 36757029 DOI: 10.2174/0929867330666230209094738] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2022] [Revised: 11/17/2022] [Accepted: 11/23/2022] [Indexed: 02/10/2023]
Abstract
The phosphate prodrug approach has emerged as a viable option for increasing the bioavailability of a drug candidate with low hydrophilicity and poor cell membrane permeability. When a phosphoric acid moiety is attached to the parent drug, it results in a several-fold elevation in aqueous solubility which helps to achieve desired bioavailability of the pharmaceutically active parental molecule. The neutral phosphate prodrugs have rapid diffusion ability through the plasma membrane as compared to their charged counterpart. The presence of phosphate mono ester breaking alkaline phosphatase (ALP) enzyme throughout the whole human body, is the main consideration behind the development of phosphate prodrug strategy. The popularity of this phosphate prodrug strategy is increasing nowadays due to the fulfillment of different desired pharmacokinetic characteristics required to get pharmaceutical and therapeutic responses without showing any serious adverse drug reactions (ADR). This review article mainly focuses on various phosphate prodrugs synthesized within the last decade to get an improved pharmacological response of the parent moiety along with various preclinical and clinical challenges associated with this approach. Emphasis is also given to the chemical mechanism to release the parent moiety from the prodrug.
Collapse
Affiliation(s)
- Tanmoy Tantra
- Department of Pharmaceutical Sciences and Natural Products, School of Health Sciences, Central University of Punjab, Bathinda, Punjab, 151401, India
| | - Yogesh Singh
- Department of Pharmaceutical Sciences and Natural Products, School of Health Sciences, Central University of Punjab, Bathinda, Punjab, 151401, India
| | - Rohan Patekar
- Department of Pharmaceutical Sciences and Natural Products, School of Health Sciences, Central University of Punjab, Bathinda, Punjab, 151401, India
| | - Swanand Kulkarni
- Department of Pharmaceutical Sciences and Natural Products, School of Health Sciences, Central University of Punjab, Bathinda, Punjab, 151401, India
| | - Pradeep Kumar
- Department of Pharmaceutical Sciences and Natural Products, School of Health Sciences, Central University of Punjab, Bathinda, Punjab, 151401, India
| | - Suresh Thareja
- Department of Pharmaceutical Sciences and Natural Products, School of Health Sciences, Central University of Punjab, Bathinda, Punjab, 151401, India
| |
Collapse
|
10
|
Singh H, Khatoon N, Bhardwaj SK, Kampani P, Nayak TK, Haridas V. Bispidine as a Versatile Scaffold: From Topological Hosts to Transmembrane Transporters. Chembiochem 2023; 24:e202300502. [PMID: 37708237 DOI: 10.1002/cbic.202300502] [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] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2023] [Revised: 08/24/2023] [Accepted: 09/14/2023] [Indexed: 09/16/2023]
Abstract
The development of designer topological structures is a synthetically challenging endeavor. We present herein bispidine as a platform for the design of molecules with various topologies and functions. The bispidine-based acyclic molecule, which shows intriguing S-shape topology, is discussed. Single-crystal X-ray diffraction studies revealed that this molecule exists in the solid state as two conformational enantiomers. In addition, bispidine-based designer macrocycles were synthesized and investigated for ionophoric properties. Patch clamp experiments revealed that these macrocycles transport both anions and cations non-specifically with at least tenfold higher chloride conductance over the cations under the given experimental conditions. Ultramicroscopy and single-crystal X-ray crystallographic studies indicated that the self-assembling macrocycle forms a tubular assembly. Our design highlights the use of unconventional dihydrogen interactions in nanotube fabrication.
Collapse
Affiliation(s)
- Hanuman Singh
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi, 110016, India
| | - Nadira Khatoon
- Kusuma School of Biological Science, Indian Institute of Technology Delhi, Hauz Khas, New Delhi, 110016, India
| | - Surya Kant Bhardwaj
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi, 110016, India
| | - Pradeepti Kampani
- Kusuma School of Biological Science, Indian Institute of Technology Delhi, Hauz Khas, New Delhi, 110016, India
| | - Tapan K Nayak
- Kusuma School of Biological Science, Indian Institute of Technology Delhi, Hauz Khas, New Delhi, 110016, India
| | - V Haridas
- Department of Chemistry, Indian Institute of Technology Delhi, Hauz Khas, New Delhi, 110016, India
| |
Collapse
|
11
|
Bankar OS, Laha D, Meher KB, Bhat RG. Umpolung Reactivity of Diazo Arylidene Succinimides: Distal C-H Functionalization of α-Thiocarbonyls from the Reactive Carbenoid Center. Chem Asian J 2023; 18:e202300774. [PMID: 37828837 DOI: 10.1002/asia.202300774] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/06/2023] [Revised: 10/09/2023] [Accepted: 10/10/2023] [Indexed: 10/14/2023]
Abstract
Herein, for the first time we have explored the umpolung reactivity of the vinylogous carbon center of diazo arylidene succinimide (DAS) through rhodium catalysis to achieve [2,3]-Stevens rearrangement of α-thioether esters. The protocol has successfully demonstrated the distal C-H bond functionalization of the α-thioether esters. Alongside, the carbenoid reactivity of DAS has also been achieved with Doyle-Kirmse reaction of allyl/propargyl phenyl sulfides. The protocol proved to be practical to synthesize a wide variety of [2,3]-Stevens rearrangement products exclusively and the possible side products emanating from Pummerer rearrangement and [1,2]-Stevens rearrangement were not observed. This catalytic protocol works smoothly in environmentally benign solvent under open air to afford the corresponding desired products with excellent diastereo-, regio- and chemo-selectivities in good to excellent yields. The protocol also proved to be scalable on gram quantity.
Collapse
Affiliation(s)
- Onkar S Bankar
- Department of Chemistry, Indian Institute of Science Education and Research (IISER) Pune, Dr. Homi Bhabha Road, NCL Colony, Pashan, Pune, Maharashtra, 411008, India
| | - Debasish Laha
- Department of Chemistry, Indian Institute of Science Education and Research (IISER) Pune, Dr. Homi Bhabha Road, NCL Colony, Pashan, Pune, Maharashtra, 411008, India
| | - Kajal B Meher
- Department of Chemistry, Indian Institute of Science Education and Research (IISER) Pune, Dr. Homi Bhabha Road, NCL Colony, Pashan, Pune, Maharashtra, 411008, India
| | - Ramakrishna G Bhat
- Department of Chemistry, Indian Institute of Science Education and Research (IISER) Pune, Dr. Homi Bhabha Road, NCL Colony, Pashan, Pune, Maharashtra, 411008, India
| |
Collapse
|
12
|
Kaur G, Kaur V, Kaur N, Kaur C, Sood K, Shanavas A, Sen T. Design of Silica@Au Hybrid Nanostars for Enhanced SERS and Photothermal Effect. Chemphyschem 2023; 24:e202200809. [PMID: 37515550 DOI: 10.1002/cphc.202200809] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2022] [Revised: 04/21/2023] [Accepted: 07/25/2023] [Indexed: 07/31/2023]
Abstract
Core-shell nanostructures of silicon oxide@noble metal have drawn a lot of interest due to their distinctive characteristics and minimal toxicity with remarkable biocompatibility. Due to the unique property of localized surface plasmon resonance (LSPR), plasmonic nanoparticles are being used as surface-enhanced Raman scattering (SERS) based detection of pollutants and photothermal (PT) agents in cancer therapy. Herein, we demonstrate the synthesis of multifunctional silica core - Au nanostars shell (SiO2 @Au NSs) nanostructures using surfactant free aqueous phase method. The SERS performance of the as-synthesized anisotropic core-shell NSs was examined using Rhodamine B (RhB) dye as a Raman probe and resulted in strong enhancement factor of 1.37×106 . Furthermore, SiO2 @Au NSs were also employed for PT killing of breast cancer cells and they exhibited a concentration-dependent increase in the photothermal effect. The SiO2 @Au NSs show remarkable photothermal conversion efficiency of up to 72 % which is unprecedented. As an outcome, our synthesized NIR active SiO2 @Au NSs are of pivotal importance to have their dual applications in SERS enhancement and PT effect.
Collapse
Affiliation(s)
- Gagandeep Kaur
- Institute of Nano Science and Technology, Sector- 81, Knowledge city, 140306, Mohali, India
| | - Vishaldeep Kaur
- Institute of Nano Science and Technology, Sector- 81, Knowledge city, 140306, Mohali, India
| | - Navneet Kaur
- Institute of Nano Science and Technology, Sector- 81, Knowledge city, 140306, Mohali, India
| | - Charanleen Kaur
- Institute of Nano Science and Technology, Sector- 81, Knowledge city, 140306, Mohali, India
| | - Kritika Sood
- Institute of Nano Science and Technology, Sector- 81, Knowledge city, 140306, Mohali, India
| | - Asifkhan Shanavas
- Institute of Nano Science and Technology, Sector- 81, Knowledge city, 140306, Mohali, India
| | - Tapasi Sen
- Institute of Nano Science and Technology, Sector- 81, Knowledge city, 140306, Mohali, India
| |
Collapse
|
13
|
Bag SS, Sinha S, Dutta S, Baishya HJ, Paul S. Targeting the SARS-CoV-2 RNA-dependent RNA polymerase (RdRp) with synthetic/designer unnatural nucleoside analogs: an in silico study. J Mol Model 2023; 29:366. [PMID: 37950101 DOI: 10.1007/s00894-023-05767-2] [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] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/16/2023] [Accepted: 10/25/2023] [Indexed: 11/12/2023]
Abstract
CONTEXT Since the outbreak of COVID-19 in December 2019, it developed into a pandemic affecting all the countries and millions of people around the globe. Until now, there is no medicine available to contain the spread of the virus. As an aid to drug discovery, the molecular docking and molecular dynamic tools were applied extensively. In silico studies made it possible for rapid screening of potential molecules as possible inhibitors/drugs against the targeted proteins. As a continuation of our drug discovery research, we have carried out molecular docking studies of our 12 reported unnatural nucleosides and 14 designer Avigan analogs with SARS-CoV-2, RNA-dependent RNA polymerase (RdRp), which we want to report herein. The same calculation was also carried out, taking 11 known/under trail/commercial nucleoside drug molecules for a comparison of the binding interactions in the catalytic site of RdRp. The docking results and binding efficiencies of our reported nucleosides and designer nucleosidic were compared with the binding energy of commercially available drugs such as remdesevir and favipiravir. Furthermore, we evaluated the protein-drug binding efficiency and stability of the best docked molecules by molecular dynamic studies (MD). From our study, we have found that few of our proposed drugs show promising binding efficiency at the catalytic pocket of SARS-CoV-2 RdRp and can be a promising RdRp inhibitor drug candidate. Hence, this study will be of importance to make progress toward developing successful nucleoside-based drugs and conduct the antiviral test in the wet lab to understand their efficacy against COVID-19. METHOD All the docking studies were carried out with AutoDock 4.2, AutoDock Vina and Molegro Virtual Docker. Following the docking studies, the MD simulations were carried out following the standard protocol with the GROMACS ver. 2019.6. by applying the CHARMM36 all-atom biomolecular force field. The drug-protein interaction was studied using the Biovia Discovery Studio suite, Ligplot software, and Protein-Ligand Interaction Profiler (PLIP).
Collapse
Affiliation(s)
- Subhendu Sekhar Bag
- Chemical Biology/Genomics Laboratory, Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, Assam, India, 781039.
- Centre for the Environment, Indian Institute of Technology Guwahati, Guwahati, Assam, India, 781039.
| | - Sayantan Sinha
- Centre for the Environment, Indian Institute of Technology Guwahati, Guwahati, Assam, India, 781039
| | - Soumya Dutta
- Chemical Biology/Genomics Laboratory, Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, Assam, India, 781039
| | - Hirak Jyoti Baishya
- Chemical Biology/Genomics Laboratory, Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, Assam, India, 781039
| | - Suravi Paul
- Chemical Biology/Genomics Laboratory, Department of Chemistry, Indian Institute of Technology Guwahati, Guwahati, Assam, India, 781039
| |
Collapse
|
14
|
Desai R, Jain R, Dandekar P. Surfactants reduce aggregation of monoclonal antibodies in cell culture medium with improvement in performance of mammalian cell culture. Biotechnol Prog 2023; 39:e3370. [PMID: 37348004 DOI: 10.1002/btpr.3370] [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] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2023] [Revised: 05/06/2023] [Accepted: 05/09/2023] [Indexed: 06/24/2023]
Abstract
Therapeutic monoclonal antibodies (mAbs) are biologics produced using mammalian cells and represent an important class of biotherapeutics. Aggregation in mAbs is a major challenge that can be mitigated by rigorous and reproducible upstream and downstream approaches. The impact of frequently used surfactants, like polysorbate 20, polysorbate 80, poloxamer 188, and 2-hydroxypropyl-beta-cyclodextrin, on aggregation of mAbs during cell culture was investigated in this study. Their impact on cell proliferation, viability, and mAb titer was also investigated. Polysorbate 20 and polysorbate 80 at the concentration of 0.01 g/L and poloxamer 188 at the concentration of 5 g/L were found to be effective in reducing aggregate formation in cell culture medium, without affecting the cell growth or viability. Furthermore, their presence in culture media resulted in increased cell proliferation as compared to the control group. Addition of these surfactants at the specified concentrations increased monomer production while decreasing high molecular weight species in the medium. After mAbs were separated, using protein "A" chromatography, flasks with surfactant exhibited improved antibody stability, when analyzed by DLS. Thus, while producing aggregation-prone mAbs via mammalian cell culture, these excipients may be employed as cell culture medium supplements to enhance the quality and yield of functional mAbs.
Collapse
Affiliation(s)
- Ranjeet Desai
- Department of Pharmaceutical Sciences and Technology, Institute of Chemical Technology, Mumbai, India
- Department of Biological Sciences and Biotechnology, Institute of Chemical Technology, Mumbai, India
| | - Ratnesh Jain
- Department of Biological Sciences and Biotechnology, Institute of Chemical Technology, Mumbai, India
| | - Prajakta Dandekar
- Department of Pharmaceutical Sciences and Technology, Institute of Chemical Technology, Mumbai, India
| |
Collapse
|
15
|
Singh S, Shinde VN, Kumar S, Meena N, Bhuvanesh N, Rangan K, Kumar A, Joshi H. Mono and Dinuclear Palladium Pincer Complexes of NNSe Ligand as a Catalyst for Decarboxylative Direct C-H Heteroarylation of (Hetero)arenes. Chem Asian J 2023; 18:e202300628. [PMID: 37602812 DOI: 10.1002/asia.202300628] [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] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/19/2023] [Revised: 08/18/2023] [Accepted: 08/18/2023] [Indexed: 08/22/2023]
Abstract
This report describes the synthesis of a new NNSe pincer ligand and its mono- and dinuclear palladium(II) pincer complexes. In the absence of a base, a dinuclear palladium pincer complex (C1) was isolated, while in the presence of Et3 N base a mononuclear palladium pincer complex (C2) was obtained. The new ligand and complexes were characterized using techniques like 1 H, 13 C{1 H} nuclear magnetic resonance (NMR), fourier transform infrared (FTIR), high-resolution mass spectrometry (HRMS), ultraviolet-visible (UV-Visible), and cyclic voltammetry. Both the complexes showed pincer coordination mode with a distorted square planar geometry. The complex C1 has two pincer ligands attached through a Pd-Pd bond in a dinuclear pincer fashion. The air and moisture-insensitive, thermally robust palladium pincer complexes were used as the catalyst for decarboxylative direct C-H heteroarylation of (hetero)arenes. Among the complexes, dinuclear pincer complex C1 showed better catalytic activity. A variety of (hetero)arenes were successfully activated (43-87 % yield) using only 2.5 mol % of catalyst loading under mild reaction conditions. The PPh3 and Hg poisoning experiments suggested a homogeneous nature of catalysis. A plausible reaction pathway was proposed for the dinuclear palladium pincer complex catalyzed decarboxylative C-H bond activation reaction of (hetero)arenes.
Collapse
Affiliation(s)
- Sohan Singh
- ISC Laboratory, Department of Chemistry, School of Chemical Sciences and Pharmacy, Central University of Rajasthan, NH-8, Bandarsindri, Ajmer, Rajasthan, 305817, India
| | - Vikki N Shinde
- Department of Chemistry, Birla Institute of Technology and Science, Pilani, Pilani Campus, Pilani, 333031, India
| | - Sunil Kumar
- ISC Laboratory, Department of Chemistry, School of Chemical Sciences and Pharmacy, Central University of Rajasthan, NH-8, Bandarsindri, Ajmer, Rajasthan, 305817, India
| | - Neha Meena
- Department of Chemistry, Birla Institute of Technology and Science, Pilani, Pilani Campus, Pilani, 333031, India
| | - Nattamai Bhuvanesh
- Department of Chemistry, Texas A&M University, PO Box 30012, College Station, Texas, 77842-3012, USA
| | - Krishnan Rangan
- Department of Chemistry, Birla Institute of Technology and Science Pilani, Hyderabad Campus, Telangana, 500078, India
| | - Anil Kumar
- Department of Chemistry, Birla Institute of Technology and Science, Pilani, Pilani Campus, Pilani, 333031, India
| | - Hemant Joshi
- ISC Laboratory, Department of Chemistry, School of Chemical Sciences and Pharmacy, Central University of Rajasthan, NH-8, Bandarsindri, Ajmer, Rajasthan, 305817, India
| |
Collapse
|
16
|
Ranjan Sahoo S, Gupta K, Singh VK. Enantioselective Dearomative [4+2] Cycloaddition Reaction of 1-Naphthols with In-Situ Generated ortho-Quinone Methides. Chemistry 2023:e202302707. [PMID: 37708402 DOI: 10.1002/chem.202302707] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [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: 08/18/2023] [Revised: 09/13/2023] [Accepted: 09/14/2023] [Indexed: 09/16/2023]
Abstract
We disclose a catalytic, enantioselective dearomative reaction of non-functionalized 1-naphthols, which poses a synthetic challenge to organic chemists because of the relative ease of rearomatization via the elimination of a proton. In this work, the direct dearomatization of non-functionalized 1-naphthols was achieved through a chiral phosphoric acid (CPA) catalyzed enantioselective dearomative [4+2] cycloaddition reaction with in-situ generated ortho-quinone methides (o-QMs). The reported convergent method allows the use of readily available simple 1-naphthols without pre-functionalization, furnishing a variety of naphthopyran derivatives in good yields (up to 96 %) and moderate to excellent enantioselectivities (up to >99 % ee) under mild reaction conditions. The observed regio-, diastereo-, and enantioselectivities are the keys to the success of the current strategy utilizing o-QM as a diene surrogates, in combination with CPA catalysis.
Collapse
Affiliation(s)
- Sushree Ranjan Sahoo
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, Uttar Pradesh 208016, India
| | - Khushboo Gupta
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, Uttar Pradesh 208016, India
| | - Vinod K Singh
- Department of Chemistry, Indian Institute of Technology Kanpur, Kanpur, Uttar Pradesh 208016, India
| |
Collapse
|
17
|
Bashir J, Romshoo SA. Bias-corrected climate change projections over the Upper Indus Basin using a multi-model ensemble. Environ Sci Pollut Res Int 2023; 30:64517-64535. [PMID: 37071365 DOI: 10.1007/s11356-023-26898-2] [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] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2022] [Accepted: 04/05/2023] [Indexed: 05/11/2023]
Abstract
The study projects climate over the Upper Indus Basin (UIB), covering geographic areas in India, Pakistan, Afghanistan, and China, under the two Representative Concentration Pathways (RCPs), viz., RCP4.5 and RCP8.5 by the late twenty-first century using the best-fit climate model validated against the climate observations from eight meteorological stations. GFDL CM3 performed better than the other five evaluated climate models in simulating the climate of the UIB. The model bias was significantly reduced by the Aerts and Droogers statistical downscaling method, and the projections overall revealed a significant increase in temperature and a slight increase in precipitation across the UIB comprising of Jhelum, Chenab, and Indus sub-basins. According to RCP4.5 and RCP8.5, the temperature and precipitation in the Jhelum are projected to increase by 3 °C and 5.2 °C and 0.8% and 3.4% respectively by the late twenty-first century. The temperature and precipitation in the Chenab are projected to increase by 3.5 °C and 4.8 °C and 8% and 8.2% respectively by the late twenty-first century under the two scenarios. The temperature and precipitation in the Indus are projected to increase by 4.8 °C and 6.5 °C and 2.6% and 8.7% respectively by the late twenty-first century under RCP4.5 and RCP8.5 scenarios. The late twenty-first century projected climate would have significant impacts on various ecosystem services and products, irrigation and socio-hydrological regimes, and various dependent livelihoods. It is therefore hoped that the high-resolution climate projections would be useful for impact assessment studies to inform policymaking for climate action in the UIB.
Collapse
Affiliation(s)
- Jasia Bashir
- Department of Geoinformatics, University of Kashmir, Jammu and Kashmir, 190006, Hazratbal, Srinagar, India
| | - Shakil Ahmad Romshoo
- Department of Geoinformatics, University of Kashmir, Jammu and Kashmir, 190006, Hazratbal, Srinagar, India.
| |
Collapse
|
18
|
Mondal S, De N, Pal A. Neighborhood degree sum-based molecular descriptors of fractal and Cayley tree dendrimers. Eur Phys J Plus 2021; 136:303. [PMID: 33717795 PMCID: PMC7942711 DOI: 10.1140/epjp/s13360-021-01292-4] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 01/10/2021] [Accepted: 03/02/2021] [Indexed: 06/12/2023]
Abstract
Topological index is a connection between the chemical structure and the real number that remains invariant under graph isomorphism. In structure-property and structure-activity modeling, topological indices are considered as essential molecular descriptors to predict different physicochemical properties of molecule. Dendrimers are considered to be the most significant, commercially accessible basic components in nanotechnology. In this report, some neighborhood degree sum-based molecular descriptors are obtained for the fractal tree and the Cayley tree dendrimers. Neighborhood M-polynomial yields a family of topological indices for a molecular graph in less time compared to the usual computation from their definitions. Some indices are obtained using neighborhood M-polynomial approach. In addition, some multiplicative neighborhood degree sum-based molecular descriptors are evaluated for fractal and Cayley tree dendrimers. The graphical representations of the outcomes are presented. A comparative study of the findings with some well-known degree-based indices is performed. Usefulness of the descriptors in modeling different properties and activities is discussed.
Collapse
Affiliation(s)
- Sourav Mondal
- Department of Mathematics, National Institute of Technology Durgapur, Durgapur, West Bengal 713209 India
| | - Nilanjan De
- Department of Basic Sciences and Humanities (Mathematics), Calcutta Institute of Engineering and Management, Kolkata, India
| | - Anita Pal
- Department of Mathematics, National Institute of Technology Durgapur, Durgapur, West Bengal 713209 India
| |
Collapse
|
19
|
Ali I, Suhail M, Asnin L. Chiral separation and modeling of quinolones on teicoplanin macrocyclic glycopeptide antibiotics CSP. Chirality 2018; 30:1304-1311. [PMID: 30321474 DOI: 10.1002/chir.23024] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2018] [Revised: 07/28/2018] [Accepted: 08/30/2018] [Indexed: 11/07/2022]
Abstract
New chiral high-performance liquid chromatography (HPLC) method for the enantiomeric resolution of quinolones is developed and described. The column used was Chirobiotic T (150 × 4.6 mm, 5.0 μm). Three mobile phases used were MeOH:ACN:Water:TEA (70:10:20:0.1%), (60:30:10:0.1%), and (50:30:20:0.1%). The flow rate of the mobile phases was 1.0 mL/min with UV detection at different wavelengths. The values of retention, resolution, and separation factors ranged from 1.5 to 6.0, 1.80 to 2.25, and 2.86 to 6.0, respectively. The limit of detection and quantification ranged from 4.0 to 12 ng and 40 to 52 ng, respectively. The modeling studies indicated strong interactions of R-enantiomers with teicoplanin chiral selector than S-enantiomers. The supra molecular mechanism of the chiral recognition was established by modeling and chromatographic studies. It was observed that hydrogen bondings and π-π interactions are the major forces for chiral separation. The present chiral HPLC method may be used for enantiomeric resolution of quinolones in any matrices.
Collapse
Affiliation(s)
- Imran Ali
- Department of Chemistry, Jamia Millia Islamia Central University, New Delhi, India
- Department of Chemistry, College of Sciences, Taibah University, Al-Medina, Saudi Arabia
| | - Mohd Suhail
- Department of Chemistry, Jamia Millia Islamia Central University, New Delhi, India
| | - Leonid Asnin
- Perm National Research Polytechnic University, Perm, Russia
| |
Collapse
|