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Rajeswari B, Sravani B, Cheffena M, Janraj Naik R, Veera Manohara Reddy Y, Madhavi G, Suresh Reddy K, Jong Kim M. Ethylene glycol-assisted synthesis of reduced graphene oxide-supported bimetallic Pt-Co nanoparticles for the ultra-sensitive detection of tert-butyl hydroquinone. INORG CHEM COMMUN 2023. [DOI: 10.1016/j.inoche.2023.110627] [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: 03/17/2023]
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Bhagath YB, Lee SY, Kola M, Sharma TSK, Beulah AM, Reddy YVM, Park TJ, Park JP, Sahukari R, Madhavi G. Effect of Sulfamerazine on Structural Characteristics of Sodium Alginate Biopolymeric Films. BIOTECHNOL BIOPROC E 2022. [DOI: 10.1007/s12257-021-0367-8] [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: 11/02/2022]
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Reddy YVM, Shin JH, Palakollu VN, Sravani B, Choi CH, Park K, Kim SK, Madhavi G, Park JP, Shetti NP. Strategies, advances, and challenges associated with the use of graphene-based nanocomposites for electrochemical biosensors. Adv Colloid Interface Sci 2022; 304:102664. [PMID: 35413509 DOI: 10.1016/j.cis.2022.102664] [Citation(s) in RCA: 50] [Impact Index Per Article: 25.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2021] [Revised: 03/18/2022] [Accepted: 04/04/2022] [Indexed: 12/29/2022]
Abstract
Graphene is an intriguing two-dimensional honeycomb-like carbon material with a unique basal plane structure, charge carrier mobility, thermal conductivity, wide electrochemical spectrum, and unusual physicochemical properties. Therefore, it has attracted considerable scientific interest in the field of nanoscience and bionanotechnology. The high specific surface area of graphene allows it to support high biomolecule loading for good detection sensitivity. As such, graphene, graphene oxide (GO), and reduced GO are excellent materials for the fabrication of new nanocomposites and electrochemical sensors. Graphene has been widely used as a chemical building block and/or scaffold with various materials to create highly sensitive and selective electrochemical sensing microdevices. Over the past decade, significant advancements have been made by utilizing graphene and graphene-based nanocomposites to design electrochemical sensors with enhanced analytical performance. This review focus on the synthetic strategies, as well as the structure-to-function studies of graphene, electrochemistry, novel multi nanocomposites combining graphene, limit of detection, stability, sensitivity, assay time. Finally, the review describes the challenges, strategies and outlook on the future development of graphene sensors technology that would be usable for the internet of things are also highlighted.
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Manohara Reddy YV, Shin JH, Hwang J, Kweon DH, Choi CH, Park K, Kim SK, Madhavi G, Yi H, Park JP. Fine-tuning of MXene-nickel oxide-reduced graphene oxide nanocomposite bioelectrode: Sensor for the detection of influenza virus and viral protein. Biosens Bioelectron 2022; 214:114511. [DOI: 10.1016/j.bios.2022.114511] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/01/2022] [Revised: 06/21/2022] [Accepted: 06/23/2022] [Indexed: 11/30/2022]
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Sravani B, Kiranmai S, Rajasekhara Reddy G, Park JP, VeeraManohara Reddy Y, Madhavi G. Highly sensitive detection of anti-cancer drug based on bimetallic reduced graphene oxide nanocomposite. Chemosphere 2022; 287:132281. [PMID: 34826940 DOI: 10.1016/j.chemosphere.2021.132281] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/16/2021] [Revised: 08/27/2021] [Accepted: 09/16/2021] [Indexed: 06/13/2023]
Abstract
Herein, we describe a high-performance electrochemical sensor for the detection of regorafenib (REG) using bimetallic Pd-Ru nanoparticles anchored on pomegranate peel extract (PPE) derived reduced graphene oxide (Pd-Ru/rGO). PPE was employed to neutralize the extremely acidic graphene then cast-off along with the metal precursor for the duration of the chemical reduction to accomplish well dispersed Pd-Ru nanoparticles. Bimetallic Pd-Ru/rGO nanocomposites were synthesized using a facile chemical reduction method. Under optimal conditions, based on the differential pulse voltammetric studies it has been confirmed that the fabricated sensors has good electrocatalytic activity toward the detection of REG, spanning over the linear dynamic range of 0.5-300 nM. Moreover, the sensor exhibited a low limit of detection of 1.6 nM and a limit of quantification of 4.8 nM. The electrochemical sensor unveiled admirable selectivity and sensitivity, reproducibility, and repeatability. The fabricated sensor was suitable for real sample analysis (pharmaceutical tablet, human blood plasm, wastewater) with satisfactory recovery. The strategy presented herein can be employed in the development of electrochemical sensors for other target analytes.
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Affiliation(s)
- Bathinapatla Sravani
- Nanoelectrochemistry Lab, Department of Chemistry, Υogi Vemana University, Kadapa, 516005, India
| | - S Kiranmai
- Electrochemical Research Lab, Department of Chemistry, Sri Venkateswara University, Tirupati, 517502, India
| | | | - Jong Pil Park
- Department of Food Science and Technology, Chung - Ang University, 4726, Seodongdaero, Anesong, 17546, Republic of Korea.
| | - Y VeeraManohara Reddy
- Electrochemical Research Lab, Department of Chemistry, Sri Venkateswara University, Tirupati, 517502, India; Department of Food Science and Technology, Chung - Ang University, 4726, Seodongdaero, Anesong, 17546, Republic of Korea.
| | - G Madhavi
- Electrochemical Research Lab, Department of Chemistry, Sri Venkateswara University, Tirupati, 517502, India.
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Daneswari V, Venugopal Reddy N, Madhavi G, Pranathi P. Assessing the Pain Reaction of Children and Evaluation of Efficacy of Buccal Infiltration with Articaine and Inferior Alveolar Nerve Block with Lignocaine for Pulp Therapy in Primary Mandibular Second Molars. Int J Clin Pediatr Dent 2021; 14:335-339. [PMID: 34720502 PMCID: PMC8543985 DOI: 10.5005/jp-journals-10005-1976] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022] Open
Abstract
Introduction Pain-free operating is of obvious benefit to the patient, it also helps the operator as treatment can be performed in a calm, unhurried fashion. Articaine hydrochloride has steadily grown in popularity, and studies have shown that articaine hydrochloride performs better than lidocaine due to an enhanced anesthetic efficacy. Aim and objective To assess the efficacy of buccal infiltration with articaine in achieving anesthesia for pulp therapy in primary mandibular second molars as compared with inferior alveolar nerve block (IANB) with lignocaine. Materials and methods Thirty patients (4-8 years) with an indication of pulp therapy in at least two primary mandibular second molars were selected. Patients were randomly assigned to receive nerve block with lignocaine on the first appointment and buccal infiltration with articaine on the second appointment spaced 1 week apart. A single researcher injected local anesthetic for all the patients. Two researchers standing at a distance of 1.5 m recorded the pain scores and sound, eye, motor (SEM) scores. After the completion of the procedure, the patient was asked to record facial image (FI) score and Heft-Parker visual analog score (HP-VAS). Results The pain-related behavior scores were higher for IANB when compared with infiltration. Facial image and HP-VAS scores were higher for the lignocaine IANB group when compared with the articaine infiltration. Conclusion With the increasing use of new delivery systems such as single tooth analgesia, a buccal infiltration with articaine provides an effective alternative, with minimal discomfort which would allow clinicians to avoid the use of IANB in children. How to cite this article Daneswari V, Venugopal Reddy N, Madhavi G, et al. Assessing the Pain Reaction of Children and Evaluation of Efficacy of Buccal Infiltration with Articaine and Inferior Alveolar Nerve Block with Lignocaine for Pulp Therapy in Primary Mandibular Second Molars. Int J Clin Pediatr Dent 2021;14(3):335-339.
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Affiliation(s)
- Velagala Daneswari
- Department of Pedodontics and Preventive Dentistry, Mamata Dental College, Khammam, Telangana, India
| | - Nagireddy Venugopal Reddy
- Department of Pedodontics and Preventive Dentistry, Mamata Dental College, Khammam, Telangana, India
| | - G Madhavi
- Department of Pedodontics and Preventive Dentistry, Mamata Dental College, Khammam, Telangana, India
| | - P Pranathi
- Department of Pedodontics and Preventive Dentistry, Mamata Dental College, Khammam, Telangana, India
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Madhuri C, Manohara Reddy YV, Prabhakar Vattikuti S, Švorc Ľ, Shim J, Madhavi G. Trace-level determination of amlodipine besylate by immobilization of palladium-silver bi-metallic nanoparticles on reduced graphene oxide as an electrochemical sensor. J Electroanal Chem (Lausanne) 2019. [DOI: 10.1016/j.jelechem.2019.113259] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/08/2023]
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Saritha D, Koirala A, Venu M, Reddy GD, Reddy AVB, Sitaram B, Madhavi G, Aruna K. A simple, highly sensitive and stable electrochemical sensor for the detection of quercetin in solution, onion and honey buckwheat using zinc oxide supported on carbon nanosheet (ZnO/CNS/MCPE) modified carbon paste electrode. Electrochim Acta 2019. [DOI: 10.1016/j.electacta.2019.04.188] [Citation(s) in RCA: 16] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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Sravani B, Maseed H, Y C, Y VMR, V V S S S, Madhavi G, L SS. A Pt-free graphenaceous composite as an electro-catalyst for efficient oxygen reduction reaction. Nanoscale 2019; 11:13300-13308. [PMID: 31287482 DOI: 10.1039/c9nr02912e] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/07/2023]
Abstract
Use of Pt-based electro-catalysts for the oxygen reduction reaction (ORR) is a major hindrance in large-scale application of proton exchange membrane fuel cells (PEMFCs). Hence, new, cost-effective and high performance electro-catalysts are required for the commercial success of PEMFCs. In this work, a Pt-free magnesium oxide (MgO) decorated multi-layered reduced graphene oxide (MLGO) composite is tested as an electro-catalyst for the ORR. The ORR activity of MgO/MLGO in terms of diffusion-controlled current density is found to be superior (6.63 mA per cm2-geo) than that of in-house prepared Pt/rGO (5.96 mA per cm2-geo) and commercial Pt/C (5.02 mA per cm2-geo). The applicability of less expensive MgO/MLGO not only provides a new electro-catalyst but also provides a new direction in exploring metal oxide-based electro-catalysts for the ORR.
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Affiliation(s)
- Bathinapatla Sravani
- Nanoelectrochemistry Laboratory, Department of Chemistry, Yogi Vemana University, Kadapa - 516 005, Andhra Pradesh, India.
| | - H Maseed
- School of Engineering Sciences and Technology, University of Hyderabad, Gachibowli, Hyderabad - 500 046, Telangana, India.
| | - Chandrasekhar Y
- School of Engineering Sciences and Technology, University of Hyderabad, Gachibowli, Hyderabad - 500 046, Telangana, India.
| | - Veera Manohara Reddy Y
- Electrochemical Research Laboratory, Department of Chemistry, Sri Venkateswara University, Tirupati - 517 502, Andhra Pradesh, India
| | - Srikanth V V S S
- School of Engineering Sciences and Technology, University of Hyderabad, Gachibowli, Hyderabad - 500 046, Telangana, India.
| | - G Madhavi
- Electrochemical Research Laboratory, Department of Chemistry, Sri Venkateswara University, Tirupati - 517 502, Andhra Pradesh, India
| | - Subramanyam Sarma L
- Nanoelectrochemistry Laboratory, Department of Chemistry, Yogi Vemana University, Kadapa - 516 005, Andhra Pradesh, India.
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Sivaprasad M, Shalini T, Reddy PY, Seshacharyulu M, Madhavi G, Kumar BN, Reddy GB. Prevalence of vitamin deficiencies in an apparently healthy urban adult population: Assessed by subclinical status and dietary intakes. Nutrition 2019; 63-64:106-113. [DOI: 10.1016/j.nut.2019.01.017] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/01/2018] [Revised: 09/21/2018] [Accepted: 01/21/2019] [Indexed: 10/27/2022]
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Venkateswarlu S, Venu M, Reddy YVM, Sravani B, Mallikarjuna K, Yoon M, Madhavi G. Facile Preparation of Ionic Liquid‐coated Copper Nanowire‐modified Carbon Paste Electrode for Electrochemical Detection of Etilefrine Drug. B KOREAN CHEM SOC 2019. [DOI: 10.1002/bkcs.11734] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
Affiliation(s)
- Sada Venkateswarlu
- Department of NanochemistryGachon University Sungnam 13120 Republic of Korea
| | - Manthrapudi Venu
- Department of ChemistrySri Venkateswara University Tirupati India
| | | | | | - K. Mallikarjuna
- School of Materials Science and EngineeringYeungnam University Gyeongsan 712749 Republic of Korea
| | - Minyoung Yoon
- Department of NanochemistryGachon University Sungnam 13120 Republic of Korea
| | - G. Madhavi
- Department of ChemistrySri Venkateswara University Tirupati India
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Mallikarjuna K, Veera Manohara Reddy Y, Sravani B, Madhavi G, Kim H, Agarwal S, Gupta VK. Simple synthesis of biogenic Pd Ag bimetallic nanostructures for an ultra-sensitive electrochemical sensor for sensitive determination of uric acid. J Electroanal Chem (Lausanne) 2018. [DOI: 10.1016/j.jelechem.2018.05.019] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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Veera Manohara Reddy Y, Sravani B, Agarwal S, Gupta VK, Madhavi G. Electrochemical sensor for detection of uric acid in the presence of ascorbic acid and dopamine using the poly(DPA)/SiO 2 @Fe 3 O 4 modified carbon paste electrode. J Electroanal Chem (Lausanne) 2018. [DOI: 10.1016/j.jelechem.2018.04.059] [Citation(s) in RCA: 73] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/14/2022]
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Veera Manohara Reddy Y, Sravani B, Maseed H, Łuczak T, Osińska M, SubramanyamSarma L, Srikanth VVSS, Madhavi G. Ultrafine Pt–Ni bimetallic nanoparticles anchored on reduced graphene oxide nanocomposites for boosting electrochemical detection of dopamine in biological samples. NEW J CHEM 2018. [DOI: 10.1039/c8nj03894e] [Citation(s) in RCA: 46] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The present report demonstrates the development of a Pt–Ni/rGO composite electrochemical sensor for the detection of dopamine.
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Affiliation(s)
- Y. Veera Manohara Reddy
- Electrochemical Research Laboratory
- Department of Chemistry
- Sri Venkateswara University
- Tirupati – 517502
- India
| | - Bathinapatla Sravani
- Nanoelectrochemistry Laboratory
- Department of Chemistry
- Yogi Vemana University
- Kadapa-516380
- India
| | - Hussen Maseed
- School of Engineering Science and Technology
- University of Hyderabad
- India
| | - T. Łuczak
- Faculty of Chemistry
- Adam Mickiewicz University in Poznan
- 61-614 Poznan
- Poland
| | - M. Osińska
- Poznan University of Technology
- Institute of Chemistry and Technical Electrochemistry
- 60-965 Poznan
- Poland
| | - L. SubramanyamSarma
- Nanoelectrochemistry Laboratory
- Department of Chemistry
- Yogi Vemana University
- Kadapa-516380
- India
| | | | - G. Madhavi
- Electrochemical Research Laboratory
- Department of Chemistry
- Sri Venkateswara University
- Tirupati – 517502
- India
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Veera Manohara Reddy Y, Bathinapatla S, Łuczak T, Osińska M, Maseed H, Ragavendra P, Subramanyam Sarma L, Srikanth VVSS, Madhavi G. An ultra-sensitive electrochemical sensor for the detection of acetaminophen in the presence of etilefrine using bimetallic Pd–Ag/reduced graphene oxide nanocomposites. NEW J CHEM 2018. [DOI: 10.1039/c7nj04775d] [Citation(s) in RCA: 59] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
In this study we report a one-step procedure for the fabrication of Pd–Ag bimetallic nanoparticles on the surface of a graphene oxide (rGO) support.
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Affiliation(s)
- Y. Veera Manohara Reddy
- Electrochemical Research Laboratory
- Department of Chemistry
- Sri Venkateswara University
- Tirupati
- India
| | - Sravani Bathinapatla
- Nanoelectrochemistry Laboratory
- Department of Chemistry
- Yogi Vemana University
- Kadapa
- India
| | - T. Łuczak
- Department of Chemistry
- Adam Mickiewicz University in Poznań
- 61-614 Poznań
- Poland
| | - M. Osińska
- Poznan University of Technology
- Institute of Chemistry and Technical Electrochemistry
- Poznań
- Poland
| | - H. Maseed
- School of Engineering Sciences and Technology
- University of Hyderabad
- Hyderabad
- India
| | - P. Ragavendra
- Nanoelectrochemistry Laboratory
- Department of Chemistry
- Yogi Vemana University
- Kadapa
- India
| | - L. Subramanyam Sarma
- Nanoelectrochemistry Laboratory
- Department of Chemistry
- Yogi Vemana University
- Kadapa
- India
| | - V. V. S. S. Srikanth
- School of Engineering Sciences and Technology
- University of Hyderabad
- Hyderabad
- India
| | - G. Madhavi
- Electrochemical Research Laboratory
- Department of Chemistry
- Sri Venkateswara University
- Tirupati
- India
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Krishna MV, Sowhardhra M, Kumar MS, Madhavi G, Jadhav T, Thakkar D. Effect of surfactants and hydrophilic polymers on the stability of an antihypertensive drug candesartan cilexetil: Evaluation by HPLC. Ann Pharm Fr 2017; 76:32-43. [PMID: 29174608 DOI: 10.1016/j.pharma.2017.09.001] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [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: 03/14/2017] [Revised: 08/31/2017] [Accepted: 09/17/2017] [Indexed: 10/18/2022]
Abstract
OBJECTIVES The objective of this study is to investigate the effect of surfactants (polysorbate 80 and sodium lauryl sulphate) and hydrophilic polymers (polyvinylpyrrolidone and polyethylene glycol 6000) on the stability of candesartan cilexetil under isothermal stress conditions (100°C, 48h). METHODS HPLC method was employed to evaluate the drug content and formation of degradation products in stress samples. Drug and degradation products were separated on Hypersil BDS C18 (250×4.6mm, 5μ) column using acetonitrile-water (pH 2.8) in the ratio of 85:15% v/v as a mobile phase. RESULT Similar degradation behaviour of drug was observed with polyvinylpyrrolidone, polyethylene glycol 6000 and polysorbate 80; four common degradation peaks were observed at the retention time of 3.7, 4.5, 7.8 and 11minutes. One extra common degradation peak of very low intensity was also observed with polyethylene glycol 6000 and polysorbate 80 at the retention time of 4.2min. The drug was eluting at the retention time of 5.4min. In the case of sodium lauryl sulphate, two prominent degradation peaks were observed at the retention time of 3.7 and 13.25min along with few very low-intensity degradation peaks. CONCLUSION The drug showed 41%, 64%, 72% and 98% degradation in presence of polyvinylpyrrolidone, polyethylene glycol 6000, polysorbate 80 and sodium lauryl sulphate, respectively.
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Affiliation(s)
- M V Krishna
- National Institute of Pharmaceutical Education and Research-Ahmedabad, Opposite Air Force Station, Palaj, Gandhinagar 382355, Gujarat, India.
| | - M Sowhardhra
- Alliance Institute of Advanced Pharmaceutical and Health Sciences, Hyderabad 500038, Telangana, India
| | - M S Kumar
- Alliance Institute of Advanced Pharmaceutical and Health Sciences, Hyderabad 500038, Telangana, India
| | - G Madhavi
- University College of Pharmaceutical Sciences, Acharya Nagarjuna University, Nagarjuna Nagar, Guntur 522 510, Andhra Pradesh, India
| | - T Jadhav
- National Institute of Pharmaceutical Education and Research-Ahmedabad, Opposite Air Force Station, Palaj, Gandhinagar 382355, Gujarat, India
| | - D Thakkar
- National Institute of Pharmaceutical Education and Research-Ahmedabad, Opposite Air Force Station, Palaj, Gandhinagar 382355, Gujarat, India
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Affiliation(s)
- H. Surekha Rani
- Institute of Genetics and Hospital for Genetic Diseases, O.U., Begumpet, Hyderabad 500 016, Andhra Pradesh, India
| | - G. Madhavi
- Institute of Genetics and Hospital for Genetic Diseases, O.U., Begumpet, Hyderabad 500 016, Andhra Pradesh, India
| | - B.M.V. Srikanth
- Institute of Genetics and Hospital for Genetic Diseases, O.U., Begumpet, Hyderabad 500 016, Andhra Pradesh, India
| | - P. Jharna
- Institute of Genetics and Hospital for Genetic Diseases, O.U., Begumpet, Hyderabad 500 016, Andhra Pradesh, India
| | - U.R.K. Rao
- Sri Deepti Rheumatology Centre, AC Guards, Hyderabad 500 004, Andhra Pradesh, India
| | - A. Jyothy
- Institute of Genetics and Hospital for Genetic Diseases, O.U., Begumpet, Hyderabad 500 016, Andhra Pradesh, India
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Hussain B, Reddy S, Prasad L, Madhavi G. Autologous blood transfusion in open heart surgeries under cardio-pulmonary bypass - Clinical appraisal. J Med Allied Sci 2017. [DOI: 10.5455/jmas.246306] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/03/2022] Open
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Haritha E, Roopan SM, Madhavi G, Elango G, Arunachalam P. Catunaregum spinosa capped Ag NPs and its photocatalytic application against amaranth toxic azo dye. J Mol Liq 2017. [DOI: 10.1016/j.molliq.2016.11.120] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Haritha E, Roopan SM, Madhavi G, Elango G, Al-Dhabi NA, Arasu MV. Green chemical approach towards the synthesis of SnO 2 NPs in argument with photocatalytic degradation of diazo dye and its kinetic studies. Journal of Photochemistry and Photobiology B: Biology 2016; 162:441-447. [DOI: 10.1016/j.jphotobiol.2016.07.010] [Citation(s) in RCA: 82] [Impact Index Per Article: 10.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2016] [Revised: 07/06/2016] [Accepted: 07/11/2016] [Indexed: 11/26/2022]
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Kothari R, Madhavi G. 851 Children & road safety- a multipronged approach. Inj Prev 2016. [DOI: 10.1136/injuryprev-2016-042156.851] [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: 11/04/2022]
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Veera Manohara Reddy Y, Prabhakara Rao V, Vijaya Bhaskar Reddy A, Lavanya M, Venu M, Lavanya M, Madhavi G. Determination of dopamine in presence of ascorbic acid and uric acid using poly (Spands Reagent) modified carbon paste electrode. Materials Science and Engineering: C 2015; 57:378-86. [DOI: 10.1016/j.msec.2015.08.005] [Citation(s) in RCA: 39] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/18/2015] [Revised: 07/18/2015] [Accepted: 08/04/2015] [Indexed: 10/23/2022]
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Gangadhara Reddy K, Madhavi G, Kumara Swamy B. Mobilized lipase enzymatic biosensor for the determination of Chlorfenvinphos and Malathion in contaminated water samples: A voltammetric study. J Mol Liq 2014. [DOI: 10.1016/j.molliq.2014.06.019] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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Venugopal N, Vijaya Bhaskar Reddy A, Madhavi G. Development and validation of a systematic UPLC-MS/MS method for simultaneous determination of three phenol impurities in ritonavir. J Pharm Biomed Anal 2013; 90:127-33. [PMID: 24366213 DOI: 10.1016/j.jpba.2013.11.029] [Citation(s) in RCA: 17] [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] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/11/2013] [Revised: 11/25/2013] [Accepted: 11/27/2013] [Indexed: 10/25/2022]
Abstract
A stability indicating gradient reverse phase UPLC-MS/MS method was developed and validated for the simultaneous determination of three phenol impurities in ritonavir drug substance. The chromatographic separation was performed on Acquity UPLC BEH C18 column (100 mm × 2.1 mm, 1.7 μm) using gradient elution of 0.05% ammonia in methanol and 5.0 mM ammonium acetate buffer (30:70, v/v) at a flow rate of 0.2 mL/min. Both negative and positive electrospray ionization (ESI) modes were operated simultaneously for the quantification of three phenol impurities. The total run time was 11 min, within which ritonavir and its three impurities were well separated. The developed method was validated as per ICH guidelines with respect to specificity, linearity, limit of detection, limit of quantification, accuracy, precision and robustness. The calibration curves showed a good linearity over the concentration range of 0.3-1.5 ppm for phenol and 0.1-1.5 ppm for both 4-nitrophenol and N-phenoxycarbonyl-L-valine (NPV). The determination coefficient obtained was >0.9998 in each case. The method had very low limit of detection (LOD) and limit of quantification (LOQ) and the accuracy lies between 97.8% and 103.2% for all the three phenol impurities. The developed method was successfully applied for five formulation batches of ritonavir to determine its phenol impurities.
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Affiliation(s)
- N Venugopal
- Department of Chemistry, Sri Venkateswara University, Tirupati 517502, A.P., India
| | | | - G Madhavi
- Department of Chemistry, Sri Venkateswara University, Tirupati 517502, A.P., India.
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Vijaya Bhaskar Reddy A, Venugopal N, Madhavi G, Gangadhara Reddy K, Madhavi V. A selective and sensitive UPLC–MS/MS approach for trace level quantification of four potential genotoxic impurities in zolmitriptan drug substance. J Pharm Biomed Anal 2013; 84:84-9. [DOI: 10.1016/j.jpba.2013.05.047] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2013] [Revised: 05/29/2013] [Accepted: 05/31/2013] [Indexed: 11/16/2022]
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Vamsi Krishna M, Dash RN, Jalachandra Reddy B, Venugopal P, Sandeep P, Madhavi G. Ion-pair RP-HPLC method for the estimation of eberconazole nitrate in bulk form and in pharmaceutical dosage forms. ACTA CHROMATOGR 2013. [DOI: 10.1556/achrom.25.2013.3.7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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Reddy KG, Madhavi G, Swamy BK, Reddy S, Reddy AB, Madhavi V. Electrochemical investigations of lipase enzyme activity inhibition by methyl parathion pesticide: Voltammetric studies. J Mol Liq 2013. [DOI: 10.1016/j.molliq.2012.12.032] [Citation(s) in RCA: 20] [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: 11/29/2022]
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Reddy AVB, Venugopal N, Madhavi G, Madhavi V, Reddy KG. Systematic Approach for Trace Level Quantification of 2-N-butyl-4-spirocyclopentane-2-imidazole-5-one Genotoxic Impurity in Irbesartan Using LC-MS/MS. Indian J Pharm Sci 2013; 75:501-6. [PMID: 24403649 PMCID: PMC3877510] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/02/2013] [Revised: 06/05/2013] [Accepted: 06/15/2013] [Indexed: 10/28/2022] Open
Abstract
2-N-butyl-4-spirocyclopentane-2-imidazoline-5-one has been highlighted as a potential genotoxic impurity in irbesartan. A sensitive LC-MS/MS method was developed and validated for the determination of 2-N-butyl-4-spirocyclopentane-2-imidazoline-5-one in irbesartan. Good separation between 2-N-butyl-4-spirocyclopentane-2-imidazoline-5-one and irbesartan was achieved with Symmetry C18 (100×4.6 mm, 3.5 μm) column using 65:35 v/v mixture of 0.1% formic acid and acetonitrile as mobile phase with a flow rate of 0.7 ml/min. The proposed method was specific, linear, accurate, and precise. The calibration curve shows good linearity over the concentration range of 0.1-2.0 μg/ml, which matches the range of limit of quantitation-20×limit of quantitation of estimated permitted level (1.0 μg/ml) of 2-N-butyl-4-spirocyclopentane-2-imidazoline-5-one. The method was validated as per International Conference on Harmonization guidelines and was able to quantitate 2-N-butyl-4-spirocyclopentane-2-imidazoline-5-one impurity at 1.0 μg/ml with respect to 2 mg/ml of irbesartan. 2-N-butyl-4-spirocyclopentane-2-imidazoline-5-one was not present in the three studied pure and formulation batches of irbesartan and the developed method was a good quality control tool for quantitation of 2-N-butyl-4-spirocyclopentane-2-imidazole-5-one at very low levels in irbesartan.
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Affiliation(s)
| | - N. Venugopal
- Department of Chemistry, Sri Venkateswara University, Tirupati-517 502, India
| | - G. Madhavi
- Department of Chemistry, Sri Venkateswara University, Tirupati-517 502, India,Address for correspondence E-mail:
| | - V. Madhavi
- Department of Chemistry, Sri Venkateswara University, Tirupati-517 502, India
| | - K. Gangadhara Reddy
- Department of Chemistry, Sri Venkateswara University, Tirupati-517 502, India
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Abstract
Cardiovascular complications are the major cause of morbidity and mortality in diabetic patients. An attempt has been made to evaluate the risk factors for coronary heart disease in type II diabetics. In the present study the levels of fasting and postprandial plasma glucose, total cholesterol, low density lipoproteins, triglycerides were high and the levels of high density lipoproteins were low in the type II diabetics compared to controls. The markers of free radical induced injury i.e. malondialdehyde and nitrite/nitrate were high while total antioxidant status a marker for antioxidant protection against reactive oxygen species was low in diabetics compared to controls. The study therefore suggests the importance of assessing these markers of oxidative stress and antioxidant capacity along with the other routine investigations in diabetic patients for initiating antioxidant therapy in addition to primary and secondary preventive measures to mitigate the devastating consequences of diabetes leading to coronary heart disease.
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Affiliation(s)
- H Surekha Rani
- Dept. of Cell Biology, Institute of Genetics amd Hospital for Genetic Diseases, Osmania University, Begumpet, 16 Hyderabad
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Venugopal N, Bhaskar Reddy AV, Gangadhar Reddy K, Madhavi V, Madhavi G. Method development and validation study for quantitative determination of 2-chloromethyl-3,4-dimethoxy pyridine hydrochloride a genotoxic impurity in pantoprazole active pharmaceutical ingredient (API) by LC/MS/MS. J Pharm Biomed Anal 2012; 70:592-7. [PMID: 22749172 DOI: 10.1016/j.jpba.2012.05.031] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/21/2012] [Revised: 04/18/2012] [Accepted: 05/23/2012] [Indexed: 11/18/2022]
Abstract
A sensitive and selective liquid chromatographic-tandem mass spectrometric (LC/MS/MS) method was developed and validated for the trace analysis (>1 ppm level) of 2-chloromethyl-3,4-dimethoxy pyridine hydrochloride a genotoxic impurity in pantoprazole sodium drug substances. LC/MS/MS analysis of 2-chloromethyl-3,4-dimethoxy pyridine hydrochloride was done on Hypersil BDS C18 (50 mm × 4.6 mm) 3 μm column and 10 mM ammonium acetate in 1000 mL of water was used as buffer. The mobile phase used was in the ratio of buffer-acetonitrile (79:21, v/v). The flow rate was 1.0 mL/min and elution was monitored at 210 nm. The method was validated as per International Conference on Harmonization (ICH) guidelines. LC/MS/MS is able to quantitate up to 0.3 ppm of 2-chloromethyl-3,4-dimethoxy pyridine hydrochloride.
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Affiliation(s)
- N Venugopal
- Department of Chemistry, Sri Venkateswara University, Tirupati, AP 517502, India
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Madhavi G, Satyanarayana N. Postoperative myocardial infarction after diagnostic video-assisted thoracoscopy and pleurodesis for catamenial pneumothorax: A unique case report. Indian J Anaesth 2010; 54:342-4. [PMID: 20882180 PMCID: PMC2943707 DOI: 10.4103/0019-5049.68388] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/04/2022] Open
Abstract
Myocardial infarction (MI) is uncommon in patients undergoing noncardiac surgery without a history of coronary artery disease. But, patients with compromised pulmonary function and coexisting anaemia superimposed by precipitating factors like prolonged hypotension and tachycardia can culminate in myocardial catastrophe even in the absence of risk factors. We are herewith reporting an unusual case of postoperative non-ST elevation MI without any pre-existing ischemic heart disease. A 39-year-old female patient who was submitted for diagnostic video-assisted thoracoscopy and chemical pleurodesis for recurrent pneumothorax developed postoperative MI. After review of all the factors, it was found that the patient developed Type 2 MI as a sequel to oxygen supply and demand mismatch secondary to hypoxia and prolonged hypotension. This was evident in the 12-lead electrocardiogram and was confirmed by elevated cardiac biomarkers and regional wall motion abnormality on echocardiography.
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Affiliation(s)
- G Madhavi
- Department of Anaesthesiology, Government General and Chest Hospital, Hyderabad, Andhra Pradesh, India
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Madhavi G, Raju LV, Madhu G, Raju VK. Challenge and change in delivering healthcare to India's needy. W V Med J 2010; 106:28-31. [PMID: 21928559] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
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Kandi S, Madhavi G. Emerging trends in the diagnosis of tuberculosis--RNTCP and beyond. J Indian Med Assoc 2010; 108:366-370. [PMID: 21121388] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [MESH Headings] [Subscribe] [Scholar Register] [Indexed: 05/30/2023]
Abstract
Though the Koch's bacillus was discovered 128 years ago, still there lies some dilemma in its diagnosis in certain clinical situations. Here in this article two basic approaches have been described for its diagnosis. One is the 'direct' approach in which detection of mycobacteria or its products is done, the other being 'indirect' approach, which includes measurements of humoral and cellular responses of the host against tuberculosis. 'Direct' methods include sputum smear microscopy, culture and molecular amplification methods. The 'indirect' methods include antibody detection, antigen defection, cellular immunity mediated tests and biochemical assays. All the methods have been narrated in a nutshell in this article.
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Kulkarni S, Madhavi G, Rao AR, Mohan KK. Side-chain alkylation of acetophenone with formaldehyde over alkali and alkaline earth metal ion modified basic zeolites. CATAL COMMUN 2008. [DOI: 10.1016/j.catcom.2007.07.030] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022] Open
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Ramakrishna Prasad M, Kamalakar G, Madhavi G, Kulkarni S, Raghavan K. An efficient synthesis of heterocyclic N-oxides over molecular sieve catalysts. ACTA ACUST UNITED AC 2002. [DOI: 10.1016/s1381-1169(02)00059-6] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
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Ramakrishna Prasad M, Kamalakar G, Madhavi G, Kulkarni SJ, Raghavan KV. An efficient synthesis of heterocyclic N-oxides over molecular sieve catalysts. Chem Commun (Camb) 2000. [DOI: 10.1039/b003926h] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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Yadav J, Reddy E, Madhavi G, Ramalingam T. FACILE SYNTHESIS OF 3-(THIOPHENOXY/PHENOXY)- 4-PHENYL-1,2-DIHYDRO-2-QUINOLINONES. HETEROCYCL COMMUN 2000. [DOI: 10.1515/hc.2000.6.5.403] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022] Open
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