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Yang N, Wei L, Teng Y, Yu P, Xiang C, Liu J. Cyclodextrin-based metal-organic frameworks transforming drug delivery. Eur J Med Chem 2024; 274:116546. [PMID: 38823266 DOI: 10.1016/j.ejmech.2024.116546] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2024] [Revised: 05/03/2024] [Accepted: 05/28/2024] [Indexed: 06/03/2024]
Abstract
Cyclodextrin-based metal-organic frameworks (CD-MOFs) are gaining traction in the realm of drug delivery due to their inherent versatility and potential to amplify drug efficacy, specificity, and safety. This article explores the predominant preparation techniques for CD-MOFs, encompassing methods like vapor diffusion, microwave-assisted, and ultrasound hydrothermal approaches. Native CD-MOFs present compelling advantages in drug delivery applications. They can enhance drug loading capacity, stability, solubility, and bioavailability by engaging in diverse interactions with drugs, including host-guest, hydrogen bonding, and electrostatic interactions. Beyond their inherent properties, CD-MOFs can be customized as drug carriers through two primary strategies: co-crystallization with functional components and surface post-modifications. These tailored modifications pave the way for controlled release manners. They allow for slow and sustained drug release, as well as responsive releases triggered by various factors such as pH levels, glutathione concentrations, or specific cations. Furthermore, CD-MOFs facilitate targeted delivery strategies, like pulmonary or laryngeal delivery, enhancing drug delivery precision. Overall, the adaptability and modifiability of CD-MOFs underscore their potential as a versatile platform for drug delivery, presenting tailored solutions that cater to diverse biomedical and industrial needs.
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Affiliation(s)
- Na Yang
- China International Science and Technology Cooperation Base of Food Nutrition/Safety and Medicinal Chemistry, Key Laboratory of Industrial Fermentation Microbiology of Ministry of Education, Tianjin Key Laboratory of Industry Microbiology, College of Biotechnology, Tianjin University of Science & Technology, 300457, Tianjin, China
| | - Lingling Wei
- China International Science and Technology Cooperation Base of Food Nutrition/Safety and Medicinal Chemistry, Key Laboratory of Industrial Fermentation Microbiology of Ministry of Education, Tianjin Key Laboratory of Industry Microbiology, College of Biotechnology, Tianjin University of Science & Technology, 300457, Tianjin, China
| | - Yuou Teng
- China International Science and Technology Cooperation Base of Food Nutrition/Safety and Medicinal Chemistry, Key Laboratory of Industrial Fermentation Microbiology of Ministry of Education, Tianjin Key Laboratory of Industry Microbiology, College of Biotechnology, Tianjin University of Science & Technology, 300457, Tianjin, China
| | - Peng Yu
- China International Science and Technology Cooperation Base of Food Nutrition/Safety and Medicinal Chemistry, Key Laboratory of Industrial Fermentation Microbiology of Ministry of Education, Tianjin Key Laboratory of Industry Microbiology, College of Biotechnology, Tianjin University of Science & Technology, 300457, Tianjin, China
| | - Cen Xiang
- China International Science and Technology Cooperation Base of Food Nutrition/Safety and Medicinal Chemistry, Key Laboratory of Industrial Fermentation Microbiology of Ministry of Education, Tianjin Key Laboratory of Industry Microbiology, College of Biotechnology, Tianjin University of Science & Technology, 300457, Tianjin, China.
| | - Jiang Liu
- Rosalind Franklin Institute, Harwell campus, OX11 0QS, Oxford, UK; Pharmacology Department, University of Oxford, Mansfield Road, OX1 3QT, Oxford, UK.
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2
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Nayak M, Patel CB, Mishra A, Singh R, Singh RK. Unveiling the Influence of Glutathione in Suppressing the Conversion of Aspirin to Salicylic Acid: A Fluorescence and DFT Study. J Fluoresc 2024; 34:1441-1451. [PMID: 38530561 DOI: 10.1007/s10895-024-03665-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2024] [Accepted: 03/11/2024] [Indexed: 03/28/2024]
Abstract
Aspirin is a commonly used nonsteroidal anti-inflammatory drug, associated with many adverse effects. The adverse effects of aspirin such as tinnitus, Reye's syndrome and gastrointestinal bleeding are caused due to conversion of aspirin into its active metabolite salicylic acid after oral intake. Glutathione is a naturally occurring antioxidant produced by the liver and nerve cells in the central nervous system. It helps to metabolize toxins, break down free radicles, and support immune function. This study aims to investigate and explore the possibility of inhibiting aspirin to salicylic acid conversion in presence of glutathione at a molecular level using spectroscopic techniques such as UV-Visible absorption, time-Resolved and time-dependent fluorescence and theoretical DFT/ TD-DFT calculations. The results of steady state fluorescence spectroscopy and time-dependent fluorescence indicated that the aspirin to salicylic acid conversion is considerably inhibited in presence of glutathione. Further, the results presented here might have significant clinical implications for individuals with variations in glutathione level.
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Affiliation(s)
- Monalisha Nayak
- Department of Physics, Institute of Science, Banaras Hindu University, Varanasi, 221005, India
| | - Chandan Bhai Patel
- Department of Physics, Institute of Science, Banaras Hindu University, Varanasi, 221005, India
| | - Anurag Mishra
- Department of Physics, Institute of Science, Banaras Hindu University, Varanasi, 221005, India
| | - Ranjana Singh
- Department of Physics, Institute of Science, Banaras Hindu University, Varanasi, 221005, India.
- Government Polytecnic Rajgrah, Mirzapur, Bathua, 231001, India.
| | - Ranjan K Singh
- Department of Physics, Institute of Science, Banaras Hindu University, Varanasi, 221005, India.
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3
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Au KM, Wilson JE, Ting JPY, Wang AZ. An injectable subcutaneous colon-specific immune niche for the treatment of ulcerative colitis. Nat Biomed Eng 2023:10.1038/s41551-023-01136-9. [PMID: 38049469 DOI: 10.1038/s41551-023-01136-9] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/05/2023] [Accepted: 10/14/2023] [Indexed: 12/06/2023]
Abstract
As a chronic autoinflammatory condition, ulcerative colitis is often managed via systemic immunosuppressants. Here we show, in three mouse models of established ulcerative colitis, that a subcutaneously injected colon-specific immunosuppressive niche consisting of colon epithelial cells, decellularized colon extracellular matrix and nanofibres functionalized with programmed death-ligand 1, CD86, a peptide mimic of transforming growth factor-beta 1, and the immunosuppressive small-molecule leflunomide, induced intestinal immunotolerance and reduced inflammation in the animals' lower gastrointestinal tract. The bioengineered colon-specific niche triggered autoreactive T cell anergy and polarized pro-inflammatory macrophages via multiple immunosuppressive pathways, and prevented the infiltration of immune cells into the colon's lamina propria, promoting the recovery of epithelial damage. The bioengineered niche also prevented colitis-associated colorectal cancer and eliminated immune-related colitis triggered by kinase inhibitors and immune checkpoint blockade.
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Affiliation(s)
- Kin Man Au
- Department of Radiation Oncology, University of Texas Southwestern Medical Center, Dallas, TX, USA.
| | - Justin E Wilson
- Lineberger Comprehensive Cancer Center, The University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
- Department of Microbiology, The University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Jenny P-Y Ting
- Lineberger Comprehensive Cancer Center, The University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
- Department of Microbiology, The University of North Carolina at Chapel Hill, Chapel Hill, NC, USA
| | - Andrew Z Wang
- Department of Radiation Oncology, University of Texas Southwestern Medical Center, Dallas, TX, USA.
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4
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Au KM, Tisch R, Wang AZ. Immune Checkpoint Ligand Bioengineered Schwann Cells as Antigen-Specific Therapy for Experimental Autoimmune Encephalomyelitis. ADVANCED MATERIALS (DEERFIELD BEACH, FLA.) 2022; 34:e2107392. [PMID: 34775659 PMCID: PMC8813901 DOI: 10.1002/adma.202107392] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/16/2021] [Revised: 11/08/2021] [Indexed: 05/05/2023]
Abstract
Failure to establish immune tolerance leads to the development of autoimmune disease. The ability to regulate autoreactive T cells without inducing systemic immunosuppression represents a major challenge in the development of new strategies to treat autoimmune disease. Here, a translational method for bioengineering programmed death-ligand 1 (PD-L1)- and cluster of differentiation 86 (CD86)-functionalized mouse Schwann cells (SCs) to prevent and ameliorate multiple sclerosis (MS) in established mouse models of chronic and relapsing-remitting experimental autoimmune encephalomyelitis (EAE) is described. It is shown that the intravenous (i.v.) administration of immune checkpoint ligand functionalized mouse SCs modifies the course of disease and ameliorates EAE. Further, it is found that such bioengineered mouse SCs inhibit the differentiation of myelin-specific helper T cells into pathogenic T helper type-1 (Th 1) and type-17 (Th 17) cells, promote the development of tolerogenic myelin-specific regulatory T (Treg ) cells, and resolve inflammatory central nervous system microenvironments without inducing systemic immunosuppression.
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Affiliation(s)
- Kin Man Au
- Laboratory of Nano- and Translational Medicine, Carolina Center for Cancer Nanotechnology Excellence, Carolina Institute of Nanomedicine, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA
- Department of Radiation Oncology, Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA
- Department of Radiation Oncology, University of Texas Southwestern Medical Center, Dallas, TX, 75230, USA
| | - Roland Tisch
- Department of Microbiology and Immunology School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA
- Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA
| | - Andrew Z Wang
- Laboratory of Nano- and Translational Medicine, Carolina Center for Cancer Nanotechnology Excellence, Carolina Institute of Nanomedicine, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA
- Department of Radiation Oncology, Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, 27599, USA
- Department of Radiation Oncology, University of Texas Southwestern Medical Center, Dallas, TX, 75230, USA
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5
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Alamri RD, Elmeligy MA, Albalawi GA, Alquayr SM, Alsubhi SS, El-Ghaiesh SH. Leflunomide an immunomodulator with antineoplastic and antiviral potentials but drug-induced liver injury: A comprehensive review. Int Immunopharmacol 2021; 93:107398. [PMID: 33571819 PMCID: PMC7869628 DOI: 10.1016/j.intimp.2021.107398] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/31/2020] [Revised: 01/11/2021] [Accepted: 01/11/2021] [Indexed: 12/11/2022]
Abstract
Leflunomide (LF) represents the prototype member of dihydroorotate dehydrogenase (DHODH) enzyme inhibitors. DHODH is a mitochondrial inner membrane enzyme responsible for catalytic conversion of dihydroorotate into orotate, a rate-limiting step in the de novo synthesis of the pyrimidine nucleotides. LF produces cellular depletion of pyrimidine nucleotides required for cell growth and proliferation. Based on the affected cells the outcome can be attainable as immunosuppression, antiproliferative, and/or the recently gained attention of the antiviral potentials of LF and its new congeners. Also, protein tyrosine kinase inhibition is an additional mechanistic benefit of LF, which inhibits immunological events such as cellular expansion and immunoglobulin production with an enhanced release of immunosuppressant cytokines. LF is approved for the treatment of autoimmune arthritis of rheumatoid and psoriatic pathogenesis. Also, LF has been used off-label for the treatment of relapsing-remitting multiple sclerosis. However, LF antiviral activity is repurposed and under investigation with related compounds under a phase-I trial as a SARS CoV-2 antiviral in cases with COVID-19. Despite success in improving patients' mobility and reducing joint destruction, reported events of LF-induced liver injury necessitated regulatory precautions. LF should not be used in patients with hepatic impairment or in combination with drugs elaborating a burden on the liver without regular monitoring of liver enzymes and serum bilirubin as safety biomarkers. This study aims to review the pharmacological and safety profile of LF with a focus on the LF-induced hepatic injury from the perspective of pathophysiology and possible protective agents.
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Affiliation(s)
- Raghad D Alamri
- Faculty of Medicine, University of Tabuk, Tabuk 47713, Saudi Arabia
| | | | | | - Sarah M Alquayr
- Faculty of Medicine, University of Tabuk, Tabuk 47713, Saudi Arabia
| | | | - Sabah H El-Ghaiesh
- Deaprtment of Pharmacology, Faculty of Medicine, Tanta University, Tanta 31527, Egypt; Department of Pharmacology, Faculty of Medicine, University of Tabuk, Tabuk 47713, Saudi Arabia.
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Hubackova S, Davidova E, Boukalova S, Kovarova J, Bajzikova M, Coelho A, Terp MG, Ditzel HJ, Rohlena J, Neuzil J. Replication and ribosomal stress induced by targeting pyrimidine synthesis and cellular checkpoints suppress p53-deficient tumors. Cell Death Dis 2020; 11:110. [PMID: 32034120 PMCID: PMC7007433 DOI: 10.1038/s41419-020-2224-7] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/16/2019] [Revised: 11/26/2019] [Accepted: 11/27/2019] [Indexed: 12/22/2022]
Abstract
p53-mutated tumors often exhibit increased resistance to standard chemotherapy and enhanced metastatic potential. Here we demonstrate that inhibition of dihydroorotate dehydrogenase (DHODH), a key enzyme of the de novo pyrimidine synthesis pathway, effectively decreases proliferation of cancer cells via induction of replication and ribosomal stress in a p53- and checkpoint kinase 1 (Chk1)-dependent manner. Mechanistically, a block in replication and ribosomal biogenesis result in p53 activation paralleled by accumulation of replication forks that activate the ataxia telangiectasia and Rad3-related kinase/Chk1 pathway, both of which lead to cell cycle arrest. Since in the absence of functional p53 the cell cycle arrest fully depends on Chk1, combined DHODH/Chk1 inhibition in p53-dysfunctional cancer cells induces aberrant cell cycle re-entry and erroneous mitosis, resulting in massive cell death. Combined DHODH/Chk1 inhibition effectively suppresses p53-mutated tumors and their metastasis, and therefore presents a promising therapeutic strategy for p53-mutated cancers.
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Affiliation(s)
- Sona Hubackova
- Laboratory of Molecular Therapy, Institute of Biotechnology, Czech Academy of Sciences, Prague-West, 252 50, Czech Republic.
| | - Eliska Davidova
- Laboratory of Molecular Therapy, Institute of Biotechnology, Czech Academy of Sciences, Prague-West, 252 50, Czech Republic.,Faculty of Science, Charles University, Prague, Czech Republic
| | - Stepana Boukalova
- Laboratory of Molecular Therapy, Institute of Biotechnology, Czech Academy of Sciences, Prague-West, 252 50, Czech Republic
| | - Jaromira Kovarova
- Laboratory of Molecular Therapy, Institute of Biotechnology, Czech Academy of Sciences, Prague-West, 252 50, Czech Republic
| | - Martina Bajzikova
- Laboratory of Molecular Therapy, Institute of Biotechnology, Czech Academy of Sciences, Prague-West, 252 50, Czech Republic
| | - Ana Coelho
- Laboratory of Molecular Therapy, Institute of Biotechnology, Czech Academy of Sciences, Prague-West, 252 50, Czech Republic
| | - Mikkel G Terp
- Department of Cancer and Inflammation Research, Institute of Molecular Medicine, University of Southern Denmark, 5000, Odense, Denmark
| | - Henrik J Ditzel
- Department of Cancer and Inflammation Research, Institute of Molecular Medicine, University of Southern Denmark, 5000, Odense, Denmark.,Academy of Geriatric Cancer Research (AgeCare), Department of Oncology, Odense University Hospital, 5000, Odense, Denmark
| | - Jakub Rohlena
- Laboratory of Molecular Therapy, Institute of Biotechnology, Czech Academy of Sciences, Prague-West, 252 50, Czech Republic
| | - Jiri Neuzil
- Laboratory of Molecular Therapy, Institute of Biotechnology, Czech Academy of Sciences, Prague-West, 252 50, Czech Republic. .,School of Medical Science, Griffith University, Southport, QLD, 4222, Australia.
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7
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Kritskiy I, Volkova T, Surov A, Terekhova I. γ-Cyclodextrin-metal organic frameworks as efficient microcontainers for encapsulation of leflunomide and acceleration of its transformation into teriflunomide. Carbohydr Polym 2019; 216:224-230. [DOI: 10.1016/j.carbpol.2019.04.037] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/16/2019] [Revised: 03/18/2019] [Accepted: 04/08/2019] [Indexed: 11/29/2022]
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8
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Gangopadhyay D, Das M, Singh KK, Sharma P, Singh RK, Tandon P. Monitoring the in Vitro Thiazolidine Ring Formation of Antioxidant Drug N-Acetyl-l-cysteine at Basic pH and Detection of Reaction Intermediates: A Raman Spectroscopic and Ab Initio Study. J Phys Chem B 2018; 122:10306-10314. [PMID: 30351107 DOI: 10.1021/acs.jpcb.8b08512] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
The important cyclization reaction of antioxidant drug N-acetyl-l-cysteine (NAC) has been monitored in vitro at basic pH with the help of time series Raman spectroscopy. The thiazoline ring formation of NAC at acidic pH is a well-known reaction and has been studied extensively. However, the formation of a thiazolidine ring from NAC at basic pH has not been investigated precisely till date. The effect of basicity of the medium on the rate of cyclization has been investigated by studying the reaction at five different basic pH values. Raman signatures of cyclization have been observed with the passage of time and are found to appear faster as the basicity of the medium increases. Ab initio calculations have been done to understand the plausible mechanism of the reaction at basic pH. It is observed that formation of a thiazolidine ring from NAC occurs primarily in four steps, which involve proton abstraction from the thiol (SH) group of NAC and subsequent formation of an S-C bond by a nucleophilic attack of the C-S group on the protonated C-O-H group in NAC. Correlation of the theoretically calculated results with experimental Raman spectral analysis has led to a detailed and proper understanding of this important biochemical reaction.
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Affiliation(s)
| | - Moumita Das
- Department of Physics , University of Lucknow , Lucknow 226007 , India
| | | | - Poornima Sharma
- Department of Physics , University of Lucknow , Lucknow 226007 , India
| | - Ranjan K Singh
- Department of Physics , Banaras Hindu University , Varanasi 221005 , India
| | - Poonam Tandon
- Department of Physics , University of Lucknow , Lucknow 226007 , India
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9
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Singh R, Tiwari MK, Gangopadhyay D, Mishra PC, Mishra H, Srivastava A, Singh RK. Detection and monitoring of in vitro formation of salicylic acid from aspirin using fluorescence spectroscopic technique and DFT calculations. JOURNAL OF PHOTOCHEMISTRY AND PHOTOBIOLOGY B-BIOLOGY 2018; 189:292-297. [PMID: 30445361 DOI: 10.1016/j.jphotobiol.2018.11.004] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/20/2018] [Revised: 08/23/2018] [Accepted: 11/06/2018] [Indexed: 10/27/2022]
Abstract
Acetylsalicylic acid commonly termed as aspirin (AS) is a well known antipyretic and anti-inflammatory drug which can also be used to reduce death risks due to heart attack. In addition to this, it also exhibits some adverse effect such as gastrointestinal, tinnitus, Reye's syndrome. The side effects of AS such as gastrointestinal ulcer, tinnitus and Reye's syndrome are caused due to conversion of AS into its active metabolite salicylic acid (SAL). Conversion of AS into SAL has been investigated generally at basic pH. Since the pH of Gastrointestinal tract is on average neutral ranging from 6.5-7.4. Therefore in the present research work, in vitro conversion of AS to SAL was detected at neutral pH in both aqueous medium and human blood serum samples by time series fluorescence measurements and DFT study. The SAL obtained from AS at neutral pH was observed to be stable for ~ 6 and ~ 4 days in aqueous medium and blood serum, respectively. The mechanism of conversion of AS into SAL was investigated using the transition state theory employing density functional theory (DFT). On the basis of DFT calculation the in vitro formation of SAL from AS at neutral pH was found to involve two intermediate transition states.
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Affiliation(s)
- Ranjana Singh
- Department of Physics, Institute of Science, Banaras Hindu University, Varanasi 221005, India; Department of Physics, Central University of South Bihar, Panchanpur, Gaya, India.
| | - Manish Kumar Tiwari
- Department of Physics, Institute of Science, Banaras Hindu University, Varanasi 221005, India
| | | | - Phool Chand Mishra
- Department of Physics, Institute of Science, Banaras Hindu University, Varanasi 221005, India
| | - Hirdyesh Mishra
- Department of Physics, MMV, Institute of Science, Banaras Hindu University, Varanasi 221005, India.
| | - Anchal Srivastava
- Department of Physics, Institute of Science, Banaras Hindu University, Varanasi 221005, India
| | - Ranjan K Singh
- Department of Physics, Institute of Science, Banaras Hindu University, Varanasi 221005, India.
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10
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Xu F, Kang WF, Wang XN, Zhu YY, Chen SX, Kong YJ, Fang SM. Hypervalent iodine-induced formation of 3,5-disubstituted isoxazoles via [3 + 2] cycloaddition of diynes with aldoximes. MONATSHEFTE FUR CHEMIE 2017. [DOI: 10.1007/s00706-016-1907-3] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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11
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Gangopadhyay D, Sharma P, Nandi R, Das M, Ghosh S, Singh RK. In vitro concentration dependent detection of creatinine: a surface enhanced Raman scattering and fluorescence study. RSC Adv 2016. [DOI: 10.1039/c6ra22886k] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023] Open
Abstract
(a) SERS spectra and (b) fluorescence spectra of Jaffe complex showing consistent variation relatable to the concentration of CRN.
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Affiliation(s)
| | - Poornima Sharma
- Department of Physics
- Banaras Hindu University
- Varanasi-221005
- India
| | - Rajib Nandi
- Department of Physics
- Banaras Hindu University
- Varanasi-221005
- India
| | - Moumita Das
- Department of Physics
- Banaras Hindu University
- Varanasi-221005
- India
| | - Surajit Ghosh
- Department of Physics
- Banaras Hindu University
- Varanasi-221005
- India
| | - Ranjan K. Singh
- Department of Physics
- Banaras Hindu University
- Varanasi-221005
- India
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