51
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Zhang Z, Kwok RTK, Yu Y, Tang BZ, Ng KM. Aggregation-induced emission luminogen-based fluorescence detection of hypoxanthine: a probe for biomedical diagnosis of energy metabolism-related conditions. J Mater Chem B 2018; 6:4575-4578. [DOI: 10.1039/c8tb00803e] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Highly sensitive and specific detection of hypoxanthine based on an aggregation-induced emission fluorescent probe is developed for energy metabolism-related diagnostics.
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Affiliation(s)
- Zhiling Zhang
- Department of Chemical and Biological Engineering
- The Hong Kong University of Science and Technology
- Kowloon
- China
| | - Ryan T. K. Kwok
- Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction
- Department of Chemistry
- The Hong Kong University of Science and Technology
- Kowloon
- China
| | - Yong Yu
- Department of Chemical and Biological Engineering
- The Hong Kong University of Science and Technology
- Kowloon
- China
| | - Ben Zhong Tang
- Hong Kong Branch of Chinese National Engineering Research Center for Tissue Restoration and Reconstruction
- Department of Chemistry
- The Hong Kong University of Science and Technology
- Kowloon
- China
| | - Ka Ming Ng
- Department of Chemical and Biological Engineering
- The Hong Kong University of Science and Technology
- Kowloon
- China
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52
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Uricase based fluorometric determination of uric acid based on the use of graphene quantum dot@silver core-shell nanocomposites. Mikrochim Acta 2017; 185:63. [DOI: 10.1007/s00604-017-2614-4] [Citation(s) in RCA: 23] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/09/2017] [Accepted: 12/06/2017] [Indexed: 12/12/2022]
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53
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Albelda JA, Uzunoglu A, Santos GNC, Stanciu LA. Graphene-titanium dioxide nanocomposite based hypoxanthine sensor for assessment of meat freshness. Biosens Bioelectron 2017; 89:518-524. [DOI: 10.1016/j.bios.2016.03.041] [Citation(s) in RCA: 63] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2015] [Revised: 03/03/2016] [Accepted: 03/17/2016] [Indexed: 11/29/2022]
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54
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Wang M, Zheng Z, Liu J, Wang C. Pt-Pd Bimetallic Nanoparticles Decorated Nanoporous Graphene as a Catalytic Amplification Platform for Electrochemical Detection of Xanthine. ELECTROANAL 2017. [DOI: 10.1002/elan.201600783] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/10/2022]
Affiliation(s)
- Mei Wang
- College of Pharmacy; Ningxia Medical University; 750004 Yinchuan China
| | - Zhixiang Zheng
- College of Pharmacy; Ningxia Medical University; 750004 Yinchuan China
| | - Juanjuan Liu
- College of Pharmacy; Ningxia Medical University; 750004 Yinchuan China
| | - Chunming Wang
- College of Chemistry and Chemical Engineering; Lanzhou University; 730001 Lanzhou China
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55
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Qin Q, Bai X, Hua Z. Electropolymerization of a conductive β-cyclodextrin polymer on reduced graphene oxide modified screen-printed electrode for simultaneous determination of ascorbic acid, dopamine and uric acid. J Electroanal Chem (Lausanne) 2016. [DOI: 10.1016/j.jelechem.2016.10.004] [Citation(s) in RCA: 53] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/22/2022]
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56
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Simultaneous Determination of Uric Acid, Xanthine and Hypoxanthine in Human Plasma and Serum by HPLC–UV: Uric Acid Metabolism Tracking. Chromatographia 2016. [DOI: 10.1007/s10337-016-3208-8] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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57
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Sensitive electrochemical sensor for simultaneous determination of uric acid and xanthine in human biological fluids based on the nano-boron doped ceria modified glassy carbon paste electrode. J Electroanal Chem (Lausanne) 2016. [DOI: 10.1016/j.jelechem.2016.09.016] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/19/2022]
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58
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Quantitative analysis of endogenous compounds. J Pharm Biomed Anal 2016; 128:426-437. [DOI: 10.1016/j.jpba.2016.06.017] [Citation(s) in RCA: 125] [Impact Index Per Article: 15.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/22/2016] [Revised: 06/08/2016] [Accepted: 06/09/2016] [Indexed: 01/19/2023]
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59
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Wang H, Lu Q, Hou Y, Liu Y, Zhang Y. High fluorescence S, N co-doped carbon dots as an ultra-sensitive fluorescent probe for the determination of uric acid. Talanta 2016; 155:62-9. [DOI: 10.1016/j.talanta.2016.04.020] [Citation(s) in RCA: 91] [Impact Index Per Article: 11.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2016] [Revised: 04/08/2016] [Accepted: 04/09/2016] [Indexed: 12/29/2022]
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60
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Komers R, Xu B, Schneider J, Oyama TT. Effects of xanthine oxidase inhibition with febuxostat on the development of nephropathy in experimental type 2 diabetes. Br J Pharmacol 2016; 173:2573-88. [PMID: 27238746 DOI: 10.1111/bph.13527] [Citation(s) in RCA: 30] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/12/2015] [Revised: 05/11/2016] [Accepted: 05/12/2016] [Indexed: 12/22/2022] Open
Abstract
BACKGROUND AND PURPOSE Elevated serum uric acid (UA) is a risk factor for the development of kidney disease. Inhibitors of xanthine oxidase (XOi), an enzyme involved in UA synthesis, have protective effects at early stages of experimental diabetic nephropathy (DN). However, long-term effects of XOi in models of DN remain to be determined. EXPERIMENTAL APPROACH The development of albuminuria, renal structure and molecular markers of DN were studied in type 2 diabetic Zucker obese (ZO) rats treated for 18 weeks with the XOi febuxostat and compared with vehicle-treated ZO rats, ZO rats treated with enalapril or a combination of both agents, and lean Zucker rats without metabolic defects. RESULTS Febuxostat normalized serum UA and attenuated the development of albuminuria, renal structural changes, with no significant effects on BP, metabolic control or systemic markers of oxidative stress (OS). Most of these actions were comparable with those of enalapril. Combination treatment induced marked decreases in BP and was more effective in ameliorating structural changes, expression of profibrotic genes and systemic OS than either monotherapy. Febuxostat attenuated renal protein expression of TGF-ß, CTGF, collagen 4, mesenchymal markers (FSP1 and vimentin) and a tissue marker of OS nitrotyrosine. Moreover, febuxostat attenuated TGF-ß- and S100B-induced increased expression of fibrogenic molecules in renal tubular cells in vitro in UA-free media in an Akt kinase-dependent manner. CONCLUSIONS AND IMPLICATIONS Febuxostat is protective and enhances the actions of enalapril in experimental DN. Multiple mechanisms might be involved, such as a reduction of UA, renal OS and inhibition of profibrotic signalling.
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Affiliation(s)
- Radko Komers
- Department of Medicine, Division of Nephrology and Hypertension, Oregon Health and Science University, Portland, OR, USA
| | - Bei Xu
- Department of Medicine, Division of Nephrology and Hypertension, Oregon Health and Science University, Portland, OR, USA
| | - Jennifer Schneider
- Department of Medicine, Division of Nephrology and Hypertension, Oregon Health and Science University, Portland, OR, USA
| | - Terry T Oyama
- Department of Medicine, Division of Nephrology and Hypertension, Oregon Health and Science University, Portland, OR, USA
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61
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Quifer-Rada P, Choy YY, Calvert CC, Waterhouse AL, Lamuela-Raventos RM. Use of metabolomics and lipidomics to evaluate the hypocholestreolemic effect of Proanthocyanidins from grape seed in a pig model. Mol Nutr Food Res 2016; 60:2219-2227. [PMID: 27240545 DOI: 10.1002/mnfr.201600190] [Citation(s) in RCA: 18] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/02/2016] [Revised: 05/19/2016] [Accepted: 05/20/2016] [Indexed: 12/12/2022]
Abstract
SCOPE This work aims to evaluate changes in the fecal metabolomic profile due to grape seed extract (GSE) intake by untargeted and targeted analysis using high resolution mass spectrometry in conjunction with multivariate statistics. METHODS AND RESULTS An intervention study with six crossbred female pigs was performed. The pigs followed a standard diet for 3 days, then they were fed with a supplemented diet containing 1% (w/w) of MegaNatural® Gold grape seed extract for 6 days. Fresh pig fecal samples were collected daily. A combination of untargeted high resolution mass spectrometry, multivariate analysis (PLS-DA), data-dependent MS/MS scan, and accurate mass database matching was used to measure the effect of the treatment on fecal composition. The resultant PLS-DA models showed a good discrimination among classes with great robustness and predictability. A total of 14 metabolites related to the GSE consumption were identified including biliary acid, dicarboxylic fatty acid, cholesterol metabolites, purine metabolites, and eicosanoid metabolites among others. Moreover, targeted metabolomics using GC-MS showed that cholesterol and its metabolites fecal excretion was increased due to the proanthocyanidins from grape seed extract. CONCLUSION The results show that oligomeric procyanidins from GSE modifies bile acid and steroid excretion, which could exert a hypocholesterolemic effect.
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Affiliation(s)
- Paola Quifer-Rada
- Department of Nutrition, Food Science and Gastronomy -XARTA-INSA-UB, School of Pharmacy and Food Science, University of Barcelona, Barcelona, Spain.,CIBEROBN del Instituto de Salud Carlos III, ISCIII, Spain
| | - Ying Yng Choy
- Department of Viticulture and Enology, University of California, Davis, CA, USA
| | | | - Andrew L Waterhouse
- Department of Viticulture and Enology, University of California, Davis, CA, USA
| | - Rosa M Lamuela-Raventos
- Department of Nutrition, Food Science and Gastronomy -XARTA-INSA-UB, School of Pharmacy and Food Science, University of Barcelona, Barcelona, Spain. .,CIBEROBN del Instituto de Salud Carlos III, ISCIII, Spain.
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62
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Yang J, Yuan Y, Hua Z. Density functional theory study of interaction of graphene with hypoxanthine, xanthine, and uric acid. Mol Phys 2016. [DOI: 10.1080/00268976.2016.1189009] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Affiliation(s)
- Junwei Yang
- Department of Mathematics and Physics, Shanghai Dianji University, Shanghai, China
| | - Yanhong Yuan
- Department of Mathematics and Physics, Shanghai Dianji University, Shanghai, China
| | - Zhao Hua
- Department of Mathematics and Physics, Shanghai Dianji University, Shanghai, China
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63
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Li XL, Shi Q, Jin W, Li G, Todoroki K, Mizuno H, Toyo'oka T, Min JZ. Uric acid quantification in fingernail of gout patients and healthy volunteers using HPLC-UV. Biomed Chromatogr 2016; 30:1338-42. [PMID: 26787501 DOI: 10.1002/bmc.3687] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/26/2015] [Revised: 11/30/2015] [Accepted: 12/25/2015] [Indexed: 02/06/2023]
Abstract
The presence of elevated uric acid (UA) levels is a sign of gout, that is, hyperuricemia. In this study the monitoring of the UA levels in less-invasive biological samples, such as the human fingernail, is suggested for the diagnosis and therapy of gout. Twenty-six healthy volunteers (HV) and 22 gout patients (GP) were studied. The UA was extracted from human fingernail samples, then separated on an Inertsil ODS-3 column (250 × 4.6 mm i.d., 4.0 μm, GL Sciences) by isocratic elution using methanol-74 mm phosphate buffer (pH 2.2) 2:98 (v/v). A UV detector was used to monitor the samples at 284 nm. Using the developed method, different UA concentrations were found in the GP and HV. When comparing the concentrations from GP with those from HV, a statistically significant correlation was observed between the UA (p < 0.01). In this study, the UA was confirmed as a potential biomarker for the diagnosis and therapy of gout. We have developed a novel sensitive, and simple method for the determination of UA in the fingernails of GP and HV. The human fingernail may serve as a noninvasive biosample for the diagnosis of gout. Copyright © 2016 John Wiley & Sons, Ltd.
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Affiliation(s)
- Xi-Ling Li
- Key Laboratory for Natural Resource of Changbai Mountain and Functional Molecules, Ministry of Education, College of Pharmacy, Yanbian University, Yanji, 133002, Jilin Province, China
| | - Qing Shi
- Department of Pharmacy, Affiliated Western Hospital, Yanbian University, Department of Endocrinology, Affiliated Hospital of Yanbian University, Yanji, 133000, Jilin, Province, China
| | - Wenlong Jin
- Department of Pharmacy, Affiliated Western Hospital, Yanbian University, Department of Endocrinology, Affiliated Hospital of Yanbian University, Yanji, 133000, Jilin, Province, China
| | - Gao Li
- Key Laboratory for Natural Resource of Changbai Mountain and Functional Molecules, Ministry of Education, College of Pharmacy, Yanbian University, Yanji, 133002, Jilin Province, China
| | - Kenichiro Todoroki
- Laboratory of Analytical and Bio-Analytical Chemistry, School of Pharmaceutical Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka, 422-8526, Japan
| | - Hajime Mizuno
- Laboratory of Analytical and Bio-Analytical Chemistry, School of Pharmaceutical Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka, 422-8526, Japan
| | - Toshimasa Toyo'oka
- Laboratory of Analytical and Bio-Analytical Chemistry, School of Pharmaceutical Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka, 422-8526, Japan
| | - Jun Zhe Min
- Key Laboratory for Natural Resource of Changbai Mountain and Functional Molecules, Ministry of Education, College of Pharmacy, Yanbian University, Yanji, 133002, Jilin Province, China.,Laboratory of Analytical and Bio-Analytical Chemistry, School of Pharmaceutical Sciences, University of Shizuoka, 52-1 Yada, Suruga-ku, Shizuoka, 422-8526, Japan
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64
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Omar MA, Mohamed AMI, Derayea SM, Hammad MA, Mohamed AA. Specific and highly sensitive spectrofluorimetric method for determination of febuxostat in its tablets and real human plasma. Application to stability studies. RSC Adv 2016. [DOI: 10.1039/c6ra11246c] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/30/2023] Open
Abstract
A simple, rapid, specific and highly sensitive spectrofluorimetric method has been developed for determination of febuxostat (FEB) in its tablets and real human plasma.
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Affiliation(s)
- Mahmoud A. Omar
- Analytical Chemistry Department
- Faculty of Pharmacy
- Minia University
- Minia
- Egypt
| | | | - Sayed M. Derayea
- Analytical Chemistry Department
- Faculty of Pharmacy
- Minia University
- Minia
- Egypt
| | - Mohamed A. Hammad
- Analytical Chemistry Department
- Faculty of Pharmacy
- Minia University
- Minia
- Egypt
| | - Abobakr A. Mohamed
- Analytical Chemistry Department
- Faculty of Pharmacy
- Minia University
- Minia
- Egypt
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65
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Shang D, Ni J, Gao X, Li C, Lin X, Wang Z, Du N, Li S, Xing Y. Various structures of complexes fabricated using transition metals and triazole ligands and their inhibition effects on xanthine luminescence. NEW J CHEM 2016. [DOI: 10.1039/c6nj01503d] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
The interaction between novel transition metal complexes and xanthine luminescence was studied for the first time.
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Affiliation(s)
- Di Shang
- College of Chemistry and Chemical Engineering
- Liaoning Normal University
- Dalian City
- P. R. China
| | - Juechen Ni
- College of Chemistry and Chemical Engineering
- Liaoning Normal University
- Dalian City
- P. R. China
| | - Xinyu Gao
- College of Physics and Electronic Technology
- Liaoning Normal University
- Dalian
- P. R. China
| | - Chengren Li
- College of Physics and Electronic Technology
- Liaoning Normal University
- Dalian
- P. R. China
| | - Xiaomeng Lin
- College of Chemistry and Chemical Engineering
- Liaoning Normal University
- Dalian City
- P. R. China
| | - Zhinan Wang
- College of Chemistry and Chemical Engineering
- Liaoning Normal University
- Dalian City
- P. R. China
| | - Ning Du
- College of Chemistry and Chemical Engineering
- Liaoning Normal University
- Dalian City
- P. R. China
| | - Shuang Li
- College of Chemistry and Chemical Engineering
- Liaoning Normal University
- Dalian City
- P. R. China
| | - Yongheng Xing
- College of Chemistry and Chemical Engineering
- Liaoning Normal University
- Dalian City
- P. R. China
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66
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Simultaneous determination of uric acid, xanthine and hypoxanthine based on sulfonic groups functionalized nitrogen-doped graphene. J Electroanal Chem (Lausanne) 2015. [DOI: 10.1016/j.jelechem.2015.08.008] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/04/2023]
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67
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Lan D, Zhang L. Electrochemical synthesis of a novel purine-based polymer and its use for the simultaneous determination of dopamine, uric acid, xanthine and hypoxanthine. J Electroanal Chem (Lausanne) 2015. [DOI: 10.1016/j.jelechem.2015.09.018] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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68
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Qiao YC, Li J, Li Y, Li QM. The Influencing of Preanodized Inlaying Ultrathin Carbon Paste Electrode on the Oxidation for the Xanthine and Hypoxanthine by the Hydrogen Bond. J CHIN CHEM SOC-TAIP 2015. [DOI: 10.1002/jccs.201500253] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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69
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Li XL, Li G, Jiang YZ, Kang D, Jin CH, Shi Q, Jin T, Inoue K, Todoroki K, Toyo'oka T, Min JZ. Human nails metabolite analysis: A rapid and simple method for quantification of uric acid in human fingernail by high-performance liquid chromatography with UV-detection. J Chromatogr B Analyt Technol Biomed Life Sci 2015; 1002:394-8. [DOI: 10.1016/j.jchromb.2015.08.044] [Citation(s) in RCA: 49] [Impact Index Per Article: 5.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/07/2015] [Revised: 08/04/2015] [Accepted: 08/27/2015] [Indexed: 01/24/2023]
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70
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Kanďár R. The ratio of oxidized and reduced forms of selected antioxidants as a possible marker of oxidative stress in humans. Biomed Chromatogr 2015; 30:13-28. [PMID: 26053056 DOI: 10.1002/bmc.3529] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2014] [Revised: 05/20/2015] [Accepted: 05/29/2015] [Indexed: 02/04/2023]
Abstract
Oxidative stress is an imbalance between reactive oxygen species exposure and the ability of organisms to detoxify the reactive intermediates and to repair the oxidative damage of biologically important molecules. Many clinical studies of oxidative stress unfortunately provide conflicting and contradictory results. The ability of antioxidant systems to adequately respond to oxidative stress can be used in laboratory diagnostics. In the present review, methods using the ratio of reduced and oxidized forms of uric acid, ascorbic acid, glutathione and coenzyme Q10 as suitable indicators of oxidative stress are discussed. From the mentioned publications it is evident that suitable sample preparation prior to analysis is crucial.
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Affiliation(s)
- Roman Kanďár
- Department of Biological and Biochemical Sciences, Faculty of Chemical Technology, University of Pardubice, Pardubice, Czech Republic
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71
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Selective removal of ATP degradation products from food matrices II: Rapid screening of hypoxanthine and inosine by molecularly imprinted matrix solid-phase dispersion for evaluation of fish freshness. Talanta 2015; 135:58-66. [PMID: 25640126 DOI: 10.1016/j.talanta.2014.12.037] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2014] [Revised: 12/19/2014] [Accepted: 12/23/2014] [Indexed: 11/24/2022]
Abstract
A water compatible molecularly imprinted polymer (MIP), synthesized using theophylline (TPH) as dummy-template and acrylamide (AM) as functional monomer, has been employed as supporting material in matrix solid-phase dispersion combined with ultra performance liquid chromatography-photodiode array detection (MSPD-UPLC-PDA) for selective determination of adenosine triphosphate (ATP) derivatives in fish samples. ATP degradation products are used as freshness index for assessment of fish quality. The solid sample was directly blended with MIP in MSPD procedure resulting in sample disruption and subsequent adsorption of the compounds on the MIP. By using n-hexane and ammonium hydroxide aqueous solution at pH 9 as the washing and elution solvent, respectively, satisfactory recoveries and clean chromatograms have been obtained. Good linearity for hypoxanthine (HYP) and inosine (INO) has been observed with correlation coefficients (R(2)) of 0.9987 and 0.9986, respectively. The recoveries of the two ATP derivatives at three different spiked levels ranged from 106.5% to 113.4% for HYP and from 103.1% to 111.2% for INO, with average relative standard deviations lower than 4.2% in both cases. This new method, which is rapid, simple and sensitive, can be used as an alternative tool to conventional tedious methods.
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72
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Sen S, Sarkar P. A novel third-generation xanthine biosensor with enzyme modified glassy carbon electrode using electrodeposited MWCNT and nanogold polymer composite film. RSC Adv 2015. [DOI: 10.1039/c5ra18889j] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
A new design of xanthine biosensor with novel nanogold decorated poly(o-phenylenediamine) film and functionalized MWCNT having excellent sensitivity, stability and detection limit.
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Affiliation(s)
- Sarani Sen
- Sensor Laboratory
- Department of Polymer Science and Technology
- University of Calcutta
- Kolkata 700009
- India
| | - Priyabrata Sarkar
- Sensor Laboratory
- Department of Polymer Science and Technology
- University of Calcutta
- Kolkata 700009
- India
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73
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Arvand M, Anvari M. Graphene nanosheets as a sensing platform for amplified electrochemical measurement of quercetin and uric acid in biological fluids. CAN J CHEM 2014. [DOI: 10.1139/cjc-2014-0264] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
A simple and selective electrochemical method was investigated for the simultaneous determination of quercetin (Qu) and uric acid (UA) in aqueous media (citrate buffer solution, pH 4.0) on a glassy carbon electrode modified with graphene nanosheets as a sensing platform (GNSs/GCE). Cyclic voltammetry, transmission electron microscopy, and Fourier transform infrared spectroscopy were employed to characterize the nanostructure of the sensor. Separation of the oxidation peak potentials for Qu and UA was about 160 mV, and the anodic currents for the oxidation of both Qu and UA are greatly increased at GNSs/GCE, which makes it suitable for simultaneous determination of these compounds. The detection limits were 0.0011 and 0.0137 μmol/L for Qu and UA, respectively. The method was applied to the determination of Qu and UA in human blood serum and urine samples.
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Affiliation(s)
- Majid Arvand
- Electroanalytical Chemistry Laboratory, Faculty of Science, University of Guilan, Namjoo Street, P.O. Box 1914, Rasht, Iran
| | - Mohsen Anvari
- Electroanalytical Chemistry Laboratory, Faculty of Science, University of Guilan, Namjoo Street, P.O. Box 1914, Rasht, Iran
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74
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Sadeghi S, Fooladi E, Malekaneh M. A nanocomposite/crude extract enzyme-based xanthine biosensor. Anal Biochem 2014; 464:51-9. [PMID: 25062853 DOI: 10.1016/j.ab.2014.07.013] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/18/2014] [Revised: 07/12/2014] [Accepted: 07/15/2014] [Indexed: 10/25/2022]
Abstract
A novel amperometric biosensor for xanthine was developed based on covalent immobilization of crude xanthine oxidase (XOD) extracted from bovine milk onto a hybrid nanocomposite film via glutaraldehyde. Toward the preparation of the film, a stable colloids solution of core-shell Fe3O4/polyaniline nanoparticles (PANI/Fe3O4 NPs) was dispersed in solution containing chitosan (CHT) and H2PtCl6 and electrodeposited over the surface of a carbon paste electrode (CPE) in one step. Scanning electron microscopy (SEM), Fourier transform infrared (FTIR) spectrophotometry, cyclic voltammetry (CV), and electrochemical impedance spectroscopy (EIS) were used for characterization of the electrode surface. The developed biosensor (XOD/CHT/Pt NPs/PANI/Fe3O4/CPE) was employed for determination of xanthine based on amperometric detection of hydrogen peroxide (H2O2) reduction at -0.35V (vs. Ag/AgCl). The biosensor exhibited a fast response time to xanthine within 8s and a linear working concentration range from 0.2 to 36.0μM (R(2)=0.997) with a detection limit of 0.1μM (signal/noise [S/N]=3). The sensitivity of the biosensor was 13.58μAμM(-1)cm(-2). The apparent Michaelis-Menten (Km) value for xanthine was found to be 4.7μM. The fabricated biosensor was successfully applied for measurement of fish and chicken meat freshness, which was in agreement with the standard method at the 95% confidence level.
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Affiliation(s)
- Susan Sadeghi
- Department of Chemistry, Faculty of Science, University of Birjand, Birjand, South Khorasan, Iran.
| | - Ebrahim Fooladi
- Department of Chemistry, Faculty of Science, University of Birjand, Birjand, South Khorasan, Iran
| | - Mohammad Malekaneh
- Department of Clinical Biochemistry, Birjand University of Medical Sciences, Birjand, South Khorasan, Iran
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Farias PAM, Castro AA. Determination of xanthine in the presence of hypoxanthine by adsorptive stripping voltammetry at the mercury film electrode. ANALYTICAL CHEMISTRY INSIGHTS 2014; 9:49-55. [PMID: 24940040 PMCID: PMC4055419 DOI: 10.4137/aci.s14712] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 02/16/2014] [Revised: 03/27/2014] [Accepted: 04/09/2014] [Indexed: 11/05/2022]
Abstract
A stripping method for the determination of xanthine in the presence of hypoxanthine at the submicromolar concentration levels is described. The method is based on controlled adsorptive accumulation at the thin-film mercury electrode followed by a fast linear scan voltammetric measurement of the surface species. Optimum experimental conditions were found to be the use of 1.0 × 10(-3) mol L(-1) NaOH solution as supporting electrolyte, an accumulation potential of 0.00 V for xanthine and -0.50 V for hypoxanthine-copper, and a linear scan rate of 200 mV second(-1). The response of xanthine is linear over the concentration ranges of 20-140 ppb. For an accumulation time of 30 minutes, the detection limit was found to be 36 ppt (2.3 × 10(-10) mol L(-1)). Adequate conditions for measuring the xanthine in the presence of hypoxanthine, copper and other metals, uric acid, and other nitrogenated bases were also investigated. The utility of the method is demonstrated by the presence of xanthine associated with hypoxanthine, uric acid, nitrogenated bases, ATP, and ssDNA.
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Affiliation(s)
| | - Arnaldo Aguiar Castro
- Department of Chemistry, Pontifícia Universidade Católica, Rua Marquês de São Vicente, Rio de Janeiro, Brazil. ; Facultad Quimica, Quimica Analitica, Universidad de La Habana, Cuba
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76
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Kumar V, Misra N, Paul J, Dhanawade B, Varshney L. Uricase-immobilization on radiation grafted polymer support for detection of uric acid using Ag-nanoparticle based optical biosensor. POLYMER 2014. [DOI: 10.1016/j.polymer.2014.04.012] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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77
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Pundir CS, Devi R. Biosensing methods for xanthine determination: A review. Enzyme Microb Technol 2014; 57:55-62. [DOI: 10.1016/j.enzmictec.2013.12.006] [Citation(s) in RCA: 47] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/16/2013] [Revised: 12/03/2013] [Accepted: 12/07/2013] [Indexed: 01/03/2023]
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78
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BAş SALIHZEKI, GüLCE HANDAN, YILDIZ SALIH. Hypoxanthine Biosensor Based on Immobilization of Xanthine Oxidase on Modified Pt Electrode and Its Application for Fish Meat. INT J POLYM MATER PO 2014. [DOI: 10.1080/00914037.2013.854215] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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79
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Szterk A, Roszko M. SIMULTANEOUS DETERMINATION OF FREE AMINO ACIDS, L-CARNOSINE, PURINE, PYRIMIDINE, AND NUCLEOSIDES IN MEAT BY LIQUID CHROMATOGRAPHY/SINGLE QUADRUPOLE MASS SPECTROMETRY. J LIQ CHROMATOGR R T 2014. [DOI: 10.1080/10826076.2012.758136] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- Arkadiusz Szterk
- a Department of Functional Food and Commodities Faculty of Human Nutrition and Consumer Sciences , Warsaw University of Life Sciences , Warsaw , Poland
| | - Marek Roszko
- b Department of Food Analysis , Institute of Agricultural and Food Biotechnology , Warsaw , Poland
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80
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Xiang LW, Li J, Lin JM, Li HF. Determination of gouty arthritis' biomarkers in human urine using reversed-phase high-performance liquid chromatography. J Pharm Anal 2013; 4:153-158. [PMID: 29403877 PMCID: PMC5761083 DOI: 10.1016/j.jpha.2013.11.003] [Citation(s) in RCA: 23] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2013] [Accepted: 11/30/2013] [Indexed: 11/18/2022] Open
Abstract
Creatinine, uric acid, hypoxanthine and xanthine are important diagnostic biomarkers in human urine for gouty arthritis or renal disease diacrisis. A simple method for simultaneous determination of these biomarkers in urine based on reversed-phase high-performance liquid chromatography (RP-HPLC) with ultraviolet (UV) detector was proposed. After pretreatment by dilution, centrifugation and filtration, the biomarkers in urine samples were separated by ODS-BP column by elution with methanol/50 mM NaH2PO4 buffer solution at pH 5.26 (5:95). Good linearity between peak areas and concentrations of standards was obtained for the biomarkers with correlation coefficients in the range of 0.9957–0.9993. The proposed analytical method has satisfactory repeatability (the recovery of data in a range of creatinine, uric acid, hypoxanthine and xanthine was 93.49–97.90%, 95.38–96.45%, 112.46–115.78% and 90.82–97.13% with standard deviation of <5%, respectively) and the limits of detection (LODs, S/N≥3) for creatinine, uric acid, hypoxanthine, and xanthine were 0.010, 0.025, 0.050 and 0.025 mg/L, respectively. The established method was proved to be simple, accurate, sensitive and reliable for the quantitation of gouty arthritis' biomarkers in human urine samples. The ratio of creatinine to uric acid was found to be a possible factor for assessment of gouty arthritis.
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Affiliation(s)
- Lei-Wen Xiang
- Beijing Key Laboratory of Microanalysis Methods and Instrumentation, Department of Chemistry, Tsinghua University, Beijing 100084, China
- Institute of Food and Fermentation Industries, Fuqing Branch of Fujian Normal University, Fuqing 350300, China
| | - Jing Li
- Beijing Key Laboratory of Microanalysis Methods and Instrumentation, Department of Chemistry, Tsinghua University, Beijing 100084, China
| | - Jin-Ming Lin
- Beijing Key Laboratory of Microanalysis Methods and Instrumentation, Department of Chemistry, Tsinghua University, Beijing 100084, China
| | - Hai-Fang Li
- Beijing Key Laboratory of Microanalysis Methods and Instrumentation, Department of Chemistry, Tsinghua University, Beijing 100084, China
- Corresponding author. Tel./fax: +86 10 62797463.
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81
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Luo X, Cai N, Cheng Z. Determination of uric acid in plasma by LC-MS/MS and its application to an efficacy evaluation of recombinant urate oxidase. ANAL SCI 2013; 29:709-13. [PMID: 23842413 DOI: 10.2116/analsci.29.709] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
A liquid chromatography-tandem mass spectrometry (LC-MS/MS) method for the determination of uric acid in human plasma was developed and validated. Separation was achieved on a C18 column by the mobile phase of 30% water (containing 0.5% formic acid) and 70% methanol. Quantification was done using a multiple reaction monitoring (MRM) mode to monitor the precursor-to-product ion transitions of m/z 169.1 → m/z 141.1 for uric acid and m/z 171 → m/z 143 for 1,3-(15)N uric acid (IS) at a positive ionization mode. The calibration curve was established over the range of 0.4096 - 100 mg/L, and the correlation coefficient was better than 0.99. The intra-day and inter-day relative standard deviations were less than 5.1%. The accuracy determined at three concentrations ranged between 92.7 and 102.3%. This method was successfully applied to an efficacy study of intravenous recombinant urate oxidase produced by Escherichia coli in a clinical phase I study.
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Affiliation(s)
- Xi Luo
- Research Institute of Drug Metabolism and Pharmacokinetics, School of Pharmaceutical Sciences, Central South University, Changsha, Hunan, P. R. China
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82
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Mukthinuthalapati MA, Bandaru SPK, Bukkapatnam V, Mohapatro C. Development and Validation of a Stability-Indicating RP-HPLC Method for the Determination of Febuxostat (a Xanthine Oxidase Inhibitor). J Chromatogr Sci 2012. [DOI: 10.1093/chromsci/bms192] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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83
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Lawal AT, Adeloju SB. Progress and recent advances in fabrication and utilization of hypoxanthine biosensors for meat and fish quality assessment: a review. Talanta 2012; 100:217-28. [PMID: 23141330 DOI: 10.1016/j.talanta.2012.07.085] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/14/2012] [Revised: 07/28/2012] [Accepted: 07/31/2012] [Indexed: 10/28/2022]
Abstract
This review provides an update on the research conducted on the fabrication and utilization of hypoxanthine (Hx) biosensors published over the past four decades. In particular, the review focuses on progress made in the development and use of Hx biosensors for the assessment of fish and meat quality which has dominated research in this area. The various fish and meat freshness indexes that have been proposed over this period are highlighted. Furthermore, recent developments and future advances in the use of screen-printed electrodes and nanomaterials for achieving improved performances for the reliable determination of Hx in fish and meat are discussed.
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Affiliation(s)
- Abdulazeez T Lawal
- NanoScience and Sensor Technology Research Group, School of Applied Sciences and Engineering, Monash University, Churchill, Vic. 3842, Australia
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84
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Amjadi M, Rahimpour E. Silver nanoparticles plasmon resonance-based method for the determination of uric acid in human plasma and urine samples. Mikrochim Acta 2012. [DOI: 10.1007/s00604-012-0849-7] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/12/2023]
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85
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Liu Y, Li W, Wei C, Lü L. Preparation of a Xanthine Sensor Based on the Immobilization of Xanthine Oxidase on a Chitosan Modified Electrode by Cross‐linking. CHINESE J CHEM 2012. [DOI: 10.1002/cjoc.201100477] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Affiliation(s)
- Yuge Liu
- South Subtropical Crops Research Institute, Chinese Academy of Tropical Agricultural Science, Zhanjiang, Guangdong 524091, China
| | - Weiming Li
- South Subtropical Crops Research Institute, Chinese Academy of Tropical Agricultural Science, Zhanjiang, Guangdong 524091, China
| | - Changbin Wei
- South Subtropical Crops Research Institute, Chinese Academy of Tropical Agricultural Science, Zhanjiang, Guangdong 524091, China
| | - Lingling Lü
- South Subtropical Crops Research Institute, Chinese Academy of Tropical Agricultural Science, Zhanjiang, Guangdong 524091, China
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86
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Liu L, Wang H, Bo X, Yang L, Guo L. Electrochemistry and Simultaneous Detection of Metabolites of Purine Nucleotide Based on Large Mesoporous Carbon Modified Electrode. ELECTROANAL 2012. [DOI: 10.1002/elan.201200095] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
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87
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Zhang F, Wang Z, Zhang Y, Zheng Z, Wang C, Du Y, Ye W. Simultaneous electrochemical determination of uric acid, xanthine and hypoxanthine based on poly(l-arginine)/graphene composite film modified electrode. Talanta 2012; 93:320-5. [DOI: 10.1016/j.talanta.2012.02.041] [Citation(s) in RCA: 98] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/31/2011] [Revised: 02/09/2012] [Accepted: 02/17/2012] [Indexed: 11/16/2022]
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88
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Lukram O, Parmar S, Hande A. Determination of febuxostat in human plasma using ultra-performance liquid chromatography tandem mass spectrometry. Drug Test Anal 2012; 5:492-9. [DOI: 10.1002/dta.420] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/25/2011] [Revised: 12/29/2011] [Accepted: 12/29/2011] [Indexed: 01/20/2023]
Affiliation(s)
- Ojikumar Lukram
- LifeSan Clinical Research; Division of Centaur Pharmaceuticals Pvt. Ltd; Vakola, Santacruz (East); Mumbai; India
| | - Shivaji Parmar
- LifeSan Clinical Research; Division of Centaur Pharmaceuticals Pvt. Ltd; Vakola, Santacruz (East); Mumbai; India
| | - Amit Hande
- LifeSan Clinical Research; Division of Centaur Pharmaceuticals Pvt. Ltd; Vakola, Santacruz (East); Mumbai; India
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89
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Allopurinol does not decrease blood pressure or prevent the development of hypertension in the deoxycorticosterone acetate-salt rat model. J Cardiovasc Pharmacol 2012; 56:627-34. [PMID: 20881613 DOI: 10.1097/fjc.0b013e3181f80194] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/07/2023]
Abstract
Reactive oxygen species play an important role in the pathogenesis of hypertension, disease in which reactive oxygen species levels and markers of oxidative stress are increased. Xanthine oxidase (XO) is a reactive oxygen species-producing enzyme the activity of which may increase during hypertension. Studies on XO inhibition effects on blood pressure have yielded controversial results. We hypothesized that XO inhibition would decrease blood pressure or attenuate the development of deoxycorticosterone acetate (DOCA)-salt hypertension. We administered the XO inhibitor, allopurinol (50 mg/kg per day, orally) or its vehicle to rats during the established or development stages of DOCA-salt hypertension. We validated XO inhibition by high-performance liquid chromatography measurements of XO metabolites in urine, serum, and tissues demonstrating a decrease in products, increase in substrates, and detection of the active metabolite of allopurinol, oxypurinol. We monitored blood pressure continuously through radiotelemetry and performed gross evaluations of target organs of hypertension. Allopurinol treatment did not impact the course of DOCA-salt hypertension regardless of the timing of administration. Aside from a significant decrease in pulse pressure in allopurinol-treated rats, no positive differences were observed between the allopurinol and the vehicle-treated rats. We conclude that XO does not play an important role in the development or maintenance of hypertension in the rat DOCA-salt hypertension model.
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90
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Devi R, Yadav S, Pundir C. Au-colloids–polypyrrole nanocomposite film based xanthine biosensor. Colloids Surf A Physicochem Eng Asp 2012. [DOI: 10.1016/j.colsurfa.2011.11.021] [Citation(s) in RCA: 30] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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91
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Zhang L, Lei J, Zhang J, Ding L, Ju H. Amperometric detection of hypoxanthine and xanthine by enzymatic amplification using a gold nanoparticles–carbon nanohorn hybrid as the carrier. Analyst 2012; 137:3126-31. [DOI: 10.1039/c2an35284b] [Citation(s) in RCA: 45] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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92
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Amperometric biosensors based on deposition of gold and platinum nanoparticles on polyvinylferrocene modified electrode for xanthine detection. Talanta 2011; 87:189-96. [DOI: 10.1016/j.talanta.2011.09.060] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/08/2011] [Revised: 09/20/2011] [Accepted: 09/27/2011] [Indexed: 11/21/2022]
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93
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Wang Y. Simultaneous determination of uric acid, xanthine and hypoxanthine at poly(pyrocatechol violet)/functionalized multi-walled carbon nanotubes composite film modified electrode. Colloids Surf B Biointerfaces 2011; 88:614-21. [DOI: 10.1016/j.colsurfb.2011.07.051] [Citation(s) in RCA: 73] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2011] [Revised: 07/11/2011] [Accepted: 07/25/2011] [Indexed: 11/24/2022]
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94
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Amperometric xanthine biosensors based on electrodeposition of platinum on polyvinylferrocenium coated Pt electrode. ACTA ACUST UNITED AC 2011. [DOI: 10.1016/j.molcatb.2011.06.017] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/18/2022]
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95
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The determination of ascorbic acid and uric acid in human seminal plasma using an HPLC with UV detection. J Chromatogr B Analyt Technol Biomed Life Sci 2011; 879:2834-9. [DOI: 10.1016/j.jchromb.2011.08.007] [Citation(s) in RCA: 71] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2011] [Revised: 08/06/2011] [Accepted: 08/08/2011] [Indexed: 02/04/2023]
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96
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Voltammetric determination of some alkaloids and other compounds in pharmaceuticals and urine using an electrochemically activated glassy carbon electrode. OPEN CHEM 2011. [DOI: 10.2478/s11532-011-0058-y] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022] Open
Abstract
AbstractElectrochemical behaviour of some alkaloids, namely: caffeine, aminophylline, theophylline, codeine phosphate and papaverine hydrochloride, that are in solution in various combinations or in the presence of other compounds contained in pharmaceuticals or in real samples (urine) was investigated using cyclic voltammetry (CV), square-wave voltammetry (SWV) and differential pulse voltammetry (DPV) on electrochemically activated glassy carbon electrode. The proposed electroanalytical methods were successfully applied in the simultaneous determination of these alkaloids in different combination or in the presence of other compounds. The great part of these combinations can be analyzed simultaneously because they practically do not interfere. The electrochemical test methods attempted to detect the presence of alkaloids in urine samples collected from subjects who consumed coffee (caffeine), and from a patient under treatment with Miofilin® (aminophylline). Urine samples were determined after filtration, without prior dilution and after dilutiion with acetate buffer at pH 4.5. Best results were obtained using DPV performed on electrochemically activated glassy carbon electrode. Thus in samples taken from subjects who drink coffee the caffeine concentration detected was 6.21×10−7 mol L−1 in the first sample and 7.77×10−7 mol L−1 in the second sample, while aminophylline concentration detected was 1.15×10−7 mol L−1.
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97
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Shi J, Liu HF, Wong JM, Huang RN, Jones E, Carlson TJ. Development of a robust and sensitive LC-MS/MS method for the determination of adenine in plasma of different species and its application to in vivo studies. J Pharm Biomed Anal 2011; 56:778-84. [PMID: 21840665 DOI: 10.1016/j.jpba.2011.07.023] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/10/2011] [Revised: 07/19/2011] [Accepted: 07/20/2011] [Indexed: 11/19/2022]
Abstract
A simple, robust, and sensitive liquid chromatography-tandem mass spectrometric (LC-MS/MS) method was developed for the measurement of endogenous adenine in mouse, rat, cynomolgus monkey, and human plasma. A "surrogate analyte" strategy was adopted by employing [(13)C(U)]-adenine as the surrogate analyte. The plasma samples were processed by protein precipitation, and the extracted supernatant samples were subjected directly to LC-MS/MS analysis. The analysis was carried out in the negative ion detection mode using selected-reaction monitoring (SRM). The method achieved a lower limit of quantification (LLOQ) of 5.0nM with a signal-to-noise ratio of 10. The intra- and inter-day assay coefficients of variation (CV) were ≤6.67% in rat plasma, and the mean recoveries and matrix effects across species and at various concentrations ranged from 88.8% to 104.2% and 86.0% to 110.8%, respectively. Using this methodology, the endogenous concentration of adenine in plasma of four species was found to range from 8.7nM in human to 93.1nM in cynomolgus monkey plasma. The assay was further applied to both an adenine pharmacokinetic study and a pivotal pharmacodynamic study evaluating the plasma concentration of adenine after a dose of 5'-deoxy-5'-methylthioadenosine (MTA).
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Affiliation(s)
- Jianxia Shi
- Department of Pharmacokinetics and Drug Metabolism, Amgen Inc., 1120 Veterans Blvd., South San Francisco, CA 94080, United States.
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98
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Abstract
AbstractThe electrochemical behaviour of three purine derivatives was investigated by cyclic voltammetry on different electrode materials: glassy carbon in native form and electrochemically activated, carbon paste electrode unmodified or modified with 1, 4-benzoquinone. The preliminary study obtained on solid electrodes was extended to graphite based planar screen-printed electrodes, unmodified and modified with multi-wall carbon nanotubes, or cobalt phthalocyanine.The influence of some experimental parameters (pH, scan rate, concentration and electrolytic medium) on the electrochemical behaviour of these alkaloids was also examined.The electrochemical oxidation of purine derivatives is an irreversible and diffusion controlled process, proved by the linear dependence between the peak potentials and the logarithm of scan rates and between the anodic peak current and the square root of scan rate.
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99
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A nonenzymatic sensor for xanthine based on electrospun carbon nanofibers modified electrode. Talanta 2011; 83:1410-4. [DOI: 10.1016/j.talanta.2010.11.019] [Citation(s) in RCA: 49] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/12/2010] [Revised: 11/09/2010] [Accepted: 11/11/2010] [Indexed: 11/22/2022]
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100
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Analysis of seven purines and pyrimidines in pork meat products by ultra high performance liquid chromatography–tandem mass spectrometry. J Chromatogr A 2010; 1217:4294-9. [DOI: 10.1016/j.chroma.2010.04.033] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/10/2010] [Revised: 03/23/2010] [Accepted: 04/12/2010] [Indexed: 11/30/2022]
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