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Demissie N, Simha P, Lai FY, Ahrens L, Mussabek D, Desta A, Vinnerås B. Degradation of 75 organic micropollutants in fresh human urine and water by UV advanced oxidation process. WATER RESEARCH 2023; 242:120221. [PMID: 37390654 DOI: 10.1016/j.watres.2023.120221] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/11/2023] [Revised: 05/17/2023] [Accepted: 06/10/2023] [Indexed: 07/02/2023]
Abstract
In household wastewater, a large proportion of organic micropollutants (OMPs) load is attributed to human urine. OMPs could pose a risk to human and environmental health when urine collected in source-separating sanitation systems is recycled as crop fertiliser. This study evaluated degradation of 75 OMPs in human urine treated by a UV-based advanced oxidation process. Fresh urine and water samples were spiked with a broad range of OMPs and fed into a photoreactor equipped with a UV lamp (185 and 254 nm) that generated free radicals in situ. Degradation rate constant and the energy required to degrade 90% of all the OMPs in both matrices were determined. At a UV dose of 2060 J m-2, average ΣOMP degradation of 99% (±4%) in water and 55% (±36%) in fresh urine was achieved. The energy demand for removal of OMPs in water was <1500 J m-2, but for removal of OMPs in urine at least 10-fold more energy was needed. A combination of photolysis and photo-oxidation can explain the degradation of OMPs during UV treatment. Organic substances (e.g. urea, creatinine) likely inhibited degradation of OMPs in urine by competitively absorbing UV-light and scavenging free radicals. There was no reduction in the nitrogen content of urine during treatment. In summary, UV treatment can reduce the load of OMPs to urine recycling sanitation systems.
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Affiliation(s)
- Natnael Demissie
- Department of Energy and Technology, Swedish University of Agricultural Sciences, Box 7032, SE-750 07 Uppsala, Sweden; College of Natural and Computational Sciences, Institute of Biotechnology, Addis Ababa University, Box 1176 Addis Ababa, Ethiopia.
| | - Prithvi Simha
- Department of Energy and Technology, Swedish University of Agricultural Sciences, Box 7032, SE-750 07 Uppsala, Sweden
| | - Foon Yin Lai
- Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences, Box 7050, SE-750 07 Uppsala, Sweden
| | - Lutz Ahrens
- Department of Aquatic Sciences and Assessment, Swedish University of Agricultural Sciences, Box 7050, SE-750 07 Uppsala, Sweden
| | - Dauren Mussabek
- Division of Water Resources Engineering, Lund University, Box 118 SE-22100 Lund, Sweden
| | - Adey Desta
- College of Natural and Computational Sciences, Institute of Biotechnology, Addis Ababa University, Box 1176 Addis Ababa, Ethiopia
| | - Björn Vinnerås
- Department of Energy and Technology, Swedish University of Agricultural Sciences, Box 7032, SE-750 07 Uppsala, Sweden
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2
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Wicht K, Baert M, von Doehren N, Desmet G, de Villiers A, Lynen F. Speeding up temperature-responsive × reversed-phase comprehensive liquid chromatography through the combined exploitation of temperature and flow rate gradients. J Chromatogr A 2022; 1685:463584. [DOI: 10.1016/j.chroma.2022.463584] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/28/2022] [Revised: 10/15/2022] [Accepted: 10/18/2022] [Indexed: 11/27/2022]
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3
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Pedrozo-Penafiel M, Lópes T, Gutierrez-Beleno L, Miranda-Andrades J, Maia da Costa M, Gonzalez-Larrude D, Aucélio R. Determination of creatinine in urine by voltammetry and glassy carbon electrode modified with functionalized multi‐walled carbon nanotubes and copper. ELECTROANAL 2022. [DOI: 10.1002/elan.202200081] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
| | - Thais Lópes
- Pontifical Catholic University of Rio de Janeiro BRAZIL
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4
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Ibrahim H, Hamdy AM, Merey HA, Saad AS. Dual-Mode Gradient HPLC and TLC Densitometry Methods for the Simultaneous Determination of Paracetamol and Methionine in the Presence of Paracetamol Impurities. J AOAC Int 2021; 104:975-982. [PMID: 33560299 PMCID: PMC7928902 DOI: 10.1093/jaoacint/qsab021] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/01/2020] [Revised: 11/20/2020] [Accepted: 01/22/2021] [Indexed: 01/06/2023]
Abstract
Background Paracetamol is one of the most widely analgesic and antipyretic drugs recently integrated into the supportive therapy of COVID-19. The pharmaceuticals containing methionine with paracetamol may contribute to avoid hepatotoxicity and eventual paracetamol overdose-dependent death. Objective The current work purposes to develop and validate two chromatographic methods for the simultaneous determination of methionine and paracetamol in presence of two paracetamol impurities (4-nitrophenol and 4-aminophenol). Methods Two chromatographic methods were established and validated according to the International Conference on Harmonization guidelines. The first one was a RP-HPLC/UV method based on applying a “dual-mode” gradient elution. The separation was realized via varying both the composition of the ternary mobile phase (acetonitrile–methanol–water) and its flow rate. This strategy enabled a relatively rapid analysis with a satisfactory resolution, although the investigated compounds exhibit a significant difference in lipophilicity. The second one relied on TLC- densitometry, where the optimum separation was realized using a quaternary mobile phase system composed of butanol–dioxane–toluene–methanol (8: 2.5: 3.5: 0.3, by volume). Both methods were monitored at 220 nm. Results The developed methods were proven to be robust, accurate, specific, and appropriate for the routine analysis of paracetamol in its pure form or in pharmaceutical formulations with methionine in quality control laboratories. Conclusions The corresponding methods are suitable to determine methionine and paracetamol in the presence of paracetamol impurities. Highlights The study achieves the analysis of methionine and paracetamol in the presence of paracetamol impurities via the application of HPLC and TLC- densitometry methods.
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Affiliation(s)
- Hany Ibrahim
- Egyptian Russian University, Faculty of Pharmacy, Analytical Chemistry Department, Badr City, Cairo, Egypt
| | - Abdallah M Hamdy
- Egyptian Russian University, Faculty of Pharmacy, Analytical Chemistry Department, Badr City, Cairo, Egypt
| | - Hanan A Merey
- Cairo University, Faculty of Pharmacy, Analytical Chemistry Department, Kasr El-Aini St, Cairo, Egypt.,October 6 University, Faculty of Pharmacy, Analytical Chemistry Department, Giza, Egypt
| | - Ahmed S Saad
- Cairo University, Faculty of Pharmacy, Analytical Chemistry Department, Kasr El-Aini St, Cairo, Egypt.,Badr University in Cairo (BUC), School of Pharmacy and Pharmaceutical Industries, Pharmaceutical Chemistry Department, Cairo, Egypt
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Pedrozo-Peñafiel MJ, Lópes T, Gutiérrez-Beleño LM, Da Costa MEM, Larrudé DG, Aucelio RQ. Voltammetric determination of creatinine using a gold electrode modified with Nafion mixed with graphene quantum dots-copper. J Electroanal Chem (Lausanne) 2020. [DOI: 10.1016/j.jelechem.2020.114561] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022]
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6
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Patel DP, Pauly GT, Tada T, Parker AL, Toulabi L, Kanke Y, Oike T, Krausz KW, Gonzalez FJ, Harris CC. Improved detection and precise relative quantification of the urinary cancer metabolite biomarkers - Creatine riboside, creatinine riboside, creatine and creatinine by UPLC-ESI-MS/MS: Application to the NCI-Maryland cohort population controls and lung cancer cases. J Pharm Biomed Anal 2020; 191:113596. [PMID: 32937240 PMCID: PMC7756200 DOI: 10.1016/j.jpba.2020.113596] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/14/2020] [Revised: 08/11/2020] [Accepted: 08/12/2020] [Indexed: 01/21/2023]
Abstract
Creatine riboside (CR) is a novel metabolite of cancer metabolism. It is a urinary diagnostic biomarker of lung and liver cancer risk and prognosis. The level of CR is highly positive correlated in tumor and urine indicating that it is derived from human lung and liver cancers. A precise and sensitive ultra-pressure liquid chromatography-tandem mass spectrometry (UPLC-ESI-MS/MS) method was developed and validated for simultaneous quantification of the noninvasive biomarker CR, along with creatinine riboside (CNR), and their precursors creatine and creatinine, utilizing the labeled internal standard creatine riboside-13C,15N2 (CR-13C,15N2). Chromatography was carried out on a hydrophilic interaction chromatography column under a gradient mobile phase condition. MRM transitions were monitored for CR (264.1 > 132.1, m/z), CNR (246.1 > 113.9, m/z), creatine (132.0 > 72.0, m/z), creatinine (114.0 > 85.8, m/z) and CR-13C,15N2 (267.1 > 134.9, m/z) with a 11.0 min run time in the positive mode ionization. The calibration plot of the method was linear over the concentration range of 4.50-10,000 nM. Method validation was performed according to regulatory guidelines established for sensitivity, selectivity, calibration curve, stability at different storage conditions, reinjection reproducibility, ruggedness with acceptable accuracy, and precision. This assay was applied for the quantification of CR along with CNR, creatine and creatinine in a subset of urine and serum samples from the National Cancer Institute - Maryland (NCI-MD) cohort population controls and lung cancer cases. It can be standardized and used in multiple laboratories for cancer diagnosis and determining the efficacy of cancer therapy and monitoring cancer recurrence.
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Affiliation(s)
- Daxesh P Patel
- Laboratory of Human Carcinogenesis, Center for Cancer Research, National Cancer Institute, Bethesda, MD, USA
| | - Gary T Pauly
- Chemical Biology Laboratory, Center for Cancer Research, National Cancer Institute, Fredrick, MD, USA
| | - Takeshi Tada
- Laboratory of Human Carcinogenesis, Center for Cancer Research, National Cancer Institute, Bethesda, MD, USA
| | - Amelia L Parker
- Laboratory of Human Carcinogenesis, Center for Cancer Research, National Cancer Institute, Bethesda, MD, USA
| | - Leila Toulabi
- Laboratory of Human Carcinogenesis, Center for Cancer Research, National Cancer Institute, Bethesda, MD, USA
| | - Yasuyuki Kanke
- Laboratory of Human Carcinogenesis, Center for Cancer Research, National Cancer Institute, Bethesda, MD, USA
| | - Takahiro Oike
- Laboratory of Human Carcinogenesis, Center for Cancer Research, National Cancer Institute, Bethesda, MD, USA
| | - Kristopher W Krausz
- Laboratory of Metabolism, Center for Cancer Research, National Cancer Institute, Bethesda, MD, USA
| | - Frank J Gonzalez
- Laboratory of Metabolism, Center for Cancer Research, National Cancer Institute, Bethesda, MD, USA
| | - Curtis C Harris
- Laboratory of Human Carcinogenesis, Center for Cancer Research, National Cancer Institute, Bethesda, MD, USA.
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Sheta SM, Akl MA, Saad HE, El-Gharkawy ESRH. A novel cerium(iii)–isatin Schiff base complex: spectrofluorometric and DFT studies and application as a kidney biomarker for ultrasensitive detection of human creatinine. RSC Adv 2020; 10:5853-5863. [PMID: 35497461 PMCID: PMC9049238 DOI: 10.1039/c9ra10133k] [Citation(s) in RCA: 20] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2019] [Accepted: 01/20/2020] [Indexed: 12/17/2022] Open
Abstract
A novel and promising Schiff base and Ce(iii)-complex were synthesized and fully characterized. A novel creatinine optical biosensor based on Ce(iii)-complex and could be a promising analytical tool and as a promising kidney biomarker.
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Affiliation(s)
- Sheta M. Sheta
- Inorganic Chemistry Department
- National Research Centre
- Giza
- Egypt
| | - Magda A. Akl
- Chemistry Department
- Faculty of Science
- Mansoura University
- Mansoura
- Egypt
| | - Heba E. Saad
- Chemistry Department
- Faculty of Science
- Mansoura University
- Mansoura
- Egypt
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8
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Zakalskiy A, Stasyuk N, Gonchar M. Creatinine Deiminase: Characterization, Using in Enzymatic Creatinine Assay, and Production of the Enzyme. Curr Protein Pept Sci 2019; 20:465-470. [PMID: 30426898 DOI: 10.2174/1389203720666181114111731] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2018] [Revised: 10/19/2018] [Accepted: 11/08/2018] [Indexed: 11/22/2022]
Abstract
The goal of the review is description of the main characteristics of creatinine deiminase (CDI), an important bioanalytical tool for creatinine (Crn) assay. Crn is an essential metabolite for diagnostics of kidney disfunction and some other diseases, a biomarker to control the hemodialysis procedure, as well as an important analyte for sport medicine (estimation of general physiological status of athletes). We have described the important sources for CDI isolation, cloning of the corresponding gene, the construction of microbial recombinant strains, overproducing CDI, and characteristics of the enzyme from different microorganisms. There are reviewing also the new bioanalytical methods for quantitative determination of Crn, including enzymatic ones based on using CDI.
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Affiliation(s)
- Andriy Zakalskiy
- Department of Analytical Biotechnology, Institute of Cell Biology, National Academy of Sciences of Ukraine, 14/16 Drahomanov Str., 79005, Lviv, Ukraine.,Lviv State University of Physical Culture, 11 Kostiushko Str., 79000, Lviv, Ukraine
| | - Nataliya Stasyuk
- Department of Analytical Biotechnology, Institute of Cell Biology, National Academy of Sciences of Ukraine, 14/16 Drahomanov Str., 79005, Lviv, Ukraine
| | - Mykhailo Gonchar
- Department of Analytical Biotechnology, Institute of Cell Biology, National Academy of Sciences of Ukraine, 14/16 Drahomanov Str., 79005, Lviv, Ukraine.,Lviv State University of Physical Culture, 11 Kostiushko Str., 79000, Lviv, Ukraine
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9
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Optimal Conditions for the Direct RP-HPLC Determination of Underivatized Amino Acids with Online Multiple Detection. Methods Mol Biol 2019. [PMID: 31347135 DOI: 10.1007/978-1-4939-9639-1_31] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register]
Abstract
The combined use of a dual-UV detector as well as a fluorimetric and a multielectrode electrochemical detector (equipped with a dual electrode, consisting of a conventional size 3 mm diameter glassy carbon electrode (GCE) and of a pair of 30 μm thick carbon microfibers) is proposed for the detection of the following 15 underivatized amino acids: L-histidine (His), L-cysteine (Cys), creatine (Crn), S-methyl-L-cysteine (Me-Cys), DL-homocysteine (Hcy), L-methionine (Met), beta-(3,4-dihydroxyphenyl)-L-alanine (DOPA), L-tyrosine (Tyr), DL-m-tyrosine (m-Tyr), L-a-methyl-DOPA (Me-DOPA), L-phenylalanine (Phe), DL-alpha-methyltyrosine (Me-Tyr), 5-hydroxy-tryptophan (5-HTP), 3-nitro-L-tyrosine (NO2Tyr), and L-tryptophan (Trp), as well as of 2 dipeptides L-cystathionine (Cysta) and L-carnosine (Car), and of creatinine (Cre). A multilinear solvent (acetonitrile) gradient elution program, determined by a simple optimization algorithm, is required for the efficient reversed-phase separation of the above mixture of 18 solutes within 27 min at a flow rate of 1.0 mL/min and at 25 °C.
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10
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Impurity profiling of l -asparagine monohydrate by ion pair chromatography applying low wavelength UV detection. J Pharm Biomed Anal 2016; 131:202-207. [DOI: 10.1016/j.jpba.2016.08.035] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2016] [Revised: 08/26/2016] [Accepted: 08/29/2016] [Indexed: 11/17/2022]
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11
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Wahl O, Holzgrabe U. Amino acid analysis for pharmacopoeial purposes. Talanta 2016; 154:150-63. [DOI: 10.1016/j.talanta.2016.03.071] [Citation(s) in RCA: 21] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/29/2016] [Revised: 03/18/2016] [Accepted: 03/21/2016] [Indexed: 11/26/2022]
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12
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13
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Kim H, Seo C, Kim Y, Na M, Kang JS, Lee W, Paik MJ. Simultaneous Urinary Creatine and Creatinine Analysis by High Performance Liquid Chromatography. B KOREAN CHEM SOC 2016. [DOI: 10.1002/bkcs.10743] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Affiliation(s)
- Hyunbin Kim
- College of Pharmacy; Sunchon National University; Suncheon 540-950 Korea
| | - Chan Seo
- College of Pharmacy; Sunchon National University; Suncheon 540-950 Korea
| | - Youngbae Kim
- College of Pharmacy; Sunchon National University; Suncheon 540-950 Korea
| | - Myungjin Na
- College of Pharmacy; Sunchon National University; Suncheon 540-950 Korea
| | - Jong Seong Kang
- College of Pharmacy; Chungnam National University; Daejeon 305-764 Korea
| | - Wonjae Lee
- College of Pharmacy; Chosun University; Gwangju 501-759 Korea
| | - Man-Jeong Paik
- College of Pharmacy; Sunchon National University; Suncheon 540-950 Korea
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14
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YOKOYAMA Y, FUJISHIMA T, KUROTA K. Fast and Efficient Separation and Determination of UV-absorbing Amino Acids, Nucleobases, and Creatinine Using a Carboxy-functionalized Cation-exchange Column. ANAL SCI 2015; 31:371-6. [DOI: 10.2116/analsci.31.371] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- Yukio YOKOYAMA
- Department of Analytical Chemistry, Graduate School of Environment and Information Sciences, Yokohama National University
| | | | - Kazuki KUROTA
- Department of Analytical Chemistry, Graduate School of Environment and Information Sciences, Yokohama National University
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15
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Simultaneous Determination of Imidazole Amino Acids, Aromatic Amino Acids, and Creatinine by Dual-Mode Gradient HPLC Using a Low-Capacity Sulfo-Functionalized Poly(Ethylstyrene-Divinylbenzene) Resin Column. Chromatographia 2013. [DOI: 10.1007/s10337-013-2582-8] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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16
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Serafín V, Hernández P, Agüí L, Yáñez-Sedeño P, Pingarrón J. Electrochemical biosensor for creatinine based on the immobilization of creatininase, creatinase and sarcosine oxidase onto a ferrocene/horseradish peroxidase/gold nanoparticles/multi-walled carbon nanotubes/Teflon composite electrode. Electrochim Acta 2013. [DOI: 10.1016/j.electacta.2013.03.005] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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17
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Yokoyama Y, Yokokawa A, Noguchi K, Tanabe T. Polyfunctional low-capacity cation-exchange packing material for the separation of underivatized amino acids. Talanta 2013. [DOI: 10.1016/j.talanta.2012.10.039] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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18
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Marchenko SV. BIOSENSOR BASED ON CREATININE DEIMINASE AND рH-SENSITIVE FIELD-EFFECT TRANSISTOR FOR CREATININE ANALYSIS IN BLOOD SERUM. BIOTECHNOLOGIA ACTA 2013. [DOI: 10.15407/biotech6.05.079] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022] Open
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19
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Zinchenko O, Marchenko S, Sergeyeva T, Kukla A, Pavlyuchenko A, Krasyuk E, Soldatkin A, El'skaya A. Application of creatinine-sensitive biosensor for hemodialysis control. Biosens Bioelectron 2012; 35:466-469. [DOI: 10.1016/j.bios.2012.02.062] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2011] [Revised: 02/22/2012] [Accepted: 02/24/2012] [Indexed: 11/30/2022]
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20
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Pappa-Louisi A, Agrafiotou P, Sotiropoulos S. Optimal conditions for the direct RP-HPLC determination of underivatized amino acids with online multiple detection. Methods Mol Biol 2012; 828:101-114. [PMID: 22125140 DOI: 10.1007/978-1-61779-445-2_10] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
The combined use of a dual-UV detector as well as a fluorimetric and a multielectrode electrochemical detector (equipped with a dual electrode, consisting of a conventional size 3 mm diameter glassy carbon electrode (GCE) and of a pair of 30 μm thick carbon microfibers) is proposed for the detection of the following 15 underivatized amino acids: L: -histidine (his), L: -cysteine (cys), creatine (crn), S-methyl-L: -cysteine (me-cys), DL: -homocysteine (hcy), L: -methionine (met), beta-(3,4-dihydroxyphenyl)-L: -alanine (dopa), L: -tyrosine (tyr), DL: -m-tyrosine (m-tyr), L: -a-methyl-dopa (me-dopa), L: -phenylanine (phe), DL: -alpha-methyltyrosine (me-tyr), 5-hydroxy-tryptophan (5htp), 3-nitro-L: -tyrosine (NO(2)Tyr) and L: -tryptophan (trp), as well as of two dipeptides: L: -cystathionine (cysta), L: -carnosine (car), and of creatinine (cre). A multilinear solvent (acetonitrile) gradient elution program, determined by a simple optimization algorithm, is required for the efficient reversed phase separation of the above mixture of 18 solutes within 27 min at a flow rate of 1.0 mL/min and at 25°C.
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Affiliation(s)
- A Pappa-Louisi
- Laboratory of Physical Chemistry, Department of Chemistry, Aristotle University of Thessaloniki, Thessaloniki, Greece.
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21
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Song JZ, Qiao CF, Li SL, Zhou Y, Hsieh MT, Xu HX. Rapid optimization of dual-mode gradient high performance liquid chromatographic separation of Radix et Rhizoma Salviae Miltiorrhizae by response surface methodology. J Chromatogr A 2009; 1216:7007-12. [DOI: 10.1016/j.chroma.2009.08.059] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2009] [Revised: 08/19/2009] [Accepted: 08/25/2009] [Indexed: 11/15/2022]
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22
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Agrafiotou P, Sotiropoulos S, Pappa-Louisi A. Direct RP-HPLC determination of underivatized amino acids with online dual UV absorbance, fluorescence, and multiple electrochemical detection. J Sep Sci 2009; 32:949-54. [PMID: 19224631 DOI: 10.1002/jssc.200800636] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
Abstract
The combined use of a dual-UV detector, a fluorimetric one and of a multiple electrochemical (EC) detector equipped with a dual electrode, consisting of a conventional size 3 mm diameter glassy carbon electrode (GCE) and of a pair of 30 mum thick carbon microfibers, is proposed for the determination of 15 amino acids, two dipeptides and creatinine. This online coupling of the above detection modes could partially replace amino acid analysis by derivatization methods, since it solves problems concerning the direct detection of selected underivatized amino acids. Additionally, it was proved that the use of multiple-detection allows positive peak identification in a single chromatographic run, yields more information for free amino acids and solves in some cases the problem of chromatographic resolution. In order to optimize the detection conditions of the underivatized amino acids and related compounds by different detectors, their detection characteristics were determined by adequate preliminary experiments. The electro-oxidation characteristics of the underivatized compounds of interest were determined by hydrodynamic voltammetry using a flow cell with a macrodisc GCE and by ex-situ voltammetry using both a GCE of conventional size and a carbon fiber disk microelectrode. Important practical advantages of microfiber and microdisk electrodes with respect to macroelectrodes were demonstrated.
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Affiliation(s)
- Panagiota Agrafiotou
- Laboratory of Physical Chemistry, Department of Chemistry, Aristotle University of Thessaloniki, Thessaloniki, Greece
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23
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Singh S, Dash AK. Chapter 1 creatine monohydrate. PROFILES OF DRUG SUBSTANCES, EXCIPIENTS, AND RELATED METHODOLOGY 2009; 34:1-35. [PMID: 22469171 DOI: 10.1016/s1871-5125(09)34001-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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Gatti R, Gioia MG. Liquid chromatographic fluorescence determination of amino acids in plasma and urine after derivatization with phanquinone. Biomed Chromatogr 2008; 22:207-13. [DOI: 10.1002/bmc.917] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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25
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Costa ACO, da Costa JL, Tonin FG, Tavares MF, Micke GA. Development of a fast capillary electrophoresis method for determination of creatinine in urine samples. J Chromatogr A 2007; 1171:140-3. [DOI: 10.1016/j.chroma.2007.09.029] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/20/2007] [Revised: 09/12/2007] [Accepted: 09/13/2007] [Indexed: 11/28/2022]
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26
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Pappa-Louisi A, Nikitas P, Balkatzopoulou P, Louizis G. Fundamental Equation of Dual-Mode Gradient Elution in Liquid Chromatography Involving Simultaneous Changes in Flow Rate and Mobile-Phase Composition. Anal Chem 2007; 79:3888-93. [PMID: 17444616 DOI: 10.1021/ac070090r] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The rigorous derivation of the fundamental equation of the dual-mode gradient elution in liquid chromatography involving any type of simultaneous changes in flow rate and mobile-phase composition is developed following Drake's approach. The equation is a generalization of the already known fundamental equations of single gradient when either the mobile-phase composition or the flow rate is constant. The theory was tested in the retention prediction from isocratic data of 18 o-phthalaldehyde derivatives of amino acids in eluting systems modified by acetonitrile or methanol. The retention prediction obtained for all solutes under all dual-mode gradient conditions was excellent. The average percentage error between experimental and predicted retention times ranged from 0.9 to 2.5%. Two approximations that simplify the calculations considerably without increasing the above error were also proposed.
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Affiliation(s)
- A Pappa-Louisi
- Laboratory of Physical Chemistry, Department of Chemistry, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece.
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Nikitas P, Pappa-Louisi A, Balkatzopoulou P. Theory of Stepwise Gradient Elution in Reversed-Phase Liquid Chromatography Coupled with Flow Rate Variations: Application to Retention Prediction and Separation Optimization of a Set of Amino Acids. Anal Chem 2006; 78:5774-82. [PMID: 16906723 DOI: 10.1021/ac0606655] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The coupling of stepwise mobile phase gradient elution and flow programming is proposed as an integrated approach to the general elution problem in reversed-phase liquid chromatography. A model is developed to describe the above separation process performed under simultaneous programming of two separation parameters by extending our previous work on the rigorous derivation of the fundamental equation governing the concentration gradient of organic modifier in the mobile phase, that is, a single gradient elution mode (Anal. Chem. 2005, 77, 5670-5677). The theory was tested in the retention prediction and separation optimization of 18 o-phthalaldehyde derivatives of amino acids in eluting systems modified by acetonitrile or methanol. The retention prediction obtained for all solutes under all dual-mode gradient conditions was excellent. In addition, it has been shown that the combination of mobile phase and flow rate programming modes is particularly favorable, whereas the separations among the analytes were considerably improved by using the acetonitrile eluting system, as compared to those obtained by the methanol system.
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Affiliation(s)
- P Nikitas
- Laboratory of Physical Chemistry, Department of Chemistry, Aristotle University of Thessaloniki, 54124 Thessaloniki, Greece.
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