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Pundi A, Chang CJ, Chen J, Hsieh SR, Lee MC. A dimedone-phenylalanine-based fluorescent sensor for the detection of iron (III), copper (II), L-cysteine, and L-tryptophan in solution and pharmaceutical samples. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2022; 274:121108. [PMID: 35272123 DOI: 10.1016/j.saa.2022.121108] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/22/2021] [Revised: 02/28/2022] [Accepted: 03/01/2022] [Indexed: 06/14/2023]
Abstract
The development of fluorescence molecules for the fast and effective detection of L-tryptophan (L-Trp) has attracted a lot of attention because it is an important amino acid for baby growth, nitrogen equilibrium in adults, improving sleep, and mood regulation. A dimedone-phenylalanine-based chiral sensor (SDPA) was synthesized and exhibited a strong fluorescence quenching by Fe3+ and Cu2+ in a water/DMSO (3/7) solution with a detection limit of 2.29 × 10-6 M and 6.37 × 10-6 M, respectively. The factors affecting fluorescence sensings, such as the pH and competing cations, were studied. The sensor can be reused at least five times after being treated with EDTA. The Job plot, ESI-MS spectra, 1H NMR spectra, absorbance, and fluorescence titration experiments were investigated to study the mechanism of SDPA-Fe3+ and SDPA-Cu2+ complexation. The SDPA-Cu2+ complex can detect L-tryptophan and L-cysteine at trace levels by turn-on fluorescence with a detection limit of 9.35 × 10-6 M and 8.86 × 10-6 M, respectively. Moreover, applying the SDPA-Cu2+ complex for quantitative analysis of L-tryptophan in real sleep-improving capsules resulted in good recovery. The L-tryptophan level of the Elining capsule was determined at 190.8 ± 10.5 mg/g (mg L-tryptophan/g medicine), which is close to the announced quantity of 180 mg/g. Besides, the SDPA-Cu2+ complex can selectively detect free L-Try molecules and L-Try residues in proteins.
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Affiliation(s)
- Arul Pundi
- Department of Chemical Engineering, Feng Chia University, 100, Wenhwa Road, Seatwen, Taichung 40724, Taiwan ROC
| | - Chi-Jung Chang
- Department of Chemical Engineering, Feng Chia University, 100, Wenhwa Road, Seatwen, Taichung 40724, Taiwan ROC.
| | - Jemkun Chen
- Department of Materials Science and Engineering, National Taiwan University of Science and Technology, 43, Sec.4, Keelung Rd, Taipei 106, Taiwan, ROC
| | - Shih-Rong Hsieh
- Cardiovascular Center, Taichung Tzu Chi Hospital, 88, Sec. 1, Fengxing Road, Tanzi, Taichung 427, Taiwan, ROC
| | - Ming-Ching Lee
- Department of Surgery, Taichung Veterans General Hospital, 1650 Taiwan Boulevard Section 4, Taichung 40705, Taiwan, ROC
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2
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da Silva JL, Delfino JR, Stradiotto NR. Underivatized amino acids detection by anion-exchange chromatography coupled to a nanostructured detector. J Chromatogr B Analyt Technol Biomed Life Sci 2021; 1174:122733. [PMID: 33991824 DOI: 10.1016/j.jchromb.2021.122733] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2020] [Revised: 04/13/2021] [Accepted: 04/21/2021] [Indexed: 10/21/2022]
Abstract
This work reports the development of a fast and reliable amperometric sensor for the detection of amino acids. The detector was constructed using copper nanoparticles (CuNPs) supported on reduced graphene oxide (RGO) modified glassy carbon electrode (CuNPs-RGO/GCE) and based on the application of high performance anion-exchange chromatography with pulsed amperometric detection (HPAEC-PAD). Under optimized isocratic HPAEC-PAD conditions (using 40 mmol L-1 NaOH as mobile phase, flow rate of 0.30 mL min-1 and detection potential of 0.45 V vs. Pd/PdO), the linear dynamic ranges of the concentration of amino acids obtained were 0.50-50 µmol L-1 for lysine, 1.0-100 µmol L-1 for alanine, glycine and serine, and 5.0-100 µmol L-1 for leucine. The limits of detection (S/N = 3) obtained ranged from 0.10 (for lysine and leucine) to 0.50 µmol L-1 (for alanine, glycine and serine) and sensitivity varied from 6.1 (for leucine) to 21.5 nA µmol-1 L (for serine). The average recovery percentages ranged from 97% (for glycine) to 102% (for leucine and serine). The results obtained showed that the CuNPs-RGO/GCE has good long-term stability, repeatability and reproducibility; this makes the device suitable for application as an electrochemical detector. The successful application of the proposed method for the analysis of sugarcane vinasse demonstrates its suitability for separation and determination of amino acids in complex matrices.
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Affiliation(s)
- José Luiz da Silva
- Analytical Chemistry Department, Institute of Chemistry, São Paulo State University (UNESP), Araraquara 14800-060, São Paulo State, Brazil; Bioenergy Research Institute, São Paulo State University (UNESP), Araraquara 14800-060, São Paulo State, Brazil.
| | - José Rodrigues Delfino
- Analytical Chemistry Department, Institute of Chemistry, São Paulo State University (UNESP), Araraquara 14800-060, São Paulo State, Brazil; Bioenergy Research Institute, São Paulo State University (UNESP), Araraquara 14800-060, São Paulo State, Brazil
| | - Nelson Ramos Stradiotto
- Analytical Chemistry Department, Institute of Chemistry, São Paulo State University (UNESP), Araraquara 14800-060, São Paulo State, Brazil; Bioenergy Research Institute, São Paulo State University (UNESP), Araraquara 14800-060, São Paulo State, Brazil
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3
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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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4
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Poveda J. Biogenic amines and free amino acids in craft beers from the Spanish market: A statistical approach. Food Control 2019. [DOI: 10.1016/j.foodcont.2018.09.012] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/01/2022]
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5
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Luo T, Ke J, Xie Y, Dong Y. Determination of underivatized amino acids to evaluate quality of beer by capillary electrophoresis with online sweeping technique. J Food Drug Anal 2017; 25:789-797. [PMID: 28987354 PMCID: PMC9328872 DOI: 10.1016/j.jfda.2017.03.003] [Citation(s) in RCA: 15] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/29/2016] [Revised: 03/01/2017] [Accepted: 03/03/2017] [Indexed: 11/06/2022] Open
Abstract
Capillary electrophoresis (CE) with ultraviolet detection was applied to determine underivatized amino acids in beer, based on the coordination interaction of copper ions and amino acids. An online sweeping technique was combined with CE to improve detection sensitivity. Using the United Nations Food Agriculture Organization/World Health Organization model of essential amino acid pattern and flavor of amino acids, the quality and taste in three kinds of beer were evaluated. It was found that Beer2 had higher quality than the other two kinds and the content of phenylalanine, proline, serine, and isoleucine was relatively large in all three kinds of beers with a great influence on beer flavor. Optimal conditions for separation were as follows: 50mM CuSO4 at pH 4.40 as buffer; total length of fused silica capillary, 73 cm; effective length, 65 cm; separation voltage, 22.5 kV; and optimized sweeping condition, 70 seconds. In the appropriate range, linearity (r2 > 0.9989), precision with a relative standard deviation < 8.05% (n = 5), limits of detection (0.13–0.25 μg/mL), limit of quantification (0.43–0.83 μg/mL), and recovery (80.5–115.8%) were measured. This method was shown to be applicable to the separation of amino acids in beer and to perform quantitative analysis directly without derivatization for the first time.
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6
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Determination of amino acids in sugarcane vinasse by ion chromatographic using nickel nanoparticles on reduced graphene oxide modified electrode. Microchem J 2017. [DOI: 10.1016/j.microc.2017.07.007] [Citation(s) in RCA: 21] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/17/2022]
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7
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Revenga-Parra M, Martínez-Periñán E, Moreno B, Pariente F, Lorenzo E. Rapid taurine and lactate biomarkers determination with disposable electrochemical detectors. Electrochim Acta 2017. [DOI: 10.1016/j.electacta.2017.04.100] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
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8
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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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9
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Gao J, Helmus R, Cerli C, Jansen B, Wang X, Kalbitz K. Robust analysis of underivatized free amino acids in soil by hydrophilic interaction liquid chromatography coupled with electrospray tandem mass spectrometry. J Chromatogr A 2016; 1449:78-88. [DOI: 10.1016/j.chroma.2016.04.071] [Citation(s) in RCA: 27] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2015] [Revised: 03/24/2016] [Accepted: 04/25/2016] [Indexed: 12/14/2022]
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10
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A rapid hydrolysis method and DABS-Cl derivatization for complete amino acid analysis of octreotide acetate by reversed phase HPLC. Amino Acids 2015; 47:2255-63. [DOI: 10.1007/s00726-015-1999-9] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/04/2015] [Accepted: 04/27/2015] [Indexed: 10/23/2022]
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11
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Konn C, Magnér J, Charlou JL, Holm NG, Alsberg T. A Method for Detection of Trace Concentrations of Underivatized Amino Acid in Hydrothermal Fluids by Ion-Pairing Reversed-Phase UPLC-ESI-QTOF-MS. ACTA ACUST UNITED AC 2015. [DOI: 10.4236/ajac.2015.64030] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
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12
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Chen X, Gao D, Liu F, Gao X, Wang S, Zhao Y, Liu H, Jiang Y. A novel quantification method for analysis of twenty natural amino acids in human serum based on N-phosphorylation labeling using reversed-phase liquid chromatography-tandem mass spectrometry. Anal Chim Acta 2014; 836:61-71. [PMID: 24974871 DOI: 10.1016/j.aca.2014.05.053] [Citation(s) in RCA: 29] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/27/2013] [Revised: 05/27/2014] [Accepted: 05/29/2014] [Indexed: 11/29/2022]
Abstract
A novel method based on the strategy of N-phosphorylation labeling is described for quantification of twenty natural amino acids in human serum by reversed-phase liquid chromatography-electrospray tandem mass spectrometry (RP-LC/ESI-MS). The derivatization reaction was easily performed in one-pot reaction under mild conditions within 30min. The reaction mixture was then evaporated to dryness, redissolved, desalted by C18 SPE. The twenty N-phosphoryl amino acids were separated on an RP-C18 column within 20min by isocratic elution (0.1% formic acid-acetonitrile, v/v 7:3). At the same time, multiple reaction monitoring (MRM) MS enabled quantitation of twenty natural amino with the LOD of 0.0005-0.15μM and LOQ of 0.0020-0.5μM in human serum. The linear range was from 0.025 to 25μM (except Cys and Trp) with R>0.99. The recovery range was determined to be 85.5-117.4% with the relative standard deviation (RSD) in the range of 1.3-13.9%. All twenty amino acids were successfully detected in human serum samples with the concentration from 5.7 to 577.9μM, which indicates potential of the developed method for determination of amino acids in complex biological samples, hence for screening of amino acid metabolite related diseases.
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Affiliation(s)
- Xiaowu Chen
- Department of Chemistry, Tsinghua University, Beijing 100084, China; Key Laboratory of Metabolomics at Shenzhen, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China; State Key Laboratory Breeding Base-Shenzhen Key Laboratory of Chemical Biology, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China
| | - Dan Gao
- Key Laboratory of Metabolomics at Shenzhen, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China; State Key Laboratory Breeding Base-Shenzhen Key Laboratory of Chemical Biology, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China
| | - Feng Liu
- Key Laboratory of Metabolomics at Shenzhen, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China; State Key Laboratory Breeding Base-Shenzhen Key Laboratory of Chemical Biology, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China
| | - Xiang Gao
- School of Pharmaceutical Sciences, Xiamen University, Xiamen 361102, China
| | - Shujuan Wang
- Key Laboratory of Metabolomics at Shenzhen, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China; State Key Laboratory Breeding Base-Shenzhen Key Laboratory of Chemical Biology, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China
| | - Yufen Zhao
- State Key Laboratory Breeding Base-Shenzhen Key Laboratory of Chemical Biology, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China
| | - Hongxia Liu
- Key Laboratory of Metabolomics at Shenzhen, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China; State Key Laboratory Breeding Base-Shenzhen Key Laboratory of Chemical Biology, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China.
| | - Yuyang Jiang
- State Key Laboratory Breeding Base-Shenzhen Key Laboratory of Chemical Biology, Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China; School of Medicine, Tsinghua University, Beijing 100084, China.
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13
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Yao X, Zhou G, Tang Y, Pang H, Qian Y, Guo S, Mo X, Zhu S, Su S, Qian D, Jin C, Qin Y, Duan JA. Direct determination of underivatized amino acids from Ginkgo biloba leaves by using hydrophilic interaction ultra high performance liquid chromatography coupled with triple quadrupole mass spectrometry. J Sep Sci 2014; 36:2878-87. [PMID: 24006296 DOI: 10.1002/jssc.201201045] [Citation(s) in RCA: 20] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/14/2012] [Revised: 01/12/2013] [Accepted: 01/12/2013] [Indexed: 11/07/2022]
Abstract
Ginkgo biloba leaf extract has been widely used in dietary supplements and more recently in some foods and beverages. In addition to the well-known flavonol glycosides and terpene lactones, G. biloba leaves are also rich in amino acids. To determine the content of free amino acids, a reliable method has been established by using hydrophilic interaction ultra-HPLC coupled with ESI-MS. 20 free amino acids were simultaneously determined without derivatization in 12 min. The proposed method was fully validated in terms of linearity, sensitivity, repeatability, as well as recovery. Furthermore, the principal component analysis was applied to different G. biloba leaves collected in November (after fruit harvest season), which revealed that the samples from different production areas exhibited regional disparity in different clusters in accordance with their various hydrophilic interaction chromatograms coupled with mass profiles. The established approach could be helpful for evaluation of the potential values as dietary supplements and the quality control of G. biloba leaves, which might also be utilized for the investigation of other medicinal herbs containing amino acids.
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Affiliation(s)
- Xin Yao
- Jiangsu Key Laboratory for High Technology of TCM Formulae Research, Nanjing University of Chinese Medicine, Nanjing, China
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14
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Yao X, Zhou G, Tang Y, Guo S, Qian D, Duan JA. HILIC-UPLC-MS/MS combined with hierarchical clustering analysis to rapidly analyze and evaluate nucleobases and nucleosides inGinkgo bilobaleaves. Drug Test Anal 2014; 7:150-7. [DOI: 10.1002/dta.1634] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/15/2013] [Revised: 01/15/2014] [Accepted: 02/10/2014] [Indexed: 11/10/2022]
Affiliation(s)
- Xin Yao
- Jiangsu Collaborative Innovation Center of Chinese Medicinal Resources Industrialization; Nanjing University of Chinese Medicine; Nanjing 210046 China
- Department of Pharmacy; First Affiliated Hospital of Soochow University; Suzhou 215006 China
| | - Guisheng Zhou
- Jiangsu Collaborative Innovation Center of Chinese Medicinal Resources Industrialization; Nanjing University of Chinese Medicine; Nanjing 210046 China
| | - Yuping Tang
- Jiangsu Collaborative Innovation Center of Chinese Medicinal Resources Industrialization; Nanjing University of Chinese Medicine; Nanjing 210046 China
| | - Sheng Guo
- Jiangsu Collaborative Innovation Center of Chinese Medicinal Resources Industrialization; Nanjing University of Chinese Medicine; Nanjing 210046 China
| | - Dawei Qian
- Jiangsu Collaborative Innovation Center of Chinese Medicinal Resources Industrialization; Nanjing University of Chinese Medicine; Nanjing 210046 China
| | - Jin-ao Duan
- Jiangsu Collaborative Innovation Center of Chinese Medicinal Resources Industrialization; Nanjing University of Chinese Medicine; Nanjing 210046 China
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15
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Douša M, Srbek J, Stránský Z, Gibala P, Nováková L. Retention behavior of a homologous series and positional isomers of aliphatic amino acids in hydrophilic interaction chromatography. J Sep Sci 2014; 37:739-47. [DOI: 10.1002/jssc.201301348] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2013] [Revised: 01/15/2014] [Accepted: 01/15/2014] [Indexed: 11/10/2022]
Affiliation(s)
- Michal Douša
- Zentiva, k.s. Praha U Kabelovny 130, Praha 10 Czech Republic
| | - Jan Srbek
- Zentiva, k.s. Praha U Kabelovny 130, Praha 10 Czech Republic
| | - Zdeněk Stránský
- Department of analytical chemistryRCPTM, Faculty of SciencePalacký University 17.listopadu 12 Olomouc Czech Republic
| | - Petr Gibala
- Zentiva, k.s. Praha U Kabelovny 130, Praha 10 Czech Republic
| | - Lucie Nováková
- Department of analytical chemistryCharles UniversityFaculty of Pharmacy Heyrovského 1203 Hradec Králové Czech Republic
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16
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Guo S, Duan JA, Qian D, Tang Y, Qian Y, Wu D, Su S, Shang E. Rapid determination of amino acids in fruits of Ziziphus jujuba by hydrophilic interaction ultra-high-performance liquid chromatography coupled with triple-quadrupole mass spectrometry. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2013; 61:2709-19. [PMID: 23413770 DOI: 10.1021/jf305497r] [Citation(s) in RCA: 90] [Impact Index Per Article: 8.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/09/2023]
Abstract
In this study, a sensitive and rapid method for the simultaneous determination of free amino acids without derivatization using hydrophilic interaction liquid chromatography coupled with tandem mass spectrometry (HILIC-MS/MS) was developed. The method was performed on an ultra-high-performance liquid chromatography (UHPLC) separation system coupled with a triple-quadrupole mass spectrometry (TQ-MS) instrument. Sufficient separation of 23 underivatized amino acids was achieved on an Acquity BEH Amide column (2.1 mm × 100 mm, 1.7 μm) in a single run of 12 min. Then the method was applied for the analysis of the free amino acids in 46 batches of Ziziphus jujuba fruits which comprised 39 cultivars from 26 cultivation regions. Multivariate statistical analysis was also used to investigate the differences in free amino acid profiles among the samples. This study showed that HILIC-UHPLC-TQ-MS is an effective technique to analyze underivatized amino acids in the food samples.
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Affiliation(s)
- Sheng Guo
- Jiangsu Key Laboratory for High Technology Research of TCM Formulae and ‡Research Center of Basic Medical College, Nanjing University of Chinese Medicine , Nanjing 210046, People's Republic of China
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17
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Zhang X, Zhao T, Cheng T, Liu X, Zhang H. Rapid resolution liquid chromatography (RRLC) analysis of amino acids using pre-column derivatization. J Chromatogr B Analyt Technol Biomed Life Sci 2012; 906:91-5. [DOI: 10.1016/j.jchromb.2012.08.030] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2012] [Revised: 08/25/2012] [Accepted: 08/25/2012] [Indexed: 11/25/2022]
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18
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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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19
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Douša M, Gibala P, Lemr K. Liquid chromatographic separation of pregabalin and its possible impurities with fluorescence detection after postcolumn derivatization with o-phtaldialdehyde. J Pharm Biomed Anal 2010; 53:717-22. [DOI: 10.1016/j.jpba.2010.04.008] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/27/2009] [Revised: 03/30/2010] [Accepted: 04/08/2010] [Indexed: 10/19/2022]
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20
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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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21
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Kabelová I, Dvořáková M, Čížková H, Dostálek P, Melzoch K. Determination of free amino acids in beers: A comparison of Czech and foreign brands. J Food Compost Anal 2008. [DOI: 10.1016/j.jfca.2008.06.007] [Citation(s) in RCA: 56] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
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22
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Simultaneous analysis of riboflavin and aromatic amino acids in beer using fluorescence and multivariate calibration methods. Anal Chim Acta 2008; 613:207-17. [DOI: 10.1016/j.aca.2008.02.063] [Citation(s) in RCA: 66] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/13/2007] [Revised: 02/27/2008] [Accepted: 02/28/2008] [Indexed: 11/21/2022]
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Simultaneous determination of L-arginine and 12 molecules participating in its metabolic cycle by gradient RP-HPLC method: application to human urine samples. Anal Chim Acta 2007; 605:205-17. [PMID: 18036385 DOI: 10.1016/j.aca.2007.10.033] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2007] [Revised: 10/18/2007] [Accepted: 10/19/2007] [Indexed: 12/24/2022]
Abstract
We have developed and described a highly sensitive, accurate and precise reversed-phase high-performance liquid chromatography (RP-HPLC) method for the simultaneous determination of L-arginine and 12 molecules participating in its metabolic cycle in human urine samples. After pre-column derivatization with ortho-phthaldialdehyde (OPA) reagent containing 3-mercaptopropionic acid (3MPA), the fluorescent derivatives were separated by a gradient elution and detected by fluorescence measurement at 338 nm (excitation) and 455 nm (emission). L-Arginine (ARG) and its metabolites: L-glutamine (GLN), N(G)-hydroxy-L-arginine (NOHA), L-citrulline (CIT), N(G)-monomethyl-L-arginine (NMMA), L-homoarginine (HARG), asymmetric N(G),N(G)-dimethyl-L-arginine (ADMA), symmetric N(G),N(G')-dimethyl-L-arginine (SDMA), L-ornithine (ORN), putrescine (PUT), agmatine (AGM), spermidine (SPERMD) and spermine (SPERM) were extracted in a cation-exchange solid-phase extraction (SPE) column and after derivatization separated in a Purospher STAR RP-18e analytical column. The calibration curves of analysed compounds are linear within the range of concentration: 45-825, 0.2-15, 16-225, 12-285, 0.1-32, 15-235, 0.1-12, 0.1-12, 10-205, 0.02-12, 0.1-24, 0.01-10 and 0.01-8 nmol mL(-1) for GLN, NOHA, CIT, ARG, NMMA, HARG, ADMA, SDMA, ORN, PUT, AGM, SPERMD and SPERM, respectively. The correlation coefficients are greater than 0.9980. Coefficients of variation are not higher than 6.0% for inter-day precision. The method has been determined or tested for limits of detection and quantification, linearity, precision, accuracy and recovery. All detection parameters of the method demonstrate that it is a reliable and efficient means of the comprehensive determination of ARG and its 12 main metabolites, making this approach suitable for routine clinical applications. The levels of analysed compounds in human urine can be successfully determined using this developed method with no matrix effect.
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Herzog G, Arrigan DWM. Electrochemical strategies for the label-free detection of amino acids, peptides and proteins. Analyst 2007; 132:615-32. [PMID: 17592579 DOI: 10.1039/b701472d] [Citation(s) in RCA: 88] [Impact Index Per Article: 5.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Electrochemical methods for the detection of amino acids, peptides, and proteins in a variety of media are reviewed. Label-free strategies in which the detection is based on the inherent electrochemical properties of the analyte are discussed. Various processes such as direct or mediated (in solution or immobilised) redox processes and interfacial ion transfers have been employed for the electrochemical detection and determination of the target analytes. The various methods covered encompass voltammetry at uncoated and modified electrodes and at immiscible liquid-liquid interfaces, potentiometry at polymer membrane electrodes and electrochemical impedance spectroscopy. The determination of the target analytes in complex biological matrices is discussed. The various approaches highlighted here illustrate the rich capabilities of electrochemical methods as simple, low-cost, sensitive tools for the determination of these important biological analytes at trace and ultra-trace levels.
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Affiliation(s)
- Grégoire Herzog
- Tyndall National Institute, Lee Maltings, University College, Cork, Ireland
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Yan D, Li G, Xiao XH, Dong XP, Li ZL. Direct determination of fourteen underivatized amino acids from Whitmania pigra by using liquid chromatography-evaporative light scattering detection. J Chromatogr A 2007; 1138:301-4. [PMID: 17134710 DOI: 10.1016/j.chroma.2006.11.035] [Citation(s) in RCA: 35] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/15/2006] [Revised: 10/14/2006] [Accepted: 11/14/2006] [Indexed: 11/25/2022]
Abstract
A new reversed phase high performance liquid chromatography-evaporative light scattering detection (RP-HPLC-ELSD) method has been developed for the direct determination of fourteen amino acids in Whitmania pigra, a commonly used traditional Chinese medicine (TCM). Simultaneous separation of these fourteen amino acids was achieved on a Prevail C18 column. Under the condition of gradient elution, the fourteen amino acids were separated within 25 min. The drift tube temperature of ELSD was set at 115 degrees C, and with the nitrogen flow rate of 2.5 l/min. All calibration curves showed good linear regression (r > 0.9975) within test ranges. The recoveries ranged from 94.8% to 104.4%. The limit of detection (LOD) for each compound was more than 20 mg/l at a signal to noise ratio (S/N) of 3. The validated method was successfully applied to quantify fourteen amino acids from Whitmania pigra, which provides a new basis of overall assessment on quality of Whitmania pigra.
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Affiliation(s)
- Dan Yan
- PLA Institute of Chinese Materia Medica, 302 Hospital of People's Liberation Army, 100 West 4th Ring Middle Road, Beijing, 100039, China
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Ozcan S, Senyuva HZ. Improved and simplified liquid chromatography/atmospheric pressure chemical ionization mass spectrometry method for the analysis of underivatized free amino acids in various foods. J Chromatogr A 2006; 1135:179-85. [PMID: 17027997 DOI: 10.1016/j.chroma.2006.09.039] [Citation(s) in RCA: 81] [Impact Index Per Article: 4.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2006] [Revised: 09/11/2006] [Accepted: 09/18/2006] [Indexed: 11/23/2022]
Abstract
An improved analytical method which offers rapid, accurate determination and identification of 22 amino acids in a variety of matrices, e.g. baby foods, juices, honey is reported. The amino acids were extracted from the matrixes using acidified water. Simultaneous determination of 22 underivatized amino acids was carried out by a liquid chromatography-mass spectrometry (LC/MS). A narrow-bore column allowed rapid screening and quantitative analysis by positive LC/atmospheric pressure chemical ionization (APCI) MS with only acidified mobile phase. Retention times of the 22 amino acids were in the range of ca. 0.9-7.5 min. Sample preparation without clean-up followed by fast chromatographic analysis allowed the analysis to be completed in <25 min.
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Affiliation(s)
- Süreyya Ozcan
- Food Engineering Department, Hacettepe University, 06532 Beytepe, Ankara, Turkey
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Niwa O. Electroanalytical Chemistry with Carbon Film Electrodes and Micro and Nano-Structured Carbon Film-Based Electrodes. BULLETIN OF THE CHEMICAL SOCIETY OF JAPAN 2005. [DOI: 10.1246/bcsj.78.555] [Citation(s) in RCA: 48] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/12/2022]
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