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Sumida Y, Tsunoda M. Development of a Two-Dimensional Liquid Chromatographic Method for Analysis of Urea Cycle Amino Acids. Molecules 2024; 29:700. [PMID: 38338444 PMCID: PMC10856254 DOI: 10.3390/molecules29030700] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/03/2024] [Revised: 01/22/2024] [Accepted: 01/29/2024] [Indexed: 02/12/2024] Open
Abstract
The urea cycle has been found to be closely associated with certain types of cancers and other diseases such as cardiovascular disease and chronic kidney disease. An analytical method for the precise quantification of urea cycle amino acids (arginine, ornithine, citrulline, and argininosuccinate) by off-line two-dimensional liquid chromatography (2D-LC) combined with fluorescence-based detection was developed. Before analysis, the amino acids were derivatised with 4-fluoro-7-nitro-2,1,3-benzoxadiazole (NBD-F) to obtain NBD-amino acids. The first dimension involved the reversed-phase separation, in which NBD derivatives of urea cycle amino acids were completely separated from each other and mostly separated from the 18 NBD-proteinogenic amino acids. The samples were eluted with stepwise gradient using 0.02% trifluoroacetic acid in water-acetonitrile as the mobile phase. In the second dimension, an amino column was used for the separation of NBD-ornithine, -citrulline, and -argininosuccinate, while a sulfonic acid column was used to separate NBD-arginine. The developed 2D-LC system was used to analyse human plasma samples. The fractions of NBD-urea cycle amino acids obtained in the first dimension were collected manually and introduced into the second dimension. By choosing appropriate mobile phases for the second dimension, each NBD-urea cycle amino acid eluted in the first dimension was well separated from the other proteinogenic amino acids and interference from endogenous substance. This could not be achieved in the first dimension. The urea cycle amino acids in human plasma sample were quantified, and the method was well validated. The calibration curves for each NBD-urea cycle amino acid showed good linearity from 3 (ASA) or 15 (Orn, Cit, and Arg) to 600 nM, with correlation coefficients higher than 0.9969. The intraday and interday precisions were less than 7.9% and 15%, respectively. The 2D-LC system is expected to be useful for understanding the involvement of the urea cycle in disease progression.
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Affiliation(s)
| | - Makoto Tsunoda
- Graduate School of Pharmaceutical Sciences, University of Tokyo, Tokyo 113-0033, Japan
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2
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Zhao R, Huang B, Lu G, Fu S, Ying J, Zhao Y. A Practical Method for Amino Acid Analysis by LC-MS Using Precolumn Derivatization with Urea. Int J Mol Sci 2023; 24:ijms24087332. [PMID: 37108497 PMCID: PMC10138926 DOI: 10.3390/ijms24087332] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2023] [Revised: 04/10/2023] [Accepted: 04/12/2023] [Indexed: 04/29/2023] Open
Abstract
Amino acid (AA) analysis is important in biochemistry, food science, and clinical medicine. However, due to intrinsic limitations, AAs usually require derivatization to improve their separation and determination. Here, we present a liquid chromatography-mass spectrometry (LC-MS) method for the derivatization of AAs using the simple agent urea. The reactions proceed quantitatively under a wide range of conditions without any pretreatment steps. Urea-derivatized products (carbamoyl amino acids) of 20 AAs exhibit better separation on reversed-phase columns and increased response in a UV detector compared to underivatized ones. We applied this approach to AA analysis in complex samples using a cell culture media as a model, and it showed potential for the determination of oligopeptides. This fast, simple, and inexpensive method should be useful for AA analysis in complex samples.
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Affiliation(s)
- Runjin Zhao
- Institute of Drug Discovery Technology, Ningbo University, Ningbo 315211, China
- Qian Xuesen Collaborative Research Center of Astrochemistry and Space Life Sciences, Ningbo University, Ningbo 315211, China
| | - Biling Huang
- Institute of Drug Discovery Technology, Ningbo University, Ningbo 315211, China
- Qian Xuesen Collaborative Research Center of Astrochemistry and Space Life Sciences, Ningbo University, Ningbo 315211, China
| | - Gang Lu
- Institute of Drug Discovery Technology, Ningbo University, Ningbo 315211, China
| | - Songsen Fu
- Institute of Drug Discovery Technology, Ningbo University, Ningbo 315211, China
- Qian Xuesen Collaborative Research Center of Astrochemistry and Space Life Sciences, Ningbo University, Ningbo 315211, China
| | - Jianxi Ying
- Institute of Drug Discovery Technology, Ningbo University, Ningbo 315211, China
- Qian Xuesen Collaborative Research Center of Astrochemistry and Space Life Sciences, Ningbo University, Ningbo 315211, China
| | - Yufen Zhao
- Institute of Drug Discovery Technology, Ningbo University, Ningbo 315211, China
- Qian Xuesen Collaborative Research Center of Astrochemistry and Space Life Sciences, Ningbo University, Ningbo 315211, China
- Department of Chemical Biology, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
- Key Lab of Bioorganic Phosphorus Chemistry & Chemical Biology, Department of Chemistry, Tsinghua University, Beijing 100084, China
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3
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Xu W, Zhong C, Zou C, Wang B, Zhang N. Analytical methods for amino acid determination in organisms. Amino Acids 2020; 52:1071-1088. [PMID: 32857227 DOI: 10.1007/s00726-020-02884-7] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/19/2020] [Accepted: 08/18/2020] [Indexed: 02/07/2023]
Abstract
Amino acids are important metabolites for tissue metabolism, growth, maintenance, and repair, which are basic life necessities. Therefore, summarizing analytical methods for amino acid determination in organisms is important. In the past decades, analytical methods for amino acids have developed rapidly but have not been fully explored. Thus, this article provides reference to analytical methods for amino acids in organisms for food and human research. Present amino acid analysis methods include thin-layer chromatography, high-performance liquid chromatography, liquid chromatography-mass spectrometer, gas chromatography-mass spectrometry, capillary electrophoresis, nuclear magnetic resonance, and amino acid analyzer analysis.
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Affiliation(s)
- Weihua Xu
- Experiment Center for Science and Technology, Shanghai University of Traditional Chinese Medicine, 1200 Cai-lun Rd, Shanghai, 201203, China
- State Key Laboratory of Drug Research and Center for Pharmaceutics Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 501 Hai-ke Rd, Shanghai, 201203, China
- School of Pharmacy, Anhui University of Traditional Chinese Medicine, Anhui, 230013, China
| | - Congcong Zhong
- Experiment Center for Science and Technology, Shanghai University of Traditional Chinese Medicine, 1200 Cai-lun Rd, Shanghai, 201203, China
| | - Chunpu Zou
- School of Basic Medicine, Shanghai University of Traditional Chinese Medicine, Shanghai, 201203, China
| | - Bing Wang
- State Key Laboratory of Drug Research and Center for Pharmaceutics Research, Shanghai Institute of Materia Medica, Chinese Academy of Sciences, 501 Hai-ke Rd, Shanghai, 201203, China.
| | - Ning Zhang
- Experiment Center for Science and Technology, Shanghai University of Traditional Chinese Medicine, 1200 Cai-lun Rd, Shanghai, 201203, China.
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4
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Jiang G, Song J, Hu H, Tong X, Dai F. Evaluation of the silkworm lemon mutant as an invertebrate animal model for human sepiapterin reductase deficiency. ROYAL SOCIETY OPEN SCIENCE 2020; 7:191888. [PMID: 32269807 PMCID: PMC7137946 DOI: 10.1098/rsos.191888] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/08/2019] [Accepted: 02/27/2020] [Indexed: 06/11/2023]
Abstract
Human sepiapterin reductase (SR) deficiency is an inherited disease caused by SPR gene mutations and is a monoamine neurotransmitter disorder. Here, we investigated whether the silkworm lemon mutant could serve as a model of SR deficiency. A point mutation in the BmSPR gene led to a five amino acid deletion at the carboxyl terminus in the lemon mutant. In addition, classical phenotypes seen in SR deficient patients were observed in the lemon mutant, including a normal phenylalanine level, a decreased dopamine and serotonin content, and an increased neopterin level. A recovery test showed that the replenishment of l-dopa significantly increased the dopamine level in the lemon mutant. The silkworm lemon mutant also showed negative behavioural abilities. These results suggest that the silkworm lemon mutant has an appropriate genetic basis and meets the biochemical requirements to be a model of SR deficiency. Thus, the silkworm lemon mutant can serve as a candidate animal model of SR deficiency, which may be helpful in facilitating accurate diagnosis and effective treatment options of SR deficiency.
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Affiliation(s)
| | | | | | | | - Fangyin Dai
- Author for correspondence: Fangyin Dai e-mail:
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5
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Themelis T, Gotti R, Orlandini S, Gatti R. Quantitative amino acids profile of monofloral bee pollens by microwave hydrolysis and fluorimetric high performance liquid chromatography. J Pharm Biomed Anal 2019; 173:144-153. [DOI: 10.1016/j.jpba.2019.05.031] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2019] [Revised: 05/15/2019] [Accepted: 05/16/2019] [Indexed: 12/17/2022]
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6
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Zhou W, Wang Y, Yang F, Dong Q, Wang H, Hu N. Rapid Determination of Amino Acids of Nitraria tangutorum Bobr. from the Qinghai-Tibet Plateau Using HPLC-FLD-MS/MS and a Highly Selective and Sensitive Pre-Column Derivatization Method. Molecules 2019; 24:E1665. [PMID: 31035340 PMCID: PMC6539371 DOI: 10.3390/molecules24091665] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/08/2019] [Revised: 04/22/2019] [Accepted: 04/26/2019] [Indexed: 11/16/2022] Open
Abstract
Amino acids are indispensable components of living organisms. The high amino acid content in Nitraria tangutorum Bobr. fruit distinguishes it from other berry plants and is of great significance to its nutritional value. Herein, using 10-ethyl-acridine-3-sulfonyl chloride as a fluorescent pre-column labeling reagent, a method for the efficient and rapid determination of amino acid content in N. tangutorum by pre-column fluorescence derivatization and on-line mass spectrometry was established and further validated. The limits of detection (signal-to-noise ratio = 3) were between 0.13 and 1.13 nmol/L, with a linear coefficient greater than 0.997 and a relative standard deviation between 1.37% and 2.64%. In addition, the method required a short analysis time, separating 19 amino acids within 20 min. Subsequently, the method was used to analyze the amino acid content of Nitraria tangutorum Bobr. from tissues retrieved from seven regions of the Qinghai-Tibet Plateau. Nitraria tangutorum Bobr. was shown to contain a large amount of amino acids, with the total content and main amino acid varying between the different tissues. This research supports the nutritional evaluation, quality control, and development and utilization of Nitraria tangutorum Bobr.
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Affiliation(s)
- Wu Zhou
- State Key Laboratory of Plateau Ecology and Agriculture, Qinghai University, Xining 810016, China.
- College of Eco-Environmental Engineering, Qinghai University, Xining 810016, China.
| | - Yuwei Wang
- State Key Laboratory of Plateau Ecology and Agriculture, Qinghai University, Xining 810016, China.
| | - Fang Yang
- State Key Laboratory of Plateau Ecology and Agriculture, Qinghai University, Xining 810016, China.
| | - Qi Dong
- Key Laboratory of Tibetan Medicine Research, Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining 810008, China.
- Qinghai Provincial Key Laboratory of Tibetan Medicine Research, Xining 810008, China.
| | - Honglun Wang
- Key Laboratory of Tibetan Medicine Research, Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining 810008, China.
- Qinghai Provincial Key Laboratory of Tibetan Medicine Research, Xining 810008, China.
| | - Na Hu
- Key Laboratory of Tibetan Medicine Research, Northwest Institute of Plateau Biology, Chinese Academy of Sciences, Xining 810008, China.
- Qinghai Provincial Key Laboratory of Tibetan Medicine Research, Xining 810008, China.
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7
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Suzuki R, Funatsu T, Tsunoda M. Identification of methylated tubulin through analysis of methylated lysine. Anal Bioanal Chem 2018; 410:4189-4194. [PMID: 29732499 DOI: 10.1007/s00216-018-1068-9] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2018] [Revised: 03/30/2018] [Accepted: 04/05/2018] [Indexed: 10/17/2022]
Abstract
Post-translational modifications to tubulin such as acetylation and detyrosination play important roles in microtubule functions. Methylation is an important post-translational modification; however, to date, few methylated tubulins have been identified. In the present study, we developed a method for analyzing methylated lysine with the aim of identifying methylated tubulin. This method involves four steps: (1) acid hydrolysis of tubulin into amino acids, (2) selective extraction of methylated lysine using a monolithic-silica disk-packed spin column, (3) fluorescence derivatization of methylated lysine with 4-fluoro-7-nitro-2,1,3-benzoxadiazole (NBD-F), and (4) separation of NBD-methylated lysine on a column consisting of C18, cation and anion ligand, and fluorescence detection. Using the newly developed method, the dimethylation of lysine in tubulin was identified. This new method could be applied to searches for other methylated proteins.
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Affiliation(s)
- Rika Suzuki
- Graduate School of Pharmaceutical Sciences, University of Tokyo, 7-3-1 Hongo Bunkyo-ku, Tokyo, 113-0033, Japan
| | - Takashi Funatsu
- Graduate School of Pharmaceutical Sciences, University of Tokyo, 7-3-1 Hongo Bunkyo-ku, Tokyo, 113-0033, Japan
| | - Makoto Tsunoda
- Graduate School of Pharmaceutical Sciences, University of Tokyo, 7-3-1 Hongo Bunkyo-ku, Tokyo, 113-0033, Japan.
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8
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Song Y, Xu C, Kuroki H, Liao Y, Tsunoda M. Recent trends in analytical methods for the determination of amino acids in biological samples. J Pharm Biomed Anal 2017; 147:35-49. [PMID: 28927726 DOI: 10.1016/j.jpba.2017.08.050] [Citation(s) in RCA: 67] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2017] [Revised: 08/25/2017] [Accepted: 08/26/2017] [Indexed: 12/13/2022]
Abstract
Amino acids are widely distributed in biological fluids and involved in many biological processes, such as the synthesis of proteins, fatty acids, and ketone bodies. The altered levels of amino acids in biological fluids have been found to be closely related to several diseases, such as type 2 diabetes, kidney disease, liver disease, and cancer. Therefore, the development of analytical methods to measure amino acid concentrations in biological samples can contribute to research on the physiological actions of amino acids and the prediction, diagnosis and understanding of diseases. This review describes the analytical methods reported in 2012-2016 that utilized liquid chromatography and capillary electrophoresis coupled with ultraviolet, fluorescence, mass spectrometry, and electrochemical detection. Additionally, the relationship between amino acid concentrations and several diseases is also summarized.
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Affiliation(s)
- Yanting Song
- Key Laboratory of Tropic Biological Resources, Minister of Education, Department of Pharmaceutical Sciences, College of Marine Science, Hainan University, Haikou 570228, China
| | - Chang Xu
- Key Laboratory of Tropic Biological Resources, Minister of Education, Department of Pharmaceutical Sciences, College of Marine Science, Hainan University, Haikou 570228, China
| | - Hiroshi Kuroki
- Graduate School of Pharmaceutical Sciences, University of Tokyo, Tokyo 1130033, Japan
| | - Yiyi Liao
- Key Laboratory of Tropic Biological Resources, Minister of Education, Department of Pharmaceutical Sciences, College of Marine Science, Hainan University, Haikou 570228, China
| | - Makoto Tsunoda
- Graduate School of Pharmaceutical Sciences, University of Tokyo, Tokyo 1130033, Japan.
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9
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Omar MMA, Elbashir AA, Schmitz OJ. Capillary electrophoresis method with UV-detection for analysis of free amino acids concentrations in food. Food Chem 2017; 214:300-307. [DOI: 10.1016/j.foodchem.2016.07.060] [Citation(s) in RCA: 44] [Impact Index Per Article: 6.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/11/2016] [Revised: 06/14/2016] [Accepted: 07/09/2016] [Indexed: 11/25/2022]
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10
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Isokawa M, Takatsuki K, Song Y, Shih K, Nakanishi K, Xie Z, Yoon DH, Sekiguchi T, Funatsu T, Shoji S, Tsunoda M. Liquid Chromatography Chip with Low-Dispersion and Low-Pressure-Drop Turn Structure Utilizing a Distribution-Controlled Pillar Array. Anal Chem 2016; 88:6485-91. [DOI: 10.1021/acs.analchem.6b01201] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Muneki Isokawa
- Graduate
School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, Japan
| | - Katsuya Takatsuki
- Major
in Nano-Science and Nano-Engineering, Waseda University, Tokyo, Japan
| | - Yanting Song
- Graduate
School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, Japan
| | - Kailing Shih
- Major
in Nano-Science and Nano-Engineering, Waseda University, Tokyo, Japan
| | - Kanki Nakanishi
- Major
in Nano-Science and Nano-Engineering, Waseda University, Tokyo, Japan
| | - Zhimin Xie
- Major
in Nano-Science and Nano-Engineering, Waseda University, Tokyo, Japan
| | - Dong Hyun Yoon
- Major
in Nano-Science and Nano-Engineering, Waseda University, Tokyo, Japan
| | - Tetsushi Sekiguchi
- Major
in Nano-Science and Nano-Engineering, Waseda University, Tokyo, Japan
| | - Takashi Funatsu
- Graduate
School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, Japan
| | - Shuichi Shoji
- Major
in Nano-Science and Nano-Engineering, Waseda University, Tokyo, Japan
| | - Makoto Tsunoda
- Graduate
School of Pharmaceutical Sciences, The University of Tokyo, Tokyo, Japan
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11
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Rapid quantitative method for the detection of phenylalanine and tyrosine in human plasma using pillar array columns and gradient elution. Amino Acids 2016; 48:1731-5. [DOI: 10.1007/s00726-016-2248-6] [Citation(s) in RCA: 19] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/12/2016] [Accepted: 04/29/2016] [Indexed: 11/25/2022]
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12
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Akgönüllü S, Yavuz H, Denizli A. Preparation of imprinted cryogel cartridge for chiral separation of l-phenylalanine. ARTIFICIAL CELLS NANOMEDICINE AND BIOTECHNOLOGY 2016; 45:800-807. [PMID: 27132947 DOI: 10.1080/21691401.2016.1175445] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
l-Phe-imprinted cryogel cartridge was prepared for the chiral separation of l-Phe. N-Methacryloyl l-phenylalanine (MAPA) was used as a functional monomer for complexing with l-Phe. The selectivity of the membranes was investigated by using d-Phe, l-Trp, and d-Trp as competitor molecules. The PHEMAPA-l-Trp membranes were 6.4, 4.3, and 5.5 times more selective for l-Phe than d-Phe, l-Trp, and d-Trp, respectively. The PHEMAPA-l-Phe cryogel cartridge was incorporated into the fast protein liquid chromatography (FPLC) equipment and was able to separate D,l-Phe racemic mixture efficiently. The PHEMAPA-l-Phe membranes were shown to be reusable many times without significant loss of the adsorption capacity.
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Affiliation(s)
- Semra Akgönüllü
- a Department of Chemistry , Hacettepe University , Beytepe , Ankara , Turkey
| | - Handan Yavuz
- a Department of Chemistry , Hacettepe University , Beytepe , Ankara , Turkey
| | - Adil Denizli
- a Department of Chemistry , Hacettepe University , Beytepe , Ankara , Turkey
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SONG Y, TAKATSUKI K, SEKIGUCHI T, FUNATSU T, SHOJI S, TSUNODA M. Retention and Bandwidth Predictions by Fast Gradient Elution Chromatography Using a Pillar Array Column. CHROMATOGRAPHY 2016. [DOI: 10.15583/jpchrom.2016.008] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Affiliation(s)
- Yanting SONG
- Graduate School of Pharmaceutical Sciences, University of Tokyo
- Key Laboratory of Tropic Biological Resources, Minister of Education; College of Marine Science, Hainan University
| | | | | | - Takashi FUNATSU
- Graduate School of Pharmaceutical Sciences, University of Tokyo
| | - Shuichi SHOJI
- Major in Nano-Science and Nano-Engineering, Waseda University
| | - Makoto TSUNODA
- Graduate School of Pharmaceutical Sciences, University of Tokyo
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14
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Tomita R, Todoroki K, Machida K, Nishida S, Maruoka H, Yoshida H, Fujioka T, Nakashima M, Yamaguchi M, Nohta H. Assessment of the efficacy of anticancer drugs by amino acid metabolomics using fluorescence derivatization-HPLC. ANAL SCI 2015; 30:751-8. [PMID: 25007935 DOI: 10.2116/analsci.30.751] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
Metabolomic studies conducted for evaluating cancer pathogenesis and progression by monitoring the amino acids metabolic balance hold great promise for assessing current and future anticancer treatments. We performed a comprehensive quantification of 21 amino acids concentrations in cultured human colorectal adenocarcinoma cells treated with the anticancer drugs 5-fluorouracil, irinotecan, and cisplatin. A precolumn fluorescence derivatization-HPLC method involving 6-aminoquinolyl-N-hydroxysuccinimidyl carbamate was used. Amino acid concentration data were analyzed by principal-component analysis and partial least-squares multivariate statistical methods to represent samples on two-dimensional graphs. The hierarchical cluster analysis and linear discriminant analysis were used to classify the samples on the score plots. Unlike the cluster analysis approach, the linear discrimination analysis classification successfully distinguished anticancer drug-treated samples from the untreated controls. Moreover, three candidate amino acids (serine, aspartic acid, and methionine) were identified from the loading plots as potential biomarkers. Our proposed method might be able to evaluate the effectiveness of anticancer therapy even in small laboratories or medical institutions.
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Affiliation(s)
- Ryoko Tomita
- Faculty of Pharmaceutical Sciences, Fukuoka University
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15
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Rapid Analysis of Polar Components in Ophiocordyceps sinensis by Conventional Liquid Chromatography System. CHINESE HERBAL MEDICINES 2014. [DOI: 10.1016/s1674-6384(14)60031-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022] Open
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16
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Recent advances in development and application of derivatization reagents having a benzofurazan structure: a brief overview. Biomed Chromatogr 2014; 28:760-6. [DOI: 10.1002/bmc.3115] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/23/2022]
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17
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Analysis of amino acid composition in proteins of animal tissues and foods as pre-column o-phthaldialdehyde derivatives by HPLC with fluorescence detection. J Chromatogr B Analyt Technol Biomed Life Sci 2014; 964:116-27. [PMID: 24731621 DOI: 10.1016/j.jchromb.2014.03.025] [Citation(s) in RCA: 142] [Impact Index Per Article: 14.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2013] [Revised: 03/21/2014] [Accepted: 03/22/2014] [Indexed: 01/15/2023]
Abstract
Studies of protein nutrition and biochemistry require reliable methods for analysis of amino acid (AA) composition in polypeptides of animal tissues and foods. Proteins are hydrolyzed by 6M HCl (110°C for 24h), 4.2M NaOH (105°C for 20 h), or proteases. Analytical techniques that require high-performance liquid chromatography (HPLC) include pre-column derivatization with 4-chloro-7-nitrobenzofurazan, 9-fluorenyl methylchloroformate, phenylisothiocyanate, naphthalene-2,3-dicarboxaldehyde, 6-aminoquinolyl-N-hydroxysuccinimidyl carbamate, and o-phthaldialdehyde (OPA). OPA reacts with primary AA (except cysteine or cystine) in the presence of 2-mercaptoethanol or 3-mercaptopropionic acid to form a highly fluorescent adduct. OPA also reacts with 4-amino-1-butanol and 4-aminobutane-1,3-diol produced from oxidation of proline and 4-hydroxyproline, respectively, in the presence of chloramine-T plus sodium borohydride at 60°C, or with S-carboxymethyl-cysteine formed from cysteine and iodoacetic acid at 25°C. Fluorescence of OPA derivatives is monitored at excitation and emission wavelengths of 340 and 455 nm, respectively. Detection limits are 50 fmol for AA. This technique offers the following advantages: simple procedures for preparation of samples, reagents, and mobile-phase solutions; rapid pre-column formation of OPA-AA derivatives and their efficient separation at room temperature (e.g., 20-25°C); high sensitivity of detection; easy automation on the HPLC apparatus; few interfering side reactions; a stable chromatography baseline for accurate integration of peak areas; and rapid regeneration of guard and analytical columns. Thus, the OPA method provides a useful tool to determine AA composition in proteins of animal tissues (e.g., skeletal muscle, liver, intestine, placenta, brain, and body homogenates) and foods (e.g., milk, corn grain, meat, and soybean meal).
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