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Isokawa M, Nakanishi K, Kanamori T, Sekiguchi T, Funatsu T, Shoji S, Tsunoda M. Pillar Array Mixer for Postcolumn Derivatization Integrated into Liquid Chromatography-Based Microfluidic Device. Anal Chem 2024. [PMID: 38870183 DOI: 10.1021/acs.analchem.4c01669] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/15/2024]
Abstract
The chemical derivatization of target analytes can enhance the sensitivity and selectivity of separation-based methods for metabolite analysis using microfluidic devices. However, the development of chromatography-based microfluidic devices with integrated derivatization units is challenging. In this study, a novel derivatization unit with a pillar array (PA)-based mixing channel was developed for postcolumn derivatization during on-chip liquid chromatography (LC). The PA mixer enhanced mixing between the derivatization reagents and analytes in the transverse direction, while preventing analyte dispersion in the flow direction. After the concept was confirmed using computational fluid dynamics analysis, microfluidic devices with a LC column and PA mixer were fabricated on a 20 × 20 mm silicon plate. Fluid experiments were performed using a PA mixer with a pillar size of 5 or 10 μm or a hollow-channel mixer, which revealed that the PA mixer enhanced transverse mixing without increasing the width of the analyte peak. Moreover, the developed device enabled the analysis of three amino acids within 40 s by separation via hydrophilic interaction chromatography followed by postcolumn fluorogenic derivatization with naphthalene-2,3-dicarboxaldehyde and fluorescence detection. Our results demonstrate the potential of integrated derivatization units for the development of micrototal analysis systems for use in bioanalysis.
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Affiliation(s)
- Muneki Isokawa
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo 113-0033, Japan
| | - Kanki Nakanishi
- Department of Nanoscience and Nanoengineering, Waseda University, Tokyo 169-8555, Japan
| | - Takahiro Kanamori
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo 113-0033, Japan
| | - Tetsushi Sekiguchi
- Department of Nanoscience and Nanoengineering, Waseda University, Tokyo 169-8555, Japan
| | - Takashi Funatsu
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo 113-0033, Japan
| | - Shuichi Shoji
- Department of Nanoscience and Nanoengineering, Waseda University, Tokyo 169-8555, Japan
| | - Makoto Tsunoda
- Graduate School of Pharmaceutical Sciences, The University of Tokyo, Tokyo 113-0033, Japan
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2
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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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3
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Improvement of an Automated Sample Injection System for Pillar Array Columns to Increase Analytical Reproducibility. Molecules 2022; 27:molecules27154715. [PMID: 35897891 PMCID: PMC9332314 DOI: 10.3390/molecules27154715] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2022] [Revised: 07/18/2022] [Accepted: 07/21/2022] [Indexed: 02/04/2023] Open
Abstract
In our previous study, we developed an automatic sample injection system for pillar array columns for quantitative analysis. An autosampler was used to maintain a constant sample injection volume. However, the sample was diluted during injection using the autosampler, thus deteriorating the analytical reproducibility. In this study, we have substituted the autosampler with a syringe pump to overcome the abovementioned problem and improve the system. Sample dilution was avoided by filling the entire capillary with the sample at a constant rate. This improved system also increased the analytical reproducibility. In the previous system, the relative standard deviation (RSD) exceeded 17% of the peak height for coumarin dyes. In contrast, the improved system decreased the RSD to the range 1.2–1.8%. The analytical reproducibility was evaluated by using five types of amino acids. The RSD of each peak height was within 3.0%, confirming good reproducibility. These results indicate that the sample injection method developed in this study can be applied to biological sample analyses as a simple quantitative analysis method for pillar array columns.
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Naghdi E, De Malsche W. Overloading behavior of fenoprofen and naproxen as two model compounds on a non-porous silicon pillar array column. J Chromatogr A 2021; 1651:462332. [PMID: 34153737 DOI: 10.1016/j.chroma.2021.462332] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2021] [Revised: 05/30/2021] [Accepted: 06/06/2021] [Indexed: 11/25/2022]
Abstract
In this study, the adsorption behavior of naproxen and fenoprofen as two model compounds on a non-porous pillar array column (NPAC) was investigated under reverse phase liquid chromatography conditions. Band profiles of both analytes were recorded in overloaded concentrations using 30% methanol/water (v/v) as the mobile phase. Breakthrough experiments under the same chromatographic condition were carried out to measure the adsorption isotherms. Single-component adsorption isotherm data were acquired by frontal analysis for each analyte. The isotherms were found to be concave upward and downward for naproxen and fenoprofen, respectively. To find the best agreement between the experimental data points and the adsorption isotherm models, the obtained isotherms were modeled using several isotherm models. The Langmuir-Freundlich and anti-Langmuir models provided the best fitting for fenoprofen and naproxen, respectively. The solute and stationary phase properties determine the appropriate model. Adsorbate-adsorbate interaction is important in the case of naproxen, while the adsorbate- adsorbent (stationary phase) plays the main role in retention of fenoprofen on the NPAC. The validity of the selected isotherm models were checked by comparing calculated and experimental band profiles and plate heights. An excellent agreement was observed for the whole concentration range of both analytes, which confirmed the accuracy of the selected models.
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Affiliation(s)
- Elahe Naghdi
- µFlow group, Department of Chemical Engineering, Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussels, Belgium.; Faculty of Chemistry, Shahid Beheshti University, G.C., Tehran, I.R., Iran
| | - Wim De Malsche
- µFlow group, Department of Chemical Engineering, Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussels, Belgium..
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Fujiwara T, Funatsu T, Tsunoda M. Fast analysis using pillar array columns: Quantification of branched-chain α-keto acids in human plasma samples. J Pharm Biomed Anal 2021; 198:114019. [PMID: 33725587 DOI: 10.1016/j.jpba.2021.114019] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/30/2021] [Revised: 03/06/2021] [Accepted: 03/06/2021] [Indexed: 10/22/2022]
Abstract
Branched-chain α-keto acids (BCKAs, namely, α-ketoisovaleric acid (KIV), α-ketoisocaproic acid (KIC), and α-keto-β-methylvaleric acid (KMV)) are related to many diseases such as myeloid leukemia, liver cancer, and diabetes mellitus. A rapid quantitative analytical method for BCKAs using pillar array columns was developed. α-Keto acids were labeled with 1,2-diamino-4,5-methylenedioxybenzene (DMB), followed by their separation on octadecylsilane-treated pillar array columns with MeOH/H2O as the mobile phase. Five DMB-labelled α-keto acids including the internal standard were separated in 160 s. The lower limits of quantification for DMB-α-keto acids were 2-5 μM. The intra- and interday precisions were 2.9-6.6 % and 5.2-10.7 %, respectively. The developed method was applied to BCKA quantification in human plasma samples; KIV, KIC, and KMV concentrations were determined to be 13.8, 24.2, and 15.2 μM, respectively. The method realized rapid, sensitive, and precise analysis of BCKAs and can be applied for clinical diagnosis.
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Affiliation(s)
- Takuya Fujiwara
- Graduate School of Pharmaceutical Sciences, University of Tokyo, Tokyo 1130033, Japan
| | - Takashi Funatsu
- Graduate School of Pharmaceutical Sciences, University of Tokyo, Tokyo 1130033, Japan
| | - Makoto Tsunoda
- Graduate School of Pharmaceutical Sciences, University of Tokyo, Tokyo 1130033, Japan.
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6
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KUROKI H, KOYAMA H, NAKATANI Y, FUNATSU T, HORIIKE S, TSUNODA M. Development of an Automated Sample Injection System for Pillar Array Columns. CHROMATOGRAPHY 2020. [DOI: 10.15583/jpchrom.2019.022] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
Affiliation(s)
- Hiroshi KUROKI
- Graduate School of Pharmaceutical Sciences, University of Tokyo
| | | | | | - Takashi FUNATSU
- Graduate School of Pharmaceutical Sciences, University of Tokyo
| | | | - Makoto TSUNODA
- Graduate School of Pharmaceutical Sciences, University of Tokyo
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Naghdi E, Fakhari AR, Baca M, De Malsche W. Simultaneous enantioseparation of nonsteroidal anti-inflammatory drugs by a one-dimensional liquid chromatography technique using a dynamically coated chiral porous silicon pillar array column. J Chromatogr A 2019; 1615:460752. [PMID: 31839355 DOI: 10.1016/j.chroma.2019.460752] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2019] [Revised: 11/02/2019] [Accepted: 11/28/2019] [Indexed: 01/03/2023]
Abstract
The preparation of a highly efficient chiral liquid chromatography (LC) column is explored by dynamically coating a reversed-phase porous silicon pillar array column with hydroxypropyl-β-cyclodextrin (Hp-β-CD) as the chiral selector. Analyte mixtures composed of non-steroidal anti-inflammatory drugs were tested to reveal the enantioseparation potential of the column. The mechanism of chiral discrimination was investigated. The adsorbed Hp-β-CDs on the column surface experience different interaction with enantiomers. The chiral stationary phase showed satisfying stability and could be easily restored by recovering the selector with sufficient flushing and repeating the loading procedure. The peak capacity of the column was evaluated, and it was found high enough to separate three enantiomer couples using a one-dimensional LC technique.
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Affiliation(s)
- Elahe Naghdi
- Faculty of Chemistry, Shahid Beheshti University, G.C., Tehran, Iran; µFlow Group, Department of Chemical Engineering, Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussels, Belgium
| | - Ali Reza Fakhari
- Faculty of Chemistry, Shahid Beheshti University, G.C., Tehran, Iran
| | - Martyna Baca
- µFlow Group, Department of Chemical Engineering, Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussels, Belgium
| | - Wim De Malsche
- µFlow Group, Department of Chemical Engineering, Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussels, Belgium.
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8
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Phenylalanine Photoinduced Fluorescence and Characterization of the Photoproducts by LC-MS. J Fluoresc 2019; 29:1445-1455. [DOI: 10.1007/s10895-019-02449-2] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/06/2019] [Accepted: 10/01/2019] [Indexed: 10/25/2022]
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9
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Miggiels P, Wouters B, van Westen GJ, Dubbelman AC, Hankemeier T. Novel technologies for metabolomics: More for less. Trends Analyt Chem 2019. [DOI: 10.1016/j.trac.2018.11.021] [Citation(s) in RCA: 21] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/16/2022]
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10
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LI X, KUROKI H, FUNATSU T, TSUNODA M. Retention of Fluorescent Amino Acid Derivatives in Ion-pairing Reversed-phase Liquid Chromatography. ANAL SCI 2018; 34:1209-1212. [DOI: 10.2116/analsci.18n008] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- Xiaomin LI
- Graduate School of Pharmaceutical Sciences, The University of Tokyo
| | - Hiroshi KUROKI
- Graduate School of Pharmaceutical Sciences, The University of Tokyo
| | - Takashi FUNATSU
- Graduate School of Pharmaceutical Sciences, The University of Tokyo
| | - Makoto TSUNODA
- Graduate School of Pharmaceutical Sciences, The University of Tokyo
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11
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Mihali C, Petrescu C, Ladaşiu-Ciolacu F, Mândruţiu I, Bechet D, Nistor T, Ardelean A, Benga G. PLASMA PHENYLALANINE DETERMINATION BY QUANTITATIVE DENSITOMETRY OF THIN LAYER CHROMATOGRAMS AND BY HIGH PERFORMANCE LIQUID CHROMATOGRAPHY IN RELATION WITH MODERN MANAGEMENT OF PHENYLKETONURIA. ACTA ENDOCRINOLOGICA (BUCHAREST, ROMANIA : 2005) 2018; 14:556-561. [PMID: 31149312 PMCID: PMC6516402 DOI: 10.4183/aeb.2018.556] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
BACKGROUND The modern management of phenylketonuria (PKU) consists of generalized newborn screening (NBS) for hyperphenylalaninemia (HPA), confirmation of HPA in children detected in the NBS, introduction of dietary treatment in the first weeks of life, followed by monitoring the treatment of PKU for decades to maintain phenylalaninemia within the limits that will not affect the brain. The present study aimed to evaluate the usefulness of two chromatographic methodologies for determination of plasma Phe level in the routine management of PKU: the two dimensional thin layer chromatography (2D - TLC) and the high performance liquid chromatography (HPLC) procedures, respectively. MATERIAL AND METHODS Samples of blood from 23 children with HPA detected by neonatal screening or with confirmed PKU who received treatment by low-Phe diet were analyzed to estimate the plasma Phe level by the two chromatographic procedures. RESULTS In case of three subjects the very low concentrations of plasma Phe could not be detected by the 2D - TLC methodology, since the spot was not visible on the chromatogram. In four patients the differences between the values of plasma Phe determined by the two methodologies are not statistically significant, while in fifteen subjects the differences are highly statistically significant. This is due to the greater errors that appear in the case of 2D - TLC methodology. In the range of concentrations of plasma Phe higher than 360 μmol/L (which is the cut-off value for HPA), although in four cases there were statistically significant differences in the level of plasma Phe determined by the two methodologies, the value obtained by the 2D - TLC methodology was high enough to influence the decision of changing the diet so that HPA is kept under control. In addition, the intense spot of Phe on the 2D - TLC chromatogram may be detected even by un unexperienced laboratory specialist. CONCLUSION The HPLC procedure for measurement of plasma Phe level is very suitable to be used in the routine management of PKU. The 2D - TLC procedure may be accompanied by relatively high errors; however, it detects patients with severe PKU.
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Affiliation(s)
- C.V. Mihali
- ”Vasile Goldiş” Western University of Arad - Institute of Life Sciences, Romania
- ”Vasile Goldiş” Western University of Arad - Faculty of Medicine, Romania
| | - C.M. Petrescu
- ”Vasile Goldiş” Western University of Arad - Institute of Life Sciences, Romania
| | - F.C. Ladaşiu-Ciolacu
- ”Vasile Goldiş” Western University of Arad - Institute of Life Sciences, Romania
| | - I. Mândruţiu
- Cluj County Clinical Emergency Hospital - Laboratory of Genetic Explorations, Romania
| | - D. Bechet
- Cluj County Clinical Emergency Hospital - Laboratory of Genetic Explorations, Romania
| | - T. Nistor
- ”Iuliu Haţieganu” University of Medicine and Pharmacy Cluj-Napoca, Faculty of Medicine, Romania
| | - A. Ardelean
- ”Vasile Goldiş” Western University of Arad - Institute of Life Sciences, Romania
- ”Vasile Goldiş” Western University of Arad - Faculty of Medicine, Romania
| | - Gh. Benga
- ”Vasile Goldiş” Western University of Arad - Faculty of Medicine, Romania
- Cluj County Clinical Emergency Hospital - Laboratory of Genetic Explorations, Romania
- Romanian Academy - Cluj-Napoca Branch, Romania
- The Gheorghe Benga Foundation, Romania
- Academy of Medical Sciences of Romania - Cluj-Napoca Branch, Romania
- The OUTNOBEL Foundation, Cluj-Napoca, Romania
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12
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Haghighi F, Talebpour Z, Nezhad AS. Towards fully integrated liquid chromatography on a chip: Evolution and evaluation. Trends Analyt Chem 2018. [DOI: 10.1016/j.trac.2018.05.002] [Citation(s) in RCA: 33] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
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13
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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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14
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Affiliation(s)
- Xilong Yuan
- Department of Chemistry, Queen's University , Kingston, Ontario K7L 3N6, Canada
| | - Richard D Oleschuk
- Department of Chemistry, Queen's University , Kingston, Ontario K7L 3N6, Canada
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15
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Futagami S, Hara T, Ottevaere H, Baron GV, Desmet G, De Malsche W. Preparation and evaluation of mesoporous silica layers on radially elongated pillars. J Chromatogr A 2017; 1523:234-241. [DOI: 10.1016/j.chroma.2017.06.062] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/01/2017] [Revised: 06/22/2017] [Accepted: 06/23/2017] [Indexed: 11/29/2022]
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16
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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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17
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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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18
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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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