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Maehara S, Kobayashi M, Kuwada M, Choshi T, Inoue H, Hieda Y, Nishiyama T, Hata T. In vitro and in silico studies of potential coronavirus-specific 3C-like protease inhibitors. Chem Pharm Bull (Tokyo) 2021; 70:195-198. [PMID: 34955489 DOI: 10.1248/cpb.c21-01002] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
We investigated similar compounds to ebselen and tideglusib, which exhibit strong activity against severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), using MACCS keys. Four candidate compounds were identified. One of them, phenyl-benzothiazol-3-one, showed coronavirus-specific 3C-like (3CL) protease inhibitory activity. The results indicated that a similarity score above 0.81 is a good indicator of activity for ebselen-and-tideglusib-like compounds. Subsequently, we simulated the ring-cleavage Michael reaction of ebselen at the Se center, which is responsible for its 3CL protease inhibitory activity, and determined the activation free energy of the reaction. The results showed that reaction simulation is a useful tool for estimating the activity of inhibitory compounds that undergo Michael addition reactions with the relevant cysteine S atom of 3CL proteases.
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Affiliation(s)
- Shoji Maehara
- Faculty of Pharmacy and Pharmaceutical Sciences, Fukuyama University
| | - Manami Kobayashi
- Faculty of Pharmacy and Pharmaceutical Sciences, Fukuyama University
| | - Mari Kuwada
- Faculty of Pharmacy and Pharmaceutical Sciences, Fukuyama University
| | - Tominari Choshi
- Faculty of Pharmacy and Pharmaceutical Sciences, Fukuyama University
| | - Hirohumi Inoue
- Faculty of Pharmacy and Pharmaceutical Sciences, Fukuyama University
| | - Yuzou Hieda
- Faculty of Pharmacy and Pharmaceutical Sciences, Fukuyama University
| | - Takashi Nishiyama
- Faculty of Pharmacy and Pharmaceutical Sciences, Fukuyama University
| | - Toshiyuki Hata
- Faculty of Pharmacy and Pharmaceutical Sciences, Fukuyama University
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2
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Sakamoto H, Watanabe K, Koto A, Koizumi G, Satomura T, Watanabe S, Suye SI. A bienzyme electrochemical biosensor for the detection of collagen l-hydroxyproline. SENSING AND BIO-SENSING RESEARCH 2015. [DOI: 10.1016/j.sbsr.2015.03.002] [Citation(s) in RCA: 16] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Indexed: 02/06/2023] Open
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3
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Guan J, Zhang Y, Zhou G, Wang C, Qu Q, Hu X, Wang G. DETERMINATION OF PROLINE, HYDROXYPROLINE, AND N–ETHYLGLYCINE IN URINE BY USING A NEW HPLC LABELING REAGENT, AND ITS APPLICATION IN DETECTION OF TUMOR MARKERS. J LIQ CHROMATOGR R T 2014. [DOI: 10.1080/10826076.2013.807468] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Affiliation(s)
- Jun Guan
- a College of Clinical Medicine , Yangzhou University, Subei Hospital , Yangzhou , China
| | - Yi Zhang
- b College of Chemistry and Chemical Engineering , Yangzhou University , Yangzhou , China
| | - Guiyou Zhou
- b College of Chemistry and Chemical Engineering , Yangzhou University , Yangzhou , China
| | - Chengyin Wang
- b College of Chemistry and Chemical Engineering , Yangzhou University , Yangzhou , China
| | - Qishu Qu
- b College of Chemistry and Chemical Engineering , Yangzhou University , Yangzhou , China
| | - Xiaoya Hu
- b College of Chemistry and Chemical Engineering , Yangzhou University , Yangzhou , China
| | - Guoxiu Wang
- c Department of Chemistry and Forensic Science , University of Technology , Sydney, City Campus, Broadway, Sydney , New South Wales , Australia
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4
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Inoue H, Harada T, Eto S, Nakashima K, Ibusuki T, Kosha K, Date Y, Sanematsu E, Shinohara Y, Takahashi K, Yoshimura R, Nakamura J, Kojima E, Tsuruta Y. Determination of paroxetine in serum treated with simple pretreatment by pre-column high-performance liquid chromatography using 4-(5,6-dimethoxy-2-phthalimidinyl)-2-methoxyphenylsulfonyl chloride as a fluorescent labeling reagent. Biomed Chromatogr 2013; 27:688-90. [DOI: 10.1002/bmc.2859] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/29/2012] [Revised: 11/26/2012] [Accepted: 11/27/2012] [Indexed: 11/06/2022]
Affiliation(s)
- Hirofumi Inoue
- Faculty of Pharmacy and Pharmaceutical Sciences; Fukuyama University; Fukuyama; Hiroshima; 729-0292; Japan
| | - Takuya Harada
- Faculty of Pharmacy and Pharmaceutical Sciences; Fukuyama University; Fukuyama; Hiroshima; 729-0292; Japan
| | - Seiji Eto
- Faculty of Pharmacy and Pharmaceutical Sciences; Fukuyama University; Fukuyama; Hiroshima; 729-0292; Japan
| | - Ken Nakashima
- Faculty of Pharmacy and Pharmaceutical Sciences; Fukuyama University; Fukuyama; Hiroshima; 729-0292; Japan
| | - Takuya Ibusuki
- Faculty of Pharmacy and Pharmaceutical Sciences; Fukuyama University; Fukuyama; Hiroshima; 729-0292; Japan
| | - Keiko Kosha
- Faculty of Pharmacy and Pharmaceutical Sciences; Fukuyama University; Fukuyama; Hiroshima; 729-0292; Japan
| | - Yuuko Date
- Faculty of Pharmacy and Pharmaceutical Sciences; Fukuyama University; Fukuyama; Hiroshima; 729-0292; Japan
| | - Emiko Sanematsu
- Department of Hospital Pharmacy, School of Medicine; University of Occupational and Environmental Health; Kitakyuushu; Fukuoka; 807-8555; Japan
| | - Yoshitake Shinohara
- Department of Hospital Pharmacy, School of Medicine; University of Occupational and Environmental Health; Kitakyuushu; Fukuoka; 807-8555; Japan
| | - Kojiro Takahashi
- Department of Hospital Pharmacy, School of Medicine; University of Occupational and Environmental Health; Kitakyuushu; Fukuoka; 807-8555; Japan
| | - Reiji Yoshimura
- Department of Psychiatry, School of Medicine; University of Occupational and Environmental Health; Kitakyuushu; Fukuoka; 807-8555; Japan
| | - Jun Nakamura
- Department of Psychiatry, School of Medicine; University of Occupational and Environmental Health; Kitakyuushu; Fukuoka; 807-8555; Japan
| | - Eijiro Kojima
- Faculty of Pharmacy and Pharmaceutical Sciences; Fukuyama University; Fukuyama; Hiroshima; 729-0292; Japan
| | - Yasuto Tsuruta
- Faculty of Pharmacy and Pharmaceutical Sciences; Fukuyama University; Fukuyama; Hiroshima; 729-0292; Japan
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Inoue H, Sakata Y, Nishio H, Tokumo K, Kojima E, Date Y, Tamura Y, Tsuruta Y. A Simple and Highly Sensitive HPLC Method with Fluorescent Detection for Determination of Pipecolic Acid in Mouse Brain Areas. Biol Pharm Bull 2011; 34:287-9. [DOI: 10.1248/bpb.34.287] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Affiliation(s)
- Hirofumi Inoue
- Faculty of Pharmacy and Pharmaceutical Sciences, Fukuyama University
| | - Yasuhiko Sakata
- Faculty of Pharmacy and Pharmaceutical Sciences, Fukuyama University
| | - Hiroaki Nishio
- Faculty of Pharmacy and Pharmaceutical Sciences, Fukuyama University
| | - Kohji Tokumo
- Faculty of Pharmacy and Pharmaceutical Sciences, Fukuyama University
| | - Eijiro Kojima
- Faculty of Pharmacy and Pharmaceutical Sciences, Fukuyama University
| | - Yuuko Date
- Faculty of Pharmacy and Pharmaceutical Sciences, Fukuyama University
| | - Yutaka Tamura
- Faculty of Pharmacy and Pharmaceutical Sciences, Fukuyama University
| | - Yasuto Tsuruta
- Faculty of Pharmacy and Pharmaceutical Sciences, Fukuyama University
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6
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Tsuruta Y, Maruyama K, Inoue H, Kosha K, Date Y, Okamura N, Eto S, Kojima E. Sensitive determination of carnosine in urine by high-performance liquid chromatography using 4-(5,6-dimethoxy-2-phthalimidinyl)-2-methoxyphenylsulfonyl chloride as a fluorescent labeling reagent. J Chromatogr B Analyt Technol Biomed Life Sci 2010; 878:327-32. [DOI: 10.1016/j.jchromb.2009.11.038] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/31/2009] [Revised: 11/16/2009] [Accepted: 11/20/2009] [Indexed: 10/20/2022]
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TSURUTA Y, MATSUMOTO M, INOUE H, MUNEMURA S, YAMANO S, IGUCHI H. Determination of N-Ethylglycine in Urine of Cancer Patients with Metastatic Bone Disease by HPLC Using 4-(5,6-Dimethoxy-2-phthalimidinyl)-2-methoxyphenylsulfonyl Chloride as a Fluorescent Labeling Reagent. ANAL SCI 2008; 24:1629-31. [DOI: 10.2116/analsci.24.1629] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- Yasuto TSURUTA
- Faculty of Pharmacy and Pharmaceutical Sciences, Fukuyama University
| | - Maya MATSUMOTO
- Faculty of Pharmacy and Pharmaceutical Sciences, Fukuyama University
| | - Hirofumi INOUE
- Faculty of Pharmacy and Pharmaceutical Sciences, Fukuyama University
| | - Sayaka MUNEMURA
- Faculty of Pharmacy and Pharmaceutical Sciences, Fukuyama University
| | | | - Haruo IGUCHI
- Institute for Clinical Research, Shikoku Cancer Center
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Russell JD, Dolphin JM, Koppang MD. Selective Analysis of Secondary Amino Acids in Gelatin Using Pulsed Electrochemical Detection. Anal Chem 2007; 79:6615-21. [PMID: 17683165 DOI: 10.1021/ac070819w] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Abstract
A method was developed for selective analysis of the secondary amino acids proline and 4-hydroxyproline from gelatin hydrolysates using anion-exchange high-performance liquid chromatography followed by integrated pulsed amperometric detection (HPLC-IPAD). An extraction scheme was implemented prior to HPLC-IPAD analysis to isolate the secondary amino acids by the removal of primary amino acids through derivatization with o-phthalaldehyde followed by solid-phase extraction with C18 packed columns. The use of the IPAD technique eliminated the need for a second derivatization step to detect secondary amino acids. The removal of interfering primary amino acids prior to chromatographic analysis allowed the use of isocratic mobile-phase conditions to achieve effective and efficient separation of the amino acids. This led to a more precise and accurate quantitation of their content in gelatin hydrolysates. Detection limits approach 10 parts per billion ( approximately 2 pmol/injection) with a chromatographic analysis time under 8 min. The ratios of secondary amino acids, in addition to their abundances, were used to distinguish gelatin manufactured from bovine, porcine, and fish raw material sources.
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Affiliation(s)
- Jason D Russell
- Department of Chemistry, University of South Dakota, Vermillion, SD 57069, USA
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Langrock T, García-Villar N, Hoffmann R. Analysis of hydroxyproline isomers and hydroxylysine by reversed-phase HPLC and mass spectrometry. J Chromatogr B Analyt Technol Biomed Life Sci 2007; 847:282-8. [PMID: 17085085 DOI: 10.1016/j.jchromb.2006.10.015] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/24/2006] [Revised: 10/05/2006] [Accepted: 10/12/2006] [Indexed: 11/22/2022]
Abstract
Collagens, the most abundant mammalian proteins, contain a high content of hydroxylated amino acids, such as, 3- and 4-cis-/trans-hydroxyproline (Hyp) and 5-hydroxylysine (Hyl). Whereas the global content of 4-Hyp was studied by amino acid analysis, no technique to determine all five hydroxyamino acids simultaneously in collagens has been reported. Here, we report the separation of all five hydroxyamino acids as well as two Hyp epimers from all other proteinogenic amino acids after derivatization with N(2)-(5-fluoro-2,4-dinitrophenyl)-l-valine amide (l-FDVA) by RPC-UV-ESI-MS. The general applicability of this method is shown for three Hyp-containing peptides as well as collagen type I.
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Affiliation(s)
- Tobias Langrock
- Institute of Bioanalytical Chemistry, Center for Biotechnology and Biomedicine (BBZ), Faculty of Chemistry and Mineralogy, University of Leipzig, Deutscher Platz 5, 04103 Leipzig, Germany
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Tsuruta Y, Matsumoto M, Inoue H, Munemura S, Ishizu T, Yamano S, Iguchi H. Identification of N-ethylglycine in urine of cancer patients with metastatic bone disease. Clin Chim Acta 2007; 376:226-8. [PMID: 16962088 DOI: 10.1016/j.cca.2006.07.023] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2006] [Revised: 07/21/2006] [Accepted: 07/21/2006] [Indexed: 11/30/2022]
Abstract
BACKGROUND Previously, a HPLC method for the determination of N-terminal prolyl dipeptides, proline and hydroxyproline in urine with fluorescence detection after pre-column derivatization with 4-(5,6-dimethoxy-2-phthalimidinyl)-2-methoxyphenylsulfonyl chloride (DMS-Cl) [Inoue H, Iguchi H, Kono A, Tsuruta Y. Highly sensitive determination of N-terminal prolyl dipeptides, proline and hydroxyproline in urine by high-performance liquid chromatography using a new fluorescent labelling reagent, 4-(5,6-dimethoxy-2-phthalimidinyl)-2-methoxyphenylsulfonyl chloride. J Chromatogr 1999;724:221-230] was developed to study the relation between those analytes and bone diseases. When the urinary analytes were measured, a large peak due to an unknown substance was recognized in the chromatograms of cancer patients with metastatic bone disease, although it was scarcely present in normal subjects. In this study, we identified the unknown substance. METHODS The fluorescent fraction based on the unknown substance was collected using HPLC and the structure of the fluorescence product was analyzed with MS, (1)H NMR and (13)C NMR. RESULTS The fluorescence product based on the unknown substance was established to be a DMS-derivative of N-ethylglycine. CONCLUSIONS Excretion of N-ethylglycine in the urine of cancer patients with metastatic bone disease is recognized, although N-ethylglycine is scarcely excreted in the urine of normal subjects.
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Affiliation(s)
- Yasuto Tsuruta
- Faculty of Pharmacy and Pharmaceutical Sciences, Fukuyama University, Fukuyama, Hiroshima 729-0292, Japan.
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11
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Inoue H. Development of Highly Sensitive Determination of Biogenic Compounds by High-performance Liquid Chromatography with Pre-column Fluorescence Derivatization. YAKUGAKU ZASSHI 2006; 126:321-6. [PMID: 16679739 DOI: 10.1248/yakushi.126.321] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
A sensitive fluorescent labeling reagent, 4-(5,6-dimethoxy-2-phthalimidinyl)-2-methoxyphenylsulfonyl chloride (DMS-Cl), for the determination of amino compounds in HPLC was developed. DMS-Cl reacted with amino compounds in the basic medium to produce the corresponding fluorescent sulfonamides (excition 318 nm, emission 406 nm in aqueous acetonitrile). When amino acids were analyzed using reverse-phase HPLC, the detection limits (signal-to-noise ratio = 3) of almost all amino acids labeled with DMS-Cl were less than 5 fmol/injection. DMS-Cl was utilized for highly sensitive determination of amino compounds in biological samples and HPLC methods for determination of prolyl dipeptides, Pro and Hyp, in serum and urine, pipecolic acid in serum, taurine in plasma, and free and N-acetylated polyamine in urine were established. As these proposed methods are highly sensitive and reproducible and require only a small amount of biological sample, they may be useful for clinical and biochemical research.
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Affiliation(s)
- Hirofumi Inoue
- Faculty of Pharmacy and Pharmaceutical Sciences, Fukuyama University, Japan.
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12
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Inoue H, Fukunaga K, Munemura S, Tsuruta Y. Simultaneous determination of free and N-acetylated polyamines in urine by semimicro high-performance liquid chromatography using 4-(5,6-dimethoxy-2-phthalimidinyl)-2-methoxyphenylsulfonyl chloride as a fluorescent labeling reagent. Anal Biochem 2005; 339:191-7. [PMID: 15797558 DOI: 10.1016/j.ab.2005.01.008] [Citation(s) in RCA: 17] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2004] [Indexed: 10/25/2022]
Abstract
We have developed a simple and highly sensitive semimicro high-performance liquid chromatographic method for the simultaneous determination of free and N-acetylated polyamines in urine. Polyamines and N-acetylated polyamines were derivatized with 4-(5,6-dimethoxy-2-phthalimidinyl)-2-methoxyphenylsulfonyl chloride to produce fluorescent sulfonamides. The labeling reaction was carried out at 50 degrees C for 15 min at pH 9. The fluorescent derivatives were separated on a reversed-phase column with a gradient elution using water-acetonitrile-methanol at 50 degrees C and detected by fluorescence measurement at 318 nm (excitation) and 406 nm (emission). The detection limits (signal-to-noise ratio=3) of the polyamines and N-acetylated polyamines were 0.7-4.5 fmol/injection. The within-day and day-to-day relative standard deviations were 3.2-7.9 and 3.0-7.7%, respectively. Significant differences were found in the urinary excretion of polyamines between cancer patients and normal subjects.
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Affiliation(s)
- Hirofumi Inoue
- Faculty of Pharmacy and Pharmaceutical Sciences, Fukuyama University, Fukuyama, Hiroshima 729-0292, Japan
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Ikehara T, Habu N, Nishino I, Kamimori H. Determination of hydroxyproline in rat urine by high-performance liquid chromatography with electrogenerated chemiluminescence detection using tris(2,2′-bipyridyl) ruthenium(II). Anal Chim Acta 2005. [DOI: 10.1016/j.aca.2004.12.060] [Citation(s) in RCA: 15] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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14
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Delport M, Maas S, van der Merwe SW, Laurens JB. Quantitation of hydroxyproline in bone by gas chromatography-mass spectrometry. J Chromatogr B Analyt Technol Biomed Life Sci 2004; 804:345-51. [PMID: 15081929 DOI: 10.1016/j.jchromb.2004.01.039] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2003] [Revised: 01/20/2004] [Accepted: 01/20/2004] [Indexed: 01/11/2023]
Abstract
A validated gas chromatography (GC)-mass spectrometric (MS) method for the analysis of hydroxyproline in rat femur is reported. Hydroxyproline in bone hydrolysates was extracted with an anion exchange resin and the N(O)-tert-butyldimethylsilyl derivatives analyzed by GC-MS. The hydroxyproline concentration was estimated relative to pipecolic acid, 3,4-dehydroproline and n-tetracosane as internal standards. The mass-to-charge ratios (m/z) for the ions used for quantitation by single ion monitoring were 314 m/z for hydroxyproline, 198 m/z for pipecolic acid, 256 m/z for dehydroproline and 57 m/z for n-tetracosane. A coefficient of variation of 5.8% was achieved and the limit of detection was calculated to be 0.233 micromol/l bone hydrolysate.
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Affiliation(s)
- M Delport
- Department of Chemical Pathology, University of Pretoria, P.O. Box 2034, Pretoria 0001, South Africa
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Kindt E, Gueneva-Boucheva K, Rekhter MD, Humphries J, Hallak H. Determination of hydroxyproline in plasma and tissue using electrospray mass spectrometry. J Pharm Biomed Anal 2004; 33:1081-92. [PMID: 14656599 DOI: 10.1016/s0731-7085(03)00359-5] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
A simple and highly specific method that was developed for the determination of hydroxyproline in biological samples is described. This method could potentially be used for monitoring pathological conditions related to collagen degradation, as well as for screening remedial pharmaceuticals for efficacy. Tissue or plasma samples were prepared by hydrolysis and their hydroxyproline content was determined using spiked calibration curves and LC/MS/MS. Specificity of the method was evaluated using an API Time-Of-Flight (TOF) LC/MS to expose potential interferences. The method proposed here appears to be selective, convenient, precise (<10% R.S.D.), accurate (<10% RE), and sensitive over a linear range of 0.010-10 microg/ml.
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Affiliation(s)
- Erick Kindt
- Department of Pharmacokinetics, Dynamics, and Metabolism, Pfizer Global Research and Development, 2800 Plymouth Road, Ann Arbor, MI 48105, USA
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Inoue H, Sakata Y, Fukunaga K, Nishio H, Tsuruta Y. Sensitive determination of pipecolic acid in serum by high-performance liquid chromatography using 4-(5,6-dimethoxy-2-phthalimidinyl)-2-methoxyphenylsulfonyl chloride as a fluorescent labelling reagent. Anal Chim Acta 2004. [DOI: 10.1016/j.aca.2004.01.050] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
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17
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Inoue H, Fukunaga K, Tsuruta Y. Determination of taurine in plasma by high-performance liquid chromatography using 4-(5,6-dimethoxy-2-phthalimidinyl)-2-methoxyphenylsulfonyl chloride as a fluorescent labeling reagent. Anal Biochem 2003; 319:138-42. [PMID: 12842117 DOI: 10.1016/s0003-2697(03)00277-x] [Citation(s) in RCA: 23] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Abstract
A sensitive high-performance liquid chromatography method for the determination of taurine in human plasma was developed. Taurine and N-methyltaurine (internal standard) were derivatized with 4-(5,6-dimethoxy-2-phthalimidinyl)-2-methoxyphenylsulfonyl chloride to produce fluorescent sulfonamides. The labeling reaction was carried out at 70 degrees C for 20 min at pH 7.5. The fluorescent derivatives were separated on a reversed-phase column by a stepwise elution using (A) acidic phosphate buffer/acetonitrile (83/17) and (B) acetonitrile and detected by fluorescence measurement at excitation and emission wavelengths of 318 and 392 nm, respectively. The detection limit (signal-to-noise ratio=3) of taurine was 3 fmol per injection. The within-day and day-to-day relative standard deviations were 3.0-4.8 and 2.5-4.7%, respectively. The concentration (means) of taurine in normal human plasma was 48.9+/-7.5 microM.
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Affiliation(s)
- Hirofumi Inoue
- Faculty of Pharmacy and Pharmaceutical Sciences, Fukuyama University, Fukuyama, Hiroshima 729-0092, Japan
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Tsuruta Y, Terado I, Inoue H. Determination of free N-acetylneuraminic acid in urine by high-performance liquid chromatography using 3-[(1-[[4-(5,6-dimethoxy-1-oxoisoindolin-2-yl)-2-methoxyphenyl]sulfonyl]pyrrolidin-2-yl)carbonylamino]phenylboronic acid as a fluorescent labeling reagent. J Chromatogr B Analyt Technol Biomed Life Sci 2003; 788:401-5. [PMID: 12705981 DOI: 10.1016/s1570-0232(03)00038-2] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
A highly sensitive high-performance liquid chromatography (HPLC) method for the determination of urinary N-acetylneuraminic acid (NeuAc) using 3-[(1-[[4-(5,6-dimethoxy-1-oxoisoindolin-2-yl)-2-methoxyphenyl]sulfonyl]pyrrolidin-2-yl)carbonylamino]phenylboronic acid as a fluorescent labeling reagent was developed. The labeling reaction was carried out at 30 degrees C for 30 min in the presence of pyridine. The derivative was monitored at Ex 314 nm and Em 388 nm. The detection limit of NeuAc was about 48 fmol per injection. The relative standard deviations of within-day and between-day precisions were 2.6-3.3 and 1.7-3.3%, respectively. Urine diluted 10 times with distilled water was analyzed by employing the standard-addition method. The concentrations were 8-89 nmol/mg creatinine (30+/-28 nmol/mg creatinine, n=9).
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Affiliation(s)
- Yasuto Tsuruta
- Faculty of Pharmacy and Pharmaceutical Sciences, Fukuyama University, Hiroshima 729-0292, Japan.
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Fukushima T, Usui N, Santa T, Imai K. Recent progress in derivatization methods for LC and CE analysis. J Pharm Biomed Anal 2003; 30:1655-87. [PMID: 12485710 DOI: 10.1016/s0731-7085(02)00511-3] [Citation(s) in RCA: 90] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/27/2022]
Abstract
The derivatization procedure with a suitable fluorescence or chemiluminescence reagent is performed for the purpose of increasing the detection sensitivity and selectivity, in high-performance liquid chromatography (HPLC) and/or capillary electrophoresis (CE). In this article, recent derivatization methods and their applications to biosamples are described. In HPLC, femto mol order of mass detection limits are obtained by derivatization. Regarding the fluorescence reagents, the use of water-soluble reagents has been effective to avoid an undesired adsorption in the process of determination of peptides. In CE, the advantages of having extremely low mass detection limits (ranging from atto to yocto mol level) and requiring only a very short analysis time (less than a few minutes) are made possible by using laser-induced fluorescence or near infra-red detections.
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Affiliation(s)
- Takeshi Fukushima
- Laboratory of Bio-Analytical Chemistry, Graduate School of Pharmaceutical Sciences, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
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Inoue H, Iguch H, Kouno A, Tsuruta Y. Fluorometric determination of N-terminal prolyl dipeptides, proline and hydroxyproline in human serum by pre-column high-performance liquid chromatography using 4-(5,6-dimethoxy-2-phthalimidinyl)-2-methoxyphenylsufonyl chloride. JOURNAL OF CHROMATOGRAPHY. B, BIOMEDICAL SCIENCES AND APPLICATIONS 2001; 757:369-73. [PMID: 11417884 DOI: 10.1016/s0378-4347(01)00162-1] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Abstract
A highly sensitive HPLC method for the determination of prolyl dipeptides, Pro and Hyp in serum was developed. After deproteinization of serum and pretreatment with o-phthalaldehyde, the analytes were derivatized with 4-(5,6-dimethoxy-2-phthalimidinyl)-2-methoxyphenylsulfonyl chloride at 70 degrees C for 10 min. The fluorescent derivatives of prolyl dipeptides, Pro and Hyp, were separated on tandem reversed-phase columns by a gradient elution at 55 degrees C and detected by fluorescence measured at 318 nm (excitation) and 392 nm (emission). The detection limits for prolyl dipeptides were 2-5 fmol/injection (S/N=3). Pro-Hyp, Pro-Gly and Pro-Pro were identified as serum prolyl dipeptides. The within-day and between-day relative standard deviations were 1.5-7.9 and 2.4-10.8%, respectively. The recoveries were in the range of 90.8-97.3%. The concentrations of Pro-Hyp, Pro-Gly, Pro-Pro, Pro and Hyp in normal human serum (n = 10) were 0.64+/-0.35, 0.078+/-0.047, 0.022+/-0.016, 177.0+/-43.0 and 11.1+/-3.5 microM, respectively. The concentrations of Pro-Hyp and Pro-Pro in serum of a patient with bone metastases of prostatic cancer were about three times and 50 times, respectively, higher than those in normal human serum.
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Affiliation(s)
- H Inoue
- Faculty of Pharmacy and Pharmaceutical Sciences, Fukuyama University, Hiroshima, Japan
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Tsuruta Y, Kitai S, Watanabe S, Inoue H. 2-Methoxy-4-(2-phthalimidinyl)phenylsulfonyl chloride as a fluorescent labeling reagent for determination of phenols in high-performance liquid chromatography and application for determination of urinary phenol and p-cresol. Anal Biochem 2000; 280:36-41. [PMID: 10805518 DOI: 10.1006/abio.2000.4492] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Highly sensitive fluorescent labeling reagents, 2-(alkyloxy)-4-(2-phthalimidinyl)phenylsulfonyl chlorides (alkyloxy = methoxy, ethoxy, and propoxy; MPS-Cl, EPS-Cl, and PPS-Cl, respectively), for determination of phenols by high-performance liquid chromatography (HPLC) have been developed. These reagents react with phenols in basic medium to produce the corresponding fluorescent sulfonyl esters. The maximum fluorescence wavelengths of the derivatives were 308 nm for excitation and 410 nm for emission. The peaks due to phenol labeled with MPS-Cl, EPS-Cl, and PPS-Cl eluted at 6.3, 8.8, and 12.8 min, respectively, on a reversed-phase column with isocratic elution of methanol/water (2:1, v/v), and the detection limits (signal-to-noise = 3) of the derivatives were 10, 12, and 17 fmol per injection, respectively. Among these reagents, MPS-Cl was advantageous because its derivatives had shorter retention times and higher sensitivities in HPLC. The efficiency of converting phenol to the fluorescent derivative by MPS-Cl was about 100%. When MPS-Cl was applied to the determination of urinary phenol and p-cresol by HPLC using p-ethylphenol as an internal standard, the derivatives were separated at retention times of 6.3, 8.7, and 12.3 min, respectively, under the HPLC conditions described above. The concentrations of phenol and p-cresol in normal human urine were 11.9-293.5 and 8.2-346.1 nmol/mg creatinine, respectively.
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Affiliation(s)
- Y Tsuruta
- Faculty of Pharmacy and Pharmaceutical Sciences, Fukuyama University, Hiroshima, Japan.
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TERADO I, INOUE H, TAO Y, TSURUTA Y. 3-[(1-{[4-(5,6-Dimethoxy-1-oxoisoindolin-2-yl)-2-methoxyphenyl]sulfonyl}-pyrrolidin-2-yl)-carbonylamino]phenylboronic Acid as a Fluorescent Labeling Reagent for Determination of Diol Compounds by HPLC. ANAL SCI 2000. [DOI: 10.2116/analsci.16.881] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- Isao TERADO
- Faculty of Pharmacy and Pharmaceutical Sciences, Fukuyama University
| | - Hirofumi INOUE
- Faculty of Pharmacy and Pharmaceutical Sciences, Fukuyama University
| | - Yoshie TAO
- Faculty of Pharmacy and Pharmaceutical Sciences, Fukuyama University
| | - Yasuto TSURUTA
- Faculty of Pharmacy and Pharmaceutical Sciences, Fukuyama University
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Inoue H, Iguchi H, Kono A, Tsuruta Y. Highly sensitive determination of N-terminal prolyl dipeptides, proline and hydroxyproline in urine by high-performance liquid chromatography using a new fluorescent labelling reagent, 4-(5,6-dimethoxy-2-phthalimidinyl)-2-methoxyphenylsulfonyl chloride. JOURNAL OF CHROMATOGRAPHY. B, BIOMEDICAL SCIENCES AND APPLICATIONS 1999; 724:221-30. [PMID: 10219662 DOI: 10.1016/s0378-4347(99)00009-2] [Citation(s) in RCA: 28] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
A highly sensitive pre-column HPLC method for simultaneous determination of prolyl dipeptides, Pro and Hyp in urine was developed. The analytes were labelled with 4-(5,6-dimethoxy-2-phthalimidinyl)-2-methoxyphenylsulfonyl chloride at 70 degrees C for 20 min. The derivatives separated on tandem reversed-phase columns by a gradient elution and were monitored with fluorescence detection at 318 nm (excitation) and 392 nm (emission). The detection limits for prolyl dipeptides, Pro and Hyp were 1-5 fmol/injection (S/N = 3). Urine samples were treated with o-phthalaldehyde, followed by purification on a Bond Elut C18 column before conducting the labelling reaction. Pro-Hyp, Pro-Gly and Pro-Pro were identified as prolyl dipeptides in urine. The within-day and between-day relative standard deviations were 1.5-4.8 and 1.7-5.8%, respectively. The concentrations of Pro-Hyp, Pro-Gly, Pro-Pro, Pro and Hyp in normal human urine were 97.6 +/- 28.2, 2.74 +/- 1.48, 2.08 +/- 1.13, 6.71 +/- 3.34 and 2.30 +/- 1.59 nmol/mg creatinine, respectively.
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Affiliation(s)
- H Inoue
- Faculty of Pharmacy and Pharmaceutical Sciences, Fukuyama University, Hiroshima, Japan
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