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Chérif I, Gassoumi B, Ayachi H, Echabaane M, Caccamo MT, Magazù S, Said AH, Taoufik B, Ayachi S. A theoretical and electrochemical impedance spectroscopy study of the adsorption and sensing of selected metal ions by 4-morpholino-7-nitrobenzofuran. Heliyon 2024; 10:e26709. [PMID: 38439845 PMCID: PMC10909671 DOI: 10.1016/j.heliyon.2024.e26709] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/07/2023] [Revised: 02/16/2024] [Accepted: 02/19/2024] [Indexed: 03/06/2024] Open
Abstract
The selectivity of a novel chemosensor, based on a modified nitrobenzofurazan referred to as NBD-Morph, has been investigated for the detection of heavy metal cations (Co2+, Pb2+, Mg2+, Ag+, Cu2+, Hg2+, Ni2+, and Zn2+). The ligand, 4-morpholino-7-nitrobenzofurazan (NBD-Morph), was characterized using spectroscopic techniques including FT-IR and 1H NMR. Vibrational frequencies obtained from FT-IR and proton NMR (1H) chemical shifts were accurately predicted employing the density functional theory (DFT) at the B3LYP level of theory. Furthermore, an examination of the structural, electronic, and quantum chemical properties was conducted and discussed. DFT calculations were employed to explore the complex formation ability of the NBD-Morph ligand with Co2+, Pb2+, Mg2+, Ag+, Cu2+, Hg2+, Ni2+, and Zn2+ metal cations. The comparison of adsorption energies for all possible conformations reveals that NBD-Morph exhibits sensitivity and selectivity towards metal ions, including Pb2+, Cu2+, Ag+, and Ni2+. However, an assessment of their reactivity using QTAIM topological parameters demonstrated the ligand's greater complexation ability toward Cu2+ or Ni2+ than those formed by Pb2+ or Ag+. Additionally, molecular electrostatic potential (MEP), Hirshfeld surfaces, and their associated 2D-fingerprint plots were applied to a detailed study of the inter-molecular interactions in NBD-Morph-X (X = Pb2+, Cu2+, Ag+, Ni2+) complexes. The electron localization function (ELF) and the localized-orbital locator (LOL) were generated to investigate the charge transfer and donor-acceptor interactions within the complexes. Electrochemical analysis further corroborates the theoretical findings, supporting the prediction of NBD-Morph's sensory ability towards Ni2+ metal cations. In conclusion, NBD-Morph stands out as a promising sensor for Ni2+.
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Affiliation(s)
- Imen Chérif
- Laboratory of Physico-Chemistry of Materials (LR01ES19), Faculty of Sciences, Avenue of the Environment 5019 Monastir, University of Monastir, Tunisia
- Dipartimento di Scienze Matematiche e Informatiche, Scienze Fisiche e Scienze della Terra, Università di Messina, Viale Ferdinando Stagno D'Alcontres No. 31, S. Agata, 98166, Messina, Italy
| | - Bouzid Gassoumi
- Laboratoire Interfaces et Matériaux Avancés (LIMA), Faculté des Sciences, Université de Monastir, Avenue de l’Environnement, 5019, Monastir, Tunisia
| | - Hajer Ayachi
- Laboratoire de Chimie Hétérocyclique, Produits Naturels et Réactivité (LR11ES39), Faculté des Sciences, Université de Monastir, Avenue de l’Environnement, 5019, Monastir, Tunisia
| | - Mosaab Echabaane
- CRMN, Centre de Recherche en Microélectronique et Nanotechnologie de Sousse, Nanomisene, LR16CRMN01, 4054, Sousse, Tunisie
| | - Maria Teresa Caccamo
- Dipartimento di Scienze Matematiche e Informatiche, Scienze Fisiche e Scienze della Terra, Università di Messina, Viale Ferdinando Stagno D'Alcontres No. 31, S. Agata, 98166, Messina, Italy
| | - Salvatore Magazù
- Dipartimento di Scienze Matematiche e Informatiche, Scienze Fisiche e Scienze della Terra, Università di Messina, Viale Ferdinando Stagno D'Alcontres No. 31, S. Agata, 98166, Messina, Italy
| | - Ayoub Haj Said
- Laboratoire Interfaces et Matériaux Avancés (LIMA), Faculté des Sciences, Université de Monastir, Avenue de l’Environnement, 5019, Monastir, Tunisia
| | - Boubaker Taoufik
- Laboratoire de Chimie Hétérocyclique, Produits Naturels et Réactivité (LR11ES39), Faculté des Sciences, Université de Monastir, Avenue de l’Environnement, 5019, Monastir, Tunisia
| | - Sahbi Ayachi
- Laboratory of Physico-Chemistry of Materials (LR01ES19), Faculty of Sciences, Avenue of the Environment 5019 Monastir, University of Monastir, Tunisia
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Fukushima T, Kansaku A, Umino M, Sakamoto T, Onozato M. Evaluation of D-amino acid oxidase activity in rat kidney using a D-kynurenine derivative, 6-methylthio-D-kynurenine: An in vivo microdialysis study. Drug Discov Ther 2024; 17:434-439. [PMID: 38044118 DOI: 10.5582/ddt.2023.01083] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/05/2023]
Abstract
D-Amino acid oxidase (DAO), a D-amino acid metabolizing enzyme, is reportedly associated with the psychiatric disease schizophrenia, suggesting a role for DAO inhibitors in its treatment. We have previously reported that DAO catalyzes the conversion of nonfluorescent 6-methylthio-D-kynurenine (MeS-D-KYN) to fluorescent 5-methylthiokynurenic acid (MeS-KYNA) in vitro. The present study aimed to determine the potential of MeS-D-KYN in evaluating DAO activity in vivo using renal microdialysis technique in rats. Male Sprague-Dawley rats were subjected to linear microdialysis probe implantation in the left kidney. Continuous perfusion of MeS-D-KYN was maintained, and DAO activity in the kidney cortex was evaluated by measuring the MeS-KYNA content in the microdialysate. The microdialysate was collected every 30 min and analyzed by high-performance liquid chromatography with fluorescence detection, monitored at 450 nm with an excitation wavelength of 364 nm. A significant production of MeS-KYNA was observed during, but not before, infusion of MeS-D-KYN, indicating that this compound is not endogenous. MeS-KYNA production was suppressed by the co-infusion of DAO inhibitor, 5-chlorobenzo[d]isoxazol-3-ol (CBIO), suggesting that MeS-D-KYN was converted to MeS-KYNA by renal DAO. Moreover, oral administration of CBIO effectively suppressed DAO activity in a dose-dependent manner. DAO converted MeS-D-KYN to MeS-KYNA in vivo, suggesting the potential of this compound in evaluating DAO activity. The use of the renal microdialysis technique developed in this study facilitates the monitoring of DAO activity in live experimental animals.
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Affiliation(s)
- Takeshi Fukushima
- Department of Analytical Chemistry, Faculty of Pharmaceutical Sciences, Toho University, Chiba, Japan
| | - Ayano Kansaku
- Department of Analytical Chemistry, Faculty of Pharmaceutical Sciences, Toho University, Chiba, Japan
| | - Maho Umino
- Department of Analytical Chemistry, Faculty of Pharmaceutical Sciences, Toho University, Chiba, Japan
| | - Tatsuya Sakamoto
- Department of Analytical Chemistry, Faculty of Pharmaceutical Sciences, Toho University, Chiba, Japan
| | - Mayu Onozato
- Department of Analytical Chemistry, Faculty of Pharmaceutical Sciences, Toho University, Chiba, Japan
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Chérif I, Raissi H, Abiedh K, Gassoumi B, Caccamo MT, Magazu S, Said AH, Hassen F, Boubaker T, Ayachi S. Exploration of intramolecular charge transfer in para-substituted nitrobenzofurazan: Experimental and theoretical analyses. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2023; 301:122939. [PMID: 37285745 DOI: 10.1016/j.saa.2023.122939] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/04/2023] [Revised: 05/25/2023] [Accepted: 05/27/2023] [Indexed: 06/09/2023]
Abstract
The present work aims at exploring the high electrophilic character of 4-chloro-7-nitrobenzo-2-oxa-1,3-diazole (NBD-Cl) toward the morpholine group by an SNAr reaction in acetonitrile or water (thereafter referred to as NBD-Morph). The electron-donating ability of the morpholine causes intra-molecular charge transfer (ICT). In this report, we present a comprehensive study on the optical characteristics using UV-Vis, photoluminescence (cw-PL) and its time-resolved (TR-PL) to determine the properties of the emissive intramolecular charge transfer (ICT) in the NBD-Morph donor-acceptor system. An exhaustive theoretical investigation utilizing the density functional theory (DFT) and its extension TD-DFT methods is an essential complement of experiments to rationalize and understand the molecular structure and related properties. The findings from QTAIM, ELF, and RDG analyses establish that the bonding between morpholine and NBD moieties is of the electrostatic or hydrogen bond type. In addition, the Hirshfeld surfaces have been established to explore the types of interactions. Further, the non-linear optical (NLO) responses of the compound have been examined. The structure-property relationships obtained through the combined experimental and theoretical offer valuable insights for designing efficient NLO material.
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Affiliation(s)
- Imen Chérif
- Laboratory of Physico-Chemistry of Materials (LR01ES19), Faculty of Sciences, University of Monastir, Avenue of the environment, 5019 Monastir, Tunisia
| | - Hanen Raissi
- Laboratoire de Chimie Hétérocyclique, Produits Naturels et Réactivité (LR11ES39), Faculté des Sciences, Université de Monastir, Avenue de l'Environnement, 5019 Monastir, Tunisia
| | - Khouloud Abiedh
- Laboratoire de Micro-Optoélectronique et Nanostructures (LR99/ES29), Faculté des Sciences, Université de Monastir, Monastir, Tunisia
| | - Bouzid Gassoumi
- Laboratoire Interfaces et Matériaux Avancés (LIMA), Faculté des Sciences, Université de Monastir, Avenue de l'Environnement, 5019 Monastir, Tunisia
| | - Maria Teresa Caccamo
- Dipartimento di Scienze Matematiche e Informatiche, Scienze Fisiche e Scienze della Terra Università di Messina Viale Ferdinando Stagno D', Alcontres n°31, S. Agata, 98166 Messina Italy
| | - Salvatore Magazu
- Dipartimento di Scienze Matematiche e Informatiche, Scienze Fisiche e Scienze della Terra Università di Messina Viale Ferdinando Stagno D', Alcontres n°31, S. Agata, 98166 Messina Italy
| | - Ayoub Haj Said
- Laboratoire Interfaces et Matériaux Avancés (LIMA), Faculté des Sciences, Université de Monastir, Avenue de l'Environnement, 5019 Monastir, Tunisia; Centre de Recherche en Microélectronique et Nanotechnologie, Technopôle de Sousse, BP 334, Sahloul, 4054 Sousse, Tunisia
| | - Fredj Hassen
- Laboratoire de Micro-Optoélectronique et Nanostructures (LR99/ES29), Faculté des Sciences, Université de Monastir, Monastir, Tunisia
| | - Taoufik Boubaker
- Laboratoire de Chimie Hétérocyclique, Produits Naturels et Réactivité (LR11ES39), Faculté des Sciences, Université de Monastir, Avenue de l'Environnement, 5019 Monastir, Tunisia
| | - Sahbi Ayachi
- Laboratory of Physico-Chemistry of Materials (LR01ES19), Faculty of Sciences, University of Monastir, Avenue of the environment, 5019 Monastir, Tunisia.
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Structure–property relationships in para-substituted nitrobenzofurazans: electrochemical, optical, and theoretical analysis. CHEMICAL PAPERS 2022. [DOI: 10.1007/s11696-022-02150-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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Russ M, Hauser S, Wintersteiger R, Greilberger J, Andrä M, Ortner A. Determination of Angiotensin-(1-7) with HPLC/Fluorescence-Detection. J Fluoresc 2015; 26:81-6. [PMID: 26452351 DOI: 10.1007/s10895-015-1686-y] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/07/2015] [Accepted: 09/28/2015] [Indexed: 12/01/2022]
Abstract
Angiotensin-(1-7) is an important active component in the renin-angiotensin-system. Due to its cardio protective effects it is now under investigation in combination with antioxidants as a reperfusion solution. The combination showed impressive effects on isolated hearts of male Wistar rats after induced ischemia. In this work a high performance liquid chromatography method with fluorescence detection was developed for the first time for in-process measurements as well as for stability tests of the peptide in the novel antioxidant-containing Karal® solution. For fluorescence detection of angiotensin-(1-7) fluorescamine as derivatization dye was applied. Under optimized conditions the method showed linearity over the range of 50 to 5000 ng/mL with R(2) of 0.9988 and an overall precision better than 5.0 %. LOD and LOQ were determined to be in the femtomol range on column. It was found that stability of angiotensin-(1-7) could be significantly improved in the antioxidant containing preparation compared to aqueous solutions.
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Affiliation(s)
- Miriam Russ
- Institute of Pharmaceutical Sciences, Department of Pharmaceutical Chemistry, University of Graz, Schubertstraße 1, 8010, Graz, Austria
| | - Susanne Hauser
- Institute of Pharmaceutical Sciences, Department of Pharmaceutical Chemistry, University of Graz, Schubertstraße 1, 8010, Graz, Austria
| | - Reinhold Wintersteiger
- Institute of Pharmaceutical Sciences, Department of Pharmaceutical Chemistry, University of Graz, Schubertstraße 1, 8010, Graz, Austria
| | - Joachim Greilberger
- Institute of Physiological Chemistry, Medical University Graz, Harrachgasse 21, 8010, Graz, Austria
| | - Michaela Andrä
- Division of Transplantation Surgery, Medical University Graz, Auenbruggerplatz 29, 8036, Graz, Austria
| | - Astrid Ortner
- Institute of Pharmaceutical Sciences, Department of Pharmaceutical Chemistry, University of Graz, Schubertstraße 1, 8010, Graz, Austria.
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Zhao Y, Li SH, Chu J, Chen YP, Li WW, Yu HQ, Liu G, Tian YC, Xiong Y. A nano-sized Au electrode fabricated using lithographic technology for electrochemical detection of dopamine. Biosens Bioelectron 2012; 35:115-122. [PMID: 22410488 DOI: 10.1016/j.bios.2012.02.030] [Citation(s) in RCA: 24] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/12/2011] [Revised: 02/08/2012] [Accepted: 02/15/2012] [Indexed: 11/25/2022]
Abstract
One big challenge of fabricating nanosensors for spatially resolved electrochemical detection of neurochemicals, such as dopamine (DA), is the difficulty to assembly nanometer-scale patternable and integrated sensors. In this work we develop a novel approach to precisely manufacture nano-Au-electrode (NAE) using lithographic fabrication technique, and characterize the NAE for DA detection. A negative photoresist, SU-8, is used as a substrate and protection layer for the 127-nm Au active sensing layer. The cross surface morphology and thickness of the Au layer are imaged by scanning electron microscopy and an interference microscopy. This NAE could be precisely controlled, repeatedly fabricated and conveniently renewed for several times. The electrochemical sensitivity and selectivity of the NAE towards DA detection are significantly higher than those of a standard Au thin-film electrode. This work demonstrates that the NAE could be used as an attractive means for electrochemically sensing and recording DA.
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Affiliation(s)
- Yue Zhao
- Department of Chemistry, University of Science & Technology of China, Hefei 230026, China
| | - Shu-Hong Li
- Department of Chemistry, University of Science & Technology of China, Hefei 230026, China
| | - Jian Chu
- Department of Chemistry, University of Science & Technology of China, Hefei 230026, China
| | - You-Peng Chen
- Department of Chemistry, University of Science & Technology of China, Hefei 230026, China
| | - Wen-Wei Li
- Department of Chemistry, University of Science & Technology of China, Hefei 230026, China
| | - Han-Qing Yu
- Department of Chemistry, University of Science & Technology of China, Hefei 230026, China.
| | - Gang Liu
- National Synchrotron Radiation Laboratory, University of Science & Technology of China, Hefei 230026, China
| | - Yang-Chao Tian
- National Synchrotron Radiation Laboratory, University of Science & Technology of China, Hefei 230026, China
| | - Ying Xiong
- National Synchrotron Radiation Laboratory, University of Science & Technology of China, Hefei 230026, China
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Xu H, Guy Y, Hamsher A, Shi G, Sandberg M, Weber SG. Electroosmotic sampling. Application to determination of ectopeptidase activity in organotypic hippocampal slice cultures. Anal Chem 2010; 82:6377-83. [PMID: 20669992 PMCID: PMC2920223 DOI: 10.1021/ac1012706] [Citation(s) in RCA: 17] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/06/2023]
Abstract
We hypothesize that peptide-containing solutions pulled through tissue should reveal the presence and activity of peptidases in the tissue. Using the natural zeta-potential in the organotypic hippocampal slice culture (OHSC), physiological fluids can be pulled through the tissue with an electric field. The hydrolysis of the peptides present in the fluid drawn through the tissue can be determined using capillary HPLC with electrochemical detection of the biuret complexes of the peptides following a postcolumn reaction. We have characterized this new sampling method by measuring the flow rate, examining the use of internal standards, and examining cell death caused by sampling. The sampling flow rate ranges from 60 to 150 nL/min with a 150 microm (ID) sampling capillary with an electric field (at the tip of the capillary) from 30 to 60 V/cm. Cell death can be negligible with controlled sampling conditions. Using this sampling approach, we have electroosmotically pulled Leu-enkephalin through OHSCs to identify ectopeptidase activity in the CA3 region. These studies show that a bestatin-sensitive aminopeptidase may be critical for the hydrolysis of exogenous Leu-enkephalin, a neuropeptide present in the CA3 region of OHSCs.
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Affiliation(s)
- Hongjuan Xu
- Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Pittsburgh, Pennsylvania 15260
| | - Yifat Guy
- Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Pittsburgh, Pennsylvania 15260
| | - Amy Hamsher
- Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Pittsburgh, Pennsylvania 15260
| | - Guoyue Shi
- Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Pittsburgh, Pennsylvania 15260
| | - Mats Sandberg
- Institute of Biomedicine, Gothenburg University, Gothenburg, Sweden
| | - Stephen G. Weber
- Department of Chemistry, University of Pittsburgh, 219 Parkman Avenue, Pittsburgh, Pennsylvania 15260
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Determination of vancomycin in human plasma using high-performance liquid chromatography with fluorescence detection. Anal Bioanal Chem 2009; 395:527-32. [PMID: 19655128 DOI: 10.1007/s00216-009-2948-9] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/30/2009] [Revised: 06/13/2009] [Accepted: 07/01/2009] [Indexed: 10/20/2022]
Abstract
A high-performance liquid chromatographic (HPLC) method with fluorescence detection for the quantification of vancomycin in human plasma was developed and validated. The method includes an extraction of vancomycin by deproteinization with acetonitrile. The analyses were carried out at 258 nm as the emission wavelength while exciting at 225 nm on a reversed-phase column (30 cm x 4 mm i.d. x 10 microm Waters Associates microBondapak C18) using a mobile phase composed of methanol and phosphate buffer at pH 6.3. Vancomycin was quantitatively recovered from human plasma samples (>96%) with high values of precision. The separation was completed within 27 min. The calibration curve was linear over the range from 5 to 1,000 ng/mL with the detection and quantification limits of 2 ng/mL and 5 ng/mL, respectively. This method is suitable for the routine assay of plasma samples.
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Sun L, Stenken JA, Brunner JE, Michel KB, Adelsberger JK, Yang AY, Zhao JJ, Musson DG. An in vivo microdialysis coupled with liquid chromatography/tandem mass spectrometry study of cortisol metabolism in monkey adipose tissue. Anal Biochem 2008; 381:214-23. [DOI: 10.1016/j.ab.2008.06.036] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2008] [Revised: 06/16/2008] [Accepted: 06/24/2008] [Indexed: 11/26/2022]
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Santa T, Fukushima T, Ichibangase T, Imai K. Recent progress in the development of derivatization reagents having a benzofurazan structure. Biomed Chromatogr 2008; 22:343-53. [DOI: 10.1002/bmc.945] [Citation(s) in RCA: 21] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/07/2022]
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Steuerwald AJ, Villeneuve JD, Sun L, Stenken JA. In vitro characterization of an in situ microdialysis sampling assay for elastase activity detection. J Pharm Biomed Anal 2006; 40:1041-7. [PMID: 16242888 DOI: 10.1016/j.jpba.2005.05.036] [Citation(s) in RCA: 14] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2005] [Revised: 05/06/2005] [Accepted: 05/10/2005] [Indexed: 11/16/2022]
Abstract
A microdialysis sampling method has been developed to detect the in vitro presence of a proteolytic enzyme, porcine elastase, external to a microdialysis probe. Elastase converts the substrate, succinyl(Ala)(3)-p-nitroanilide (suc(Ala)(3)-p-NA), to p-nitroaniline (p-NA). The substrate, suc(Ala)(3)-p-NA, was locally delivered through the microdialysis probe to external solutions containing different elastase activities (0.025-0.5 units/mL). The product, p-NA, was recovered back into the probe. Dialysates containing both suc(Ala)(3)-p-NA and p-NA were quantified using HPLC-UV. Different microdialysis suc(Ala)(3)-p-NA extraction efficiencies (EE) were observed among different elastase-containing solutions (buffer and 0.3% agar solutions). The p-NA concentrations recovered back into the microdialysis probe correlated with the elastase activity external to the microdialysis probe. The greatest fraction of p-NA recovered as compared to substrate lost occurred with the highest flow rate used (5.0 microL/min). However, the highest concentrations of p-NA recovered occurred at the lowest flow rates. This method may allow for microdialysis sampling to be used as a means to study localized enzyme activity.
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Affiliation(s)
- Amy J Steuerwald
- Department of Chemistry and Chemical Biology, Cogswell Laboratories, Rensselaer Polytechnic Institute, Troy, NY 12180-3590, USA
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Imai K. Analytical Chemical Studies on High-Performance Recognition and Detection of Bio-molecules in Life. YAKUGAKU ZASSHI 2003; 123:901-17. [PMID: 14631753 DOI: 10.1248/yakushi.123.901] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
In order to understand the mechanism for maintaining life of animals based on the search of dynamics of biomolecules, I have developed several sensitive and selective methods for their quantification. Using the methods of derivatization with the developed benzofurazan fluorogenic reagents (4-fluoro-7-nitro-2,1,3-benzoxadiazole (NBD-F), ammonium 7-fluoro-2,1,3-benzoxadiazole 4-sulfonate (SBD-F) and etc.) followed by high-performance liquid chromatography (HPLC)--fluorescence detection, a certain kind of biological and clinical importance was demonstrated of chiral bio-molecules (D-amino acids, D-lactic acid and so on), peptides and proteins. The proposed method (derivatization with SBD-F, isolation of the fluorescent proteins by two-dimensional HPLC, enzymatic digestion and identification of the altered proteins by HPLC-mass spectrometry (MS)/MS with database-searching algorithm) for proteomics studies revealed the changed proteins in the islets of Langerhans of the dexamethazone-induced diabetic rats. An importance of catecholamine metabolism on the blood pressure regulation was also suggested by the method of HPLC-chemiluminescence detection of catecholamines and their 3-O-methylmetabolites. A new field of Analytical Chemistry, i.e., Bio-Analytical Chemistry, was also proposed.
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Affiliation(s)
- Kazuhiro Imai
- Center for Research and Development, Kyoritsu College of Pharmacy, 1-5-30 Shibakoen, Minato-ku, Tokyo 105-8512, Japan.
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