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Higashi Y, Fujii Y. HPLC-UV ANALYSIS OF EUGENOL IN CLOVE AND CINNAMON OILS AFTER PRE-COLUMN DERIVATIZATION WITH 4-FLUORO-7-NITRO-2,1,3-BENZOXADIAZOLE. J LIQ CHROMATOGR R T 2011. [DOI: 10.1080/10826076.2011.534689] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
Affiliation(s)
- Yasuhiko Higashi
- a Faculty of Pharmaceutical Sciences, Department of Analytical Chemistry , Hokuriku University , Kanazawa, Japan
| | - Youichi Fujii
- a Faculty of Pharmaceutical Sciences, Department of Analytical Chemistry , Hokuriku University , Kanazawa, Japan
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Higashi Y, Fujii Y. HPLC-UV Analysis of Phenol and Chlorophenols in Water After Precolumn Derivatization with 4-Fluoro-7-nitro-2,1,3-benzoxadiazole. J LIQ CHROMATOGR R T 2009. [DOI: 10.1080/10826070903188013] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Yasuhiko Higashi
- a Department of Analytical Chemistry , Faculty of Pharmaceutical Sciences, Hokuriku University , Kanazawa, Japan
| | - Youichi Fujii
- a Department of Analytical Chemistry , Faculty of Pharmaceutical Sciences, Hokuriku University , Kanazawa, Japan
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Multicomponent analyses of chiral samples by use of regression analysis of UV-visible spectra of cyclodextrin guest-host complexes. Anal Bioanal Chem 2009; 394:1645-53. [PMID: 19484461 DOI: 10.1007/s00216-009-2853-2] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/19/2009] [Revised: 05/08/2009] [Accepted: 05/13/2009] [Indexed: 10/20/2022]
Abstract
We report the first combined use of analytical spectroscopy, guest-host chemistry, and multivariate regression analysis for determination of enantiometric composition of multicomponent samples of chiral analytes. Sample solutions containing multicomponent analytes of ephedrine, tryptophan, propranolol, and proline of varying enantiomeric composition with beta-cyclodextrin (BCD) or methyl-beta-cyclodextrin (Me-BCD) as chiral host molecules were investigated using ultraviolet (UV)-visible spectroscopy. The interactions of enantiomers of chiral analytes with chiral hosts resulted in the formation of transient diastereomeric inclusion complexes with varying spectral properties. Multivariate analysis using partial-least-square (PLS) regression was used to correlate subtle changes in the UV-visible spectra of the guest-host complexes with the enantiomeric composition of the calibration samples. These PLS regressions were carefully optimized and then used to predict the enantiomeric composition of multicomponent chiral analytes of validation samples. The results of these validation studies demonstrate the predictive ability of the regression models for determination of future enantiomeric composition of samples. The accuracy of the models to correctly predict the enantiomeric composition of samples, evaluated by use of the root mean square percent relative error (RMS%RE) was analyte and chiral host dependent. In general, better prediction of enantiomeric composition of samples and low RMS%RE values were obtained when Me-BCD was used as the chiral host. The analyses procedure reported here is simple, rapid, and inexpensive. In addition, this approach does not require prior separation of chiral analytes, thus reducing analysis time and eliminating the need for expensive chiral columns.
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NAKASHIMA K, IKEDA R, WADA M. Analytical Studies on the Development of High-Performance Liquid Chromatographic Methods with Fluorescence or Chemiluminescence Detections and Their Practical Applications. ANAL SCI 2009; 25:21-31. [DOI: 10.2116/analsci.25.21] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
Affiliation(s)
- Kenichiro NAKASHIMA
- Department of Clinical Pharmacy, Graduate School of Biomedical Sciences, Nagasaki University
| | - Rie IKEDA
- Department of Clinical Pharmacy, Graduate School of Biomedical Sciences, Nagasaki University
| | - Mitsuhiro WADA
- Department of Clinical Pharmacy, Graduate School of Biomedical Sciences, Nagasaki University
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RICHARD GERALDI, MARWANI HADIM, JIANG SHAN, FAKAYODE SAYOO, LOWRY MARK, STRONGIN ROBERTM, WARNER ISIAHM. Chiral recognition of amino acids by use of a fluorescent resorcinarene. APPLIED SPECTROSCOPY 2008; 62:476-80. [PMID: 18498687 PMCID: PMC2662756 DOI: 10.1366/000370208784344514] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/26/2023]
Abstract
The spectroscopic properties of a chiral boronic acid based resorcinarene macrocycle employed for chiral analysis were investigated. Specifically, the emission and excitation characteristics of tetraarylboronate resorcinarene macrocycle (TBRM) and its quantum yield were evaluated. The chiral selector TBRM was investigated as a chiral reagent for the enantiomeric discrimination of amino acids using steady-state fluorescence spectroscopy. Chiral recognition of amino acids in the presence of the macrocycle was based on diastereomeric complexes. Results demonstrated that TBRM had better chiral discrimination ability for lysine as compared to the other amino acids. Partial least squares regression modeling (PLS-1) of spectral data for macrocycle-lysine guest-host complexes was used to correlate the changes in the fluorescence emission for a set of calibration samples consisting of TBRM in the presence of varying enantiomeric compositions of lysine. In addition, validation studies were performed using an independently prepared set of samples with different enantiomeric compositions of lysine. The results of multivariate regression modeling indicated good prediction ability of lysine, which was confirmed by a root mean square percent relative error (RMS%RE) of 5.8%.
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Affiliation(s)
- GERALD I. RICHARD
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803 (G.I.R., H.M.M., S.J., M.L., I.M.W.); Department of Chemistry, King Abdulaziz University, Jeddah, Saudi Arabia 21589 (H.M.M.); Department of Chemistry, Winston-Salem State University, Winston-Salem, North Carolina 27110 (S.O.F.); and Department of Chemistry, Portland State University, Portland, Oregon 97207 (R.M.S.)
| | - HADI M. MARWANI
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803 (G.I.R., H.M.M., S.J., M.L., I.M.W.); Department of Chemistry, King Abdulaziz University, Jeddah, Saudi Arabia 21589 (H.M.M.); Department of Chemistry, Winston-Salem State University, Winston-Salem, North Carolina 27110 (S.O.F.); and Department of Chemistry, Portland State University, Portland, Oregon 97207 (R.M.S.)
| | - SHAN JIANG
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803 (G.I.R., H.M.M., S.J., M.L., I.M.W.); Department of Chemistry, King Abdulaziz University, Jeddah, Saudi Arabia 21589 (H.M.M.); Department of Chemistry, Winston-Salem State University, Winston-Salem, North Carolina 27110 (S.O.F.); and Department of Chemistry, Portland State University, Portland, Oregon 97207 (R.M.S.)
| | - SAYO O. FAKAYODE
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803 (G.I.R., H.M.M., S.J., M.L., I.M.W.); Department of Chemistry, King Abdulaziz University, Jeddah, Saudi Arabia 21589 (H.M.M.); Department of Chemistry, Winston-Salem State University, Winston-Salem, North Carolina 27110 (S.O.F.); and Department of Chemistry, Portland State University, Portland, Oregon 97207 (R.M.S.)
| | - MARK LOWRY
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803 (G.I.R., H.M.M., S.J., M.L., I.M.W.); Department of Chemistry, King Abdulaziz University, Jeddah, Saudi Arabia 21589 (H.M.M.); Department of Chemistry, Winston-Salem State University, Winston-Salem, North Carolina 27110 (S.O.F.); and Department of Chemistry, Portland State University, Portland, Oregon 97207 (R.M.S.)
| | - ROBERT M. STRONGIN
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803 (G.I.R., H.M.M., S.J., M.L., I.M.W.); Department of Chemistry, King Abdulaziz University, Jeddah, Saudi Arabia 21589 (H.M.M.); Department of Chemistry, Winston-Salem State University, Winston-Salem, North Carolina 27110 (S.O.F.); and Department of Chemistry, Portland State University, Portland, Oregon 97207 (R.M.S.)
| | - ISIAH M. WARNER
- Department of Chemistry, Louisiana State University, Baton Rouge, Louisiana 70803 (G.I.R., H.M.M., S.J., M.L., I.M.W.); Department of Chemistry, King Abdulaziz University, Jeddah, Saudi Arabia 21589 (H.M.M.); Department of Chemistry, Winston-Salem State University, Winston-Salem, North Carolina 27110 (S.O.F.); and Department of Chemistry, Portland State University, Portland, Oregon 97207 (R.M.S.)
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Higashi Y, Nakamura S, Matsumura H, Fujii Y. Simultaneous liquid chromatographic assay of amantadine and its four related compounds in phosphate-buffered saline using 4-fluoro-7-nitro-2,1,3-benzoxadiazole as a fluorescent derivatization reagent. Biomed Chromatogr 2006; 20:423-8. [PMID: 16161183 DOI: 10.1002/bmc.577] [Citation(s) in RCA: 34] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/09/2022]
Abstract
Simultaneous HPLC assay of 1-adamantanamine hydrochloride (amantadine) and its four related compounds [2-adamantanamine hydrochloride (2-ADA), 1-adamantanmethylamine (ADAMA), 1-(1-adamantyl)ethylamine hydrochloride (rimantadine) and 3,5-dimethyl-1-adamantanamine hydrochloride (memantine)] in phosphate-buffered saline (pH 7.4) after pre-column derivatization with 4-fluoro-7-nitro-2,1,3-benzoxadiazole (NBD-F) was developed. Phosphate-buffered saline samples were mixed with borate buffer and NBD-F solution in acetonitrile at 60 degrees C for 5 min and injected into HPLC. Five derivatives were well separated from each other. The lower limits of detection of amantadine, 2-ADA, ADAMA, rimantadine and memantine were 0.008, 0.001, 0.0008, 0.0015 and 0.01 microg/mL, respectively. The coefficients of variation for intra- and inter-day assay were less than 6.4 and 8.2%, respectively. The method presented was applied to a binding study of these compounds to human alpha(1)-acid glycoprotein. While affinity constants and capacities for ADAMA, rimantadine and memantine were calculated by means of Scatchard plots, those for the others were not determined. ADAMA, rimantadine and memantine were bound with different affinities and capacities. These results indicate that NBD-F is a good candidate as a fluorescent reagent to simultaneously determine amantadine and its four related compounds by HPLC after pre-column derivatization. Our method can be applied to binding studies for protein.
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Affiliation(s)
- Yasuhiko Higashi
- Department of Analytical Chemistry, Faculty of Pharmaceutical Sciences, Hokuriku University, Ho-3, Kanagawa-machi, Kanazawa 920-1181, Japan.
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Higashi Y, Matsumura H, Fujii Y. Determination of fluvoxamine in rat plasma by HPLC with pre-column derivatization and fluorescence detection using 4-fluoro-7-nitro-2,1,3-benzoxadiazole. Biomed Chromatogr 2005; 19:771-6. [PMID: 15856488 DOI: 10.1002/bmc.514] [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] [Indexed: 11/08/2022]
Abstract
A sensitive, simple and reliable method using high-performance liquid chromatographic (HPLC) assay of fluvoxamine (FLU), a selective serotonin reuptake inhibitor (SSRI), in rat plasma after pre-column derivatization with 4-fluoro-7-nitro-2,1,3-benzoxadiazole (NBD-F) was developed in this study. Extracted plasma samples were mixed with NBD-F at 60 degrees C for 5 min and injected into HPLC. Retention times of FLU and an internal standard (propafenone) derivative were 15.5 and 13.5 min, respectively. The calibration curve was linear over the range 0.015-1.5 microg/mL (r2 = 0.9985) and the lower limits of detection and quantification of FLU were 0.008 and 0.015 microg/mL, respectively, in 100 microL of plasma. The derivative sample was stable at 4 degrees C for 1 day. The coefficients of variation for intra-day and inter-day assay of FLU were less than 8.3 and 9.6%, respectively. Other SSRIs and centrally acting drugs did not interfere with the peak of the FLU derivative. The method was applied for analysis of the plasma samples from rats treated with FLU. These results indicate that the method presented is useful to determine the FLU levels in rat plasma of volumes as small as 100 microL and can be applied to pharmacokinetic studies.
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Affiliation(s)
- Yasuhiko Higashi
- Department of Analytical Chemistry, Faculty of Pharmaceutical Sciences, Hokuriku University, Ho-3, Kanagawa-machi, Kanazawa 920-1181, Japan.
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