Zobrazeno 1 - 10
of 72
pro vyhledávání: '"Akinobu Matsunaga"'
Publikováno v:
Journal of AOAC INTERNATIONAL. 87:1356-1367
A method is described for the rapid determination of pesticide residues in agricultural products. Pesticides were extracted from samples with acetonitrile. To remove pigments and fatty acids, an aliquot of the extract was cleaned up by a minicolumn t
Autor:
Hiroyuki Nakazawa, Akinobu Matsunaga, Yoshihiro Yoshimura, Rie Ito, Kayoko Kato, Shuji Kodama, Atsushi Yamamoto
Publikováno v:
Food Chemistry. 83:563-568
The enantiomeric composition of catechin in commercial tea beverages differs markedly from that in freshly brewed tea. We attempt to determine the cause of this difference by measuring the change in the ratios of catechins relative to (+)-catechin wi
Publikováno v:
ELECTROPHORESIS. 24:2711-2715
Chiral resolution of native DL-tartaric acid was achieved by ion-pair capillary electrophoresis (CE) using an aqueous-ethanol background electrolyte with (1R,2R)-(-)-1,2-diaminocyclohexane (R-DACH) as a chiral counterion. Factors affecting chiral res
Autor:
Akinobu Matsunaga, Atsushi Yamamoto, Kazumasa Okamura, Kazuichi Hayakawa, Ryoichi Kizu, Shuji Kodama
Publikováno v:
Journal of Separation Science. 25:1055-1062
Cyclodextrin-modified micellar electrokinetic chromatography was applied to the enantioseparation of thiobencarb sulfoxide, which is produced by S-oxygenation of thiobencarb, a herbicide, using γ-cyclodextrin together with sodium dodecyl sulfate. Fa
Publikováno v:
Enantiomer: A Journal of Sterochemistry. 7:225-229
A novel device is described that permits fluorescence-detected circular dichroism (FDCD) detection in a conventional fluorescence spectrophotometer. FDCD is a phenomenon in which the emission intensity of a chiral analyte depends on the polarization
Autor:
Kazuichi Hayakawa, Ryoichi Kizu, Yukio Saitoh, Atsushi Yamamoto, Akinobu Matsunaga, Kazumasa Okamura, Shuji Kodama
Publikováno v:
Journal of Agricultural and Food Chemistry. 50:1312-1317
Cyclodextrin-modified micellar electrokinetic chromatography was applied to the enantioseparation of vinclozolin, which has been used as a fungicide and has an anti-androgenic activity, using gamma-cyclodextrin together with sodium dodecyl sulfate. F
Autor:
Kazuichi Hayakawa, Shuji Kodama, Akinobu Matsunaga, Kazuya Nakagomi, Atsushi Yamamoto, Keizou Matsui
Publikováno v:
Journal of Agricultural and Food Chemistry. 50:767-770
The amounts of D- and L-lactic acids during the brewing process of sake were determined by capillary electrophoresis using 2-hydroxypropyl-beta-cyclodextrin as a chiral selector. Because L-lactic acid, which prevents the growth of nonuseful microorga
Autor:
Hiroyuki Nakazawa, Atsushi Yamamoto, Shuji Kodama, Nami Akiba, Akinobu Matsunaga, Kayoko Kato
Publikováno v:
Journal of Chromatography A. 928:139-144
A multi-beam circular dichroism (CD) detector which is easily constructed by inserting inexpensive optics into a conventional photo-diode array detector has an advantage of simultaneous detection of the absorbance and CD. The enantiomeric purity dete
Publikováno v:
Journal of Chromatography A. 881:639-644
An ion chromatographic method with gradient elution using an automated eluent generator was developed for the simultaneous determination of condensed phosphates (CPs) such as orthophosphate (P1), pyrophosphate (P2), polyphosphate, trimetaphosphate an
Publikováno v:
Journal of Chromatography A. 875:371-377
Chiral resolution of native DL-lactic acid was performed by capillary electrophoresis using 2-hydroxypropyl-beta-cyclodextrin as a chiral selector. Various factors affecting chiral resolution, migration time, and peak area of lactic acid were studied