著者

波多野 力 枝松 礼 平松 緑 森 昭胤 藤田 勇三郎 安原 多恵子 吉田 隆志 奥田 拓男

出版者

公益社団法人日本薬学会

雑誌

Chemical & pharmaceutical bulletin (ISSN:00092363)

巻号頁・発行日

vol.37, no.8, pp.2016-2021, 1989-08-25

被引用文献数

14 532

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The scavenging effects of twenty-five tannins including low-molecular polyphenols on the superoxide anion radical (O_2^-) generated in the hypoxanthine-xanthine oxidase system were estimated by electron spin resonance (ESR) measurements of the adducts formed by 5,5-dimethyl-1-pyrroline-N-oxide (DMPO) and the radical. The scavenging effects of tannins and related polyphenols having ortho-trihydroxyl (pyrogallol) structure [galloyl, hexahydroxydiphenoyl (HHDP) groups in hydrolyzable tannins, galloyl group in acylated proanthocyanidins, and the B-ring of some flavan-3-ols] were stronger than the effects of unacylated proanthocyanidins. The effects of tannins and related polyphenols on the superoxide anion radical were also compared with those on the 1,1-diphenyl-2-picrylhydrazyl (DPPH) radical. Each tannin in an ethanol solution of DPPH radical reduced the intensity of the signal of the DPPH radical, and gave a weak signal assignable to a radical derived from that tannin, in a similar way to the appearance of the signal of dl-α-tocopherol radical, accompanied with reduction of the signal of DPPH radical, in a mixture of dl-α-tocopherol and the DPPH radical. In contrast to the case of the superoxide anion radical, the effects of unacylated proanthocyanidins on DPPH radical were comparable with those of the other types of tannins. The scavenging effects of all of the tannins and related polyphenols tested in the experiments on DPPH radical were stronger than that of dl-α-tocopherol.

著者

檀上 和美 神谷 明良 池田 栄司 鳥居 佐紀子 砂田 久一 大塚 昭信

出版者

公益社団法人日本薬学会

雑誌

Chemical & pharmaceutical bulletin (ISSN:00092363)

巻号頁・発行日

vol.40, no.9, pp.2505-2509, 1992-09-25

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In the present study, a water/isopropyl alcohol system was selected as the solvent in a hydroxypropylcellulose (HPC) binder solution for the preparation of lactose granules.With a fluidized bed granulation method, the mean granule diameter increased as the adhesion tension (γcosθ) and lactose solubility increased. With an agitating granulation method, the mean granule diameter was independent of the adhesion tension and lactose solubility, but it increased as the viscosity of the binder solution increased.With both granulating methods, greanule hardness increased as the adhesion tension and lactose solubility increased, while the pore volume of the granules decreased as the adhesion tension and lactose solubility increased.The quantitative relationship between the physical properties of the granules and several properties of the solvent solution was investigated by the application of multiple regression analysis.