- 著者
- 川口 健夫 鈴木 嘉樹 南部 直樹 永井 恒司
- 出版者
- The Pharmaceutical Society of Japan
- 雑誌
- Chemical and Pharmaceutical Bulletin (ISSN:00092363)
- 巻号頁・発行日
- vol.33, no.7, pp.2956-2961, 1985-07-25 (Released:2008-03-31)
- 参考文献数
- 13
- 被引用文献数
- 6 8
Five acidic 3', 5'-diesters of 5-fluoro-2'-deoxyuridine (FUdR) including 3-carboxypropionate, 4-carboxybutyrate, 5-carboxypentanoate, 6-carboxyhexanoate and 7-carboxyheptanoate were synthesized, and their susceptibility to porcine liver, rat liver homogenate, rat intestinal homogenate and rat plasma esterase preparations was studied. The susceptibility of the derivatives to porcine liver esterase preparation increased as the number of methylene groups in the ester promoiety increased in both acidic (pH 5.0) and neutral (pH 7.0) solutions. The derivatives showed about 100 times higher reactivity to the esterase at pH 5.0 than at pH 7.0. With the rat tissue homogenates and plasma preparations, the longer the ester chain the higher the susceptibility, except for 3', 5'-bis (3-carboxypropionyl) FUdR (I) with rat liver homogenate. Though the reactivity of I was the lowest with porcine liver esterase preparation and not measurable with rat intestinal homogenate and plasma, I showed the highest reactivity with the rat liver homogenate.
- 著者
- 川口 健夫 鈴木 嘉樹 中原 葉子 南部 直樹 永井 恒司
- 出版者
- The Pharmaceutical Society of Japan
- 雑誌
- Chemical and Pharmaceutical Bulletin (ISSN:00092363)
- 巻号頁・発行日
- vol.33, no.1, pp.301-307, 1985-01-25 (Released:2008-03-31)
- 参考文献数
- 17
- 被引用文献数
- 13 16
The activity of porcine liver esterase towards diesters of 5-fluoro-2'-deoxyuridine with saturated aliphatic acids including acetic, propionic, butyric, hexanoic, octanoic, decanoic and dodecanoic acids was investigated. The susceptibility of the 3', 5'-diesters increased as the acyl chain was lengthened up to octanoyl, but further increase in the acyl chain length resulted in a sharp decrease in the susceptibility. The susceptibility of 3'-and 5'-monoesters increased as the chain was lengthened to decanoyl and slightly decreased on going to dodecanoyl. These results suggest that the higher antitumor activity of longer alkyl chain diesters of 5-fluoro-2'-deoxyuridine is partly due to their slow rates of hydrolysis by non-specific esterase.
- 著者
- 川口 健夫 斉藤 政彦 鈴木 嘉樹 南部 直樹 永井 恒司
- 出版者
- The Pharmaceutical Society of Japan
- 雑誌
- Chemical and Pharmaceutical Bulletin (ISSN:00092363)
- 巻号頁・発行日
- vol.33, no.4, pp.1652-1659, 1985-04-25 (Released:2008-03-31)
- 参考文献数
- 18
- 被引用文献数
- 21 24
The bioactivation characteristics of 3', 5'-diesters of 5-fluoro-2'-deoxyuridine (FUdR) esterified with saturated aliphatic acids, including acetic, propionic, butyric, hexanoic, octanoic, decanoic, dodecanoic and trimethylacetic acids, were studied by using rat tissue homogenates and plasma. The susceptibility of the esters to hydrolysis by the biological media increased as the acyl promoiety was lengthened up to octanoyl. Further elongation resulted in decreasing susceptibility. Antitumor activity against L1210 of the esters with a longer chain or branched acyl group administered intraperitoneally and orally to tumor-bearing mice was also examined. Both the antitumor activity and the therapeutic index (ILSmax/ILS30) of the esters improved as the acyl promoiety was lengthened from octanoyl to dodecanoyl. These results suggested that the higher antitumor activities of longer alkyl chain diesters of FUdR are due to their slow rates of FUdR regeneration with esterases.
1 0 0 0 OA Stability and Several Physical Properties of Amorphous and Crystalline Forms of Indomethacin
- 著者
- 今泉 宏之 南部 直樹 永井 恒司
- 出版者
- The Pharmaceutical Society of Japan
- 雑誌
- Chemical and Pharmaceutical Bulletin (ISSN:00092363)
- 巻号頁・発行日
- vol.28, no.9, pp.2565-2569, 1980-09-25 (Released:2008-03-31)
- 参考文献数
- 13
- 被引用文献数
- 66 96
An X-ray diffraction method for determination of the degree of crystallinity of indomethacin was established, and the transition rate of indomethacin from amorphous to crystalline form was investigated. The transition of the amorphous form to crystalline form at 20°, 30°and 40°followed first-order kinetics and the Arrhenius plot showed good linearity. The amorphous form was shown to change to form I at 100% relative humidity (RH), to form I or II at 89% RH and to form I at 79% and 69% RH at 30°. The transition rate of the amorphous form to form II at 100% RH was larger than that at 89% RH. A good linear relation was observed between the maximum amount of water absorbed (log scale) and the degree of crystallinity at 100% or 89% RH at 30°. The dissolution rate of the amorphous form was higher than those of forms I and II. The amorphous form showed better tablet-forming properties than the crystalline form.