著者
相山 律男 永井 久子 沢田 誠吾 横倉 輝男 糸川 秀治 中西 守
出版者
The Pharmaceutical Society of Japan
雑誌
Chemical and Pharmaceutical Bulletin (ISSN:00092363)
巻号頁・発行日
vol.40, no.10, pp.2810-2813, 1992-10-25 (Released:2008-03-31)
参考文献数
16
被引用文献数
12 16

Self-association of irinotecan hydrochloride (CTP-11) in an aqueous solution was studied using UV, circular dichroism (CD), 1H-NMR and the quasi-elastic light scattering (QLS) method. The UV spectra showed a hypochromic effect in the aqueous solution. In the CD spectra, typically positive Davydov splitting was observed and the Δε value was reduced sigmoidally when the concentraion of CTP-11 was decreased. In the 1H-NMR, the aromatic signals of higher concentration shifted to a diamagnetic direction compared with those of lower concentration. These observations suggested that CPT-11 molecules are present as monomer in the lower concentration, and the self-association with positive helicity occurs by vertical stacking more than 10 μM of concentration. Its molecules form complete aggregates at more than 2 mM of the concentration. Results of QLS which coincided in the prediction of partition coefficient experiments suggested that CPT-11 molecules formed dimer under the condition. By the regression analysis of CD spectral data, the equilibrium constant for the self-association was calculated to be 2.41×10-4 M-1.
著者
沢田 誠吾 岡島 悟 相山 律男 野方 健一郎 古田 富雄 横倉 輝雄 杉野 栄一 山口 健太郎 宮坂 貞
出版者
The Pharmaceutical Society of Japan
雑誌
Chemical and Pharmaceutical Bulletin (ISSN:00092363)
巻号頁・発行日
vol.39, no.6, pp.1446-1454, 1991-06-25 (Released:2008-03-31)
参考文献数
18
被引用文献数
144 197

Nevel 36 derivatives (6), bonding the phenolic hydroxyl group of 7-ethyl-10-hydroxycamptothecin (4) with diamines through a monocarbamate linkage, were synthesized and their antitumor activity was evaluated in vivo. The derivatives were soluble in water as their HC1 salts wiht the E lactone ring intact and exhibited significant antitumor activity. One of the derivatives, 6-27 showed excellent activity against L1210 leukemia and other murine tumors.The structure of its hydrochloride trihydrate (CPT-11) was determined by spectroscopic and crystallographic methods.
著者
沢田 誠吾 岡島 悟 相山 律男 野方 健一郎 古田 富雄 横倉 輝雄 杉野 栄一 山口 健太郎 宮坂 貞
出版者
公益社団法人日本薬学会
雑誌
Chem. Pharm. Bull. (ISSN:00092363)
巻号頁・発行日
vol.39, pp.1446-1454, 1991
被引用文献数
9

Nevel 36 derivatives (6), bonding the phenolic hydroxyl group of 7-ethyl-10-hydroxycamptothecin (4) with diamines through a monocarbamate linkage, were synthesized and their antitumor activity was evaluated in vivo. The derivatives were soluble in water as their HC1 salts wiht the E lactone ring intact and exhibited significant antitumor activity. One of the derivatives, 6-27 showed excellent activity against L1210 leukemia and other murine tumors.The structure of its hydrochloride trihydrate (CPT-11) was determined by spectroscopic and crystallographic methods.