Evaluation of N-succinyl-chitosan as a systemic long-circulating polymer.
The water-soluble, low toxic and less biodegradable chitosan derivative N-succinyl-chitosan (Suc-chitosan) was investigated for body distribution and urinary excretion on a long-time scale (24-72 h after i.v. injection) using a fluorescein-labeling technique. Fluorescein isothiocyanate (FITC)-labeled Suc-chitosan (Suc-chitosan-FTC) was characterized for molecular weight, succinylation degree and FTC content. Systemic retention and tissue distribution of Suc-chitosan-FTC were examined after i.v. administration to normal and Sarcoma 180 tumor-bearing mice. Suc-chitosan-FTC was sustained at a high level in the circulation over 72 h; that is, the plasma half-life in normal mice was 100.3 h and that in tumor-bearing mice was 43.0 h, which was longer than those of other long-circulating macromolecules reported to date. As to the tissues except blood circulation, Suc-chitosan-FTC was distributed very little in tissues other than the tumor. Although the total amount of Suc-chitosan-FTC residing in tested tissues decreased gradually, urinary excretion did not increase from 24 h after injection. These observations suggested that Suc-chitosan-FTC may be eliminated by mechanisms other than in the urine or moved to tissues other than those tested. The ratio of tumor accumulation reached a plateau at 48 h after injection, and the accumulation level, approximately 10%, was similar to those observed for other reported long-circulating macromolecules.
Kato
Y
Y
Department of Clinical Pharmacy, Hoshi University, Tokyo, Japan. d711@hoshi.ac.jp
Onishi
H
H
Machida
Y
Y
D000818:Animals; D001672:Biocompatible Materials / Q000493:pharmacokinetics*; D001711:Biotransformation; D002686:Chitin / Q000031:analogs & derivatives* / Q000097:blood / Q000493:pharmacokinetics / Q000652:urine; D048271:Chitosan; D006207:Half-Life; D007275:Injections, Intravenous; D008297:Male; D051379:Mice; D008815:Mice, Inbred Strains; D012510:Sarcoma 180 / Q000378:metabolism*; D014018:Tissue Distribution
D001672:Biocompatible Materials; C118639:N-succinyl-chitosan; D002686:Chitin; D048271:Chitosan