Journal
JOURNAL OF CONTROLLED RELEASE
Volume 110, Issue 2, Pages 323-331Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jconrel.2005.10.004
Keywords
HPMA copolymer; 9-aminocamptothecin conjugate; colon-specific drug delivery; drug release; aromatic azo bond cleavage; 1,6-elimination
Funding
- NCI NIH HHS [CA 51578] Funding Source: Medline
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N-(2-Hydroxypropyl)methaerylamide (HPMA) copolymer-9-aminocamptothecin (9-AC) conjugate for oral colon-specific drug delivery was designed, synthesized, and characterized. The drug, 9-AC, was attached to the polymer carrier via a spacer containing a combination of an aromatic azo, bond and a 4-aminobenzylcarbamate group. The design of the spacer ensured a fast and highly efficient release of unmodified 9-AC from the polymer in the colon by azo bond cleavage followed by a 1,6-elimination mechanism. An in vitro degradation study indicated that this conjugate was stable in simulated upper GI tract conditions, including small intestine (ST) contents, SI mucosa suspension, and in PBS (pH 1.5 and 7.4). A fast release of the unmodified drug (85 +/- 10% of 9-AC in 12 h) was detected in rat cecal contents. This drug delivery system has potential in the treatment of colon cancer. (c) 2005 Elsevier B.V. All rights reserved.
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