title: Synthesis and anaerobic biodegradation of indomethacin-conjugated cellulose ethers used for colon-specific drug delivery.
abstract: Water soluble cellulose ethers, including methylcellulose and two hydroxyethylcelluloses with different molecular weights, were conjugate with indomethacin at room temperature. The chemical structures of the conjugates were characterized by FTIR, (1)H NMR and UV-vis spectroscopy. The results confirmed that different amounts of IND residues were covalently bonded to cellulose ether backbones through ester linkages. Their anaerobic biodegradation in colonic fermentation was investigated by gel permeation chromatography, gas chromatography and UV-vis spectroscopy. These conjugates were found to have different biodegradabilities, depending on the cellulose ether used and the amount of conjugated indomethacin residues. In vitro release experiments showed that hydroxyethylcellulose-based conjugates with low IND residues content could exhibit a sustained drug release behavior in colonic fermentation and were stable in the simulated media of the stomach and small intestine. Therefore, they are promising candidates for future applications in colon-specific drug delivery.
authors.affiliation: Institute of Polymer Science, School of Chemistry and Chemical Engineering, Sun Yat-Sen University, Xingang West Road 135, Guangzhou, Guangdong 510275, PR China.
authors.forename: Xiang
authors.initials: X
authors.lastname: Cai
authors.forename: Liqun
authors.initials: L
authors.lastname: Yang
authors.forename: Li-Ming
authors.initials: LM
authors.lastname: Zhang
authors.forename: Qing
authors.initials: Q
authors.lastname: Wu
mesh_terms: D000693:Anaerobiosis; D000894:Anti-Inflammatory Agents, Non-Steroidal / Q000378:metabolism*; D002482:Cellulose / Q000737:chemistry*; D002849:Chromatography, Gas; D002850:Chromatography, Gel; D003106:Colon / Q000378:metabolism*; D016503:Drug Delivery Systems; D004987:Ethers; D005285:Fermentation; D007213:Indomethacin / Q000378:metabolism*; D009682:Magnetic Resonance Spectroscopy; D013056:Spectrophotometry, Ultraviolet; D017550:Spectroscopy, Fourier Transform Infrared
chemical_list: D000894:Anti-Inflammatory Agents, Non-Steroidal; D004987:Ethers; D002482:Cellulose; D007213:Indomethacin