title: Synthesis and antibacterial activity of new long-chain-alkyl bile acid-based amphiphiles.
abstract: The efficient synthesis of some bile acid-derived cationic amphiphiles with a flexible long hydrocarbon tail was investigated. Firstly, the modification on the side-chain carboxyl of bile acids was carried out efficiently by one-pot amidation of bile acids and a long-chain aliphatic amine in the presence of HOBt and DCC to introduce a flexible long hydrocarbon tail. Then the hydrophilic concave side of bile acids with hydroxyl groups was further modified into cationic groups for strengthening hydrophilicity. This strategy offered a very straightforward and efficient method for access to the designed amphiphiles in good overall yields. The preliminary results showed that an increase both in the length of the hydrophobic tail and in the number of charged groups resulted in a decrease in the CMC of bile acid-derived cationic amphiphiles. And the bile acid-derived cationic amphiphiles with a flexible longer hydrocarbon tail and more positive charges had the highest antibacterial and antimicrobial activity.
authors.affiliation: School of Chemistry and Chemical Engineering, Yangzhou University, 180 Siwangting Street, Yangzhou 225002, Jiangsu, PR China.
authors.forename: Weijian
authors.initials: W
authors.lastname: Ye
authors.forename: Yun
authors.initials: Y
authors.lastname: Li
authors.forename: Zhengquan
authors.initials: Z
authors.lastname: Zhou
authors.forename: Xingbin
authors.initials: X
authors.lastname: Wang
authors.forename: Juan
authors.initials: J
authors.lastname: Yao
authors.forename: Juanjuan
authors.initials: J
authors.lastname: Liu
authors.forename: Cunde
authors.initials: C
authors.lastname: Wang
mesh_terms: D039903:Actinobacteria / Q000187:drug effects*; D000900:Anti-Bacterial Agents / Q000138:chemical synthesis* / Q000737:chemistry / Q000494:pharmacology*; D001412:Bacillus subtilis / Q000187:drug effects*; D001647:Bile Acids and Salts / Q000737:chemistry / Q000494:pharmacology*; D004305:Dose-Response Relationship, Drug; D004926:Escherichia coli / Q000187:drug effects*; D057927:Hydrophobic and Hydrophilic Interactions; D008826:Microbial Sensitivity Tests; D008968:Molecular Conformation; D012477:Salmonella enteritidis / Q000187:drug effects*; D013329:Structure-Activity Relationship
chemical_list: D000900:Anti-Bacterial Agents; D001647:Bile Acids and Salts
keywords: Antibacterial activity; Bile acid; Cationic amphiphile; Chenodeoxycholic acid