Antimicrobial cationic polymers having one or two cationic polycarbonate chains were prepared by organocatalyzed ring opening polymerization. One antimicrobial cationic polymer has a polymer chain consisting essentially of cationic carbonate repeat units linked to one or two end groups. The end groups can comprise a covalently bound form of biologically active compound such as cholesterol. Other antimicrobial cationic polymers have a random copolycarbonate chain comprising a minor mole fraction of hydrophobic repeat units bearing a covalently bound form of a vitamin E and/or vitamin D2. The cationic polymers exhibit high activity and selectivity against Gram-negative and Gram-positive microbes and fungi.
Steroids of the formula ##STR1## wherein R.sup.1 to R.sup.4, X and n have the significance given in the description, which lower the intestinal resorption of cholesterol and plasma cholesterol and a process of making same from corresponding steroids having an alcohol residue of the formula --O--X--OH in the 3-position.
1,3,6-DIOXAZOCAN-2-ONES AND ANTIMICROBIAL CATIONIC POLYCARBONATES THEREFROM
申请人:Agency for Science, Technology and Research
公开号:US20150264932A1
公开(公告)日:2015-09-24
Eight-membered ring cyclic carbonates comprising a ring nitrogen at position 6 (1,3,6-dioxazocan-2-ones) were prepared by reaction of precursor diols with active carbonates. The ring nitrogen is linked to a pendant group Y′ via a methylene linking group. The cyclic carbonates undergo organocatalyzed ring opening polymerization to form an initial polycarbonate comprising a backbone tertiary amine group. Quaternization of the initial polycarbonates forms cationic polycarbonates comprising a positive-charged backbone quaternary nitrogen. The cationic polycarbonates can be potent antimicrobial agents.
VITAMIN FUNCTIONALIZED GEL-FORMING BLOCK COPOLYMERS FOR BIOMEDICAL APPLICATIONS
申请人:INTERNATIONAL BUSINESS MACHINES CORPORATION
公开号:US20140301970A1
公开(公告)日:2014-10-09
Gel-forming block copolymers were prepared comprising i) a central hydrophilic block consisting essentially of a divalent poly(ethylene oxide) chain and ii) two peripheral monocarbonate or polycarbonate hydrophobic blocks. The hydrophobic blocks comprise one or more vitamin-bearing subunits. The vitamin-bearing subunits comprise a carbonate backbone portion and a side chain comprising a covalently bound form of a vitamin. The gel-forming block copolymers can be used to prepare various biodegradable and/or biocompatible hydrogel and organogel drug compositions, in particular antimicrobial and/or anti-tumor drug compositions. The hydrogel compositions can be suitable for depot injections. Synergistic enhancement of toxicity to microbes was observed with compositions comprising an antimicrobial cationic polymer and an antimicrobial compound.