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:US20180117162A1
公开(公告)日:2018-05-03
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 linked to the central block by linking groups bearing one or more hydrogen bond forming *—N(H)—* groups. The hydrophobic blocks comprise one or more vitamin-bearing subunits. 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 have utility in depot injections for drug delivery. The hydrogen bonding *—N(H)—* group(s) provide longer in vivo lifetime of the hydrogel before degradation and a more prolonged and controlled release rate of a hydrophobic drug compared to similar hydrogels prepared from poly(ethylene glycol).
[EN] ANTIMICROBIAL GUANIDINIUM AND THIOURONIUM FUNCTIONALIZED POLYMERS<br/>[FR] POLYMÈRES FONCTIONNALISÉS PAR GUANIDINIUM ET THIOURONIUM ANTIMICROBIENS
申请人:AGENCY SCIENCE TECH & RES
公开号:WO2016186581A1
公开(公告)日:2016-11-24
Antimicrobial cationic polycarbonates and polyurethanes have been prepared comprising one or more pendent guanidinium and/or isothiouronium groups. Additionally, antimicrobial particles were prepared having a silica core linked to surface groups comprising a guanidinium and/or isothiouronium group. The cationic polymers and cationic particles can be potent antimicrobial agents against Gram-negative microbes, Gram-positive microbes, and/or fungi.
Synergistic Co-Delivery of Membrane-Disrupting Polymers with Commercial Antibiotics against Highly Opportunistic Bacteria
作者:Victor Wee Lin Ng、Xiyu Ke、Ashlynn L. Z. Lee、James L. Hedrick、Yi Yan Yang
DOI:10.1002/adma.201302952
日期:2013.12
A series of vitamin E‐containing biodegradableantimicrobialcationicpolycarbonates is designed and synthesized via controlled organocatalytic ring‐opening polymerization. The incorporation of vitamin E significantly enhances antimicrobial activity. These polymers demonstrate broad‐spectrumantimicrobial activity against various microbes, e.g., S. aureus (Gram‐positive), E‐coli (Gram‐negative) and
CYCLIC CARBONATE MONOMERS AND RING OPENED POLYCARBONATES THEREFROM
申请人:International Business Machines Corporation
公开号:US20160009860A1
公开(公告)日:2016-01-14
Eight-membered ring cyclic carbonates having an oxygen or an acylated nitrogen at position 6 were prepared by reaction of precursor diols with ethyl chloroformate. The cyclic carbonates undergo organocatalyzed ring opening polymerization. In one instance, the initial polymer formed comprises a carbonate repeat unit having a Boc-protected nitrogen in the polymer backbone. Deprotecting the nitrogen with acid forms a cationic carbonate repeat unit having a positive charged secondary ammonium nitrogen in the polymer backbone.