Preparation and investigation of water soluble carbodiimides as immobilizing reagents of enzymes

✍ Scribed by Zsuzsa M. Jászay; Imre Petneházy; László Töke

• Book ID: 103956076
• Publisher: Elsevier Science
• Year: 1989
• Weight: 75 KB
• Volume: 10
• Category: Article
• ISSN: 0923-1137
• DOI: 10.1016/0923-1137(89)90061-4

✦ Synopsis

Oxidation of 1-decanethiol to didecyldisulfide by dioxygen in water at 35 °C is catalyzed by soluble cobalt phthalocyaninetetra(sodium sulfonate) (CoPcTsNa4) and by CoPcTs bound to cationic latexes. The latexes were prepared by emulsion copolymerization of styrene, divinylbenzene, and cationic surfactant monomers containing styrene or methacrylic ester functional groups. The 60 nm diameter colloidal catalyst prepared with (2met hacroyloxyethyl)dimethyloctadecylammonium bromide [H 2C=C(CH 3)COOCH 2CH 2 N(CH 3) 2 (CH 2)17 CH ~-Br-] is about 11 times more active than the soluble catalyst. Rates of oxidation are enhanced by basic pH. The higher activities of the colloidal catalysts are attributed to adsorption of the thiol or thiolate ion to polymer near the active sites.