title: Production of ascorbyl palmitate by surfactant-coated lipase in organic media.
abstract: The surface of a lipase from Burkholderia cepacia was coated with a nonionic surfactant, propylene glycol monostearate, and was used as a biocatalyst in the production of ascorbic acid in tert-butyl alcohol. The influence of various factors such as the type of surfactant, the pH of the buffer used for coating, the amount of surfactant in the coating, the organic solvent, and the temperature and molar ratio of the substrates used in the reaction on the conversion of ascorbyl palmitate were studied. After 24 h of reaction at 50 degrees C, a conversion of 47% was obtained using an ascorbic acid to palmitic acid molar ratio of 1:6. The native lipase showed only 6% conversion.
authors.affiliation: Department of Chemical Engineering, National Tsing Hua University, Hsinchu, Taiwan.
authors.forename: Hsin-Ju
authors.initials: HJ
authors.lastname: Hsieh
authors.forename: Giridhar R
authors.initials: GR
authors.lastname: Nair
authors.forename: Wen-Teng
authors.initials: WT
authors.lastname: Wu
mesh_terms: D001205:Ascorbic Acid / Q000031:analogs & derivatives* / Q000096:biosynthesis / Q000378:metabolism; D016956:Burkholderia cepacia / Q000201:enzymology; D006863:Hydrogen-Ion Concentration; D007700:Kinetics; D008049:Lipase / Q000378:metabolism*; D019946:Propylene Glycol; D013501:Surface-Active Agents; D020002:tert-Butyl Alcohol
chemical_list: D013501:Surface-Active Agents; D019946:Propylene Glycol; D008049:Lipase; D020002:tert-Butyl Alcohol; D001205:Ascorbic Acid; C031226:6-O-palmitoylascorbic acid