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Continuous synthesis of oleic acid glycerides by seven lipases available commercially were compared at 40°C using the microporous hydrophobic membrane bioreactor we developed recently. The lipases produced by Rhizopus japonicus, Candida cylindracea, and Phycomyces nitens were quickly inactivated in 97% glycerol solution and yielded very low glyceride conversions. The other four lipases yielded glyceride synthesis activities in the order: Rhizopus delemer’s<Pseudomonas fluorescens’s< Mucor miehei’s<Chromobacterium viscosum’s. For these four lipases, there was a hyperbola-like relationship between the conversion and the amount of lipase adsorbed at the membrane during the reaction. The adsorbed lipase desorbed relatively easily when glycerol-water-lipase solution was replaced by fresh 97% glycerol solution having no lipases. Mucor miehei’s lipase was adsorbed more strongly than Chromobacterium viscosum’s. The product produced by Mucor miehei’s lipase was composed mostly of mono- and di-glycerides while the ...

agricultural and biological chemistry

Bioreactor for enzymic reaction of fat and fatty acid derivatives. Part II. Some characteristics of continuous glyceride synthesis by lipase in a microporous hydrophobic membrane bioreactor.