The role of water on the equilibrium of esterification by immobilized lipase packed-bed column reactor
SummaryThe role of water on the continous synthesis of geranyl esters by immobilized lipase fromHumicola lanuginosa No. 3 was studied in a packed-bed column reactor (PBR) installed with a molecular sieve column for water extraction. The conversion degress by PBR were highly influenced by the water concentration throughout the reaction which acted as a determinant on the reaction equilibrium. Almost 100% conversion of geranyl laurate could be achieved under the optimum water-controlled conditions. The stability of the PBR system was for 35 days with the half-life of 38 days.
Some Characteristics of Continuous Glyceride Synthesis by Lipase in a Microporous Hydrophobic Membrane Bioreactor
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 ...
Standard methods for the analysis of oils, fats and derivatives, 6th Edition. 1st Supplement: Part 5 (1982) Section III, Glycerines. Section IV, Alkaline soaps
Abstract