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1

Fungus lipases and their activity in the hydrolisis reaction and in the synthesis of fatty acid esters

100%
Antczak T., Krystynowicz A., Galas E.
Biotechnologia
|
1995
|
issue 2
82-91
EN
Preparations of soluble and immobilized fungus lipases showing high catalityc acivity in hydrolysis of acyloglycerols in water, synthesis of esters of higher fatty acids in hydrolysis of acyloglycerols in water and synthsis of esters of higher fatty acids inorganic solvents milieu were obtained.The course of reaction andthe activity dependedon: the lipase source, the form of enzyme and the reaction milieu.The studied extacellular lipases, in a water - soluble form (especially R.nigricans lipase), exibited high activity in olive oil hydrolisis.The lipases were not active in esters synthesis in diphase system: water-organic solvent.Being drained by liophilization they demonstrated the activity in esters synthesis inorgnic solvents milieu.The endocellular lipases immobilized in situshowed the hihgest activity in the synthesis of esters in organic milieu.These enzymes can also be used for hydrolysis of acyloglycerols.The obtained liquid and immobilized mycelial preparations demonstrate activity which qualifies them for industrial scale application.
2

Mathematical modelling of esters synthesis catalyzed by Mucor javanicus lipase in non water environment

100%
Antczak T., Galas E.
Biotechnologia
|
1997
|
issue 3
121-133
EN
A mathematical model describing esters synthesis catalysed by lipase from Mucor jawanicus was designed.This model was confirmed by the syntheses of propyl stearate, butyl stearate and oleyl stearate catalysed by M.javanicus lipase.Using this model it is possible to estimate the maximum achievable yield of ester synthesis.The model can also applied for performing simulation to evaluate the effect of particular elements on the yield of ester synthesis and, consequently, it could enable the optimum selection of particular elements of the reaction system.
3

An optimization of esters synthesis catalysed by Mucor javanicus T45 lipase in non-water media

75%
Antczak T., Galas E.
Biotechnologia
|
1995
|
issue 2
73-81
EN
An optimization of enzymatic synthesis of esters in nonwater environment was performedby mens of a gradient method.The studies were aimed at obtaining a model synthesis of butyl oleate catalyzed by Mucor javanicus T45 lipase.Theoptimized, changed parameters were as follows:substrated mass, lipase mass and chemical activator mass (diethanoloamine) which profitably modified the essential water layer of the lipase.For the initial concentration of the substrates equal to 57-67%, in reaction environment the obtained yield of coversion of oleic acid was in the range of 90-95%. A transfer of optimized conditions of butyl oleate synthesis onto oleates of the other aliphatic alcohols, enabled elaboration of simple in performance methods of synthesisof a broad variety of esters of oleic acid and aliphatic alcohols (C2-C18).
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