Record number :
Title of article :
Mycelium-bound carboxylesterase from Aspergillus oryzae: an efficient catalyst for acetylation in organic solvent
Author/Authors :
F. Molinari، نويسنده , , R. Gandolfi، نويسنده , , A. Converti، نويسنده , , M. Zilli، نويسنده ,
Issue Information :
روزنامه با شماره پیاپی سال 2000
Pages :
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Abstract :
Dry mycelium of a strain of Aspergillus oryzae efficiently catalyzed the esterification between free acetic acid and primary alcohols (geraniol and ethanol) in organic solvent. The growth conditions to obtain high activity of mycelium-bound enzymes were firstly evaluated. A medium containing Tween 80 as carbon source furnished mycelium with the highest activity in the hydrolysis of α-naphthyl esters (α-N-acetate, butyrate, caprylate). Dry mycelium was employed to select suited conditions for an efficient acetylation of ethanol and geraniol in heptane. Maximum productions were obtained using 30 g l−1 of lyophilized cells: 12.4 g l−1 of geranyl acetate were produced at 80°C starting from 75 mM geraniol and acetic acid (84% molar conversion) and 4.1 g l−1 of ethyl acetate at 50°C from 50 mM ethanol and acetic acid (94% molar conversion) after 24 h. The stability of the mycelium-bound carboxylesterases are notable since only 10–30% loss of activity was observed after 14 days at temperatures between 30 and 50°C.
Keywords :
Organic solvent , Aspergillus oryzae , Biotransformation , Lipase , Esterase , Acetylation , Esterification
Journal title :
Enzyme and Microbial Technology
Link To Document :