کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
36437 45132 2006 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Production of flavour esters by immobilized Staphylococcus simulans lipase in a solvent-free system
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی بیو مهندسی (مهندسی زیستی)
پیش نمایش صفحه اول مقاله
Production of flavour esters by immobilized Staphylococcus simulans lipase in a solvent-free system
چکیده انگلیسی

Ethyl valerate (green apple flavour) and hexyl acetate (pear flavour) are short-chain esters with fruity notes that are widely used in food, cosmetic and pharmaceutical industries. Crude Staphylococcus simulans lipase was immobilized on different supports. The CaCO3 was selected as the most suitable support offering maximum adsorption capacity. Different reaction parameters for enhancing ester formation were investigated. In fact, higher conversion of ethyl valerate (51%) was achieved by the addition of 20% (w/w) of water to the reaction mixture, using 200 IU of immobilized lipase, a molar ratio valeric acid to ethanol of 1 and at 37 °C. No decrease of the synthesis activity was observed for 10 cycles of use of the immobilized lipase. In the case of the hexyl acetate, the optimum conditions, giving 41% of conversion, are obtained with 10% (w/w) of initially added water, 100 IU of immobilized lipase, a molar ratio acetic acid to hexanol of 1 and at 37 °C. Immobilized lipase could be repeatedly used for five cycles without a decrease of synthesis activity.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Process Biochemistry - Volume 41, Issue 7, July 2006, Pages 1692–1698
نویسندگان
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