کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
70535 48837 2009 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Effects of organic solvents on activity and stability of lipases produced by thermotolerant fungi in solid-state fermentation
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی کاتالیزور
پیش نمایش صفحه اول مقاله
Effects of organic solvents on activity and stability of lipases produced by thermotolerant fungi in solid-state fermentation
چکیده انگلیسی

Dried solid-state fermented solids (biocatalysts) produced by seven thermotolerant fungal strains were tested for lipase activity and stability in organic solvents. Two strains of Rhizopus sp. (19 and 43a) produced biocatalysts (L-19 and L-43a) that showed high lipase activities (74 and 72 U/g of dry matter, respectively) comparable to Lipozyme® RM IM (118 U/g DM). The use of the dipole moment of the organic solvents along with their classification based on the functional groups (non-polar, protic polar, aprotic polar) allowed the establishment of four different relative activity profiles for the seven biocatalysts evaluated. Compared to a biocatalyst not exposed to the organic solvent (100% relative activity), all biocatalysts showed a high relative activity (greater than 90%) in aprotic polar solvents (acetonitrile, acetone and ethyl acetate), whereas in protic polar solvents (ethanol and i-propanol) activity was reduced (lower than 40%). In addition, the incubation of biocatalysts L-19 and L-43a in i-amyl alcohol increased lipase activity in the synthesis of ethyl oleate 3.36 and 1.46 times, respectively. L-19 activity also increased after incubation in toluene (2.0 times), i-propanol (1.5 times) and acetonitrile (1.3 times) at temperatures from 30 to 50 °C. The results suggest that these biocatalysts can be used for a broad range of lipase reactions.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Molecular Catalysis B: Enzymatic - Volume 61, Issues 3–4, December 2009, Pages 136–142
نویسندگان
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