Production of extracellular lipases by Rhizopus oligosporus in a stirred fermentor

Revista de microbiologia

Haq, Ikram ul¹  Niaz, Mubashir²  Iftikhar, Tehreema³  Zia, Muhammad Anjum⁴ 

[1] GC Universit;GC University Faisalabad;GC University Lahore;University of Agriculture Faisalabad, Pakistan

关键词: Extracellular lipases;    Rhizopus oligosporus;    fermentor;    kinetics.;   

DOI  :  10.1590/S1517-83822010000400034

学科分类：农业科学（综合）

来源: Sociedade Brasileira de Microbiologia / Brazilian Society for Microbiology

【 摘 要 】

The present investigation deals with the kinetics of submerged extracellular lipases fermentation by both wild and mutant strains of Rhizopus oligosporus var. microsporus in a laboratory scale stirred fermentor. Other parameters studied were inoculum size, pH, agitation and rate of aeration. It was found that the growth and lipases production was increased gradually and reached its maximum 9.07± 0.42ª U mL-1 (W) and 42.49 ± 3.91ª U mL-1 (M) after 30h of fermentation for both wild and mutant strain. There is overall increase of 109% (W) and 124% (M) in the production of extracellular lipases as compared to shake flask. Another significant finding of the present study is that the fermentation period is reduced to 30 h in case of wild and 23 h in case of mutant from 48 h in shake flask studies. The specific productivity of mutant strain (qp = 377.3 U/g cells/h) was several folds higher than wild strain. The specific production rate and growth coefficient revealed the hyperproducibility of extracellular lipases using mutant IIB-63NTG-7.

【 授权许可】

CC BY-NC