Optimization of Protease Production by Bacillus mojavensis A21 on Chickpea and Faba Bean

Samiha Mhamdi; Anissa Haddar; Ibtissem Hamza Mnif; Fakher Frikha; Moncef Nasri; Alya Sellami Kamoun

doi:10.4236/abb.2014.514120

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ABB> Vol.5 No.14, December 2014

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Optimization of Protease Production by Bacillus mojavensis A21 on Chickpea and Faba Bean

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DOI: 10.4236/abb.2014.514120 3,624 Downloads 4,756 Views Citations

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Samiha Mhamdi¹, Anissa Haddar¹, Ibtissem Hamza Mnif¹, Fakher Frikha², Moncef Nasri¹, Alya Sellami Kamoun^1,2*

Affiliation(s)

¹Laboratoire de Génie Enzymatique et de Microbiologie, Université de Sfax, Ecole Nationale d’Ingénieurs de Sfax, Sfax, Tunisia.
²Université de Sfax, Faculté des Sciences de Sfax, Sfax, Tunisia.

ABSTRACT

Response surface methodology (RSM) was employed to optimize the medium composition and culture conditions for the production of alkaline proteases by Bacillus mojavensis A21 on uncommon substrates: chickpea (CF) and faba bean (FF) flours. A significant positive influence of temperature, CF, FF, incubation time and inoculums size on the protease production was evaluated by Plackett Burman Design. Among these, CF was the most influential factor. The enhancement of protease to 9127 U/ml was achieved with the optimization procedure on the medium composed of (g/l): CF, 40; FF 30, NaCl 2.0; KH2PO4 1; K2HPO4 1; CaCl2, 0.1; MgSO4 0.1. The cultures were conducted for 72 hours with an IS of 2%, at 30°C, an agitation speed of 150 rpm and an initial pH of 8.0. More interestingly, the optimization was accomplished using two cheap and local fermentation substrates, CF and FF, which could result in a significant reduction in the cost of medium constituents. The maximum alkaline protease production was 9127 U/ml after 72 h of incubation and showed 5-fold increase in protease production over the initial level.

KEYWORDS

Bacillus mojavensis, Protease, Chickpea, Faba Bean, Plackett Burman Design

Conflicts of Interest

The authors declare no conflicts of interest.

Cite this paper

Mhamdi, S. , Haddar, A. , Mnif, I. , Frikha, F. , Nasri, M. and Kamoun, A. (2014) Optimization of Protease Production by Bacillus mojavensis A21 on Chickpea and Faba Bean. Advances in Bioscience and Biotechnology, 5, 1049-1060. doi: 10.4236/abb.2014.514120.

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