Ability of Aspergillus niger to tolerate metal ions and minerals in a solid-state fermentation system for the production of citric acid.

Shankaranand, V. S. and Lonsane, B. K. (1994) Ability of Aspergillus niger to tolerate metal ions and minerals in a solid-state fermentation system for the production of citric acid. Process Biochemistry, 29 (1). 29-37, 54 ref..

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Abstract

Biosynthesis ofcihic acid by Aspergillus niger in molasses medium in submerged and liquid surface fermentations is highly sensitive to the concentration of trace elements present in the medium. Studies on citric acid production in wheatbran medium in a solid-state fermentation system, however, showed no such influence despite high concentrations of metal ions and total ash content in the wheatbran. In contrast, supplementation of wheatbran with additional amounts of mineral ions such as iron, copper, zinc, manganese, magnesium and phosphorous was found to be necessary for increased production of citric acid. All the mineral ions when used individually at an optimum level increased cim’c acid production by 1.4-1-9 times. However, only iron, copper andzinc were effective in combination. Citric acid production with this combination was 4921 g/kg commercial wheatbran at 48 h as against 22.49 g formed in the absence of any added metal ions at the same fermentation time. These results indicate that the advantage of solid-state fermentations in tolerating high concentrations of metal ions in the production of citric acid is probably due to concentration gradients and impaired transport of the metal ions in the conditions of limited water availability.

Item Type:	Article
Uncontrolled Keywords:	Biosynthesis,citric acid, Aspergillus niger, molasses, liquid surface fermentations
Subjects:	600 Technology > 05 Chemical engineering > 04 Fermentation Technology 500 Natural Sciences and Mathematics > 07 Life Sciences > 04 Microbiology
Divisions:	Fermentation Technology and Bioengineering
Depositing User:	Food Sci. & Technol. Information Services
Date Deposited:	17 Jun 2011 05:27
Last Modified:	28 Dec 2011 09:41
URI:	http://ir.cftri.res.in/id/eprint/2630

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