Asian Journal of Microbiology, Biotechnology & Environmental Sciences Paper

Vol 10, Issue 2, 2008; Page No.(361-364 )

COMPARATIVE STUDIES ON SUBMERGED, LIQUID SURFACE AND SOLID STATE FERMENTATION FOR CITRIC ACID PRODUCTION BY ASPERGILLLIS NIGER RCNM 17

G. NA RAYANAMURTHY, Y. L. IZAMACHANDRA, S. PADMALATHA RAI, P. S. SUJAN GA NAPATHY, B. T. KAVITHA AND Y.N. MANOHARA,

Abstract

A comparative study on three different fermentation techniques was carried out for citric acid production by a new soil isolate Aspergillus niger RCNM 17 using Shu and Johnson's (1948a) medium. A. mger RCNM 17 produced highest titer of citric acid in Solid State Fermentation (61.08 g citric acid at 72 h with 43.61 % and 53.19 ┬░AD conversions based on the total initial sugar and the sugar consumed during fermentation respectively) compared to Submerged Fermentation (10.23 g citric acid/1 at 168 h with 7.32 and 9.65 % conversions based on the total initial sugar and the sugar consumed during fermentation respectively) and Liquid Surface Fermentation ( 24.37 g citric acid/1 at 144 h with 17.40 % and 24.72 `)/0 conversions based on the total initial sugar and the sugar consumed during fermentation respectively).

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