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Citric Acid Production on a Waste Starch Fraction Hydrolysate

Cirila Colnar1, Aleksa Cimerman2 and A. Perdih3


1
HELIOS, Domžale, Slovenia

2National Institute of Chemistry, Ljubljana, Slovenia
3Department of Chemistry and Chemical Technology, University of Ljubljana, Ljubljana, Slovenia

Article history:

Received January 8, 1994

Accepted April 21, 1994

Summary:

The waste fraction in wheat starch production, starch B, was hydrolysed by means of liquefying and saccharifying enzymes to prepare a substrate for submerged citric acid fermentation. A suitable Aspergillus niger strain was used. Improved yields could be obtained by growing the inoculum on a starch containing agar. The effect of trace metals in the substrate was reduced by the addition of potassium hexacyanoferrate(II).

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