Influence of some trace metals and stimulants on citric acid production from brewery wastes by Aspergillus niger |
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| Institution: | 1. Department of Chemical and Materials Engineering, Faculty of Engineering, The University of Auckland, Private Bag 92019, Auckland, New Zealand;2. CAPEC-PROCESS Research Center, Department of Chemical and Biochemical Engineering, Technical University of Denmark, Søltofts Plads, Building 229, DK-2800 Kgs. Lyngby, Denmark |
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| Abstract: | The addition of increasing levels of Mn2+, Fe3+, Zn2+, Co2+, Cu2+, Ca2+, sodium monofluoracetate and methanol during citric acid surface fermentation of spent grain liquor by Aspergillus niger (ATCC 9142) was investigated. For spent grain liquor the addition of 51 ppb Mn2+, 5 ppb Fe3+, 75 ppb Zn2+ and 4% (v/va) methanol caused a 4.9, 1.9, 10.9 and 16.8% increase in citric acid yield respectively. In all other fermentations the yield of citric acid was decreased whereas the biomass production in some cases was increased. |
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