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Utilisation of potato processing wastewater for microbial lipids and γ ‐linolenic acid production by oleaginous fungi
Author(s) -
Muniraj Iniya Kumar,
Xiao Liwen,
Liu He,
Zhan Xinmin
Publication year - 2015
Publication title -
journal of the science of food and agriculture
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.782
H-Index - 142
eISSN - 1097-0010
pISSN - 0022-5142
DOI - 10.1002/jsfa.7044
Subject(s) - food science , aspergillus flavus , polyunsaturated fatty acid , chemistry , mucor , nutrient , wastewater , raw material , linolenic acid , fatty acid , biochemistry , linoleic acid , penicillium , waste management , organic chemistry , engineering
BACKGROUND Microbial lipids are considered as the starting material for production of second‐generation biofuels and their polyunsaturated fatty acids are rich sources of neutraceuticals. Exploring cheap feedstock for producing microbial lipids is necessary. The present study examined the potential of microbial lipids and γ ‐linolenic acid ( GLA ) production by two oleaginous fungi, Aspergillus flavus I16 ‐3 and Mucor rouxii , with potato processing wastewater as a low‐cost or no‐cost nutrient source. RESULTS Biochemistry and physiology of two oleaginous fungi, A. flavus I16 ‐3 and M. rouxii , on lipid accumulation showed the two fungi grew well and efficiently utilised the starch in wastewater. On average ( P < 0.05), 2.8 and 3.6 g L −1 of lipids were produced by A. flavus I16 ‐3 and M. rouxii , respectively, with maximum GLA yields of 60 and 100 mg L −1 . Addition of nutrients to raw wastewater significantly improved ( P < 0.05) the lipid and GLA yields; 3.5 and 4.2 g L −1 of lipids, and 100 and 140 mg L −1 of GLA were produced by A. flavus I16 ‐3 and M. rouxii , respectively. In addition, the wastewater was efficiently treated, with soluble chemical oxygen demand, total soluble nitrogen and total soluble phosphorus removals up to 60% and 90%, 100% and 98%, and 92% and 81% by A. flavus I16 ‐3 and M. rouxii , respectively. CONCLUSION This study demonstrated an alternative approach to valorise potato processing wastewater to produce microbial lipids and GLA (nutraceuticals). © 2014 Society of Chemical Industry