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Valorisation of side streams from wheat milling and confectionery industries for consolidated production and extraction of microbial lipids

Tsakona, S., Skiadaresis, A. G., Kopsahelis, N., Chatzifragkou, A., Papanikolaou, S., Kookos, I. K. and Koutinas, A. A. (2016) Valorisation of side streams from wheat milling and confectionery industries for consolidated production and extraction of microbial lipids. Food Chemistry, 198. pp. 85-92. ISSN 0308-8146

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To link to this item DOI: 10.1016/j.foodchem.2015.11.031

Abstract/Summary

Crude enzymes produced via solid state fermentation (SSF) using wheat milling by-products have been employed for both fermentation media production using flour-rich waste (FRW) streams and lysis of Rhodosporidium toruloides yeast cells. Filter sterilization of crude hydrolysates was more beneficial than heat sterilization regarding yeast growth and microbial oil production. The initial carbon to free amino nitrogen ratio of crude hydrolysates was optimized (80.2 g/g) in fed-batch cultures of R. toruloides leading to a total dry weight of 61.2 g/L with microbial oil content of 61.8 % (w/w). Employing a feeding strategy where the glucose concentration was maintained in the range of 12.2 – 17.6 g/L led to the highest productivity (0.32 g/L∙h). The crude enzymes produced by SSF were utilised for yeast cell treatment leading to simultaneous release of around 80% of total lipids in the broth and production of a hydrolysate suitable as yeast extract replacement.

Item Type:Article
Refereed:Yes
Divisions:Faculty of Life Sciences > School of Chemistry, Food and Pharmacy > Department of Food and Nutritional Sciences > Food Research Group
ID Code:46913
Publisher:Elsevier

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