In the lab, expensive yeast and peptone extracts have been used to provide these nutrients for fermentation. However, the cost of the fermentation medium is also one of the principal factors that determines the economic viability of the ethanol production, it is very necessary to find low cost medium components that can supply all the nutritional requirements for good growth and fermentation activity.
Corn steep liquor (CSL) is a liquid by-product of wet milling process of maize-starch industry.It is a sole inexpensive source of nitrogen, vitamins, amino acids and other nutrients, which has been used in the lab study of fermentation and demonstrated the favorable effects compared with traditional complex media formulations for the fermentation.
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