Optimization of the Operational Conditions to Produce Extracellular and Cell-Bound Biosurfactants by Aneurinibacillus aneurinilyticus Using Corn Steep Liquor as a Unique Source of Nutrients

Abstract

The relevance of this work lies in the fact that it is the first time that corn steep liquor (CSL) has been proposed as a unique source of nutrients for producing biosurfactants in a controlled fermentation and Aneurinibacillus aneurinilyticus, isolated from CSL, has been evaluated for producing extracellular and cell-bound biosurfactants in a controlled fermentation, using secondary raw materials as a source of nutrients. In the present study, A. aneurinilyticus was inoculated into the culture medium containing sterilized CSL solutions (100–400 g L−1) and incubated using different temperatures (20–60 °C) and fermentation times (8–30 days). The dependent variables under study were the concentration of extracellular biosurfactants and cell-bound biosurfactant production in terms of critical micellar concentration (CMC), as well as the C/N ratio for cell-bound biosurfactant extracts. It was observed that CSL could increase the concentration of extracellular biosurfactants produced by A. aneurinilyticus if these were fermented during 19 days at 40 °C, using 250 g L−1 of CSL; a mean value of 6 g L−1 for extracellular biosurfactants and favorable CMC concentrations enabled the detection of cell-bound biosurfactant extracts under these conditions. Hence, these conditions could be considered optimal for producing both extracellular and cell-bound biosurfactants from CSL.

Health and Bioactive Compounds of Fermented Foods and By-Products

“…This Edition featured seven publications (four original research papers and three reviews) covering diverse fermented foods and fermented food by-products as sources of nutrients, health benefits, medicine, and potential biotechnological applications. A special mention should be given to papers focusing on fermentable foods providing nutritional improvements [1][2][3] and multi-health functional activities [3][4][5].…”

“…Lvova et al [2] used secondary raw materials, such as corn steep liquor (CSL), as a unique source of nutrients for producing biosurfactants, a healthier alternative to synthetic ones. The authors applied a controlled fermentation process and Aneurinibacillus aneurinilyticus, isolated from CSL, for producing extracellular and cell-bound biosurfactants in a controlled fermentation procedure.…”