Optimization of Corn Steep Liquor Dosage and Other Fermentation Parameters for Ethanol Production by Saccharomyces cerevisiae Type 1 and Anchor Instant Yeast

Bioethanol production has seen an increasing trend in research recently, with a focus on increasing its economic viability. The aim of this study is to develop a low-cost fermentation medium with a minimum of redundant nutritional supplements, thereby minimizing the costs associated with nutritional...

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Published inEnergies (Basel) Vol. 11; no. 7; p. 1740
Main Authors Taiwo, Abiola, Madzimbamuto, Tafirenyika, Ojumu, Tunde
Format Journal Article
LanguageEnglish
Published Basel MDPI AG 03.07.2018
Subjects
Agricultural production
Anchors
artificial neural network (ANN)
Baking yeast
Biofuels
Corn
corn steep liquor (CSL)
Dietary supplements
Ethanol
Fermentation
Liquor
Low cost
Neural networks
Optimization
Process parameters
Response surface methodology
response surface methodology (RSM)
Saccharomyces cerevisiae
Viability
Yeast
yeast extract
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Summary:Bioethanol production has seen an increasing trend in research recently, with a focus on increasing its economic viability. The aim of this study is to develop a low-cost fermentation medium with a minimum of redundant nutritional supplements, thereby minimizing the costs associated with nutritional supplements and seed production. Corn steep liquor (CSL) in glucose fermentation by Saccharomyces Type 1 (ST1) strain and Anchor Instant Yeast (AIY), which are low-cost media, is used as a replacement for yeast extract (YE). The fermentation process parameters were optimized using artificial neural networks (ANN) and the response surface method (RSM). The study shows that for CSL, maximum average ethanol concentrations of 41.92 and 45.16 g/L, representing 82% and 88% of the theoretical yield, were obtained after 36 h of fermentation in a shake flask for ST1 and AIY, respectively. For YE, ethanol concentrations equivalent to 86% and 88% of theoretical yield were obtained with ST1 and AIY, respectively after 48 h. Although ANN better predicted the responses compared to RSM, optimum conditions were better predicted by RSM. This study shows that corn steep liquor is an inexpensive potential nutrient that may have significant cost implications for commercial ethanol production.
ISSN:1996-1073
1996-1073
DOI:10.3390/en11071740