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Lactic acid production from dining‐hall food waste by Lactobacillus plantarum using response surface methodology
Author(s) -
Ye ZhiLong,
Lu Min,
Zheng Yan,
Li YaHong,
Cai WeiMin
Publication year - 2008
Publication title -
journal of chemical technology and biotechnology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.64
H-Index - 117
eISSN - 1097-4660
pISSN - 0268-2575
DOI - 10.1002/jctb.1968
Subject(s) - lactic acid , food waste , fermentation , food science , amylase , lactobacillus plantarum , chemistry , response surface methodology , lactic acid fermentation , starch , protease , substrate (aquarium) , lactobacillus , bacteria , biochemistry , biology , enzyme , chromatography , ecology , genetics
BACKGROUND: Food waste generally has a high starch content and is rich in nutritional compounds, including lipids and proteins. It therefore represents a potential renewable resource. In this study, dining‐hall food waste was used as a substrate for lactic acid production, and response surface methodology was employed to optimise the fermentation conditions. RESULTS: Lactic acid biosynthesis was significantly affected by the interaction of protease and temperature. Protease, temperature and CaCO 3 had significant linear effects on lactic acid production, while α‐amylase and yeast extract had insignificant effects. The optimal conditions were found to be an α‐amylase activity of 13.86 U g −1 dried food waste, a protease activity of 2.12 U g −1 dried food waste, a temperature of 29.31 °C and a CaCO 3 concentration of 62.67 g L −1 , which resulted in a maximum lactic acid concentration of 98.51 g L −1 (88.75% yield). An increase in inoculum size would be appropriate for accelerating the depletion of initial soluble carbohydrate to enhance the efficiency of α‐amylase in dining‐hall food waste fermentation. CONCLUSION: A suitable regression model for lactic acid production was developed based on the experimental results. Dining‐hall food waste was found to be a good substrate for lactic acid fermentation with high product yield and without nutrient supplementation. Copyright © 2008 Society of Chemical Industry