Abstract
In this study, Streptococcus thermophilus and Lactobacillus bulgaricus were used to produce l(+)-lactic acid by simultaneous saccharification and fermentation (SSF). The use of hydrolyzed yeast as cheap nutrients and mixtures of cellulosic materials and starchy materials as carbon source for l(+)-LA production was evaluated. Heat treatment (121 °C) was proven to be an effective method to improve the performances of yeast as nutrients for the fermentations using different carbon sources. The addition of yeast hydrolyzate obviously lowered the surface tension of medium and improved enzyme hydrolysis of furfural residue (FR) as the concentration was beyond 10 g/L. Carbon–nitrogen ratio, substrates composition, substrates feeding rate and enzyme-feeding strategy will affect the productivity of l(+)-LA production from mixed substrates. SSF of FR and corn saccharification liquid tends to obtain good yields, when the total WIS content is in 10 % and carbon–nitrogen ratio is about 30. This study provides an encouraging means of producing l(+)-LA from lignocellulosic resource and starchy resource, which could optimize the use of raw materials.
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Abbreviations
- SSF:
-
Simultaneous saccharification and fermentation
- FR:
-
Water-rinsed furfural residue
- CR:
-
Corn saccharification liquid
- YH:
-
Yeast hydrolyzate
- LA:
-
Lactic acid
- LAB:
-
Lactic acid bacteria
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Acknowledgments
The authors are grateful for the financial support of this research from the Fundamental Research Funds for the Central Universities (BLYJ201212), National Science Foundation of China (31070510) and Major State Basic Research Projects of China (973-2010CB732204).
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Tang, Y., Bu, L., He, J. et al. l(+)-Lactic acid production from furfural residues and corn kernels with treated yeast as nutrients. Eur Food Res Technol 236, 365–371 (2013). https://doi.org/10.1007/s00217-012-1865-x
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DOI: https://doi.org/10.1007/s00217-012-1865-x