Abstract
Potato starch processing waste is causing serious environmental problems. This study aimed to convert potato starch processing waste into single-cell protein as high-quality feed using a two-step fermentation process. The mutant strain Aspergillus niger H3 was selected after UV irradiation and ethyl methyl sulfone mutagenesis for more cellulase production. The activities of sodium carboxymethyl cellulase and filter paperase of strain H3 were 8.86 and 4.79 U, respectively, which were much higher than the parent strain (1.18 and 0.62 U). After treatment with strain H3, the cellulose degradation rate of potato residue was 80.54 %. A liquid fermentation using Bacillus licheniformis was performed as the second step. The optimized fermentation conditions were temperature of 32.8 °C, pH 6.67, and inoculum concentration of 1.78 % using the response surface method. Results of this study showed a potential application in large-scale industrial conversion.
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Abbreviations
- CMCase:
-
Sodium carboxymethyl cellulase
- CMC-Na:
-
Sodium carboxymethyl cellulose
- CP:
-
Crude protein
- CCD:
-
Central composite design
- D:
-
Diameter of the colony
- EMS:
-
Ethyl methyl sulfone
- FPase:
-
Filter paperase
- H:
-
Diameter of the halo
- PDA:
-
Potato dextrose agar
- RSM:
-
Response surface method
- SCP:
-
Single-cell protein
- TP:
-
True protein
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Acknowledgments
The authors wish to thank the Chinese government for the financial support of this study under the National High Technology Research and Development Program 2012AA021404 and Heilongjiang Province Technological Project GA08C201.
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Bingnan Liu and Ying Li have contributed equally to this work.
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Liu, B., Li, Y., Song, J. et al. Production of single-cell protein with two-step fermentation for treatment of potato starch processing waste. Cellulose 21, 3637–3645 (2014). https://doi.org/10.1007/s10570-014-0400-6
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DOI: https://doi.org/10.1007/s10570-014-0400-6