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Role of the pectinolytic enzyme in the lactic acid fermentation of potato pulp by Rhizopus oryzae

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Journal of Industrial Microbiology and Biotechnology

Abstract.

Rhizopus oryzae strain NBRC 4707 produced lactic acid and ethanol more efficiently than strain NRRL 395 in potato pulp, an agricultural by-product of the starch industry. The two strains developed comparable activities of xylanase, cellulase, α-amylase, and glucoamylase, while the polygalacturonase activity of strain NBRC 4707 was double that of strain NRRL 395. The addition of commercial pectinase enhanced the formation of metabolites, suggesting that the degradation of pectic substances determines the fermentation of potato pulp by R. oryzae. Orange and apple peel were more effective in the induction of polygalacturonase activity than potato pulp, sugarbeet pulp, or wheat bran when used as a principal carbon source for fungal growth in a solid-state culture. The fungal cells in both types of fruit peel stimulated the fermentation of potato pulp and increased the quantity of lactic acid and ethanol to higher levels than those in other agricultural by-products.

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Acknowledgement.

This work was partially supported by the Special Coordination Funds for Promoting Science and Technology (Leading Research Utilizing Potential of Regional Science and Technology) of the Japanese Ministry of Education, Culture, Sports, Science, and Technology.

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Correspondence to Y. Oda.

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Saito, K., Kawamura, Y. & Oda, Y. Role of the pectinolytic enzyme in the lactic acid fermentation of potato pulp by Rhizopus oryzae . J IND MICROBIOL BIOTECHNOL 30, 440–444 (2003). https://doi.org/10.1007/s10295-003-0071-z

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  • DOI: https://doi.org/10.1007/s10295-003-0071-z

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