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Production of feed enzymes from citrus processing waste by solid‐state fermentation with Eupenicillium javanicum
Author(s) -
Tao Nengguo,
Shi Wenqing,
Liu Yuejin,
Huang Shirong
Publication year - 2011
Publication title -
international journal of food science and technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.831
H-Index - 96
eISSN - 1365-2621
pISSN - 0950-5423
DOI - 10.1111/j.1365-2621.2011.02587.x
Subject(s) - xylanase , bran , solid state fermentation , chemistry , food science , cellulase , pectinase , fermentation , moisture , orange (colour) , raw material , enzyme , biochemistry , organic chemistry
Summary Bingtang sweet orange processing waste was utilised to produce four feed enzymes (Endoglucanase, β‐glucosidase, pectinase and xylanase) by the solid‐state fermentation (SSF) with Eupenicillium javanicum . The factors related with SSF including moisture content, temperature, initial pH, time, carbon source (0.5 g), nitrogen sources (0.05 g), inorganic mineral salts (0.1 g) were investigated separately. The corresponding optimal condition was: moisture content 80% (w/w), temperature 30 °C, natural pH, time 96 h, wheat bran 0.5 g, (NH 4 ) 2 SO 4 0.05 g or NaNO 3 0.05 g, CaCl 2 0.1 g. The L 9 (3 4 ) orthogonal experiment results showed that the optimal condition for producing above multiple enzymes was: moisture content 80% (w/w), temperature 30 °C, wheat bran 1 g, (NH 4 ) 2 SO 4 0.05 g, NaNO 3 0.05 g, CaCl 2 0.1 g, fermentation time 96 h and natural pH. Under this condition, the average activity of Endoglucanase (CMCase), β‐glucosidase, pectinase and xylanase by E. javanicum could reach 46.80, 49.64, 51.87 and 106.42 U g −1 , respectively, which was significantly higher than those in single factor experiments. Our present results demonstrated that E. javanicum could also be an effective and useful fungus for multienzyme preparation especially for β‐glucosidase and xylanase from citrus processing wastes.