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Xylanase production by Aspergillus nigerNRRL‐567 in solid‐state fermentation (koji fermentation) was optimized using 24 factorial design and response surface methodology. The evaluated variables were the initial moisture level and concentration of inducers [veratryl alcohol (VA), copper sulphate (CS), and lactose (LAC)], leading to the response of xylanase production. Initial moisture level and LAC...
Ever-growing demand for citric acid (CA) and urgent need for alternative sources has served as a driving force for workers to search for novel and economical substrates. Submerged fermentation was conducted using apple (Malus domestica) pomace ultrafiltration sludge as an inexpensive substrate for CA bioproduction, using Aspergillus niger NRRL567. The crucial parameters, such as total suspended solids...
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