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Abstract: This study investigated the effect of carbon sources and their concentrations on the production of xylanase by the edible mushroom Flamulina velutipes. Xylanase activity was checked using oat spelt xylan as a substrate and the reducing group was detected by the dinitrosalicylic acid assay method. Eight different carbon sources (rice husk, wood straw, glucose, sucrose, starch, xylose and xylan) were used in the range of 0.2, 0.4 and 0.6%. Among the carbon sources used, the maximum xylanase production was recorded 5.3 IU/ml when 0.6% xylose was incorporated in the fermentation medium.
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