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- W2014990140 abstract "Xylanase was produced by Aspergillus terreus cultivated on finely ground wheat straw in solid-state fermentation. The optimal medium composition was developed by applying the Plackett–Burman experimental design. Best enzymic activity was obtained in a medium containing 10 g wheat straw/flask moistened with a concentrated nutrient salt solution to 75% initial water content and incubated for 4 days at 30°C. A. terreus xylanase was fractionated by ammonium sulfate precipitation and purified by chromatography on DEAE Bio-Gel A followed by gel-filtration on Sephadex G-75. The enzyme was characterized by apparent Vmax and Km values of 333.3 U/mg protein and 16.7 mg xylan/ml, respectively, obtained for xylanase with oat spelt xylan as substrate. The optimal pH and temperature for maximum activity were 7 and 50°C, respectively. The enzyme showed high specificity towards oat spelt xylan and minute activities were observed with carboxymethyl cellulose and cellobiose. About 48.02% of the activity remained after the enzyme had been incubated at 60°C for 30 min. Metal ions such as Hg2+, Cu2+, Co2+, Fe3+, Pb2+ strongly inhibited xylanase, whereas, Ca2+ activated the enzyme." @default.
- W2014990140 created "2016-06-24" @default.
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- W2014990140 date "2000-06-01" @default.
- W2014990140 modified "2023-10-03" @default.
- W2014990140 title "Production of Aspergillus terreus xylanase in solid-state cultures: application of the Plackett–Burman experimental design to evaluate nutritional requirements" @default.
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- W2014990140 doi "https://doi.org/10.1016/s0960-8524(99)00155-8" @default.
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