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• W1720062341 abstract "A cellulolytic enzyme was isolated from a commercial cellulase preparation form Aspergillus niger. A yield of about 50mg of enzyme was obtained per 100g of commerial cellulase. The isolated enzyme was homogeneous in the ultracentrifuge at pH 4.0 and 8.0, and in sodium dodecyl sulphate/polyacrylamide-gel electrophoresis but showed one major and two minor bands in disc gel electrophoresis. No carbohydrate was associated with the protein. Amino acid analysis revealed that the enzyme was rich in acidic and aromatic amino acids. Data from the amino acid composition and dodecyl sulphate/polyacrylamide-gel electrophoresis indicated a molecular weight of 26000. The purified enzyme was active towards CM-cellulose, but no activity towards either cellobiose or p-nitrophenyl beta-D-glucoside was detected under the assay conditions used. The pH optimum for the enzyme was pH 3.8-4.0, and it was stable at 25 degrees C over the range pH 1-9; maximum activity (at pH 4.0) was obtained at 45 degrees C. The cellulase was more stable to heat treatment at pH 8.0 than at 4.0. Kinetic studies gave pK values between 4.2 and 5.3 for groups involved in the enzyme-substrate complex." @default.
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• W1720062341 date "1977-07-01" @default.
• W1720062341 modified "2023-09-27" @default.
• W1720062341 title "Purification and properties of a cellulase from <i>Aspergillus niger</i>" @default.
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• W1720062341 doi "https://doi.org/10.1042/bj1650033" @default.
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