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- W2365788914 abstract "Four components of xylanases were separated and purified by using exclusion chromatography and ion-exchange chromatography and other purification methods from the Aspergillus aculeatus SM-L22 The molecular weights of each components were characterized by SDS-PAGE, and were 92 13 kD,32 4 kD,42 4 kD,27 03 kD, respectively. The optimal pHs for the four xylanases were 5 0, 4 0, 4 6 and 3～3 5 respectively, and all four were stable in acidic or neutral condition. The optimum temperatures for Xy-1 and Xy-2 were the same to be 75℃, and they showed good stability at 50℃. Xy-3 and Xy-4 had lower optimum temperatures being 55℃, and they were stable only below 40℃. The K m values of Xy-1, Xy-2, Xy-3 and Xy-4 were 0 36%, 0 26%, 2 46% and 13 9% respectively, when the xylan from beachwood was as substrate, and the V max values of these activities were 4 01μmol/min/mg, 8 81μmol/min/mg, 81 97μmol/min/mg, 4 71μmol/min/mg, respectively. The activity of each component can be strongly inhibited by Cu 2+ and Ag +. The activities of Xy-3 can be increased dramatically by Mg 2+, Ba 2+, Ca 2+. The activity of Xy-4 can also be increased by Ca 2+." @default.
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- W2365788914 date "2004-11-02" @default.
- W2365788914 modified "2023-09-27" @default.
- W2365788914 title "Purification and Properties of Xylanases from Aspergillus aculeatus SM-L221" @default.
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