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- W2366574081 abstract "Screening out a novel Aspergillus niger strain (A-828) which expresses high active acid phytase through combination mutation by Co-60 and UV. To research its enzymatic characterization, the acid phytase was purified by the steps of ultrafiltration and Bio-gel-P-150 chromatography. The purification ratio and yield was 11.2 and 29%. Result shows that its molecular weight was estimated to be about 66kDa by SDS-PAGE. The phytase activity of A-828 reached to the 66,000U/mL, 17 fold than origin. Its optimum pH of the enzyme activity was both at 2.5 and 5.5, but the largest activity at 2.5 was 5 fold than that at 5.5. Its optimum temperature was 55℃. The thermal stability of the phytase could be unchanged during 20℃ to 60℃ for 20 min. The phytase activity was strongly inhibited by 2mmol/L Cu2+ , Fe2+ and Cr2+, while could not be influence by Ca2+, Mn2+, EDTA, DTT." @default.
- W2366574081 created "2016-06-24" @default.
- W2366574081 creator A5072751960 @default.
- W2366574081 date "2009-01-01" @default.
- W2366574081 modified "2023-09-22" @default.
- W2366574081 title "The biological synthesis,purification and characterization of an acid phytase from Aspergillus niger A-828" @default.
- W2366574081 hasPublicationYear "2009" @default.
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