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- W2013544656 abstract "Synthesis of lactulose under repeated-batch operation was done with cross-linked aggregates of Aspergillus oryzae β-galactosidase (CLAGs). The effect of the crosslinking agent to enzyme mass ratio and cross-linking time were first evaluated. Best results were obtained at 5.5gdeglutaraldehyde/g enzyme at 5h of cross-linking, obtaining a specific activity of 15,000IUg(-1), with 30% immobilization yield. CLAG was more stable than the free enzyme under non-reactive conditions with a half-life of 123h at 50°C and when operated in repeated-batch mode, yield and productivity was 3.8 and 4.3 times higher. Maximum number of batches was determined considering biocatalyst replacement at 50% residual activity. 98 and 27 batches could be performed under such criterion at fructose/lactose molar ratio of 4 and 20 respectively, reflecting that enzyme stability is strongly affected by the sugars distribution in the reaction medium." @default.
- W2013544656 created "2016-06-24" @default.
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- W2013544656 date "2015-08-01" @default.
- W2013544656 modified "2023-10-16" @default.
- W2013544656 title "Repeated-batch operation for the synthesis of lactulose with β-galactosidase immobilized by aggregation and crosslinking" @default.
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- W2013544656 doi "https://doi.org/10.1016/j.biortech.2015.04.039" @default.
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