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Korean Journal of Chemical Engineering, Vol.28, No.4, 1096-1100, 2011
Enhancement of glucose isomerase activity by pretreatment with substrates prior to immobilization
To improve the activity of covalently immobilized glucose isomerase, the effects of glucose isomerase pretreatment with D-glucose or D-xylose prior to immobilization were investigated. Glucose isomerase was pretreated with D-glucose or D-xylose to prevent loss of activity, followed by immobilization on a silica gel surface. Pretreated immobilized glucose isomerase (PIGI) with 2.0M D-xylose (194.0 U/g matrix) had higher activity than PIGIs with D-glucose. The optimal temperature, reaction time, and agitation speed for glucose isomerase pretreatment were 60℃ ,45 min, and 200 rpm, respectively. Consequently, the activity of PIGI with D-xylose was 254.9 U/g matrix, which is about 2.5 times higher than that of non-pretreated immobilized glucose isomerase (non-PIGI). PIGI also showed better reusability than non-PIGI, with 75.2% of its original activity being retained after 10 reuses.
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- Song YS, Suh YJ, Park C, Kim SW, Korean Journal of Chemical Engineering, 30(1), 160, 2013
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