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• W2012607311 abstract "β-Glucosylglycerol (βGG) has potential applications as a moisturizing agent in cosmetic products. A stereochemically selective method of its synthesis is kinetically controlled enzymatic transglucosylation from a suitable donor substrate to glycerol as acceptor. Here, the thermostable β-glycosidase CelB from Pyrococcus furiosus was used to develop a microstructured immobilized enzyme reactor for production of βGG under conditions of continuous flow at 70°C. Using CelB covalently attached onto coated microchannel walls to give an effective enzyme activity of 30 U per total reactor working volume of 25 µL, substrate conversion and formation of transglucosylation product was monitored in dependence of glucosyl donor (2-nitrophenyl-β-D-glucoside (oNPGlc), 3.0 or 15 mM; cellobiose, 250 mM), the concentration of glycerol (0.25–1.0 M), and the average residence time (0.2–90 s). Glycerol caused a concentration-dependent decrease in the conversion of the glucosyl donor via hydrolysis and strongly suppressed participation of the substrate in the reaction as glucosyl acceptor. The yields of βGG were ≥80% and ≈60% based on oNPGlc and cellobiose converted, respectively, and maintained up to near exhaustion of substrate (≥80%), giving about 120 mM (30 g/L) of βGG from the reaction of cellobiose and 1 M glycerol. The structure of the transglucosylation products, 1-O-β-D-glucopyranosyl-rac-glycerol (79%) and 2-O-β-D-glucopyranosyl-sn-glycerol (21%), was derived from NMR analysis of the product mixture of cellobiose conversion. The microstructured reactor showed conversion characteristics similar to those for a batchwise operated stirred reactor employing soluble CelB. The advantage of miniaturization to the microfluidic format lies in the fast characterization of full reaction time courses for a range of process conditions using only a minimum amount of enzyme. Biotechnol. Bioeng. 2009;103: 865–872. © 2009 Wiley Periodicals, Inc." @default.
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• W2012607311 date "2009-08-01" @default.
• W2012607311 modified "2023-10-16" @default.
• W2012607311 title "Enzymatic synthesis of β-glucosylglycerol using a continuous-flow microreactor containing thermostable β-glycoside hydrolase CelB immobilized on coated microchannel walls" @default.
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• W2012607311 doi "https://doi.org/10.1002/bit.22317" @default.
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