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- W4229020616 abstract "Rebaudioside D (RD) is a natural low-calorie, high-sweet sweetener and an excellent sugar substitute. In this study, RD was produced by coupling glucosyltransferase (EUGT11) and sucrose synthase (SUS) with a novel strategy of immobilization to enhance the recyclability of enzymes and decrease the production costs of RD. Recombinant EUGT11 from Oryza sativa and SUS from Arabidopsis thaliana were expressed in Escherichia coli and immobilized onto Fe 3 O 4 @Uio-66 nanocomposite. The results of Fourier transform Infrared spectra (FT-IR), X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission electron microscopy (TEM), magnetic susceptibility (VSM), thermogravimetric (TG) analysis and Brunauer–Emmett–Teller (BET) indicated that the magnetic nanocomposite Fe 3 O 4 @Uio-66 was successfully fabricated and the two enzymes were separately immobilized on Fe 3 O 4 @Uio-66. The reusability, storage, pH and temperature stabilities of the immobilized enzymes were investigated and compared to that of free enzymes. It was more stable towards temperature compared with free enzyme. The kinetic properties of immobilized EUGT11 showed a lower V m and a higher K m compared to free EUGT11, and immobilized SUS showed a lower V m and K m compared to free SUS. The immobilized SUS had around 56% residual activity upon storage a period of 10 days at 4 °C. After 8 times, the catalytic activity of immobilized double enzyme still retained around 80%, which showed a desirable stability and reduced the overall cost of enzymes, indicating that the immobilized enzymes had a good industrial application prospect in RD production. • Double-enzyme biocatalyst of glucosyltransferase and sucrose synthase was prepared. • Glucosyltransferase and sucrose synthase were first immobilized on Fe 3 O 4 @Uio-66. • The thermostability of enzyme was improved by immobilization. • The activity of immobilized double enzyme was maintained at 80% after 8 times of recycling." @default.
- W4229020616 created "2022-05-08" @default.
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- W4229020616 date "2022-07-01" @default.
- W4229020616 modified "2023-09-30" @default.
- W4229020616 title "Immobilized glucosyltransferase and sucrose synthase on Fe3O4@Uio-66 in cascade catalysis for the one-pot conversion of rebaudioside D from rebaudioside A" @default.
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- W4229020616 doi "https://doi.org/10.1016/j.procbio.2022.05.004" @default.
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