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Several di- and oligosaccharides containing a d-fructose moiety have been acylated by protease subtilisin in anhydrous dimethylformamide in the presence of the activated ester trifluoroethyl butanoate. Under the reaction conditions used, all the substrates were converted into the corresponding monobutanoates in ca. 50% isolated yields. Structural determination of the products by 13 C...
The influence of various organic cosolvents on the stability and activity of the β-1,4-galactosyltransferase from bovine colostrum (GalT) and of its ancillary enzyme UDP-galactose-4'-epimerase has been investigated using the glucosylated alkaloid colchicoside (1) as a model substrate. It has been found that some cosolvents, such as Me 2 SO and MeOH, can be used up to 20% v/v without any influence...
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