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[en] The application of sucrose synthase as a valuable biocatalyst for the synthesis of activated sugars and saccharides requires large amounts of enzyme. The purification of sucrose synthase starting from the 9 kg scale of rice (Oryza sativa) grains was achieved in five steps with 11.3% yield and 192-fold purification. The final sucrose synthase preparation was free of nucleotide di- and monophosphatases, but did contain 0.05% of both invertase and UDP-glucose-hydrolysing activity. It can be efficiently utilized for the synthesis of activated sugars. Its application for the synthesis of saccharides is possible taking into account that 15% UDP-glucose is hydrolysed within 15 h incubation time
