Study on the synthesis of sucrose-6-acetate catalyzed by fructosyltransferase from Aspergillus oryzae.

The study had mainly investigated the synthesis of sucrose-6-acetate (s-6-a) in fructosyltransferase action. The synthesis reaction of s-6-a was performed between sucrose and glucose-6-acetate (g-6-a), and identified by high performance liquid chromatography (HPLC). According to the reaction of s-6-a catalyzed by fructosyltransferase from Aspergillus oryzae, the effect factors of reaction, such as the ratio of g-6-a to sucrose, temperature, time, pH, substrate and enzyme concentration in the reaction, were investigated. All results indicated that the fructosyltransferase could catalyze the s-6-a synthesis, and the optimal conditions of fructosyltransferase in reaction were 50°C, pH 6.2, 48h reaction time, 60% sucrose, 1:3 ratio of g-6-a to sucrose and 4.0mg/L concentration of enzyme. This study plays the important role in sucralose synthesis, because it is very cumbersome in the reported methods.