It was found that a β-fructofuranosidase produced by Microbacterium sp. H-1 has potent trans-β-fructofuranosylation activity from sucrose (donor). By means of this enzyme system, rebaudioside A (RA), the second major sweet steviol glycoside of the leaves of Stevia rebaudiana, was subjected to transfructosylation, affording a mono-β-fructofuranosylated product (RA-F) in a high yield. The structure of RA-F was elucidated as β-D-fructofuranosyl-(2→6)-β-D-glucopyranosyl ester of steviol-13-O-[β-D-glucopyranosyl-(1→2)]-[β-D-glucopyranosyl-(1→3)]-β-D-glucopyranoside. Some improvement in the quality of sweetness was observed for RA-F.
发现微杆菌产生的β-呋喃果糖苷酶。 H-1 具有来自蔗糖(供体)的有效反式-β-呋喃果糖基化活性。通过该酶系统,甜叶菊叶中第二大甜甜菊糖苷莱鲍迪苷 A (RA) 进行转果糖基化,以高产率提供单-β-呋喃果糖基化产物 (RA-F)。 RA-F的结构被阐明为甜菊醇-13-O-[β-D-吡喃葡萄糖基-(1→2)]-[β的β-D-呋喃果糖基-(2→6)-β-D-吡喃葡萄糖酯-D-吡喃葡萄糖基-(1→3)]-β-D-吡喃葡萄糖苷。观察到 RA-F 的甜味品质有所改善。