Long-chain isomaltooligosaccharides (IMOs) are promising prebiotics. IMOs were produced by a Weissella confusa dextransucrase via maltose acceptor reaction. The inputs of substrates (i.e., sucrose and maltose, 0.15–1 M) and dextransucrase (1–10 U/g sucrose) were used to control IMO yield and profile. According to response surface modeling, 1 M sucrose and 0.5 M maltose were optimal for the synthesis of longer IMOs, whereas the dextransucrase dosage showed no significant effect. In addition to the principal linear IMOs, a homologous series of minor IMOs were also produced from maltose. As identified by MSn and NMR spectroscopy, the minor trisaccharide contained an α-(1→2)-linked glucosyl residue on the reducing residue of maltose and thus was α-d-glucopyranosyl-(1→2)-[α-d-glucopyranosyl-(1→4)]-d-glucopyranose (centose). The higher members of the series were probably formed by the attachment of a single unit branch to linear IMOs. This is the first report of such α-(1→2)-branched IMOs produced from maltose by a dextransucrase.
- maltose acceptor reaction
- response surface modeling
Shi, Q., Hou, Y., Juvonen, M., Tuomainen, P., Kajala, I., Shukla, S., Goyal, A., Maaheimo, H., Katina, K., & Tenkanen, M. (2016). Optimization of Isomaltooligosaccharide Size Distribution by Acceptor Reaction of Weissella confusa Dextransucrase and Characterization of Novel [alpha]-(1->2)-Branched Isomaltooligosaccharides. Journal of Agricultural and Food Chemistry, 64(16), 3276-3286. https://doi.org/10.1021/acs.jafc.6b01356