Chemoenzymatic synthesis of sucuronic acid using D-glucurono-6,3-lactone and sucrose as raw materials, and properties of the product

Publication date: Available online 21 December 2017 Source:Enzyme and Microbial Technology Author(s): Hiroki Hosaka, Saori Mizoguchi, Mitsuru Tashiro, Takashi Fujimoto, Takako Hirano, Wataru Hakamata, Toshiyuki Nishio Using D-glucurono-6,3-lactone (GlcL) and sucrose (Suc) as raw materials, we synthesized sucuronic acid (SucA), in which the D-glucose (Glc) residue of Suc was replaced with D-glucuronic acid, by a three-step chemoenzymatic method. In the 1 st chemical step, methyl D-glucuronate (GlcAM) was synthesized by treating GlcL with a strong base anion exchange resin, Amberlite IRA402BL OH AG, in anhydrous methanol. In the 2nd step, which included an enzyme reaction, methyl sucuronate (SucAM) was synthesized from GlcAM and fructose by exploiting the transfructosylation activity of the Microbacterium saccharophilum K-1 β-fructofuranosidase, a reaction that is suppressed in the presence of high-concentration Glc. In this reaction, the addition of a Suc-non-assimilating yeast, Saccharomyces bisporus NBRC1131, to the reaction mixture increased the amount of SucAM generated, because Glc was removed from the mixture by this yeast. In the 3rd chemical step for producing sodium sucuronate (SucA·Na), SucAM was treated with Amberlite IRA402BL OH AG in water to hydrolyze SucAM’s ester bond, and product was then treated with NaOH. The molar yield of SucA·Na from GlcL was 34.2%. SucA was stable at 37 °C in buffer solutions at pH 3, 5, 7, or 9. However, at temperatur...
Source: Enzyme and Microbial Technology - Category: Biotechnology Source Type: research