Efficient and green production of manno-oligosaccharides from Gleditsia microphylla galactomannans using CO2 and solid acid in subcritical water

• DOI: 10.1016/j.lwt.2021.113019
• Publication Date: 2021-12-26T10:28:59Z
• Authors: Wei Xu; Minghui Han; Weiwei Zhang; Meng Tang; Fenglun Zhang; Jianxin Jiang
• Keywords: Solid acid; Galactomannan; Environmentally Friendly

This study aimed to produce manno-oligosaccharides (MOS) from Gleditsia microphylla galactomannans (GMG) using CO2 and solid acid (Amberlyst-35) in subcritical water. The optimal condition for MOS preparation was 3 MPa CO2, 0.1 g/g (relative GMG) at 150 °C 40 min. maximum yield with a degree of polymerization 2 4 (M2-M4) 52.19%, which doubled the compared either solely or acid. Solid showed excellent performance producing under H2O–CO2 condition, due enhanced mass transfer efficiency increased H+ concentration reaction system. can be easily separated reused. Comparing traditional methods used MOS, this approach has many merits such as higher galactomannan hydrolysis (largely reduced time yield), purer M2-M4 product, lower costs, more environmental-friendly.