Results
Title

Production of keto-disaccharides from aldo-disaccharides in subcritical aqueous ethanol.

Authors

Gao, Da-Ming; Kobayashi, Takashi; Adachi, Shuji

Abstract

Isomerization of disaccharides (maltose, isomaltose, cellobiose, lactose, melibiose, palatinose, sucrose, and trehalose) was investigated in subcritical aqueous ethanol. A marked increase in the isomerization of aldo-disaccharides to keto-disaccharides was noted and their hydrolytic reactions were suppressed with increasing ethanol concentration. Under any study condition, the maximum yield of keto-disaccharides produced from aldo-disaccharides linked byβ-glycosidic bond was higher than that produced from aldo-disaccharides linked byα-glycosidic bond. Palatinose, a keto-disaccharide, mainly underwent decomposition rather than isomerization in subcritical water and subcritical aqueous ethanol. No isomerization was noted for the non-reducing disaccharides trehalose and sucrose. The rate constant of maltose to maltulose isomerization almost doubled by changing solvent from subcritical water to 80 wt% aqueous ethanol at 220 °C. Increased maltose monohydrate concentration in feed decreased the conversion of maltose and the maximum yield of maltulose, but increased the productivity of maltulose. The maximum productivity of maltulose wasca. 41 g/(h kg-solution). Promoted production of keto-disaccharides from aldo-disaccharides in subcritical aqueous ethanol.

Subjects

DISACCHARIDES; ISOMERIZATION; ETHANOL

Publication

Bioscience, Biotechnology & Biochemistry, 2016, Vol 80, Issue 5, p998

ISSN

0916-8451

Publication type

Academic Journal

DOI

10.1080/09168451.2015.1127135