Production of tagatose and talose through isomerization of galactose in a buffer solution under subcritical water conditions

Galactose was isomerized in pure water or in 10 mmol/L sodium phosphate buffer at 160 °C under pressurized conditions. The isomerization of galactose to tagatose and talose in phosphate buffer resulted in 14% and 1.4% yields, respectively, which were significantly higher than those obtained in subcr...

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Bibliographic Details
Published in:Carbohydrate research 2020-07, Vol.493, p.108031-108031, Article 108031
Main Authors: Onishi, Yuichiro, Furushiro, Yuya, Hirayama, Yusuke, Adachi, Shuji, Kobayashi, Takashi
Format: Article
Language:English
Subjects:
Buffer
Carbohydrate Conformation
Galactose
Galactose - chemistry
Hexoses - chemical synthesis
Hexoses - chemistry
Hydrogen-Ion Concentration
Isomerization
Lactones - chemical synthesis
Lactones - chemistry
Phosphates - chemistry
Rare sugar
Solutions
Stereoisomerism
Subcritical water
Temperature
Water - chemistry
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Summary:Galactose was isomerized in pure water or in 10 mmol/L sodium phosphate buffer at 160 °C under pressurized conditions. The isomerization of galactose to tagatose and talose in phosphate buffer resulted in 14% and 1.4% yields, respectively, which were significantly higher than those obtained in subcritical pure water (0.6% and 6.3. Our results indicate that the galactose isomerization by Lobry de Bruyn-Alberda-van Ekenstein transformation rarely occurred at low pH due to the formation of organic acids. [Display omitted] •Galactose isomerized efficiently in a subcritical buffer solution.•Tagatose and talose were obtained in high yield.•Type of the buffer affected the isomerization.•PH of the solution affected the yield of rare sugars.
ISSN:0008-6215
1873-426X
DOI:10.1016/j.carres.2020.108031