Noncatalytic hydrolysis of guar gum under hydrothermal conditions

Carbohydrate Research
Tetsuya Miyazawa, Toshitaka Funazukuri

Abstract

Guar gum, a naturally occurring heteropolysaccharide made of mannose and galactose, was hydrolytically degraded without a catalyst in a batch reactor to produce water-soluble (WS) saccharides including mono- and oligosaccharides. The degradation was carried out under hydrothermal conditions over ranges of temperature from 180 to 240 degrees C and of reaction time from 3 to 60min. Guar gum was readily dissolved and hydrolyzed, and the major products identified in the WS components were oligosaccharides with degrees of polymerization up to about 20, monosaccharides containing mannose and galactose, and 5-hydroxymethyl-2-furaldehyde (5-HMF). At 200 degrees C, the oligosaccharide yield, obtained from the difference between the yields of the total WS saccharides and monosaccharides, showed the highest value of 94.4% at 7min among all conditions studied, on the basis of the saccharide content in the initial sample. The oligosaccharide yield decreased with reaction time, and the yield of monosaccharides correspondingly increased, and reached the highest value of 34.5% (mannose 22.8%, galactose 11.7%) at 60min. The monosaccharides produced were further decomposed to secondary products such as 5-HMF. The maximum yield of 5-HMF obtained ...Continue Reading

References

Feb 18, 2004·Mass Spectrometry Reviews·Joseph Zaia

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Citations

Dec 24, 2013·Carbohydrate Research·Minoru MorimotoHiroyuki Saimoto
Jun 15, 2007·Journal of Zhejiang University. Science. B·Qing XuXiu-Yang Lü
Oct 21, 2016·Critical Reviews in Food Science and Nutrition·Tanushree MaityP S Raju
Aug 1, 2015·International Journal of Toxicology·Wilbur JohnsonF Alan Andersen
May 6, 2019·Preparative Biochemistry & Biotechnology·Latika BhatiaAnuj K Chandel

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