Abstract
The hydrolysis of disaccharides was conducted using a microcapillary system under hydrothermal conditions (up to 190°C at 10 MPa and pH 4–11). The hydrolysis reaction showed a sigmoidal progression with time, especially under alkaline conditions. Analysis using a kinetic model yielded the reaction induction period. The specific pH value (pHamb) at the induction time, which is the pH value corresponding to the progression of disaccharide hydrolysis, was peculiar to each disaccharide. Finally, the calculation of the electron density around the oxygen atom of the glycosidic bond between saccharides was found to roughly predict the pHamb value required for the progression of hydrolysis.
Highlights
Sugar production is an indispensable technology in food and chemical engineering
Because cellulose is present in plant biomass [1], it is a useful resource for the preparation of sugars and other value-added materials. e hydrolysis of cellulose is, in principle, based on the cleavage of the glycosidic bond between monosaccharides and requires acidic conditions [8]
We selected disaccharides as the target materials because the minimum unit process in cellulose hydrolysis is considered to be the hydrolysis of disaccharides. en, we examined the hydrolysis behavior of disaccharides at various pHs and temperatures
Summary
Many researchers have reported that cellulose and oligo- and disaccharides are hydrolyzed to monosaccharides [1,2,3,4,5,6,7]. Because cellulose is present in plant biomass [1], it is a useful resource for the preparation of sugars and other value-added materials. E hydrolysis of cellulose is, in principle, based on the cleavage of the glycosidic bond between monosaccharides and requires acidic conditions [8]. A variety of methods including the use of metal catalysts, enzymatic treatment in ionic liquids [9,10,11], and hydrothermal treatment [1,2,3, 6, 7] have been reported to improve hydrolysis. Enzymes and ionic liquids are expensive. us, the hydrolysis of sugar is not always an environmentally benign process and can be economically risky
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