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Carbohydrates are an essential part of the diet in humans and animals. Grains, fruits, and vegetables are natural sources of carbohydrates that provide energy to the body, particularly through glucose, a simple sugar that is a component of starch and an ingredient in many staple foods. The stoichiometric formula (CH2O)n, where n is the number of carbons in the molecule represents carbohydrates. In other words, the ratio of carbon to hydrogen to oxygen is 1:2:1 in carbohydrate molecules. This...
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Polysaccharides such as glycogen and starch are synthesized from nucleoside diphosphate sugars, primarily uridine diphosphate glucose (UDPG) and adenosine diphosphate glucose (ADPG). These activated glucose donors act as key intermediates in carbohydrate metabolism and biosynthesis. UDPG primarily involves glycogen synthesis in animals and many bacteria, while ADPG plays a fundamental role in starch synthesis in plants and certain bacteria.UDPG is formed when glucose-1-phosphate reacts with...
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Carbohydrate digestion and metabolism break down simple and complex carbohydrates from food into saccharides (i.e., sugars) for the body to use as energy. Carbohydrate digestion starts in the mouth during mastication, or chewing. The masticated carbohydrates remain intact in the stomach. Digestion resumes in the duodenum of the small intestine, where pancreatic alpha-amylase and brush border enzymes of the microvilli convert complex carbohydrates to monosaccharides. Finally, the monosaccharides...
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Carbohydrate stabilization extends the kinetic limits of chemical polysaccharide depolymerization.

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This study introduces a formaldehyde-based method to stabilize sugars during lignocellulosic biomass depolymerization. This approach significantly enhances carbohydrate yields by preventing degradation, overcoming previous kinetic limitations.

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Area of Science:

  • Biomass Valorization
  • Carbohydrate Chemistry
  • Green Chemistry

Background:

  • Polysaccharide depolymerization is crucial for lignocellulosic biomass valorization.
  • Current methods are limited by low sugar yields due to carbohydrate degradation at accessible temperatures.
  • Degradation rates of carbohydrate monomers often exceed depolymerization rates, hindering efficient sugar recovery.

Purpose of the Study:

  • To develop a novel strategy for enhancing polysaccharide depolymerization yields.
  • To overcome the kinetic limitations of sugar degradation during biomass processing.
  • To enable high-yield recovery of biomass-derived carbohydrates.

Main Methods:

  • Utilizing reversible acetal formation with formaldehyde to stabilize xylose and glucose.
  • Employing a harsh organosolv pretreatment in the presence of formaldehyde.
  • Analyzing the depolymerization of xylan and cellulose under varying conditions.

Main Results:

  • Over 90% xylan recovery as diformylxylose from beech wood using formaldehyde, compared to 16% without.
  • Carbohydrate yields exceeding 70% with a final concentration of ~5 wt% after cellulose depolymerization.
  • Significant improvement in sugar yields compared to processes without formaldehyde stabilization.

Conclusions:

  • Formaldehyde-mediated acetal formation effectively stabilizes sugars, preventing degradation.
  • This strategy overcomes longstanding kinetic barriers in polysaccharide depolymerization.
  • High yields and concentrations of biomass-derived carbohydrates are achievable.