Efficient Extraction and Structural Characterization of Hemicellulose from Sugarcane Bagasse Pith

Area of Science:

• Biomass valorization
• Green chemistry
• Polysaccharide chemistry

Background:

• Sugarcane bagasse pith is a lignocellulosic byproduct with potential for hemicellulose extraction.
• Traditional extraction methods can be inefficient and environmentally taxing.
• Hemicellulose is a valuable polysaccharide with diverse industrial applications.

Purpose of the Study:

• To optimize ultrasound-assisted alkaline extraction of hemicellulose from sugarcane bagasse pith.
• To characterize the structural properties of the extracted hemicellulose.
• To evaluate the efficiency of the ultrasound-assisted method compared to conventional techniques.

Main Methods:

• Response surface methodology (RSM) for optimizing extraction parameters (time, KOH concentration, temperature).
• Fourier transform infrared (FT-IR) spectroscopy for structural analysis.
• Ion chromatography (IC) and gel permeation chromatography (GPC) for monosaccharide composition and molecular weight determination.

Main Results:

• Optimal extraction conditions yielded 23.05% hemicellulose, a 3.24% increase over non-ultrasound methods.
• Xylose was the dominant monosaccharide in both water-soluble (WH) and alkali-soluble (AH) hemicellulose fractions.
• WH exhibited higher non-xylose monosaccharide and uronic acid content, but a lower molecular weight (29923 g/mol) compared to AH (74872 g/mol).

Conclusions:

• Ultrasound-assisted alkaline extraction is an effective and efficient method for obtaining hemicellulose from sugarcane bagasse pith.
• The optimized process significantly improves hemicellulose yield.
• Characterization reveals distinct properties of WH and AH fractions, highlighting their potential for different applications.