A method for efficiently extracting hemicellulose from brewer's malt and selectively hydrolyzing it to prepare pentose.

By optimizing a two-stage process of ultrasound-assisted alkaline extraction and dilute acid hydrolysis, hemicellulose was efficiently extracted from beer malt and selectively hydrolyzed to prepare pentose. This solved the problems of low extraction efficiency and poor selectivity in existing technologies, achieving high yield and low by-product generation, making it suitable for industrial applications.

CN122303499APending Publication Date: 2026-06-30XIAMEN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
XIAMEN UNIV
Filing Date
2026-04-01
Publication Date
2026-06-30

AI Technical Summary

Technical Problem

Existing technologies for extracting hemicellulose from brewer's grains are inefficient, have poor hydrolysis selectivity, and generate many byproducts, which limits their prospects for industrial application.

Method used

A two-stage process combining ultrasound-assisted alkaline extraction of hemicellulose with dilute acid hydrolysis was adopted. Key process parameters, including alkali concentration, solid-liquid ratio, temperature, and time, were optimized to achieve efficient extraction and selective hydrolysis of hemicellulose.

Benefits of technology

It significantly improves the extraction rate of hemicellulose and the yield of pentose, reduces the generation of by-products, and forms a coherent and complete integrated process that is suitable for industrial implementation.

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Abstract

A method for efficiently extracting hemicellulose from brewer's spent grains and selectively hydrolyzing it to prepare pentoses is disclosed, relating to the comprehensive utilization of biomass resources and the food chemical industry. 1) Alkaline extraction: The spent grains are mixed with NaOH solution, ultrasonically extracted, and then subjected to a water bath. The reaction solution is separated, acid-precipitated, and alcohol-precipitated to obtain crude hemicellulose. 2) Acid hydrolysis: The crude product is mixed with sulfuric acid solution and hydrolyzed under heating to obtain a hydrolysate rich in xylose and L-arabinose. The optimal combination of process parameters was determined through single-factor and synergistic optimization: Alkaline extraction: 3% NaOH, 1:8 solid-liquid ratio, 60℃, 1.5h; Acid hydrolysis: 1.5% H2SO4, 1:12 solid-liquid ratio, 130℃, 60min. The pentose yield per gram of spent grains reaches 182–198 mg, the xylose yield is 41.3%–42.8%, and the furfural formation rate is less than 1.5%. This method achieves efficient and high-value conversion of hemicellulose from spent grains, and the process is simple and environmentally friendly.
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