4.7 Article

Structure of corn bran hemicelluloses isolated with aqueous ethanol solutions and their potential to produce furfural

期刊

CARBOHYDRATE POLYMERS
卷 288, 期 -, 页码 -

出版社

ELSEVIER SCI LTD
DOI: 10.1016/j.carbpol.2022.119420

关键词

Corn bran; Hemicelluloses; Structural features; Furfural production; Cellulase enzymatic hydrolysis

资金

  1. Fundamental Research Funds for the Central Universities [2019ZY02]
  2. National Natural Science Foundation of China [32071717]

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In this study, alkali-soluble hemicelluloses from corn bran were further isolated and it was found that high molecular weight linear hemicelluloses can be precipitated in high concentrations of ethanol water solutions. The relationship between the structural features of these hemicelluloses and furfural yield was investigated and it was discovered that hemicelluloses with high xylose content are beneficial for furfural production.
The alkali-soluble hemicelluloses extracted with 10% KOH solution from corn bran were further isolated with different concentrations of aqueous ethanol solutions. Herein 92.2% of the original hemicelluloses can be obtained and the cellulase enzymatic hydrolysis rate of the alkali treated corn bran can reach to 97.2%. The corn bran hemicelluloses were mainly glucuronoarabinoxylan, in which xylose (48.4-53.8%) and arabinose (27.8-33.2%) were the main components. More linear hemicelluloses with high molecular weight tended to be precipitated in low concentration aqueous ethanol solutions. Furthermore, the relationship between the structural features of these alkali-soluble corn bran hemicelluloses and their furfural yield was investigated in MIBK (methyl isobutyl ketone)/H2O biphasic system. Results showed that the hemicelluloses with high xylose content are benefit to the furfural production, and the highest furfural yield of 67.7% was obtained.

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