Extraction, Acetylation Modification and Structure Characterization of Hemicelluloses from Corncob

PENG Qiao; ZHAO Sijiu; FAN Guozhi; CHENG Qunpeng; SONG Guangsen

doi:10.13386/j.issn1002-0306.2021080087

Volume 43 Issue 11

May 2022

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Science and Technology of Food Industry > 2022 > 43(11): 45-51. > DOI: 10.13386/j.issn1002-0306.2021080087

PENG Qiao, ZHAO Sijiu, FAN Guozhi, et al. Extraction, Acetylation Modification and Structure Characterization of Hemicelluloses from Corncob[J]. Science and Technology of Food Industry, 2022, 43(11): 45−51. (in Chinese with English abstract). doi: 10.13386/j.issn1002-0306.2021080087.

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Extraction, Acetylation Modification and Structure Characterization of Hemicelluloses from Corncob

School of Chemical and Environmental Engineering, Wuhan Polytechnic University, Wuhan 430023, China

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Received Date: August 08, 2021
Available Online: March 29, 2022

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Abstract

Hemicellulose was extracted from corncob and further modified by acetylation. Ultrasonic-assisted alkali method was employed for the extraction, in which sulfuric acid (H₂SO₄) and elemental iodine (I₂) were used as co-catalyst for the acetylation of hemicellulose, respectively. Corncob hemicellulose and its acetylated products were characterized by infrared spectroscopy (IR), thermogravimetric analysis (TGA) and nuclear magnetic resonance (NMR). The yield and extraction rate of corncob hemicellulose were 33.7% and 81.0%, and the hemicellulose content reached 85.3wt%. The acetylation of corncob hemicellulose gave 84.6% yield and 1.27 degree of substitution (DS), respectively. The separation of hemicellulose from corncob using alkali method was effectively shortened by ultrasonic assistance, and the yield and extraction rate of corncob hemicellulose were improved. Concentrated sulfuric acid (H₂SO₄) and elemental iodine (I₂) were effective co-catalyst for the acetylation of corncob hemicellulose. The results of IR and NMR showed that hemicelluloses were acetylated successfully, and TGA revealed that the thermal stability of the acetylated hemicellulose was improved. Moreover, the DS value of the acetylated product was moderate. Therefore, the acetylated product is expected to be used to prepare biodegradable materials for food packaging.
- ultrasonic assistance,
- corncob,
- hemicellulose,
- alkaline extraction,
- acetylation,
- structure characterization

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