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Extraction and Carboxymethylation of Hemicelluloses from Moso Bamboo
Received:February 06, 2023  
DOI：10.11980/j.issn.0254-508X.2023.11.009
Key Words:moso bamboo  hemicellulose  carboxymethyl hemicellulose  modification
Fund Project:国家自然科学基金青年项目（22208309）；浙江省自然科学基金（LQ21C160006）；浙江省重点研发计划（2020C02021）；衢州市科技计划项目（2022Z07）。
Author NameAffiliationPostcode
BAI Xuechun* Pulp and Papermaking Research Center， College of Textile Science and Engineering， Zhejiang Sci-Tech University， Hangzhou， Zhejiang Province， 310018 310018
CHEN Tianying Pulp and Papermaking Research Center， College of Textile Science and Engineering， Zhejiang Sci-Tech University， Hangzhou， Zhejiang Province， 310018 310018
LI Mian Zhejiang Huakang Pharmaceutical Co.， Ltd.， Quzhou， Zhejiang Province， 304200 304200
YANG Wulong Zhejiang Huakang Pharmaceutical Co.， Ltd.， Quzhou， Zhejiang Province， 304200 304200
XU Weidong Zhejiang Huakang Pharmaceutical Co.， Ltd.， Quzhou， Zhejiang Province， 304200 304200
ZHENG Xiaoyang Jiaozuo Huakang Sugar Alcohol Technology Co.， Ltd.， Jiaozuo， He’nan Province， 454150 454150
ZHANG Weihong Jiaozuo Huakang Sugar Alcohol Technology Co.， Ltd.， Jiaozuo， He’nan Province， 454150 454150
TANG Yanjun Pulp and Papermaking Research Center， College of Textile Science and Engineering， Zhejiang Sci-Tech University， Hangzhou， Zhejiang Province， 310018 310018
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Abstract:In this study， the hemicelluloses were separated from moso bamboo via alkaline hydrogen peroxide method， and then modified by carboxymethylation with ultrasonic assistance. The results showed that the highest hemicelluloses yield of 18.00% was achieved at a liquid to solid ratio of 20∶1. The optimum preparation process was proved as follows： the concentration of NaOH was 1.2 mol/L， the concentration of chloroacetic acid was 0.6 mol/L， the alkalization time and temperature were 40 min and 30 ℃，respectively， the etherification time and temperature were 150 min and 70 ℃， respectively. With the increase of carboxymethyl hemicellulose substitution degree， the maximum degradation temperature of hemicellulose before and after modification increased from 257 ℃ to 300 ℃， indicating that carboxymethyl modification could improve the thermal stability of hemicelluloses. Moreover， the absolute value of Zeta potential increased from 9.98 mV to 38.00 mV （substitution degree=0.59）， and the dispersibility of carboxymethyl hemicelluloses was significantly improved.
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