ALKALI EXTRACTION AND PHYSICOCHEMICAL CHARACTERIZATION OF HEMICELLULOSES FROM YOUNG BAMBOO (PHYLLOSTACHYS PUBESCENS MAZEL)

Qiang Luo, Hong Peng, Mengyang Zhou, Da Lin, Roger Ruan, Yiqin Wan, Jinsheng Zhang, Yuhuan Liu

Abstract


Two hemicellulose fractions were obtained by extraction of one-month- old young bamboo (Phyllostachys pubescens Mazel). The fractionation procedure employed 2% NaOH as extractant, followed by filtration, acidification, precipitation, and washing with 70% ethanol solution. The total yield was 26.2%, based on the pentosan content in bamboo. The physicochemical properties were determined and sugar composition analysis showed that the hemicelluloses consisted mainly of xylose, arabinose, galactose, and a small amount of uronic acid. Furthermore, based on FT-IR and NMR spectra analyses, the structure of hemicelluloses was determined to be mainly arabinoxylans linked via (1→4)-β-glycosidic bonds with branches of arabinose and 4-O-methyl-D-glucuronic acid. The molecular weights were 6387 Da and 4076 Da, corresponding to the hemicelluloses HA and HB. Finally, the thermal stability was elucidated using the TG-DTG method. The obtained results can provide important information for understanding young bamboo and the hemicelluloses in it.

Keywords


Young bamboo; Hemicelluloses; Physicochemical characterization; Arabinoxylans

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