超声波法辅助定向降解阿拉伯半乳聚糖的研究

doi:10.3969/j.issn.0253-2417.2018.04.010

Abstract

Abstract: Arabinogalactan (AG) was extracted from the sawdust of larch (Larix gmelinii(Rupr.) Kuzen). The arabinogalactan obtained was physically degraded by ultrasound-assisted free radicals. The free radical scavenging ability of decomposed AG was selected as an indicator on the evaluation of the antioxidant activity. On the basis of single-factor test, response surface optimization was used to determine the optimal degradation conditions, and the optimum conditions are found as follows:the dpolysaccharide concentration was 10 g/L; ultrasonic temperature was 60℃; the H₂O₂ volume fraction was 6%;and the ultrasonic time was 60 min. Under this optimum degradation condition, the·OH scavenging rate of arabinogalactan was 89.6%, and Mr of AG was degraded from 52 ku to around 25 ku, and the cumulative weight fraction of this molecular weight reached 60%.Compared with AG, the antioxidant activity of arabinogalactan oligosaccharide(AG-O) obtained in the anti-oxidative activity was significantly enhanced, and its IC₅₀ value decreased from 2.058 g/L to 0.497g/L.

Key words: arabinogalactan, free radical scavenging, response surface optimizatio

CLC Number:

TQ35

ZHANG Haiyun, HE Liang, LI Qin, YANG Bo, YANG Guang. Ultrasonic-assisted Radical Process for Directed Degradation of Arabinogalactan[J]. Chemistry and Industry of Forest Products, 2018, 38(4): 61-68.

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Ultrasonic-assisted Radical Process for Directed Degradation of Arabinogalactan

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