1. Structural Analysis and Antioxidant Activity of Alkaline-Extracted Glucans from Hericium erinaceus.
- Author
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Qiao, Zhonghui, Jia, Xiushi, Wang, Yuanning, Wang, Yuan, Zhou, Yifa, Li, Fan, Qu, Yunhe, and Cheng, Hairong
- Subjects
TIME-of-flight mass spectrometry ,HERICIUM erinaceus ,DEGREE of polymerization ,POLYSACCHARIDES ,FRUITING bodies (Fungi) ,DESORPTION ionization mass spectrometry ,MATRIX-assisted laser desorption-ionization - Abstract
An alkali-soluble β-glucan (AHEP-A-b, 20 kDa) purified from Hericium erinaceus fruiting bodies, was structurally characterized and examined for antioxidant activity. Methylation analysis and NMR spectroscopy show that the backbone of AHEP-A-b is composed of (1→6)-linked-D-β-glucopyran residues, branched at O-3 of glucopyranose (Glcp) residues with [→3)-β-D-Glcp-(1→] oligosaccharides or single unit of β-Glcp. Periodate oxidation analysis and matrix-assisted laser desorption/ionization time of flight mass spectrometry (MALDI-TOF-MS) indicate that the degree of polymerization (DP) of [→3)-β-D-Glcp-(1→] side chains is 2 to 8. Functionally, AHEP-A-b is a relatively strong antioxidant as demonstrated by using 2, 2′-azino-bis-(3-ethylbenzthiazoline-6-sulfonic acid) (ABTS) free radical (ABTS
·+ ), 1,1-diphenyl-2-picrylhydrazyl (DPPH) radicals, and hydroxyl radicals scavenging assays. The present study lays the foundation for further studies into structure-activity relationships of polysaccharides from H. erinaceus. [ABSTRACT FROM AUTHOR]- Published
- 2024
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