期刊
CARBOHYDRATE RESEARCH
卷 512, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.carres.2021.108498
关键词
Selenium-containing polysaccharides; Subcritical water; Structural characterization; Antioxidant activity
资金
- National 13th five year plan key RD project [2019YFC 1606703]
This study extracted selenium polysaccharides from the leaves of pennycress using an efficient subcritical water extraction process, and identified their structures. The results showed that the two fractions have antioxidant activities, suggesting their potential applications as natural antioxidants in food and medicine.
Selenium polysaccharides have antioxidant, anti-tumor and other activities. Tea selenium polysaccharides and Lentinan selenium polysaccharides, etc. have been studied. Pennycress is a super-rich selenium plant and there are few studies about pennycress selenium-containing polysaccharides. In this study, the following researches were carried out on pennycress selenium polysaccharides: Selenium-containing polysaccharides were extracted from the leaves of pennycress (Thlaspi arvense L.) using an efficient subcritical water extraction (SWE) process. After purification, two fractions (Se-PPS1 and Se-PPS3) were obtained and subjected to structural identification. The results showed that the molecular weights of Se-PPS1 and Se-PPS3 were 4.2 x 10(4) Da and 4.5 x 10(4) Da, respectively. Se-PPS1 is mainly comprised of glucose, galactose, and xylose. Se-PPS3 consists of glucuronic acid, rhamnose, galacturonic acid, glucose, galactose, xylose, and arabinose. Fourier transform infrared spectroscopy (FT-IR) analysis showed that the two fractions had absorption spectra typical of selenium esters and spectral characteristics of polysaccharides. The glycosidic linkages were determined by Gas chromatography-mass spectrometry (GC-MS) and Nuclear magnetic resonance (NMR). The two fractions have (1 -> 6)-beta-D-Galp and T-alpha-D-Glcp configurations. Moreover, in vitro antioxidant activity assays showed that Se-PPS1 and Se-PPS3 exhibited effective radical-scavenging abilities, suggesting they have potential applications as natural antioxi-dants in food and medicine.
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