期刊
INDUSTRIAL CROPS AND PRODUCTS
卷 147, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.indcrop.2020.112249
关键词
Microwave-assisted extraction; Polysaccharide; Structure; Thermal and rheological properties; Bioactivities
资金
- National Natural Science Foundation of China [31600276]
- Postdoctoral Scientific Research Start-up Fund Project of Heilongjiang Province of China [LBH-Q17030]
- Student's Innovation Training Program of Heilongjiang Province [201910224076]
Microwave-assisted extraction of the polysaccharide from blackcurrant (Ribes nigrum L.) fruits (MBP) was optimized using response surface methodology (RSM). The yield of MBP was 10.59 % (w/w) under the optimal conditions of power (414 W), liquid to material ratio (31/1 mL/g), and the time (41 min). After purification using D4006 macroporous resin and Sepharose-6B column chromatography, a water-soluble acidic heteropolysaccharide (PMBP) was obtained with a molecular weight of 1.99 x 10(6) g/mol. PMBP was thermally stable and exhibited excellent rheological properties. Fourier transform infrared spectroscopy, gas chromatography and nuclear magnetic resonance analysis confirmed the presence of alpha-,beta-pyranose and six main glycosidic linkages in PMBP. Scanning electron microscopy, atomic force microscopy, and X-ray diffraction studies demonstrated that PMBP was amorphous aggregates with irregular shape, porous, and smooth surface. Bioactivity assays revealed the notable antioxidant and hypoglycemic activities of PMBP. Moreover, PMBP was kinetically characterized as a competitive inhibitor for alpha-amylase and alpha-glucosidase.
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