Effect of ultrasonic treatment on immunological activities of polysaccharides from adlay

anglais. peer reviewed

anglais. Alkali-extractable polysaccharides from the seed of adlay and their two polysaccharide sub-fractions (AAP-1 and AAP-2) were isolated and purified by anion-exchange and gel filtration chromatography. Ultrasonic treatment was put in place to obtain AAP-1' and AAP-2'. Average molecular weights (Mws) of AAP-1, AAP-1', AAP-2, and AAP-2' were 94.2. kDa, 63.1. kDa, 82.3. kDa, and 60.4. kDa, respectively. Monosaccharides composition analysis indicated that AAP-1 and AAP-1' were composed of Rha, Ara, Glc, and Gal in a molar ratio of 1.1:0.4:0.7:0.5 and 1.4:1.6:0.4:0.7. AAP-2 and AAP-2' were composed of Xyl, Rha, Gal and Glc in a molar percent of 0.4:1.4:1.6:0.5 and 0.3:1.6:1.1:0.7. In vitro study showed that AAP-1, AAP-1', AAP-2, and AAP-2' were all able to encourage the production of secretory molecules (NO, TNF-α and IL-6) of RAW264.7 murine macrophages in concentrations determines manner. AAP-2' seemed to be the most potent and induced significantly higher the NO production. These findings suggest that the ultrasonic polysaccharides isolated in our study have immune potentiation effects on macrophages and should serve as a beneficial health food. © 2015 Elsevier B.V.

Hong Kong, Macao and Taiwan Science & Technology Cooperation Program of China (2014DFT30280, 2013DFT3050); Special Fund for Agro-scientific Research in the Public Interest (201303069); Earmarked Fund for China Agriculture Research System Modern Agro-industry Technology (CYTX-014); Agricultural Science and Technology Program for Innovation Team on Identification and Excavation of Elite Crop Germplasm, CAAS