LAUSR

We examined the antioxidant and antimicrobial attributes of Polygonatum cyrtonema Hua polysaccharides (HBSS, CHSS, DASS, CASS). The UV spectra and FT-IR results showed the purity and acidic nature of polysaccharides with β-configurations. DASS (78.585% hydroxyl radical scavenging, 92.794% ABTS radical scavenging, 75.648% DPPH radical scavenging activity, 0.582 reducing power and 98.721% Fe2+ chelation at 5mg/mL) possessed the best antioxidant potential; while, HBSS (21.113% hydroxyl radical scavenging, 14.412% ABTS radical scavenging, 28.005% DPPH radical scavenging activity, 0.285 reducing power and 48.969% Fe2+ chelation at 5mg/mL) was observed with the lowest antioxidant action. The bacterial inhibition effect of four PCHPs on Gram-positive organisms (B. subtilis and S. aureus with the maximum inhibitory diameters of 18.9 and 15.8mm, respectively) was better than that of Gram-negative bacteria (E. coli and S. typhimurium with the maximum inhibitory diameters of 10.9 and 8.4mm, respectively). The bacterial sensitivity was observed in the following order: B. subtilis>S. aureus>E. coli>S. typhimurium. The trend of antibacterial action of PCHPs was in following order: DASS>CHSS>CASS>HBSS. DASS can be considered as natural anti-oxidant as well as spoilage inhibitors to enhance the nutritive and functional values of various foods.