“…Polysaccharides from natural sources have attracted increasing attention in recent years due to their potential biological functions, especially their antioxidant and immunomodulation activities, such as scavenging free radical, inhibiting lipid oxidation, promoting natural killer (NK) cell cytotoxicity, activating macrophages and potentiating interleukins (Song, Zhang, Zhang, & Wang, 2010;Yang, Zhao, & Lv, 2008;Zhu & Lin, 2006). The bioactivity of polysaccharides mainly depends on several structural parameters, including the sugar composition, molecular weight, type of glycoside bond, and degree of sulfation (Li, Huang, Lu, & Hou, 2011).…”