Physico-chemical characterization, antioxidant and anticancer activities in vitro of a novel polysaccharide from Melia toosendan Sieb. Et Zucc fruit |
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Authors: | He Liang Ji Pengfei Gong Xingguo Li Weiqi Cheng Junwen Qian Hua Song Xianliang |
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Affiliation: | a Institute of Biochemistry, College of Life Sciences, Zhejiang University, Hangzhou 310027, China b Institute of Biological Technology, Zhejiang Forestry Academy, Hangzhou 310023, China c Zhejiang Provincial Key Laboratory of Biological and Chemical Utilization of Forest Resources, Hangzhou 310023, China d Chemical Engineering of Forestry Products, College of Material and Science Technology, Beijing Forestry University, Beijing 10083, China |
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Abstract: | A novel water-soluble polysaccharide pMTPS-3, obtained from Melia toosendan Sieb. Et Zucc fruit by hot-water extraction and ethanol precipitation, was fractionated by DEAE-52 cellulose anion-exchange and Sephadex G-100 gel filtration chromatography. Its primary structural features and molecular weight were characterized by Fourier infrared spectrometry (FTIR), gel permeation chromatography (GPC) and gas chromatography (GC). And the antioxidant activities of pMTPS-3 in vitro were evaluated by 1,1-diphenyl-2-picrylhydrazyl (DPPH) free radical scavenging assay, superoxide radical scavenging assay and hydroxyl radical scavenging assay. The results suggested that pMTPS-3 was a heteropolysaccharide, composed of arabinose, glucose, mannose, and galactose in the molar ratio of 17.3:28.3:41.6:12.6 with molecular weight 26 100 Da. The purified pMTPS-3 was revealed to have notable scavenging activity against DPPH radical in a concentration-dependent manner and present a moderate inhibition of superoxide radicals with an IC50 (5.6 mg/ml), and potent inhibiting power for hydroxyl radical compared with crude polysaccharide. Further, it exhibited strong inhibition effect in vitro on the growth of human gastric cancer BGC-823 cells. It is strongly evidenced that pMTPS-3 purified from the crude polysaccharides of Melia toosendan Sieb. Et Zucc could be explored as a potential antioxidant and therapeutics. |
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Keywords: | Melia toosendan Sieb. Et Zucc Polysaccharides Physico-chemical characterization Antioxidant activity Anticancer activity |
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