The polysaccharides from pumpkin fruit （PP） were obtained and purified by hot-water extraction, anion-exchange chromatography, and gel column chromatography. The physicochemical properties of PP were determined by g...The polysaccharides from pumpkin fruit （PP） were obtained and purified by hot-water extraction, anion-exchange chromatography, and gel column chromatography. The physicochemical properties of PP were determined by gel filtration chromatography, gas chromatography, fourier transform infrared （FTIR） spectroscopy, and nuclear magnetic resonance （NMR） spectroscopy. Results indicated that the molecular weight of PP was about 23 kDa and PP was composed of D-Arabinose, D-Marmose, D-Glucose, and D-Galactose with a molar ratio of 1 ： 7.79 ： 70.32 ： 7.05. FTIR and NMR spectra indicated that PP was the polysaccharide containing pyranose ring. Additionally, PP protected islets cells from streptozotocin （STZ） injury in vitro via increasing the levels of super-oxide dismutase （SOD） and malondialdehyde （MDA） and reducing the production of NO. The experiment of reverse transcriptase-polymerase chain reaction further proved that PP inhibited apoptosis via modulating the expression of Bax/Bcl-2 in STZ-damaged islet cells. In conclusion, PP could be explored as a novel agent for the treatment of diabetes mellitus.展开更多
基金supported by the Natural Science Foundation Committee of China(NSFC 81202467)the Natural Science Foundation of Jiangsu Province in China(BK2012232)+2 种基金the Natural Science Research Project of Universities in Jiangsu Province of China(11KJB350004,06KJD310150,12KJB310012)the Natural Science Foundation of Nantong City of China(BK2011044)a project funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions
文摘The polysaccharides from pumpkin fruit （PP） were obtained and purified by hot-water extraction, anion-exchange chromatography, and gel column chromatography. The physicochemical properties of PP were determined by gel filtration chromatography, gas chromatography, fourier transform infrared （FTIR） spectroscopy, and nuclear magnetic resonance （NMR） spectroscopy. Results indicated that the molecular weight of PP was about 23 kDa and PP was composed of D-Arabinose, D-Marmose, D-Glucose, and D-Galactose with a molar ratio of 1 ： 7.79 ： 70.32 ： 7.05. FTIR and NMR spectra indicated that PP was the polysaccharide containing pyranose ring. Additionally, PP protected islets cells from streptozotocin （STZ） injury in vitro via increasing the levels of super-oxide dismutase （SOD） and malondialdehyde （MDA） and reducing the production of NO. The experiment of reverse transcriptase-polymerase chain reaction further proved that PP inhibited apoptosis via modulating the expression of Bax/Bcl-2 in STZ-damaged islet cells. In conclusion, PP could be explored as a novel agent for the treatment of diabetes mellitus.
