ass日本风韵熟妇pics男人扒开女人屁屁桶到爽|扒开胸露出奶头亲吻视频|邻居少妇的诱惑|人人妻在线播放|日日摸夜夜摸狠狠摸婷婷|制服 丝袜 人妻|激情熟妇中文字幕|看黄色欧美特一级|日本av人妻系列|高潮对白av,丰满岳妇乱熟妇之荡,日本丰满熟妇乱又伦,日韩欧美一区二区三区在线

Pumpkin polysaccharides were extracted with hot water and deproteinized by Saveg method. After rehydration with distilled water, soluble polysaccharides were successively fractionated by different gradient concentrations of ethanol（0～30%,，30%～60%，60%～80%）into three precipitation fractions, named PSP-30, PSP-60 and PSP-80. Contents of sugar, protein and monosaccharide composition were determined, UV and IR spectroscopy analysis were run simultaneously to determine their spectroscopy properties. The results indicated that all three fractions were combined with a certain amount of protein, and uronic acid was not found. PSP-30 and PSP-60 were composed of mannose, arabinose, xylose, mannose, glucose and galactose, but PSP-80 was composed of mannose, arabinose, xylose, glucose and galactose. Each of these fractions all had good scavenging effect on DPPH free radical, and PSP-60 removal rate was the highest, its removal rate was 61.90% at concentration of 2.5 mg/mL, PSP-60 was treated with different frequencies ultrasonic, the mol ratios of these monosaccharides and antioxidant activity were changed. The results confirm that ultrasonic can cause monosaccharide transformation and biological activity change of polysaccharides. However, there is no regularity between the increase of ultrasound frequency and the monosaccharide composition after transformation. So the effect of ultrasound on polysaccharide structure is still a task to be studied.