Structural Features of a Polysaccharide from Centella asiatica

Centella asiatica has been used as remedy for sodation, stabilization and against lepra, anabrosis1 in the oriental countries. The low-molecular-weight constituents in Centella asiatica have been investigated1. However, no polysaccharides have been reported. 1BI was the first polysaccharide isolated from C. asiatica, which had immunostimulating activity in vitro. In present study, we report the structural features of 1BI. Experimental Extraction, isolation and purification Dried C.…     

Component Analysis and Free Radicals Scavenging Activity of Physalis alkekengi L.Polysaccharide

A crude polysaccharide was extracted from Physalis alkekengi L. fruit. HPLC was used for the component analysis of the polysaccharide. The results indicate that Physalis alkekengi L. polysaccharide（PAP） was composed of rhamnose, xylose, arabinose, galactose, and glucose. Free radicals scavenging activity of PAP was studied through 3 free radicals scavenging tests. PAP exhibited high scavenging effects on OH and DPPH radicals, and both the scavenging rates were about 80%. The scavenging rate of O2^- radical was about 22%.     

元胡多糖YhPS-1的理化性质、结构分析及抗肿瘤活性研究

A polysaccharide named YhPS- 1 was isolated from the root of Cordalis yanhusuo Wang and purified by means of gel-permeation chromatography and ionexchange chromatography. Its physicochemical properties, including monosaccharide composition, carbohydrate content, molecular weight and elemental composition, were determined. The structure of YhPS-1 was elucidated by chemical methods along with ^1H and ^13C NMR spectroscopy ways, such as including two-dimensional HMQC and HMBC experiments. These results show that YhPS-1 possesses a backbone consisting of terminal α-Glcp-（1→, a-Glcp-（1→6）, a-Glcp-（1→4） and a-Glcp-（1→4,6）. The bioactive assay showed that it could inhibit the growth of Sarcoma 180 and Lewis pulmonary carcinoma implanted in mice.     

Preparation and Identification of Angelica sinensis Polysaccharide-iron Complex

Angelica sinensis polysaccharide(ASP) was extracted from Angelica sinensis by boiling water. An Angelica sinensis polysaccharide-iron complex(APC) was prepared under the alkaline condition by adding a ferric chloride solution to the ASP solution. Then some identifiable properties of the complex were studied. The content of iron (Ⅲ) in the complex was determined with iodometry. The thermal property, the microscopic structure, the spectral characteristics, and N, C, H contents of the complex were examined by a variety of techniques including DSC, TEM, IR,NMR, and elemental analysis. The content of iron (Ⅲ) in the complex ranges from 10% to 40%. The DSC result shows that the melting point of the complex is about 450 ℃. The TEM result shows that the complex has an iron(Ⅲ)core(β-FeOOH core) linked by hydroxy and oxy bridges, with the polysaccharide chains attached to the surface of the core. The IR and NMR results also show that there is aβ-FeOOH core in the complex. The elemental analysis shows that the contents of N, C , H in the complex are, respectively, lower than those of N, C, H in ASP. All our studies indicate that the APC consists of aβ-FeOOH core surrounded by ASP.     

Selective Acid Hydrolysis Condition for the Composition and Linkage with a Fructofuranosyl Backbone of a Polysaccharide from Angelica sinensis （Oliv） Diels

Angelica sinensis is a well-known Chinese traditional herbal medicine. Its roots have been widely used over two thousand years for tonifying blood, promoting blood circulation, regulating menorrhea and subduing inflammation1. The polysaccharide of the ASD…     

超声波对多聚糖结构特性的影响

本文以灵芝为主要对象研究了多糖结构和微晶束结构及其稳定性和抗解性，通过对加超声能量场，对结晶结构施加强烈的机构冲击，使稳定性和抗解性消弱。     

改性羧甲基羟丙基田菁胶热裂解动力学研究

通过研究羟丙基田菁胶、羧甲基羟丙基田菁胶和改性羧甲基羟丙基田菁胶水溶液在不同温度下的粘性行为及其样品在流动空气和氮气流中的热裂解和裂解活化能计算，探讨了改性羧甲基羟丙基田菁胶的热稳定性．结果表明：与羟丙基田菁胶和羧甲基羟丙基田菁胶相比较，改性羧甲基羟丙基田菁胶的粘度热稳定性和裂解热稳定性高于羟丙基田菁胶和羧甲基羟丙基田菁胶，并且指出它们的热裂解属无规引发过程和以无规分布为主的非结晶状态．     

蛋白质膜界面流变行为研究进展

随着界面流变测量技术以及相关的光学辅助仪器的发展,近10年来界面流变学在食品、化妆品、医药等领域发挥了重要作用。本文介绍了近年来蛋白质膜界面流变行为的研究进展,着重介绍了蛋白质界面流变学在泡沫和乳液方面的研究。本文主要分为3个部分,内容包括:蛋白质膜界面流变学行为与泡沫、乳液稳定性的相互关系,蛋白质-多聚糖的界面流变行为研究,蛋白质-表面活性物质的界面流变行为研究。界面流变学在泡沫和乳液方面取得的较快研究进展不仅促进了人们对蛋白质膜界面流变行为更为深刻的理解,而且为更好地开发和应用蛋白质及其混合物作为表面活性物质和胶体稳定剂而提供重要的理论依据和指导。     

Structure of an Extracellular Polysaccharide from a Strain of Lactic Acid Bacteria

A new extracellular polysaccharide (EPS-I) isolated and purified from Z222, a strain of Lactic acid bacteria has been investigated. Sugar composition analysis, methylation analysis and ^1H NMR and ^13C NMR spectroscopy reveal that the EPS-I is composed of a pentasaccharide repeating unit. The sequence of sugar residue was determined by using two-dlmensional NMR spectroscopy, including heteronudear multiple-bond correlation(HMBC) and nuclear overhauser effect spectroscopy (NOESY).