为了寻找多糖类血管生成抑制剂,我们以蜈蚣藻(Grateloupia filicina)为原料,经水提、醇沉、DEAE-Sepharose Fast Flow和Sepharose CL-6B凝胶柱层析分离纯化,得到一个均一多糖(GFP15).采用HPGPC、糖组成分析、绝对构型测定、甲基化分析...为了寻找多糖类血管生成抑制剂,我们以蜈蚣藻(Grateloupia filicina)为原料,经水提、醇沉、DEAE-Sepharose Fast Flow和Sepharose CL-6B凝胶柱层析分离纯化,得到一个均一多糖(GFP15).采用HPGPC、糖组成分析、绝对构型测定、甲基化分析、IR和NMR等技术对GFP15进行结构鉴定.结果表明,GFP15为一琼胶和卡拉胶中间型的硫酸半乳聚糖,主要由1,3连接的β-D-半乳糖和1,4连接的2,3位硫酸基双取代的α-D-半乳糖交替组成,1,3连接β-D-半乳糖的4位和6位上分别有少量的硫酸基取代,1,4连接的半乳糖有少量是α-L-半乳糖,此外,还有极少量的木糖、3,6-脱水半乳糖和6-甲基-半乳糖.利用鸡胚尿囊膜法(CAM)对GFP15进行抗新生血管生成活性评价,结果显示,GFP15(100μg/egg)能抑制尿囊膜新生血管的形成,提示GFP15作为一种多糖类血管生成抑制剂具有开发为抗肿瘤药物的潜在价值.展开更多
Four kinds of polysaccharides (FA, FB, FC and FD) were extracted and purified from a red alga Furcellaria lumbri-calis. Their monosaccharide composition, average molecular mass (Mw) and structural feature were determi...Four kinds of polysaccharides (FA, FB, FC and FD) were extracted and purified from a red alga Furcellaria lumbri-calis. Their monosaccharide composition, average molecular mass (Mw) and structural feature were determined by gas chromatog-raphy (GC), high performance gel permeation chromatography (HPGPC) and Fourier transform infrared spectroscopy (FTIR), respectively. The results showed that FA and FB were composed of galactose (Gal), 3,6-anhydro-galactose (AnG) and 4-sulfated-galactose (G4S), which were structurally similar to β-carrageenan and κ-carrageenan. FC was composed of sulfated galactose and small amount of AnG, indicating that it was a hybrid-sulfated galactan. FD was composed of α-1, 4-glucose and belonged to floridean starch. The respective yields of FA, FB, FC and FD were 4.84%,33.74%,8.76% and 13.5%, and the cor-responding Mw were 537 kD, 432 kD, 513 kD and 51 kD respectively. Owning to its high content ( >60%) of polysaccharide, F. lumbricalis will be a good source of marine sulfated polysaccharide and shows its potential utilization in food and medicine.展开更多
目的:研究半乳聚糖的快速、高效制备方法,并对产物进行结构分析。方法:在微波辐照下,以半乳糖为底物,氯化钠溶液为引发剂,杂多酸为反应催化剂,催化底物脱水缩合生成半乳聚糖,并通过乙醇沉淀去除催化剂和引发剂,Sephadex G-25葡聚糖凝胶...目的:研究半乳聚糖的快速、高效制备方法,并对产物进行结构分析。方法:在微波辐照下,以半乳糖为底物,氯化钠溶液为引发剂,杂多酸为反应催化剂,催化底物脱水缩合生成半乳聚糖,并通过乙醇沉淀去除催化剂和引发剂,Sephadex G-25葡聚糖凝胶柱分级纯化,高效凝胶渗透色谱分析半乳聚糖的纯度及聚合度,高效阴离子交换色谱分析单糖组成,最后通过红外光谱分析半乳聚糖的构型。结果:半乳聚糖的最优合成条件为引发剂浓度0.25 mol/L、催化剂添加量1.1%、反应温度130℃、微波辐照4.5 min,半乳糖转化率为97.22%。半乳聚糖的平均分子质量为2.853 k D,平均聚合度为17。单糖组成为半乳糖及微量葡萄糖。红外光谱及氢核磁共振波谱(1H-nuclear magnetic resonance,1H-NMR)分析表明半乳聚糖残基以β-构型为主。结论:可以通过微波辐照杂多酸催化的方法快速、高效制备半乳聚糖。展开更多
Three kinds of polysaccharides： GFW, GFH and GFA, were sequentially extracted from a red alga Gloiopeltisfurcata with 25℃ and 85℃ water, and 60℃ 4% NaOH water solution. Based on the defatted alga, the yields of th...Three kinds of polysaccharides： GFW, GFH and GFA, were sequentially extracted from a red alga Gloiopeltisfurcata with 25℃ and 85℃ water, and 60℃ 4% NaOH water solution. Based on the defatted alga, the yields of the polysaccharide were 57.9%, 2.5% and 2.6%, respectively. Their monosaccharide compositions, average molecular weights and structural characters were determined by gas chromatography （GC）, high performance liquid chromatography （HPLC）, fourier transform infrared spectroscopy （FTIR） or ^13C-NMR spectroscopy. The results showed that GFW, GFH and GFA were all composed of D-galactose （Gal） and 3,6-anhydro-L-galactose （AnG）, and particularly GFA also contained xylose （Xyl）. The average molecular weights of GFW, GFH and GFA were 22.6 kD, 26.5 kD and 49.8 kD, respectively, with the respective sulfate content 31.2%, 25.1% and 22.7%. The data of FTIR and ^13C-NMR confirmed the sulfate ester location at C6 ofgalactose. It is concluded that all the three polysaecharides extracted from Gloiopeltisfurcata were sulfated galactans, two being sulfated-agarose, and one being xylose-containing sulfated galactan.展开更多
目的从裂壶藻(Schizochytrium limacinum)中提取分离多糖并对其进行结构特性分析。方法采用热水提取并结合Q-Sepharose Fast Flow强阴离子交换柱分离,从中获得2种多糖组分(SLW1和SLW2)。运用高效液相色谱法(HPLC)、高效凝胶渗透色谱法(H...目的从裂壶藻(Schizochytrium limacinum)中提取分离多糖并对其进行结构特性分析。方法采用热水提取并结合Q-Sepharose Fast Flow强阴离子交换柱分离,从中获得2种多糖组分(SLW1和SLW2)。运用高效液相色谱法(HPLC)、高效凝胶渗透色谱法(HPGPC)、傅里叶变换红外光谱(FTIR)、甲基化和核磁共振碳谱(13 C-NMR)法分别对其单糖组成、相对分子质量及结构特性进行了分析。结果 2种多糖均以Gal为主(>75%),且含有少量的Glc、Man和GlcN;相对分子质量分别为39.8kD和103.8kD;FTIR显示它们均属于硫酸多糖,其硫酸酯基主要位于半乳糖残基的C6位。结论结构分析表明:SLW2中含有→6)Galf(1→、→5)Galf(1→、→3,4)Galp(1→、→3)Galp(1→以及→4,6)Galp(1→等多种连接方式。展开更多
文摘为了寻找多糖类血管生成抑制剂,我们以蜈蚣藻(Grateloupia filicina)为原料,经水提、醇沉、DEAE-Sepharose Fast Flow和Sepharose CL-6B凝胶柱层析分离纯化,得到一个均一多糖(GFP15).采用HPGPC、糖组成分析、绝对构型测定、甲基化分析、IR和NMR等技术对GFP15进行结构鉴定.结果表明,GFP15为一琼胶和卡拉胶中间型的硫酸半乳聚糖,主要由1,3连接的β-D-半乳糖和1,4连接的2,3位硫酸基双取代的α-D-半乳糖交替组成,1,3连接β-D-半乳糖的4位和6位上分别有少量的硫酸基取代,1,4连接的半乳糖有少量是α-L-半乳糖,此外,还有极少量的木糖、3,6-脱水半乳糖和6-甲基-半乳糖.利用鸡胚尿囊膜法(CAM)对GFP15进行抗新生血管生成活性评价,结果显示,GFP15(100μg/egg)能抑制尿囊膜新生血管的形成,提示GFP15作为一种多糖类血管生成抑制剂具有开发为抗肿瘤药物的潜在价值.
文摘Four kinds of polysaccharides (FA, FB, FC and FD) were extracted and purified from a red alga Furcellaria lumbri-calis. Their monosaccharide composition, average molecular mass (Mw) and structural feature were determined by gas chromatog-raphy (GC), high performance gel permeation chromatography (HPGPC) and Fourier transform infrared spectroscopy (FTIR), respectively. The results showed that FA and FB were composed of galactose (Gal), 3,6-anhydro-galactose (AnG) and 4-sulfated-galactose (G4S), which were structurally similar to β-carrageenan and κ-carrageenan. FC was composed of sulfated galactose and small amount of AnG, indicating that it was a hybrid-sulfated galactan. FD was composed of α-1, 4-glucose and belonged to floridean starch. The respective yields of FA, FB, FC and FD were 4.84%,33.74%,8.76% and 13.5%, and the cor-responding Mw were 537 kD, 432 kD, 513 kD and 51 kD respectively. Owning to its high content ( >60%) of polysaccharide, F. lumbricalis will be a good source of marine sulfated polysaccharide and shows its potential utilization in food and medicine.
文摘目的:研究半乳聚糖的快速、高效制备方法,并对产物进行结构分析。方法:在微波辐照下,以半乳糖为底物,氯化钠溶液为引发剂,杂多酸为反应催化剂,催化底物脱水缩合生成半乳聚糖,并通过乙醇沉淀去除催化剂和引发剂,Sephadex G-25葡聚糖凝胶柱分级纯化,高效凝胶渗透色谱分析半乳聚糖的纯度及聚合度,高效阴离子交换色谱分析单糖组成,最后通过红外光谱分析半乳聚糖的构型。结果:半乳聚糖的最优合成条件为引发剂浓度0.25 mol/L、催化剂添加量1.1%、反应温度130℃、微波辐照4.5 min,半乳糖转化率为97.22%。半乳聚糖的平均分子质量为2.853 k D,平均聚合度为17。单糖组成为半乳糖及微量葡萄糖。红外光谱及氢核磁共振波谱(1H-nuclear magnetic resonance,1H-NMR)分析表明半乳聚糖残基以β-构型为主。结论:可以通过微波辐照杂多酸催化的方法快速、高效制备半乳聚糖。
基金supported in part by the International Science and Technology Cooperation Program of China(2007DFA30980)the National High Technology Research and Development Program(2007AA09Z445)the National Natural Science Foundation of China(30870506)
文摘Three kinds of polysaccharides： GFW, GFH and GFA, were sequentially extracted from a red alga Gloiopeltisfurcata with 25℃ and 85℃ water, and 60℃ 4% NaOH water solution. Based on the defatted alga, the yields of the polysaccharide were 57.9%, 2.5% and 2.6%, respectively. Their monosaccharide compositions, average molecular weights and structural characters were determined by gas chromatography （GC）, high performance liquid chromatography （HPLC）, fourier transform infrared spectroscopy （FTIR） or ^13C-NMR spectroscopy. The results showed that GFW, GFH and GFA were all composed of D-galactose （Gal） and 3,6-anhydro-L-galactose （AnG）, and particularly GFA also contained xylose （Xyl）. The average molecular weights of GFW, GFH and GFA were 22.6 kD, 26.5 kD and 49.8 kD, respectively, with the respective sulfate content 31.2%, 25.1% and 22.7%. The data of FTIR and ^13C-NMR confirmed the sulfate ester location at C6 ofgalactose. It is concluded that all the three polysaecharides extracted from Gloiopeltisfurcata were sulfated galactans, two being sulfated-agarose, and one being xylose-containing sulfated galactan.
文摘目的:从霸王花中提取分离和纯化多糖,并对其理化性质、光谱学特征和结构特征进行研究。方法:霸王花经水提醇沉、脱蛋白、冷冻干燥得到水溶性粗多糖(hylocereus undatus polysaccharide,HUP),再通过DEAE-Cellulose 52纤维素柱和Sephadex G-100凝胶柱层析分离纯化,得到1种水溶性均一多糖HUP0。对获得的纯化组分采用傅里叶变换红外光谱(Fourier transform infrared spectroscopy,FT-IR)、高效分子排阻色谱、气相色谱-质谱联用和核磁共振波谱(nuclear magnetic resonance,NMR)等方法进行化学结构分析。结果:经纯化后得到均一的霸王花多糖样品HUP0,分子质量为33.24 k D,特性黏度(η)为47.16 m L/g,比旋度为+69°,平均粒径为196.96 nm;FT-IR图谱结果表明HUP0是中性糖且以β-构型为主;结合高效液相色谱、单糖组成、甲基化分析、NMR对HUP0的结构进行鉴定分析后,表明HUP0为(1→4)-β-D-半乳聚糖。
