何首乌中二苯乙烯苷的醇提工艺

探索了从何首乌中提取二苯乙烯苷的工艺流程。在比较不同提取方法的基础上 ,确定选用乙醇为提取溶剂。通过单因素和中心组合实验 ,对影响何首乌中二苯乙烯苷提取的因素进行了探讨和研究 ,运用响应面分析法确定了提取工艺的最优化条件 :料液比 (g∶mL)为 1∶9,提取时间为66min ,乙醇体积分数为 61 1 % ,提取次数为 2次。在此条件下 ,二苯乙烯苷的得率可达 6 3 9%。     

大孔吸附树脂对虎杖中自藜芦醇吸附性能的研究

本文研究了多种大孔吸附树脂对白藜芦醇的吸附与脱附性能,从中选出H103树脂具有较大吸附量和解吸率.动态吸附实验研究了提取液浓度、pH、流速对H103树脂吸附量的影响,适合的上柱浓度为0.7157mg/ml,上柱液的pH为4.10,上柱液流速为2BV/h.4倍树脂床体积的80%乙醇以1BV/h的流速进行洗脱即可基本将白藜芦醇完全从H103树脂上解吸下来.     

Antioxidant and antimicrobial activities of Polygonum cognatum Meissn extracts

The antioxidant activities, reducing powers, 2,2‐diphenyl‐l‐picrylhydrazyl (DPPH) radical‐scavenging activities, total phenolic compound contents and antimicrobial activities of ether, ethanol and hot water extracts of Polygonum cognatum Meissn were studied in vitro. The highest antioxidant activity was found in the water extract. However, there were no statistically significant differences among 15 µg ml^?1 extract‐containing samples in linoleic acid emulsion (0.02 M , pH 7.0) during 120 h of incubation (P > 0.05). The reducing power of the water extract was the highest, but its reducing power was markedly lower than that of ascorbic acid. The highest DPPH radical‐scavenging activity was found in the water extract, with 50% DPPH radical scavenging at a concentration of 100 µg ml^?1 dried water extract, while at the same concentration of dried ethanol extract the value was 12%. Surprisingly, no DPPH radical‐scavenging activity was observed in the ether extract. The concentrations of phenolic compounds found were 0.48, 0.50 and 0.01 µg ml^?1 gallic acid equivalent in 10 µg ml^?1 water, ethanol and ether extracts respectively. The ether and ethanol extracts showed antimicrobial activity against Staphylococcus aureus and Bacillus subtilis. The water extract did not show antimicrobial activity against the studied micro‐organisms. © 2002 Society of Chemical Industry     

大孔吸附树脂法分离纯化白藜芦醇的研究

利用大孔吸附树脂分离纯化虎杖中的白藜芦醇。实验结果表明，NKA-9型大孔吸附树脂对白藜芦醇的吸附、解吸性能较好。在料液浓度3-4mg／ml，上柱速率1ml／min，上样量0．5BV，pH值为4的条件下吸附；解吸采用75％酒精，解吸流速1ml／min，pH值为8时可以将白藜芦醇较好的纯化。     

聚丁二酸丁二醇酯/虎杖提取物抗菌材料的界面作用及性能

对具有抗菌作用的植物虎杖进行提取,并与聚丁二酸丁二醇酯(PBS)复合制备了PBS/虎杖提取物(PBS/PCSZ)抗菌材料。采用红外光谱对复合材料进行了表征,研究了复合材料的结晶性、亲水性、热稳定性、力学性能及抗菌性能,通过分子模拟揭示了复合材料的界面作用。结果表明,虎杖提取物赋予了PBS美丽的色彩,但对PBS的晶型没有影响。其作为成核剂参与了PBS的结晶过程,且使得复合材料亲水性增强。红外光谱得出提取物与PBS发生了分子间作用,热稳定性、力学性能的变化证明了该作用的存在。分子模拟显示虎杖提取物与PBS形成C=O…H-O,增强了二者间的界面结合力。不同比例复合材料均具有良好的抗菌能力,PBS/PCSZ 9%具有强抗细菌作用。     

酸模叶蓼和绵毛酸模叶蓼中脂肪酸的研究

用索氏提取法提取脂溶性成分,GC-MS联用法结合计算机检索,首次对酸模叶蓼及其变种绵毛酸模叶蓼的脂肪酸成分进行了分离和鉴定。从酸模叶蓼和绵毛酸模叶蓼中各分离鉴定出21个和13个化合物,分别占峰面积的63.26%和74.73%,其中,脂肪酸成分占53.53%和35.58%,甾类成分占9.73%和39.15%。用峰面积归一化法测定了各成分的相对质量分数,酸模叶蓼中主要成分为:花生酸(11.82%),亚麻酸(10.36%),棕榈酸(9.79%),亚油酸(8.51%),22,23-二氢豆甾醇(5.88%),γ-谷甾醇(3.85%),山嵛酸(3.15%),木蜡酸(2.6%)。绵毛酸模叶蓼主要成分为:γ-谷甾醇(20.61%),22,23-二氢豆甾醇(18.54%),亚油酸(10.41%),棕榈酸(7.42%),油酸(7.50%),花生酸(3.21%),硬脂酸(2.38%)。该文报道工作的新颖性,已为河南大学图书馆2008年9月9日出具的第CX2008008号《科技查新报告》所证实。     

虎杖果实中白藜芦醇与大黄素提取工艺优化及其与3类根茎含量比较

目的：研究虎杖果实中白藜芦醇与大黄素提取工艺,比较其果实与雄株、未结果雌株、结果雌株3 类根茎中白藜芦醇与大黄素得率。方法：采用高效液相色谱法测定其果实与3 类根茎中白藜芦醇与大黄素含量,确定果实中白藜芦醇与大黄素提取的溶剂与方法,采用正交试验法考察微波火力档、溶剂体积分数、料液比及提取时间对提取工艺的影响,确定微波辅助提取的最佳提取工艺,比较虎杖果实、3 类根茎中二者得率。结果：正交试验与方差分析得出果实中白藜芦醇与大黄素的最佳提取条件为乙醇体积分数70%、料液比1∶20（g/mL）、额定功率800 W微波炉先40火力处理3 min冷却后60火力处理3 min、提取时间6 min,高效液相色谱法测得虎杖雄株、未结果雌株根茎中的白藜芦醇与大黄素得率均高于结果雌株根茎及果实,果实及3 类根茎中白藜芦醇与大黄素得率均超过《中国药典》（2010）规定值,提取工艺合理、稳定、可行,虎杖果实具备开发利用的价值。     

罗丹明B-Fe^2＋-H2O2光度法测定两种中药对羟基自由基的清除作用

用Fenton反应产生羟基自由基,羟基自由基使罗丹明B的吸光度发生变化,加入中药的水提物可部分清除溶液中的羟基自由基,通过测定加入中药前后△A值的变化,可间接测定中药对羟基自由基的清除率。分别研究两种中药生首乌和当归及两者协同清除羟基自由基的活性作用,结果表明两种提取物的混合液对羟基自由基的清除率达65.2%,有较好的增效作用。     

Allelopathic effects ofPolygonum aviculare L.

We previously reported thatPolygonum aviculare has a strong allelopathic action againstCynodon dactylon (L.) Pers. and other test species. Moreover, we found that several phenolic compounds appeared to be important allelochemics in this activity. We have now isolated other potential inhibitors fromP. aviculare residues and soil underPolygonum stands, and none of these occurred in soil underC. dactylon stands. GC-MS analysis revealed that these additional inhibitors are long-chain fatty acids with 14–22 carbons. Nine were identified inP. aviculare residues and seven in soil underP. aviculare. Sodium salts of all the identified fatty acids inhibited seedling growth ofC. dactylon and at least some test strains of the nitrogen-fixing bacteria,Azotobacter andRhizobium.