Ca2+-槲皮素共振瑞利散射法测定废水中阳离子表面活性剂的含量

研究在十六烷基三甲基溴化铵(CTAB)和十六烷基氯化吡啶(CPC)存在下,Ca2 -槲皮素(Qu)-表面活性剂体系的共振瑞利散射(RRS)光谱。结果表明,由于三元胶束配合物的形成,体系RRS峰强度急剧增强。最大RRS峰分别位于471 nm(CTAB)和489 nm(CPC)。CTAB和CPC浓度均在1×10-7mol/L~2×10-5mol/L,与RRS强度成正比。考察其相应的光谱特征、影响因素、适宜的反应条件及共存离子的影响。     

绿色低共熔溶剂提取野菊花中黄酮类化合物

研究氯化胆碱低共熔溶剂(DES)提取野菊花中的总黄酮、总槲皮素和槲皮苷.首先,合成了4种性能优异的DES,并对其物理性质进行表征.其次,以提取效果最好的氯化胆碱/尿素DES为溶剂,通过改变单一变量优化提取效果,在含水量30％、提取时间45 min、固液比1:50(g:mL,下同)、提取温度60℃的条件下,总黄酮、总槲皮...     

荨麻中槲皮苷提取工艺的研究

对荨麻中槲皮苷的乙醇提取工艺进行了研究。用HPLC法测定槲皮苷含量,通过L9(34)正交试验,优选了工业参数。结果表明:对提取效果影响因素依次为乙醇体积分数>料液比>浸提温度>浸提时间。最佳提取工艺条件是:体积分数70%乙醇、料液比1:30、浸提温度80℃,浸提时间3h,提取率为211mg/kg。     

Isolation and Purification of Isoquercitrin and Quercitrin from sf Hypericum Japonicum Thunb.ex Murray by Counter-Current Chromatography

Isoquercitrin and quercitrin were successfully isolated and purified from Hypericum japonicum Thunb.ex Murray by counter-current chromatography with a solvent system of n-hexane-ethyl acetate-methanol-water (1:7:1:7, v/v/v/v) in one step. From 100 mg of the extract of Hypericum japonicum Thunb.ex Murray, 9.8 mg of isoquercitrin and 12 mg of quercitrin were obtained with the purities of 95.9% and 99.1%, respectively, as determined by HPLC. Their structures were identified by UV, MS, and NMR analysis. In this study, a rapid method for isolation and purification of the two major compounds from Hypericum japonicum Thunb.ex Murray crude extract was established.