Adsorptive Thermodynamic Properties and Kinetics of trans-1,2-Cyclohexandiol onto AB-8 Resin

AB-8 resin was used as an adsorbent for the removal of trans-1,2-cyclohexandiol(CHD) from aqueous solutions.Batch experiments were carried out to investigate the effect of contact time and temperature on sorption efficiency.The adsorptive thermodynamic properties and kinetics of CHD from water onto AB-8 resin were studied.The Langmuir and Freundlich isotherm models were employed to discuss the adsorption behavior.Thermodynamic parameters such as G,H and S were calculated.The results indicate that the equilibrium data are perfectly represented by Langmuir isotherm model.Thermodynamic study reveals that it is an exothermic process in nature and mainly physical adsorption enhanced by chemisorption with a decrease of entropy process.The kinetics of CHD adsorption is well described by the pseudo second-order model.The adsorbed CHD can be eluted from AB-8 resin by 5% ethanol aqueous solution with 100% elution percentage.

溶剂萃取法提取蓝莓中花色苷

1引言蓝莓（Blueberry）,又称越橘、蓝浆果,属杜鹃花科（Ericaceae）越橘属（Vaccinium spp）多年生落叶或常绿灌木。蓝莓果实呈深蓝色,含有丰富的花色苷。花色苷是花色素与糖以糖苷键结合而成的黄酮多酚类化合物,结构性质稳定,花色素的基本结构为3,5,7-三羟基-2-苯基苯并吡喃,由于苯环中取代基、羟基和甲氧基位置和数量不同,

双柏炎痛喷雾剂和侧柏叶精制部位中槲皮苷成分比较

目的:探讨提高双柏喷雾剂中槲皮苷转移率的方法。方法:采用水提醇沉法制备双柏喷雾剂,采用大孔树脂法制备侧柏叶精制部位,通过测定槲皮苷含量进行比较。结果:通过大孔树脂精制技术得到的侧柏叶精制部位槲皮苷含量为0.49mg/mL,转移率为77%;双柏喷雾剂槲皮苷含量为0.44mg/mL,转移率为35%。结论:采用大孔树脂精制侧柏叶,可使药材利用率提高约1倍。