黄芪超微粉吸附胆固醇的热力学与动力学研究  

Dynamics and Thermodynamics of Adsorption of Cholesterol on Superfine Powder of Astragalus membranaceus Radix

作　　者：张荣[1] 徐怀德[1] 姚勇哲[2] 陈华瑞[1] 

机构地区：[1]西北农林科技大学食品科学与工程学院,陕西杨凌712100 [2]西北农林科技大学园艺学院,陕西杨凌712100

出　　处：《食品科学》2012年第17期112-117,共6页Food Science

摘　　要：研究黄芪超微粉与胆固醇溶液的料液比、吸附时间、黄芪超微粉粒径、胆固醇溶液初始质量浓度和温度对黄芪超微粉吸附胆固醇的影响,并对该吸附的动力学和热力学进行了分析。结果表明:黄芪超微粉吸附胆固醇的适宜条件为:料液比1:30(m/V)、吸附时间60min、胆固醇质量浓度1.50mg/mL、温度25℃。该条件下,黄芪超微粉对胆固醇的吸附容量最大,达15.60mg/g。黄芪超微粉对胆固醇的吸附是以物理吸附为主的自发吸附,吸附易于进行。在胆固醇质量浓度较低时,吸附以表面吸附为主,当胆固醇质量浓度升高时,吸附以表面吸附和颗粒内扩散为主。In this study, the effects of superfine powdered Astragalus membranaceus radix-to-cholesterol solution ratio, adsorption time, particle size of superfine powdered Astragalus membranaceus radix, initial cholesterol concentration and temperature on the adsorption of cholesterol on superfine powdered Astragalus membranaceus radix. Meanwhile, the adsorp- tion process was dynamically and thermodynamically analyzed. Good results were obtained after 60 min adsorption of 1.50 mg/mL cholesterol solution by superfine powdered Astragalus membranaceus radix at ratio of 1：30 （m/V） and 25 ℃. Under these conditions, the maximum adsorption quantity was 15.60 mg/g. Therefore, the adsorption process is a spontaneous process in which physical adsorption is dominant and easily occurs. Furthermore, surface absorption was dominant at low cholesterol concentrations, but both surface adsorption and intraparticle diffusion were dominant at high cholesterol concentrations.

关 键 词：黄芪超微粉 胆固醇 吸附条件 动力学 热力学 

分 类 号：R282.6[医药卫生—中药学]