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大孔吸附树脂精制鱼腥草黄酮类化合物 总被引:5,自引:0,他引:5
Flavonoids are one main kind of effective components in Houttuynia cordata Thunb., which display a wide range of pharmacological activity. In this study supercritical fluid extraction (SFE) with carbon dioxide was first used as preparat ion step to remove the volatile components, which are also active components, from Hout-tuynia cordata Thunb. Then ultrasound-assisted extraction was used to obtain the crude flavonoids and the macro-porous resin adsorption technology was further employed to purify the flavonoids. Nine kinds of macroporous resins with different properties were tested through static adsorption, and one macroporous resin labeled as D101 was selected. The effect of several factors, such as the ratio of column height to diameter, initial concentration and pH, on both flavonoids yield and content were explored by dynamic adsorption to obtain reasonable conditions of adsorption and desorption. The experimental results show that the content of fiavonoids can be above 60% with fia- vonoids recovery of 93.3 % under the optimum conditions of purification. HPLC analysis of the final flavonoids product shows it contains quercitrin, hypefin, rutin and quercetin. 相似文献
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采用大孔吸附树脂对PTA废水进行处理,对吸附树脂进行了初步筛选,研究吸附操作的工艺条件对吸附效率的影响。结果表明,HPD-950型大孔树脂对PTA精制废水具有较强的处理能力。试验同时通过静态试验考察得出了较佳的操作条件:树脂加入量为8 g/L、振荡时间为2.5 h、吸附温度为25℃、振荡强度为200 r/min和pH为4。通过动态试验考察了工业化所关注的停留时间,运行时间和再生时间对树脂吸附效果的影响,得出了最佳的操作条件为:停留时间为30 min、运行时间为50 h、再生时间为30 min。 相似文献
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大孔吸附树脂对绞股蓝黄酮类化合物的精制工艺研究 总被引:8,自引:0,他引:8
研究了DM-130型大孔吸附树脂对绞股蓝黄酮类化合物的吸附性能.结果表明最佳富集精制条件为:浸出液的pH值为4.00,浸出液与树脂的液固质量比为15:1,过柱流速为0.5 mL/min,洗脱剂为70%的乙醇水溶液,洗脱剂与树脂的液固质量比为7:1,黄酮得率为3.75%,提取率可达89.8%. 相似文献
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在过硫酸铵的引发下,使丙烯酸在羧甲基壳聚糖的分子链上接枝聚合,以N,N’-亚甲基双丙烯酰胺为交联剂,并加入NaHCO3为致孔剂,制得具有大孔结构的羧甲基壳聚糖接枝聚丙烯酸(CMCTS-g-PAA)高吸水性树脂。采用Voigt模型成功地对树脂的溶胀动力学进行了模拟,并确定了模型中的各参数在高吸水树脂溶胀过程中的意义。通过溶胀动力学及SEM的表征,研究讨论了致孔剂的加入量,致孔剂加入时间与聚合物的凝胶过程的配合等因素对所合成树脂的表面形貌和吸水速率的影响。 相似文献
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Glycyrrhizic acid (GA) is the major active ingredient of licorice which has many pharmacological activities. In the present study, separation of GA from licorice root extract has been carried out by adsorption on five different macroporous resins. Static and dynamic adsorption of GA from crude licorice root extract is studied on ion exchange resins followed by desorption. Indion 810 shows the maximum adsorption as well as desorption capacity. The adsorption experiments indicate that equilibrium can be achieved in 360 min. The adsorption equilibrium data is well fitted in the Langmuir isotherm. The separation process is optimized by investigating the effect of pH on adsorption capacity and effect of concentration of ethanol on desorption capacity. The dynamic adsorption is carried out in a column packed with Indion 810 resin and effect of feed flow rate and initial concentration of GA in extract has been studied. The results showed that increase in feed flow rate as well as initial feed concentration of GA lowers the dynamic binding capacity and mass transfer coefficient while increases the HETP. The purity of GA is increased from 14.3% to 71.5% by the dynamic desorption with 60% ethanol. Indion 810 resin can efficiently separate GA from licorice root extract with the HPLC recovery of 63.6%. This study forms the basis for large scale preparation of GA by resin adsorption. 相似文献
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对甲基苯甲酸在大孔吸附树脂上的吸附热力学及动力学研究 总被引:3,自引:0,他引:3
研究了对甲基苯甲酸在NDA-1800和JX-101大孔吸附树脂上的静态吸附热力学和动力学行为。结果表明,在283~313 K和研究的浓度范围内,两种大孔吸附树脂吸附对甲基苯甲酸的行为符合Freundlich吸附等温方程。对甲基苯甲酸在两种大孔吸附树脂上的吸附焓变△H〈0,为放热过程;自由能变△G〈0,吸附过程能自发进行;吸附熵变△S〈0,这是因为吸附质分子从水溶液中被吸附到树脂表面后,其分子运动受到了限制,使吸附熵减少。两种大孔树脂吸附对甲基苯甲酸的速率常数都比较大,且随着温度的升高而增大。吸附活化能都比较低,吸附较容易进行。 相似文献
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大孔树脂分离纯化葡萄籽原花青素的研究 总被引:1,自引:0,他引:1
本文研究了大孔树脂分离纯化葡萄籽提取物中原花青素的方法。先对5种大孔吸附树脂用静态筛选方法选择HPD100和HPD400树脂,进一步以动态吸附与解吸附实验比较了两种树脂对葡萄籽提取物原花青素的吸附与洗脱效果。结果表明:HPD100、HPD400树脂对葡萄籽提取物中原花青素的动态饱和吸附量分别为101.2和92.1mg·g-1,乙醇洗脱的总洗脱率分别为96.5%和92.0%;其中30%乙醇洗脱样品中原花青素含量分别为74.8%和85.0%;50%乙醇洗脱样品中原花青素含量分别为70.0%和73.9%。与HPD100相比较,HPD400更适合葡萄籽原花青素的分离与富集。 相似文献
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通过对比5种大孔树脂对黄芪异黄酮的吸附和解吸特性,发现X-5大孔树脂最适用于吸附黄芪异黄酮,并进一步采用静态吸附法研究了X-5树脂对黄芪异黄酮的吸附动力学和热力学特性。动力学研究表明,准二级动力学相对于其它模型而言能够更好地描述黄芪异黄酮的吸附过程,颗粒内扩散是整个吸附过程的主要速率控制步骤;黄芪异黄酮的吸附符合Langmuir等温吸附模型。热力学研究表明,ΔG0<0即吸附是自发进行的,ΔH0和ΔS0分别为8.021 kJ/mol和62.51 J/(mol?K)说明X-5大孔树脂对黄芪异黄酮的吸附是以熵为主要驱动力的吸热 过程。 相似文献