共查询到17条相似文献,搜索用时 171 毫秒
1.
金莲花中总黄酮提取工艺的优化 总被引:4,自引:2,他引:2
以黄酮提取率为指标,采用正交实验的方法,对超声波辅助提取和回流提取金莲花中总黄酮的工艺条件进行了优化。结果表明,超声波提取法的优化工艺条件为:以φ(EtOH)=80%的水溶液为提取液,m(金莲花):m(提取液)=1:40,超声提取时间1h,该条件下,金莲花总黄酮提取率为6.21%(n=3);回流提取法的优化工艺条件为:以φ(EtOH)=50%的水溶液为提取液,m(金莲花):m(提取液)=1:40,提取温度60℃,提取时间3h,该条件下,金莲花总黄酮提取率为6.51%(n=3)。方差分析表明,金莲花与提取液质量比对超声波提取影响显著;乙醇体积分数对回流提取影响显著。 相似文献
2.
3.
考察了表面活性剂协同微波提取金莲花黄酮的工艺,筛选出了具有明显增效作用的表面活性剂十二烷基硫酸钠(SDS),最后通过正交实验优化了提取工艺.结果表明,最佳工艺条件为:以质量浓度0.75 g/L的表面活性剂SDS水溶液为提取剂,提取溶剂用量为40 mL/g金莲花,微波功率600 W,温度70℃,提取时间5 min.在该工艺条件下,金莲花黄酮的提取率为5.35%.与溶剂浸提法相比,提取时间显著缩短,金莲花黄酮的提取率提高约30%. 相似文献
4.
5.
目的研究绿茶中两种活性成分表没食子儿茶素没食子酸脂(EGCG)和咖啡碱(CAF)的超声提取动力学过程。方法采用超声波提取,考察提取时间、提取温度、液固比对两种成分提取效果的影响。以二阶动力学为基础,建立两种成分的提取动力学模型。结果建立了超声提取绿茶中EGCG和CAF两种成分的二阶动力学模型方程。得到超声辅助提取EGCG和CAF的较佳条件为:提取时间为25min,提取温度为40℃,液固比为20m L/g。结论超声法提取绿茶中EGCG和CAF的过程符合二阶动力学过程,研究结果可为绿茶有效成分或其它药物成分的超声法提取提供参考。 相似文献
6.
响应曲面法优化蜂胶中的活性黄酮提取 总被引:1,自引:0,他引:1
探讨了超声波辅助技术提取蜂胶中的活性黄酮类化合物的工艺。实验以芦丁为标样,在单因素实验基础上,采用Box-Behnken实验设计方法,以提取温度、固液比、提取时间以及乙醇浓度为自变量,黄酮提取率为响应值,研究各自变量及其交互作用对黄酮提取率的影响。利用Design expert软件,建立了提取率与超声波处理各因素的二次多项式数学模型,获得了蜂胶中黄酮的最佳提取条件为:提取温度51.32℃,固液比1∶10,提取时间12.88 min,乙醇浓度88.86%,最佳黄酮提取率为52.39%。经过实验验证,黄酮提取率可达51.98%。 相似文献
7.
花生壳中黄酮的超声辅助提取工艺研究 总被引:1,自引:0,他引:1
在超声波辅助下,用有机溶剂提取花生壳中的黄酮,以芦丁作为标品检测黄酮的提取率,以乙酸乙酯、乙醇、丙酮为溶剂,研究了提取时间、溶剂体积、超声频率等对提取率的影响。结果表明,超声波提取黄酮的最佳工艺条件是用60%乙酸乙酯为溶剂,提取时间为45 min,超声波频率为80 Hz,此时提取率最高为3.851%。 相似文献
8.
本文以花生油为介质,以过氧化值为指标研究了金莲花中黄酮的抗氧化性能。研究表明金莲花黄酮对食用油脂的氧化有较好的抑制作用,且抗氧化作用随添加量的增加而增强。通过增效实验发现,α-生育酚的增效作用最强,0.02%的α-生育酚与金莲花黄酮共同作用,其抗氧化作用强于0.02%BHT抗氧化效果。 相似文献
9.
10.
11.
12.
金莲花挥发油成分分析及其在卷烟加香中的应用 总被引:1,自引:0,他引:1
分别采用水蒸气蒸馏、同时蒸馏萃取、超声、闪式、先超声后同时蒸馏萃取、先闪式后同时蒸馏萃取6种提取方法提取金莲花挥发油,运用GC-MS分析挥发油的成分,并进行卷烟加香实验。结果表明:金莲花挥发油得率分别为0.20%、0.67%、2.31%、2.67%、0.82%、0.78%,分别鉴定出20、30、19、18、37、30种成分;其中,β-紫罗兰酮、二氢猕猴桃内酯等为主要的香气成分;超声和闪式提取方法虽然挥发油得率高,但是杂质也较多,先超声后同时蒸馏萃取的挥发油优于其他几种。在烟丝中,添加适量金莲花挥发油,能提高卷烟烟气的香气质和香气量,降低刺激性,改善余味,先超声后同时蒸馏萃取的挥发油加香效果最好。 相似文献
13.
14.
《分离科学与技术》2012,47(15):2330-2337
Tanshinone IIA (TS) and cryptotanshinone (CT) are phenolic compounds which show significant biological potential. This study deals with the optimization and kinetics of TS and CT extraction from the rhizome of Salvia miltiorrhiza Bunge in a stirred batch extraction. The influence of various extraction parameters on the extraction yield has been studied. The optimum extraction conditions are 85% ethanol, solid to solvent ratio of 1:20, 333.15 K of temperature, agitation speed of 300 rpm, 0.09 to 0.125 mm of powder size and extraction time 30 min. 2.72 mg and 1.78 mg per gram of the rhizome powder of Salvia miltiorrhiza Bunge for TS and CT are obtained in the optimum extraction conditions, respectively. The extraction kinetics behavior of TS and CT from the rhizome powder of Salvia miltiorrhiz Bunge reveals that the extraction of TS and CT follows the first order kinetics. The kinetic expression developed by Spiro and Siddique is used and the model is in good agreement with the experimental results. The activation energy for the extraction of TS and CT is found to be 16.05 kJ/mol and 18.82 kJ/mol, respectively. 相似文献
15.
The kinetic study of bitumen extraction from oil sands is significant for efficiency improvement and reactor design in industrial applications. Here, an improved pseudo-first-order kinetic model was established with the assumption of a constant Sherwood number, which took into account the mass transfer area. Five organic solvents were used for the extraction kinetics of the prepared bitumen microbeads. The improved pseudo-first-order kinetic model exhibited excellent fitting effects. Petroleum ether/dichloromethane was proved to be the best solvent. The results also showed an exponential decrease in the diameter of the bitumen microbeads and a linear increase in mass transfer coefficients with time for all the solvents. The kinetics of bitumen extraction from oil sands using different solvents were predicted according to the corresponding average mass transfer coefficients. The experimental results confirmed that the improved kinetic model was capable of describing the mass transfer process of bitumen extraction from oil sands. 相似文献
16.
Batch solvent extraction techniques have been widely explored. On understanding its potential significance, this article aims to review kinetics and modeling of various extraction techniques which involve assisted means including microwave-assisted extraction (MAE), ultrasonic-assisted extraction (UAE), pulse electric field (PEF) and high voltage electrical discharge (HVED). This review includes a detailed discussion of the instrumental setup, extraction mechanisms and their distinct advantages and disadvantages. Additionally, the impact of the operating parameters on the extraction kinetics of the mentioned techniques are highlighted. The review also covers the mathematical modeling based on Fick's law, chemical rate law and empirical models. The established kinetic models of various extractions are also summarized to facilitate better understanding. 相似文献