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亚临界水萃取紫草中左旋/右旋紫草素的工艺优化 总被引:2,自引:0,他引:2
研究了亚临界水萃取技术富集紫草中左旋/右旋紫草素的工艺过程,采用响应曲面法对影响紫草素提取率的工艺参数进行分析优化.考察了萃取温度、萃取时间和固液比对紫草素提取率的影响,结果发现三个因素在各自考察的实验范围内均有显著影响.采用可见分光光度法对亚临界水提取液中紫草素的浓度进行分析,在510 nm波长下测得的标准线性方程为y=24.77x+0.0311,相关系数为0.9905,紫草素浓度的线性范围是0.0084~0.0540 mg·mL-1.响应曲面分析模型预测的最佳提取条件是:固液比为7.875 g·L-1,在20 MPa、117.5℃下提取18 min,此时紫草素最大提取率是2.02 mg·g-1,与模型预测值基本相符.采用亚临界水萃取紫草素具有高效、环保、操作简便等优势,利用响应曲面设计能够有效地优化萃取过程,为该技术的推广提供了一定的理论支持. 相似文献
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亚临界水中大豆渣水解制备氨基酸工艺研究 总被引:1,自引:0,他引:1
豆渣是大豆加工过程中的主要副产物。今在亚临界水中对豆渣水解制备氨基酸的生产工艺进行了研究,为大豆的综合利用开辟了一条新的途径。利用氨基酸分析仪对水解产物中的氨基酸进行定性和定量分析,实验结果发现,大豆渣水解后可得到17种氨基酸。考察了反应温度、反应时间、物料浓度以及CO2分压对氨基酸总收率的影响,并进行正交试验。研究结果表明,亚临界水解法高效快速,工艺简单,CO2气体的加入有利于增加氨基酸总收率,较佳的水解工艺条件为:T=200℃,P(CO2)=3.0 MPa,w=5.0 mg mL 1,t=15 min,氨基酸的总收率为14.25%。 相似文献
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《分离科学与技术》2012,47(10):1433-1439
An ultrasonic probe was introduced into the kettle of subcritical water extraction device to extract volatile oil from Lithospermum erythrorhizon. The effect of temperature, pressure, ultrasonic power, and frequency on the extraction yield was studied. Gas chromatography-mass spectrometry (GC-MS) was applied to the analysis of the compositions of volatile oil. The mechanism of ultrasonic enhanced subcritical water extraction (USWE) was discussed. The results showed that the ultrasound-assisted enhancement effect of 20 KHz was better than that of 36 KHz and increased with output power (0 ~ 250 W). The subcritical water extraction yield increased from 1.87% to 2.39% via ultrasonic oscillation (250 W, 20 KHz) at a temperature of 160°C and a pressure of 5 MPa in the 25-minute extraction. Nineteen components were identified chiefly consisting of 18 carbon unsaturated fatty acid methyl esters, hexadecanoic acid methyl ester and pentadecane. Mechanism of USWE was cavitation and mechanical effect. 相似文献
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亚临界水提取干花椒中精油的研究 总被引:3,自引:0,他引:3
采用亚临界水提取技术从干花椒中提取花椒精油.考察了原料颗粒度、提取时间、提取温度等因素对花椒精油提取得率的影响.确定亚临界水提取花椒精油的最佳工艺为:原料颗粒度0.5 mm、提取时间40 min、100~150℃的连续程序升温、压力5 Mpa,在此条件下花椒精油的提取得率为5.42%.同时,对亚临界水提取所得的花椒精油进行了抗氧化实验,并与常用抗氧化剂BHT和BHA进行了对比.结果表明,亚临界水提取所得的花椒精油具有较好的抗氧化性.用亚临界水提取技术提取花椒精油具有效率高、能耗低的优点. 相似文献
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The present study was conducted to develop subcritical water extraction (SWE) of Echinacea purpurea flowers. The influence of temperature and extraction time on quality of extracts considering total phenols content, total flavonoids content, antioxidant capacity and extraction yield, was determined. Optimized extraction parameters for maximised investigated responses were as follows: 147.56 °C and 8.43 min. The experimental values agreed with the values predicted, thus indicating the adequacy of central composite experimental design for modelling the SWE of bioactive compounds from E. purpurea. Results of the study also highlighted the potential application of E. purpurea subcritical water extracts as a source of valuable bioactive compounds. 相似文献
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Extraction of cottonseed oil using subcritical water technology 总被引:1,自引:0,他引:1
Wael Abdelmoez Rehab Abdelfatah Aghareed Tayeb Hiroyuki Yoshida 《American Institute of Chemical Engineers》2011,57(9):2353-2359
This work represents the extraction of cottonseed oil using subcritical water. The extraction efficiencies of different range temperatures (180–280°C), having mean particle size range from 3 mm to less than 0.5 mm, water:seed ratios of 0.5:1, 1:1, and 2:1, and extraction times in the range of 5–60 min were all investigated. The composition of the extracted oil, using the subcritical water, was analyzed by gas‐liquid chromatography and compared with that extracted using traditional hexane extraction. The results showed that the optimum temperature, mean particle size, water:seed ratio, and extraction time were 270°C, <0.5 mm, 2:1, and 30 min, respectively. In addition the extracted oil was identical to that extracted using the traditional hexane method. © 2010 American Institute of Chemical Engineers AIChE J, 2011 相似文献
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以葡萄酒厂副产品葡萄籽为原料,石油醚(30~60℃)为浸提剂,利用索氏提取器提取葡萄籽油。考察了粉碎粒度、料液比、浸提浴温、浸提时间对葡萄籽油提取率的影响。结果表明:葡萄籽粉碎粒度为60目,料液比(g/mL)1∶6,浸提浴温80℃,浸提时间120 min时葡萄籽精油提取率为14.86%。实验制得葡萄籽油理化指标均符合国家食用油标准。 相似文献
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《分离科学与技术》2012,47(4):616-624
Active compounds, terpinene-4-ol and (E)-1-(3,4-dimethoxyphenyl) butadiene (DMPBD), displaying anti-inflammatory activity, were successfully extracted from the rhizome of Zingiber cassumunar Roxb. by pressurized liquid extraction (PLE) using methanol or ethanol and by superheated water extraction (SWE). Optimum conditions of both techniques were 1 mL/min flow rate and 5 min static time. The extraction temperature and dynamic time of the PLE and the SWE were 100°C 5 min and 140°C 20 min, respectively. Compared with water distillation, solvent sonication, and Soxhlet extraction, the PLE produced the highest amount of DMPBD and terpinene-4-ol, whereas the SWE and water distillation provided similar results. 相似文献
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为了回收利用葡萄酒酿造过程产生的副产品中的有效成分,本文利用超临界CO2萃取技术从葡萄籽中提取含有不饱和脂肪酸的葡萄籽油,意在考量超临界CO2技术在萃取葡萄籽油方面的作用。设计单因素实验,研究了萃取压力、萃取温度、CO2流量以及停留时间对葡萄籽油萃取率的影响。单因素实验结果表明萃取压力对萃取结果的影响最为显著。萃取温度和CO2流量对萃取率的影响都存在最佳值,当温度和流量超过最佳值,萃取率开始降低。在单因素实验的基础上进行响应面实验,采用中心复合设计进行实验方案设计以优化萃取葡萄籽油工艺。对响应面实验结果进行方差分析,建立多元回归模型,模型P值<0.0001,预测超临界CO2萃取葡萄籽油的最佳萃取条件为:萃取压力28MPa、萃取温度321 K、CO2流量15.5L/h,停留时间155min,萃取率达到14.12%。 相似文献