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研究了新疆红花黄色素的分离与提取、纯化与鉴定等工艺条件。以羟基红花黄色素A的提取率为考查指标,采用单因素实验法研究了溶剂的种类、用量、提取温度、提取时间与提取次数等因素对红花黄色素提取率的影响。采用硅胶柱层析法对红花色素进行纯化。HPLC和UV对单因素处理的分析结果表明,处理样品与10%乙醇提取液的料液比为1:50(m/v)、提取温度为60℃、提取次数为2次、提取时间为50min为最优提取工艺条件。获得的红花黄色素提取液经冷冻干燥后,以乙醇:丙酮:水=3:2:1配比进行硅胶柱层析,分离获得了以羟基红花黄色素A为主的两种红花黄色素纯化产物。 相似文献
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单因素试验分析和正交试验确定微波辅助提取连翘花黄色素的工艺条件,Fenton法测定连翘花黄色素的抗氧化活性。结果显示,影响色素提取的因子依次为提取时间提取剂浓度微波功率料液比,提取的最佳条件为B2D3A3C2,即使用95%vol乙醇,以料液比1∶40,微波功率700W,每次提取时间40s。以此工艺条件提取连翘花黄色素,产率为10.54%,黄色素的95%vol乙醇溶液在可见光区的最大吸收波长为410nm,该色素溶液还原力强,具有清除.OH的能力,在色素浓度为10.0mg/mL时,对.OH的清除率为97.67%。 相似文献
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超声萃取沙棘籽油的研究 总被引:2,自引:0,他引:2
以出油率为评价指标,考察了萃取溶剂、时间、温度、液固比和超声波功率等方面对出油率的影响.在单因素实验基础上,通过正交试验得出优化工艺条件:乙酸乙酯为提取溶剂,时间为15min,液固比为40mL/g,温度为60℃,功率为90W.最后与索氏提取法、微波萃取法作了对比分析,结果表明,超卢萃取法耗能低,消耗溶剂少,出油率高. 相似文献
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采用单因素和正交试验设计,应用微波辅助溶剂浸提法提取转心乌洋芋皮天然红色素,对影响色素收率的微波功率、微波时间、提取料液比等主要因素进行了优化组合试验,以确定最佳提取条件。通过试验比较了色素收率结果表明:在微波功率、微波时间、提取料液比三因素中,微波功率对色素收率影响最大,其次是微波时间,提取料液比的影响较小。单因素和正交试验结果确定的最佳工艺组合为:1%HCl水溶液为提取溶剂,微波功率400W,微波时间15min,提取料液比为1:10(g/mL)。在此试验条件下,平行试验3次,转心乌洋芋皮红色素平均收率可达86.79%,与传统溶剂浸提法相比,红色素收率可提高15.85%,微波辅助溶剂浸提法能高效提取转心乌洋芋皮中天然红色素。 相似文献
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微波技术提取海带叶绿素及其铜钠盐的制备 总被引:1,自引:0,他引:1
叶绿素是一种天然的、安全、无毒并具有一定生理功能的脂溶性天然色素,而叶绿素铜钠盐是由叶绿素经化学处理转变而来的.叶绿素铜钠盐具有色泽亮丽、性质稳定、使用安全等特点.本试验以海带为原料,以95%乙醇为浸提溶剂,采用微波技术提取海带中的叶绿素.以海带与浸提溶剂的料液比、微波作用时间、温度、微波功率作为影响因素进行单因素试验,通过分析确定了单因素的最佳实验条件.采用正交实验设计,优化海带叶绿素的提取条件,并将叶绿素提取液浓缩,皂化铜代,与碱反应成盐,干燥,制备叶绿素铜钠.结果表明,温度是影响提取效果的重要因素,其次为微波作用时间,而微波功率为不重要因素,最佳提取工艺参数为:海带与浸提溶剂的料液比为1g ∶ 2OmL,微波作用时间6min,微波功率300w,温度60℃.该方法与传统加热提取方法相比,具有高效、快速、节约能源等优点.由叶绿素提取液制备叶绿素铜钠,得率为4.53%. 相似文献
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超临界萃取技术的应用研究进展 总被引:16,自引:0,他引:16
综述了超临界萃取技术的原理、特点及其在食品和医药中的研究进展,并介绍了超临界萃取技术在天然香料、色素的生产条件,油脂的提取分离,中药有效成分的提取,并对今后的发展趋势作了预测。 相似文献
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茶饮料浸提工艺的微波辅助萃取(MAE)应用研究 总被引:4,自引:0,他引:4
浸提工艺是茶饮料生产过程一个关键生产工艺。本文比较了传统热水浸提工艺和微波辅助萃取工艺之间的最优工艺参数,并利用高效液相色谱分析方法研究了微波萃取对茶多酚浸出得率和单体组成的影响,表明微波萃取技术(Microwave-assisted extraction,MAE)可应用在茶饮料生产中,而且比传统热水浸提工艺省时节能。结果表明:传统热水浸提工艺的最优浸提温度90℃、时间43min、液固比20:1,茶多酚的得率为19.76%;微波辅助萃取工艺的最优浸提功率360W、时间3、5min、液固比25:1,茶多酚的得率为20.63%。微波短时处理茶叶不会对茶多酚的结构和单体组戍产生破坏性影响。 相似文献
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Extracts of aromatic plants contain bioactive substances such as phenolic compounds, which could be used as natural antioxidants. Conventional, as well as ultrasonically assisted extractions (UAEs ) of phenolic compounds from aromatic plants using different solvents, have been studied. Reversed phase high performance liquid chromatography (RP‐HPLC ) with ultraviolet detection was employed for the analysis of phenolic compounds. Total phenolic compounds were determined by the Folin–Ciocalteu assay. The amount of extractable phenolic substances for this method decreased with decreasing polarity of the solvent in the order water, 60% methanol, 60% acetone, and ethyl acetate/water (60:30, v/v). The HPLC results indicate that UAE is a more effective technic compared to the conventional method but was dependent on the solvent and the temperature employed. Increasing the temperature of sonication, the efficiency of extraction of phenolic compounds for all solvents is enhanced. However, water extraction was found to give reduced amounts of phenolic compounds when compared with the conventional method. 相似文献
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Curcuma longa L. is a common species among the aromatic plants in Brazil. The roots are used in dairy food as colorant and flavoring substitute for saffron. Turmeric (C. longa L.) contains curcuminoids that have antimutagenic and antioxidant activities, and is thus used for the formulation of foods for the prevention of cancer. Turmeric extracts rich in curcuminoids were obtained using a mixture of CO2 and EtOH/IsoC3, and the assays were performed in a fixed bed extractor at 300 bar, 303 K. The bed's height effect was studied, maintaining constant the bed diameter and porosity; for the accelerated solvent extraction, the cosolvent percentages used were 10, 50 and 90% (v/v), with or without a static period of 30 min. The curcuminoid content was monitored using a spectrophotometer; the volatile oil was analyzed by gas chromatography‐flame ionization detector, and the extract chemical profile was observed by thin‐layer chromatography. The overall extraction curves showed that by keeping the relation between solvent and raw material constant, maximum extraction yield was obtained in a shorter time using the lowest bed height (HB/DB = 1.8). The supercritical fluid extraction using 50% of the cosolvent that employed the static period increased the curcuminoid content (0.72% of curcuminoids) and reached ~10% of extract yield. 相似文献