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超声波提取竹叶挥发油优化工艺研究 总被引:2,自引:0,他引:2
采用超声波提取法对青竹叶中的挥发油提取条件进行了研究,通过正交试验得出,超声波提取提取法的最佳条件为乙醇浓度为95%,料液比为1:20,超声波功率为250W,超声时间为30min。 相似文献
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超声波法提取橘皮中黄酮物质的研究 总被引:2,自引:0,他引:2
本文研究在超声波的作用下,用乙醇溶液提取橘皮中的黄酮物质。最佳提取工艺条件为:超声波功率为150W、超声时间为20min、乙醇浓度为70%、料液比为1:20时,黄酮提取率可以达0.1174%以上。 相似文献
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亚麻籽胶微波辅助提取与热水浸提方法比较研究 总被引:1,自引:1,他引:0
本研究通过单因素和正交优化试验分别确定了热水浸提与微波辅助提取两种方法提取亚麻籽胶的最佳工艺条件。结果表明,热水浸提法提取亚麻籽胶的最佳工艺为:温度80℃、时间6 h、料液比1:10、提取次数1次;该条件下亚麻籽胶得率为7.28%,所得的亚麻籽胶中,多糖质量分数为68.13%,蛋白质质量分数为10.21%。微波辅助提取的最佳工艺为:温度80℃、时间1 h、料液比1:10、输出功率600 W、搅拌速度900r/min、提取次数1次;该条件下亚麻籽胶得率为6.46%,其中多糖质量分数为63.13%,蛋白质质量分数为13.75%。通过扫描电镜对提胶前后亚麻籽表面微观形态分析表明,胶液的溶出会破坏亚麻籽表面,微波处理对亚麻籽表层结构破坏大于热水浸提。红外吸收光谱分析表明,所得提取物在1 410 cm~(-1)的C-H变角振动和2 930 cm~(-1)的C-H伸缩振动以及1 039 cm~(-1)的O-H变角振动,构成了糖环的特征吸收峰,证明获得的亚麻籽提取物为亚麻籽胶。 相似文献
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超临界CO2流体萃取芦荟大黄素的研究 总被引:1,自引:0,他引:1
研究了超临界流体萃取芦荟中的芦荟大黄素的工艺,考察了萃取温度、压力和时间对芦荟大黄素萃取率的影响。结果表明,分离釜的温度、压力和CO2流量对萃取效率影响较小;最佳萃取条件为:静萃取时间为60min、动萃取时间为30 min、萃取压力25 MPa、萃取温度30℃、乙醇用量250 mL/100g,在此条件下芦荟大黄素的萃取量达3.83 mg/100g。 相似文献
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Kurosaki H Loyland Asbury SM Navratil JD Clark SB 《Environmental science & technology》2002,36(22):4880-4885
Sequential extractions of contaminants from a soil or sediment have been shown to be cost-effective contaminated site assessment tools that provide information on contaminant partitioning within an environmental matrix. Such information is necessary for defining remediation alternatives and mitigation strategies. The typical sequential extraction approach involves a batch method, and known limitations include the possibility of contaminant readsorption to the remaining soil or sediment In this work, a flow-through reactor was constructed and tested for application in a sequential extraction scheme. The sequential extraction scheme used was one developed for actinide-contaminated materials. The flow-through approach gave partitioning results that were similar to the batch method for uranium. We also monitored the extraction of stable Ca, K, Fe, Al, Zr, and Sc and obtained partitioning results generally similar to those observed with the batch extraction, except for Ca. Our results indicate readsorption of Ca when using a batch approach is small but significant and is eliminated with our new flow-through method. A limitation of the flow-through method is the possibility of underextraction of certain phases and higher analytical uncertainties. These uncertainties are more difficult to minimize, as compared to the uncertainty obtained with a batch approach. 相似文献
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