共查询到19条相似文献,搜索用时 46 毫秒
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超临界流体萃取茶叶香气成分的研究 总被引:4,自引:0,他引:4
采用超临界流体萃取技术提取茶叶中的香气成分,研究温度、压力、时间、CO2流量对超临界流体萃取得率的影响,通用正交实验法进行最佳工艺优化并对产物进行GC/MS定性分析.结果表明:萃取时间4 h、萃取温度50 ℃、CO2流量8 L/h、萃取压力30 MPa时得率为2.82%,共鉴定出28种香味成分. 相似文献
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文章综述了超临界二氧化碳流体萃取技术的特点,并从饮品和酒类、油脂、多不饱和脂肪酸、天然色素和天然香料五个方面对其应用进行了介绍。同时对超临界CO2流体萃取技术前景进行了展望。 相似文献
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超临界流体萃取鸦胆子油工艺研究 总被引:4,自引:0,他引:4
通过实验研究超临界流体萃取鸦胆子油,测定萃取温度、压力对鸦胆子油得率的影响,并与用其它萃取剂萃取操作进行比较,同时分析产物中游离脂肪酸含量的变化规律。 相似文献
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杨靖 《食品与生物技术学报》2008,27(3)
研究了温度、压力、时间、CO2体积流量对超临界流体萃取葡萄籽油得率的影响,并进行了最佳工艺优化.结果表明,影响CO2流体萃取葡萄皮精油效率因素的主次作用为萃取时间>萃取压力>萃取温度>CO2体积流量,最佳工艺条件为萃取时间4 h、萃取温度45 ℃、CO2体积流量8 L/h、萃取压力30 MPa.葡萄籽油出油率为14.8%. 相似文献
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Essential oils were extracted from four different varieties of lemon-scented plants utilizing supercritical fluid extraction. The plants used included: lemon eucalyptus (Eucalyptus citriodora), lemon balm (Melissa officinalis), lemon bergamot (Monarda citriodora), and lemongrass (Cymbopogon citratus). Extracts from three plants of each species were analysed using gas chromatography and confirmed with GC-MS. The compounds identified for each plant species were: lemon balm (citronellal, neral, geranial, neral acetate, caryophyllene, and caryophyllene oxide), lemon bergamont (thymol, thymol methylester, and α -terpine), lemon eucalyptus (citronellal, neral, caryophyllene, and caryophyllene oxide), and lemongrass (neral, geranial, and caryophyllene). Supercritical fluid extractions were performed at three pressures (13,790, 27,580, and 41,370 kPa) and two extraction temperatures (40 and 60 °C). The results indicated that the mass percent extracted increased with increasing temperature and pressure, as was the ratio of the compounds in the different samples. The effect of particle size reduction on the extraction yield was also investigated. The extraction yield did not increase due to the increase in surface area as would be expected, but decreased. This has been attributed to the fact that the compounds of interest are extremely volatile and were lost to the atmosphere during the grinding process. 相似文献
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超临界流体萃取技术研究进展 总被引:16,自引:1,他引:16
超临界流体萃取 (SFE)是使用超临界流体作为溶剂的一种现代分离技术。与传统的方法相比 ,SFE具有处理温度低 ,萃取挥发性成分效果好 ,不发生氧化变质的优点。它能够用于香精香料、色素、油脂的萃取 ,在脱咖啡因和食品分析方面也有应用。本文回顾了SFE的研究历程 ,描述了该技术的概况、原理以及在食品工业中的应用。简单介绍了生产设备 ,并详细讨论了溶剂CO2 的特殊价值以及辅助溶剂的重要作用。最后 ,文章分析了该技术商业应用的主要问题 ,并对它的前景作了展望 相似文献
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为了研究烟草花在烟草、香料、医药等方面的应用,以响应面法对烟草花超临界CO2萃取工艺进行了优化。以烟草花萃取率为响应值,根据Box-Behnken Design(BBD)设计实验,确定各工艺条件对萃取率的影响;采用气相色谱-质谱法对萃取物挥发性成分进行分析鉴定。结果表明:①烟草花的最佳超临界CO2萃取条件为:萃取压力31.9 MPa,萃取温度47.3℃,萃取时间108.5 min。②烟草花超临界CO2提取物中共鉴定出28种化合物,其中,含量最高的是1,5,9-三甲基-12-(1-异丙基)-4,8,13-环十四碳三烯-1,3-二醇(43.81%)。 相似文献
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ABSTRACT: Low-caffeine or caffeine-removed tea and its products are widely welcomed on market in recent years. In the present study, we adopt ultrasonic-enhanced supercritical fluid extraction process to remove caffeine from green tea. An orthogonal experiment (L16 (45)) was applied to optimize the best removal conditions. Extraction pressure, extraction time, power of ultrasound, moisture content, and temperature were the main factors to influence the removal rate of caffeine from green tea. The 5 factors chosen for the present investigation were based on the results of a single-factor test. The optimum removal conditions were determined as follows: extraction pressure of 30 MPa, temperature at 55 °C, time of 4 h, 30% moisture content, and ultrasound power of 100 W. Chromatogram and ultraviolet analysis of raw material and decaffeinates suggests that under optimized conditions, the caffeine of green tea was effectively removed and minished without damaging the structure of active ingredients in green tea. 相似文献
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采用茶叶感官审评及气相色谱-质谱等技术手段对香气成分进行检测,并结合多种统计分析方法,系统研究单丛茶香气化学品质的物质基础。结果表明:单丛茶最主要挥发性物质为吲哚、脱氢芳樟醇、芳樟醇、茉莉内酯、臧红花醛和β-环柠檬醛,其他重要挥发性物质为橙花叔醇、苯乙腈和α,4-二甲基-3-环己烯-1-乙醛等。在单丛茶挥发性组分中,以花果香为主的醇类化合物含量最多,含氮化合物含量次之。在相关分析与聚类分析中,银花香和桂花香表现较为独特。蜜香型和花香型单丛茶在主成分分析和正交偏最小二乘法判别分析结果中有较好分属区域,所建正交偏最小二乘法判别分析模型适用性和检验效果良好。该研究结果可为单丛茶的香气品质评价和提高产品质量提供科学依据。 相似文献