共查询到20条相似文献,搜索用时 203 毫秒
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辣椒碱的提取和应用现状 总被引:1,自引:0,他引:1
综述了辣椒碱的性质、提取方法及用途。列举了溶剂萃取法、微波法和超临界CO2流体萃取等典型的提取精制方法,并简要介绍了辣椒碱的应用前景。 相似文献
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综述了辣椒碱的性质、提取方法及用途。列举了溶剂萃取法、微波法和超临界CO2流体萃取等典型的提取精制方法,并简要介绍了辣椒碱的应用前景。 相似文献
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大豆胚芽油三种提取方法的比较研究 总被引:3,自引:0,他引:3
采用索氏提取法、超声波强化提取法和超临界CO2萃取法分别提取大豆胚芽油。在对提取工艺优化的基础上,将3种方法的萃取效率及所得胚芽油的理化性质、磷脂、不皂化物含量和脂肪酸组成进行分析比较,探讨萃取方法与油品的关系,全面评价萃取方法的优劣。研究结果表明:索氏提取法的出油率最高,但提取时间长;超声波强化法的出油率次之,提取时间最短,但溶剂用量大;超临界CO2萃取法出油率较低,但时间较短,流程简单无溶剂残留。超临界CO2萃取法所得胚芽油的磷脂含量低,不皂化物及不饱和脂肪酸含量高。综合考虑,超临界CO2萃取法是提取大豆胚芽油的最佳方法。 相似文献
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直接浸出改造为挤压膨化浸出 总被引:6,自引:5,他引:1
在预处理工序加入膨化机 ,对原 12 0 0t/d工艺和设备进行相应的调整 ,有效地提高产量5 3% ,降低毛油中非水化磷脂含量 ,毛油精炼率提高 0 5 % ,粕中尿素酶稳定 ,改善了豆粕质量 ,减少蒸汽用量 11% ,动力消耗下降 12 %。 相似文献
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以白牛肝菌为试验原料,利用三相萃取法优化白牛肝菌多糖的提取工艺,并对其抗氧化性进行研究。对(NH4)2SO4添加量、叔丁醇添加量、萃取温度、水提次数等因素进行单因素试验,在此基础上进行响应面优化设计,得到最佳工艺条件为:(NH4)2SO4添加量30%、叔丁醇添加量10 mL、萃取温度37℃、水提次数1次,多糖提取率达到47.3%。白牛肝菌多糖的抗氧化性研究结果发现,白牛肝菌多糖对·OH和DPPH·的半数清除率值分别达到2.5 mg/mL和11.6 mg/mL,说明具有较高的抗氧化性,三相萃取法工艺很好的保留白牛肝菌多糖的活性。 相似文献
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传统的萃取前处理技术及部分新技术都存在一些不足,索氏萃取不仅速度慢,污染严重,而且无法保证目标成分从待检样品中100%的溶出;ASE快速溶剂萃取回收率不仅容易受水分含量的影响,而且在过高温压下目标成分容易被破坏.但是随着各种技术的发展和应用,样品检测前处理技术也得到了不断的发展,如微波萃取技术. 相似文献
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Jun Watanabe Tomoyuki Oki Jun Takebayashi Yuko Takano‐Ishikawa 《Journal of food science》2014,79(9):C1665-C1671
The efficient extraction of antioxidants from food samples is necessary in order to accurately measure their antioxidant capacities. α‐Tocopherol and gallic acid were spiked into samples of 5 lyophilized and pulverized vegetables and fruits (onion, cabbage, Satsuma mandarin orange, pumpkin, and spinach). The lipophilic and hydrophilic antioxidants in the samples were sequentially extracted with a mixed solvent of n‐hexane and dichloromethane, and then with acetic acid–acidified aqueous methanol. Duplicate samples were extracted: one set was extracted using an automated pressurized liquid extraction apparatus, and the other set was extracted manually. Spiked α‐tocopherol and gallic acid were recovered almost quantitatively in the extracted lipophilic and hydrophilic fractions, respectively, especially when pressurized liquid extraction was used. The expected increase in lipophilic oxygen radical absorbance capacity (L‐ORAC) due to spiking with α‐tocopherol, and the expected increase in 2,2‐diphenyl‐1‐picrylhydrazyl radical scavenging activities and total polyphenol content due to spiking with gallic acid, were all recovered in high yield. Relatively low recoveries, as reflected in the hydrophilic ORAC (H‐ORAC) value, were obtained following spiking with gallic acid, suggesting an interaction between gallic acid and endogenous antioxidants. The H‐ORAC values of gallic acid–spiked samples were almost the same as those of postadded (spiked) samples. These results clearly indicate that lipophilic and hydrophilic antioxidants are effectively extracted from lyophilized food, especially when pressurized liquid extraction is used. 相似文献
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水酶法提油工艺初步研究 总被引:17,自引:0,他引:17
该文介绍水酶法提取植物油多种工艺方法及有关工艺影响因素,总结水酶法提油特点,对水酶法应用发展进行介绍,并就水酶法提油机理进行讨论,且对水酶法常出现乳状液问题,讨论破乳几种可能途径。 相似文献
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本文研究了微波辅助萃取茶多酚的机理,利用植物切片技术并通过电子光学显微镜,比较在常温、热水萃取和微波萃取后茶叶叶肉组织的破碎程度的差异及组织细胞内部结构的微观变化,结果初步表明微波作用下的浸提过程,不仅存在热效应,还存在非热效应,即微波电磁场的极化作用,这能极大提高浸提速率.相对于同温热水浸提,35℃和90℃微波辅助浸... 相似文献