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Ethanol and supercritical fluid extraction of Echinacea angustifolia roots.

机译:乙醇和超临界流体萃取紫锥菊的根。

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摘要

Echinacoside and cynarine in dried Echinacea angustifolia roots were extracted using pure ethanol (100%) at 25, 50 and 75°C for 30, 60 and 90 min with solvent to feed ratios of 20:1 and 10:1. Echinacoside and cynarine yields were significantly affected (p ≤ 0.05) by all three variables and increased with increasing temperature and time. Higher solvent to feed ratio generally resulted in higher yields. The highest echinacoside and cynarine yields obtained were 0.82% and 1.10%, respectively.; Alkylamides in fresh and dried E. angustifolia roots were extracted using supercritical carbon dioxide at 45, 60°C and 34, 55 MPa. Alkylamide yield of fresh roots increased with increasing temperature but decreased with increasing pressure while those from ground air-dried roots increased with higher temperature and pressure. The latter yielded the highest alkylamides as compared with those from fresh or unground dried roots. The use of freeze-dried roots did not give better extraction results as compared to air-dried roots for echinacoside, cynarine and alkylamides.
机译:使用纯乙醇(100%)在25、50和75°C下以30:60和90min的纯乙醇(100%)萃取紫锥花和芥子碱,溶剂与进料的比例为20:1和10:1。紫丁香苷和鸟氨酸的产量均受所有三个变量的显着影响(p≤0.05),并随温度和时间的增加而增加。较高的溶剂进料比通常导致较高的产率。获得的最高的洋地黄苷和鸟氨酸产量分别为0.82%和1.10%。使用超临界二氧化碳在45、60°C和34、55 MPa压力下提取新鲜和干燥的桔梗根中的烷基酰胺。新鲜根的烷基酰胺产量随温度增加而增加,但随压力增加而降低,而来自风干的根的烷基酰胺产量随温度和压力的增加而增加。与来自新鲜或未研磨的干燥根的那些相比,后者产生最高的烷基酰胺。与风干根中的紫锥花苷,苏氨酸和烷基酰胺相比,冻干根的提取效果不佳。

著录项

  • 作者

    Sun, Li.;

  • 作者单位

    University of Alberta (Canada).;

  • 授予单位 University of Alberta (Canada).;
  • 学科 Agriculture Food Science and Technology.
  • 学位 M.Sc.
  • 年度 2001
  • 页码 111 p.
  • 总页数 111
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 农产品收获、加工及贮藏;
  • 关键词

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