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首页> 外文会议>International Symposium on Supercritical Fluids Tome 1: Natural Products, Process amp; Equipment Development; 20030428-20030430; Versailles; FR >SELECTIVE EXTRACTION OF PHOSPHOLIPIDS FROM EGG YOLK WITH SUPERCRITICAL CO_2
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SELECTIVE EXTRACTION OF PHOSPHOLIPIDS FROM EGG YOLK WITH SUPERCRITICAL CO_2

机译：超临界CO_2从蛋黄中选择性提取磷脂

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摘要

It is well known that supercritical CO_2 (SC-CO_2) is very efficient to remove neutral lipids from a variety of matrices, such as plant seeds, The valuable, polar phospholipids (PL) remain behind, which is ascribed to their limited solubility in SC-CO_2. Typically, they are extracted by adding a polar modifier such as methanol or ethanol to the supercritical fluid (SC-fluid). In a recent study, PL could be extracted from egg yolk powder without using a modifier. This was accomplished by 4 subsequent extractions at 517 bar and 40℃. The procedure is advantageous, because it is technically simpler and because no conventional solvents are needed. In this study, the extraction of PL from egg yolk is explored in more detail. The extraction is performed with SC-CO_2, and the efficiency is examined as a function of time and process parameters such as temperature, pressure and pulsation, Furthermore, the effect of the polarity of the SC-fluid is investigated by adding ethanol as modifier. Within the processing conditions studied, the PL cannot be extracted from egg yolk powder without adding at least 5 mole% ethanol as modifier. The extraction efficiency of the PL increases with the ethanol concentration and with the pressure. The processing temperature shows only a minor effect at a low ethanol concentration.
机译：众所周知，超临界CO_2（SC-CO_2）可以非常有效地从多种基质（例如植物种子）中去除中性脂质。有价值的极性磷脂（PL）仍然存在，这归因于它们在SC中的有限溶解性-CO_2。通常，通过向超临界流体（SC-流体）中添加极性改性剂（例如甲醇或乙醇）来提取它们。在最近的研究中，无需使用改性剂就可以从蛋黄粉中提取PL。这是通过在517 bar和40℃下进行4次后续萃取来完成的。该方法是有利的，因为它在技术上更简单并且因为不需要常规溶剂。在这项研究中，更详细地研究了从蛋黄中提取PL。用SC-CO_2进行萃取，并根据时间和过程参数（例如温度，压力和脉动）来检查效率，并通过添加乙醇作为改性剂来研究SC流体极性的影响。在研究的加工条件下，如果不添加至少5摩尔％的乙醇作为改性剂，则无法从蛋黄粉中提取PL。 PL的提取效率随乙醇浓度和压力的增加而增加。在低乙醇浓度下，加工温度仅显示较小的影响。

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