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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 >SUPERCRITICAL FLUID EXTRACTION OF THE SEED OF COIX LACHRYMA-JOBI L
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SUPERCRITICAL FLUID EXTRACTION OF THE SEED OF COIX LACHRYMA-JOBI L

机译：Coach Lachryma-Jobi L种子的超临界流体萃取

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摘要

In this work, the oil and fat in a mixture of the hull and the testa of the seed of Coix Lachryma-Jobi L. is extracted by supercritical carbon dioxide. The investigated temperature and pressure ranges from 35 to 50℃ and from 20.7 to 48.3 MPa, It is found that the weight fraction of extractable oil and fat in the mixture depends on the pressure and temperature and can be correlated to CO_2 density. The calculated solubility parameter of the oil and fat, 17.03 J~(1/2)/cm~(3/2), implies that supercritical carbon dioxide has the maximum solvent power when it's density reaches 0.973, which is also used to explain the abnormal behavior of the extraction curves. Some oil and fat samples are also measured for its antioxidation activity by observing the reduction of the UV absorption intensity of DPPH. It is found that little of oxidation activity can be obtained if the oil and fat is collected after 2 wt% of the mixture has been recovered. It is recommended to operate the extraction at medium pressure for the purpose of antioxidation activity. However, the calculated solubility parameter for the potential active compounds shows that the extraction should conduct at high pressure such that active compounds can be extracted and entrained with the oil and fat.
机译：在这项工作中，Coix Lachryma-Jobi L.种子的壳和种皮的混合物中的油脂被超临界二氧化碳提取。研究的温度和压力范围为35至50℃，范围为20.7至48.3 MPa，发现混合物中可萃取油脂的重量分数取决于压力和温度，并且可以与CO_2密度相关。计算得出的油脂溶解度参数为17.03 J〜（1/2）/ cm〜（3/2），表明超临界二氧化碳在其密度达到0.973时具有最大的溶剂功率，这也可以用来解释提取曲线的异常行为。还通过观察DPPH紫外线吸收强度的降低来测量一些油脂样品的抗氧化活性。已经发现，如果在2wt％的混合物已被回收之后收集油脂，则几乎不能获得氧化活性。为了抗氧化活性，建议在中压下进行萃取。但是，计算出的潜在活性化合物的溶解度参数表明，萃取应在高压下进行，以便可以萃取活性化合物并夹带油脂。

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