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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 ANTISOLVENT FRACTIONATION OF PROPOLIS TINCTURE
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SUPERCRITICAL ANTISOLVENT FRACTIONATION OF PROPOLIS TINCTURE

机译：蜂胶胶的超临界抗分馏

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摘要

Propolis is used by bees for holding a hive together, and for sterilizing the hive against microbial infections. Propolis contains a high concentration of flavonoids, which are used in a wide range of cosmetic and health food preparations for their antimicrobial properties. Propolis is usually dissolved in ethanol or ethanol/water mixtures to produce a tincture, and to remove insoluble material such as waxes and detritus from the hive. A new supercritical antisolvent/extraction process has been developed for the fractionation of propolis tincture to increase the concentration of flavonoids and remove high molecular mass components and the essential oil. Flavonoids are practically insoluble in pure CO_2, but sufficiently soluble in CO_2 + ethanol to enable their separation from high molecular mass and/or more polar components. In the first step of the process, supercritical CO_2 is used both as an anti-solvent to precipitate high molecular mass components (and water), and as a solvent to extract the ethanol and soluble components of the propolis. This extract is then fractionated in two separation steps to give a concentrated flavonoid fraction as the main product, and an essential oil/ethanol fraction as a secondary product. The effects of pressure, temperature, flow rate ratio, tincture composition and concentration on product quality and yield were determined at a laboratory and pilot scale. The tincture concentration of Propolis, and tincture composition has the greatest effect on the yield and concentration of flavonoids in the product fraction.
机译：蜂使用蜂胶将蜂巢固定在一起，并对蜂巢进行杀菌以抵抗微生物感染。蜂胶含有高浓度的类黄酮，由于其抗菌性能，它们被广泛用于化妆品和保健食品中。蜂胶通常溶解在乙醇或乙醇/水混合物中以产生a剂，并从蜂巢中去除不溶性物质，例如蜡和碎屑。已经开发了一种新的超临界抗溶剂/萃取工艺，用于蜂胶tin剂的分馏，以增加类黄酮的浓度并去除高分子量成分和精油。黄酮类化合物实际上不溶于纯CO_2，但足以溶于CO_2 +乙醇，以使其与高分子量和/或更多极性组分分离。在该过程的第一步中，超临界CO_2既用作沉淀高分子量成分（和水）的反溶剂，又用作提取蜂胶的乙醇和可溶性成分的溶剂。然后将该提取物在两个分离步骤中分馏，得到浓缩的类黄酮馏分作为主要产物，并将精油/乙醇馏分作为第二产物。在实验室和中试规模下确定压力，温度，流速比，tin剂组成和浓度对产品质量和产量的影响。蜂胶的tin剂浓度和tin剂组成对产物级分中黄酮类化合物的收率和浓度影响最大。

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