Uppsala University, Department of Physical and Analytical Chemistry, P.O. Box 599, SE-751 24, Uppsala, Sweden.
Anal Chim Acta. 2010 Mar 17;663(1):27-32. doi: 10.1016/j.aca.2010.01.023. Epub 2010 Feb 1.
Pressurized Hot Water Extraction (PHWE) is a quick, efficient and environmentally friendly technique for extractions. However, when using PHWE to extract thermally unstable analytes, extraction and degradation effects occur at the same time, and thereby compete. At first, the extraction effect dominates, but degradation effects soon take over. In this paper, extraction and degradation rates of anthocyanins from red onion were studied with experiments in a static batch reactor at 110 degrees C. A total extraction curve was calculated with data from the actual extraction and degradation curves, showing that more anthocyanins, 21-36% depending on the species, could be extracted if no degradation occurred, but then longer extraction times would be required than those needed to reach the peak level in the apparent extraction curves. The results give information about the different kinetic processes competing during an extraction procedure.
加压热水萃取（PHWE）是一种快速、高效且环保的萃取技术。然而，当使用 PHWE 萃取热不稳定分析物时，萃取和降解同时发生，并相互竞争。起初，萃取效果占主导地位，但降解效果很快就会占据主导地位。在这项研究中，在 110°C 的静态分批反应器中进行实验，研究了从红洋葱中提取花色苷的萃取和降解速率。通过实际的萃取和降解曲线的数据计算出总萃取曲线，结果表明，如果没有降解发生，可以提取更多的花色苷，具体数量取决于物种，约为 21-36%，但需要更长的萃取时间才能达到表观萃取曲线中的峰值水平。该结果提供了有关萃取过程中竞争的不同动力学过程的信息。
