Department of Chemical Engineering and Food Technology, Faculty of Science, University of Cadiz, Campus de Excelencia International Agroalimentario ceiA3, Box 40, 11510 Puerto Real, Cadiz, Spain.
Molecules. 2013 Mar 8;18(3):3137-51. doi: 10.3390/molecules18033137.
In the work described here, two techniques for the recovery of anthocyanins from potato peel were studied and compared. One of the techniques employed was supercritical fluid extraction (SFE) with pure CO2 or with CO2 and ethanol as cosolvent and the other technique was pressurized liquid extraction (PLE), where the solvent used was ethanol in water acidified to pH 2.6. The effects of pressure and temperature were studied and the anthocyanin contents obtained were statistically analyzed. In SFE the use of low pressure (100 bar) and high temperature (65 °C) was desirable for the anthocyanin extraction. With PLE the anthocyanin contents are increased considerably, and the best yields were obtained at 100 bar and 80 °C. This result is in correspondence with antioxidant activity index values (1.66) obtained in a DPPH antioxidant activity assay. In the extracts obtained with PLE the phenolic compounds were also determined, but the main compounds presented in the extract are anthocyanins.
在这里描述的工作中，研究并比较了两种从土豆皮中回收花色苷的技术。一种技术是使用纯二氧化碳或二氧化碳和乙醇作为共溶剂的超临界流体萃取（SFE），另一种技术是加压液体萃取（PLE），其中使用的溶剂是酸化至 pH 2.6 的水乙醇。研究了压力和温度的影响，并对获得的花色苷含量进行了统计分析。在 SFE 中，较低的压力（100 巴）和较高的温度（65°C）有利于花色苷的提取。在 PLE 中，花色苷含量显著增加，在 100 巴和 80°C 时获得了最佳产率。这一结果与在 DPPH 抗氧化活性测定中获得的抗氧化活性指数值（1.66）相对应。在 PLE 获得的提取物中还测定了酚类化合物，但提取物中主要的化合物是花色苷。
