Díaz-Reinoso Beatriz, Moure Andrés, Domínguez Herminia, Parajó Juan Carlos
Departamento de Enxeñería Química, Facultade de Ciencias de Ourense, Universidade de Vigo, As Lagoas, 32004 Ourense, Spain.
J Agric Food Chem. 2006 Apr 5;54(7):2441-69. doi: 10.1021/jf052858j.
Supercritical fluid extraction (SCFE), based on the utilization of a fluid under supercritical conditions, is a technology suitable for extraction and purification of a variety of compounds, particularly those that have low volatility and/or are susceptible to thermal degradation. The interest in SCFE is promoted by legal limitations of conventional solvents for food and pharmaceutical uses. The physicochemical properties of supercritical CO2 (higher diffusivity, lower viscosity, and lower surface tension than conventional solvents) facilitate mass transfer and allow an environmentally friendly operation. This article presents a comprehensive compilation of data on the supercritical CO2 extraction of antioxidant compounds from vegetal materials, with particular attention to those of a phenolic nature. Aspects concerning the supercritical operation for extraction and fractionation of antioxidants compounds are considered, including equilibrium solubility of pure compounds and effects of the operational conditions on the antioxidant activity of isolated fractions. The data are compared to those reported for synthetic antioxidants and natural extracts obtained by conventional solvent extraction from vegetal matrices.
超临界流体萃取（SCFE）基于超临界条件下流体的利用，是一种适用于多种化合物萃取和纯化的技术，尤其是那些挥发性低和/或易受热降解的化合物。对SCFE的关注是由食品和制药用途中传统溶剂的法律限制所推动的。超临界二氧化碳的物理化学性质（比传统溶剂具有更高的扩散率、更低的粘度和更低的表面张力）有利于传质，并允许进行环境友好型操作。本文全面汇编了从植物材料中超临界二氧化碳萃取抗氧化剂化合物的数据，特别关注酚类性质的抗氧化剂化合物。考虑了有关超临界操作萃取和分馏抗氧化剂化合物的各个方面，包括纯化合物的平衡溶解度以及操作条件对分离馏分抗氧化活性的影响。将这些数据与合成抗氧化剂以及通过从植物基质中常规溶剂萃取获得的天然提取物所报告的数据进行了比较。
