野生橄榄叶中的酚类提取物及其作为食用油抗氧化剂的潜力。

Phenolic Extracts from Wild Olive Leaves and Their Potential as Edible Oils Antioxidants.

作者信息

Lafka Theodora-Ioanna, Lazou Andriana E, Sinanoglou Vassilia J, Lazos Evangelos S

机构信息

Laboratory of Food Processing, Department of Food Technology, Technological Educational Institute of Athens, Agiou Spyridonos St., 12210, Egaleo, Athens, Greece.

Laboratory of Process Analysis and Design, School of Chemical Engineering, National Technical University of Athens, Zografou Campus, 15780, Athens, Greece.

出版信息

Foods. 2013 Jan 4;2(1):18-31. doi: 10.3390/foods2010018.

DOI:10.3390/foods2010018

PMID:28239093

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC5302236/

Abstract

The kinetics solid-liquid extraction of phenolics from wild olive leaves was elaborated using different mathematical models (Peleg, second order, Elovich, and power law model). As solvents, methanol, ethanol, ethanol:water 1:1, -propanol, isopropanol and ethyl acetate were used. The second order model best described the solvent extraction process, followed by the Elovich model. The most effective solvent was ethanol with optimum phenol extraction conditions 180 min, solvent to sample ratio 5:1 v/w and pH 2. Ethanol extract exhibited the highest antiradical activity among solvent and supercritical fluid extraction (SFE) extracts, which in addition showed the highest antioxidant capacity compared to synthetic and natural food antioxidants such as BHT, ascorbyl palmitate and vitamin E. Antioxidant potential of SFE extract was quite high, although its phenolic potential was not. Leaf extracts were proven to be good protectors for olive and sunflower oils at levels of 150 ppm.

摘要

采用不同的数学模型（佩雷格模型、二级模型、埃洛维奇模型和幂律模型）阐述了从野生橄榄叶中提取酚类物质的固液动力学。使用的溶剂有甲醇、乙醇、乙醇与水体积比为1:1的混合液、正丙醇、异丙醇和乙酸乙酯。二级模型对溶剂萃取过程的描述最佳，其次是埃洛维奇模型。最有效的溶剂是乙醇，最佳酚类提取条件为180分钟、溶剂与样品的比例为5:1（体积/重量）且pH值为2。乙醇提取物在溶剂提取物和超临界流体萃取（SFE）提取物中表现出最高的抗自由基活性，与合成和天然食品抗氧化剂如丁基羟基甲苯（BHT）、棕榈酸抗坏血酸酯和维生素E相比，其抗氧化能力也最高。SFE提取物的抗氧化潜力相当高，尽管其酚类潜力不高。叶提取物在150 ppm的水平下被证明是橄榄油和向日葵油的良好保护剂。