Laboratory of Chemistry, Department of Food Science & Human Nutrition, Agricultural University of Athens, Iera Odos 75, 11855 Athens, Greece.
Laboratory of Food Process Engineering, Department of Food Science & Human Nutrition, Agricultural University of Athens, Iera Odos 75, 11855 Athens, Greece.
Molecules. 2020 Apr 1;25(7):1614. doi: 10.3390/molecules25071614.
The aim of this work was to characterize the pistachio oil of the Greek variety, "Aegina", evaluate its various quality indices, and investigate the potential use of FTIR as a tool to discriminate different oil qualities. For this purpose, the antioxidant capacity, the tocopherol content and the oxidation and degradation of fatty acids, as described by k, Δk, R-values, and free acidity were evaluated using 45 samples from eight different areas of production and two subsequent years of harvesting. The antioxidant capacity was estimated using 2,2'-azinobis(3-ethylbenzothiazoline-6-sulfonic acid diammonium salt (ABTS) and 2,2-diphenyl-1-(2,4,6-trinitrophenyl)hydrazine (DPPH) assays, and the tocopherol content was quantified through HPLC analysis. FTIR spectra were recorded for all samples and multivariate analysis was applied. The results showed significant differences between the oil samples of different harvesting years, which were successfully discriminated by a representative FTIR spectral region based on R-value, total antioxidant capacity, and scavenging capacity, through ABTS. A similar approach could not be confirmed for the other quality parameters, such as the free acidity and the tocopherol content. This research highlighted the possibility of developing a simple, rapid, economic, and environment friendly method for the discrimination of pistachio oils according to their quality profile, through FTIR spectroscopy and multivariate analysis.
本工作旨在对希腊品种“埃伊娜”开心果油进行特征描述，评估其各种质量指标，并研究傅里叶变换红外光谱（FTIR）作为一种区分不同油质的工具的潜力。为此，使用来自八个不同生产地区的 45 个样本和随后两年的收获物，评估了抗氧化能力、生育酚含量以及脂肪酸的氧化和降解，如 k、Δk、R 值和游离酸度所描述的那样。抗氧化能力使用 2,2'-联氨二（3-乙基苯并噻唑啉-6-磺酸）二铵盐（ABTS）和 2,2-二苯基-1-（2,4,6-三硝基苯基）肼（DPPH）测定法进行估计，生育酚含量通过 HPLC 分析进行定量。记录了所有样品的 FTIR 光谱，并进行了多元分析。结果表明，不同收获年份的油样之间存在显著差异，通过基于 R 值、总抗氧化能力和 ABTS 清除能力的代表性 FTIR 光谱区域，可以成功区分。然而，对于其他质量参数，如游离酸度和生育酚含量，无法确认类似的方法。这项研究强调了通过傅里叶变换红外光谱和多元分析，根据其质量特征，开发一种简单、快速、经济和环保的方法来区分开心果油的可能性。
