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.

中文翻译：

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黄连木油的 FTIR-化学计量学区分的质量参数和抗氧化能力研究

这项工作的目的是表征希腊品种“Aegina”的开心果油，评估其各种质量指标，并研究 FTIR 作为区分不同油质量的工具的潜在用途。为此，使用来自八个不同生产区域和随后两年的 45 个样品评估了抗氧化能力、生育酚含量以及脂肪酸的氧化和降解，如 k、Δk、R 值和游离酸度所述。收获。使用 2,2'-azinobis(3-ethylbenzothiazoline-6-sulfonic acid didium salt, ABTS) 和 2,2-diphenyl-1-(2,4,6-trinitrophenyl)hydrazine (DPPH) 测定法评估抗氧化能力，生育酚含量通过 HPLC 分析定量，记录所有样品的 FTIR 光谱并应用多变量分析。结果表明，不同收获年份的油样之间存在显着差异，通过基于 R 值、总抗氧化能力和清除能力的代表性 FTIR 光谱区域，通过 ABTS 成功区分。对于其他质量参数，例如游离酸度和生育酚含量，无法确认类似的方法。这项研究强调了开发一种简单、快速、经济且环境友好的方法，通过 FTIR 光谱和多变量分析根据其质量特征来区分开心果油的可能性。通过 ABTS。对于其他质量参数，例如游离酸度和生育酚含量，无法确认类似的方法。这项研究强调了开发一种简单、快速、经济且环境友好的方法，通过 FTIR 光谱和多变量分析根据其质量特征来区分开心果油的可能性。通过 ABTS。对于其他质量参数，例如游离酸度和生育酚含量，无法确认类似的方法。这项研究强调了开发一种简单、快速、经济且环境友好的方法，通过 FTIR 光谱和多变量分析根据其质量特征来区分开心果油的可能性。