ABSTRACT

This study aims to identify the individual phenolics and volatile compounds, as well as the organic acids of strawberry tree (Arbutus unedo L.) genotype fruits. The antioxidant activities were also assessed using three methods (DPPH, ABTS and βeta carotene bleaching assays) significant differences (p˂0.05) were observed among all the genotypes. Total phenols varied from 25.37 to 39.06 mg GAE/g dried weight (DW), total flavonoids ranged between 3.30 and 7.07 mg RE/g DW, and anthocyanins varied from 0.15 to 0.64 mg cya-3-glu/100 g DW. Moreover, the antioxidant activities were in the range of 3.33–21.08, 2.25–19.58, and 1.08–13 mg ascorbic acid equivalent/g DW for DPPH, ABTS and βeta carotene bleaching assays, respectively. Seventeen phenolics compounds were identified by HPLC in A. unedo fruits. Gallocatechol and catechin were the most abundant compounds. Among the volatile compounds identified, hexadecanoic acid was the most abundant in all the genotype fruits. The principal component analysis revealed that the first two components formed 66.47% of the total inertia.

摘要

本研究旨在鉴定草莓树 ( Arbutus unedo L.) 基因型果实的单个酚类物质和挥发性化合物以及有机酸。还使用三种方法（DPPH、ABTS 和β-胡萝卜素漂白测定）评估了抗氧化活性，在所有基因型之间观察到显着差异（p˂0.05）。总酚在 25.37 到 39.06 mg GAE/g 干重 (DW) 之间变化，总黄酮在 3.30 到 7.07 mg RE/g DW 之间变化，花青素在 0.15 到 0.64 mg cya-3-glu/100 g DW 之间变化。此外，DPPH、ABTS 和β-胡萝卜素漂白试验的抗氧化活性分别在 3.33-21.08、2.25-19.58 和 1.08-13 mg 抗坏血酸当量/g DW 范围内。通过 HPLC 在A. unedo中鉴定出 17 种酚类化合物水果。没食子儿茶酚和儿茶素是最丰富的化合物。在鉴定的挥发性化合物中，十六烷酸在所有基因型水果中含量最多。主成分分析表明，前两个成分占总惯量的 66.47%。