Laboratoire d'Aridoculture et de Cultures Oasiennes, Institut des Régions Arides, Km 22.5 route du Jorf, 4119 Médenine, Tunisia.
J Food Sci. 2011 Aug;76(6):C795-800. doi: 10.1111/j.1750-3841.2011.02211.x. Epub 2011 May 27.
Phenolics, flavonoids, anthocyanins, and tannins of pomegranate juices, obtained from 9 Tunisian ecotypes were quantified. Phenolics and flavonoids in the variety Tounsi (TN) (3299 mg gallic acid equivalents [GAE]/L and 636 mg quercetin equivalents [QE]/L of juice, respectively) were higher than in the variety Gabsi (GB) (1570 mg GAE/L and 135 mg QE/L of juice, respectively). The highest anthocyanins quantity was found in GB 2 with 156 mg cyanidin-3-glucoside equivalents (CGE)/L. TN 3 ecotype showed the highest tannins quantity with 2550 mg catechin equivalents (CE)/L of juice. TN 1 presented the highest radical-scavenging activity (2, 2'-azinobis-3-ethylbenzothiazoline-6-sulphonate [ABTS], IC₅₀ [50% inhibition concentration] = 525 mg/L), as well as the highest concentration of micronutrient cations (potassium and sodium). A high correlation (R² = 0.80) between antioxidant capacity and proanthocyanin contents was found, this suggests that proanthocyanins are the principal contributor in the antioxidant capacity of pomegranate. Our data suggest also that the high concentrations of K⁺ and Na⁺ may play a role in the adaptation of pomegranate to arid environments.
测定了来自 9 个突尼斯生态型的石榴汁中的酚类、类黄酮、花青素和单宁。品种 Tounsi（TN）（果汁中分别含有 3299 毫克没食子酸当量 [GAE] 和 636 毫克槲皮素当量 [QE]）中的酚类和类黄酮含量高于品种 Gabsi（GB）（果汁中分别含有 1570 毫克 GAE 和 135 毫克 QE）。GB2 中发现的花青素含量最高，为 156 毫克矢车菊素-3-葡萄糖苷当量（CGE）/L。TN3 生态型的单宁含量最高，为 2550 毫克儿茶素当量（CE）/L 的果汁。TN1 表现出最高的自由基清除活性（2，2'-偶氮双-3-乙基苯并噻唑啉-6-磺酸 [ABTS]，IC₅₀[50%抑制浓度] = 525 mg/L），以及最高浓度的微量元素阳离子（钾和钠）。发现抗氧化能力与原花青素含量之间存在高度相关性（R² = 0.80），这表明原花青素是石榴抗氧化能力的主要贡献者。我们的数据还表明，高浓度的 K⁺和 Na⁺可能在石榴适应干旱环境中发挥作用。
