Tassoult Malika, Kati Djamel Edine, Fernández-Prior María África, Bermúdez-Oria Alejandra, Fernandez-Bolanos Juan, Rodríguez-Gutiérrez Guillermo
Laboratoire de Biochimie Appliquée, Département des Sciences Alimentaires, Faculté des Sciences de la Nature et de la Vie, Université de Bejaia, Bejaia 06000, Algeria.
Instituto de la Grasa, Consejo Superior de Investigaciones Científicas (CSIC), Campus Universitario Pablo de Olavide, Edificio 46, Ctra. de Utrera, km 1, 41013 Seville, Spain.
Foods. 2021 Feb 26;10(3):503. doi: 10.3390/foods10030503.
The study investigated the phenols, sugar and the antioxidant capacities of date fruit extracts obtained by organic solvents and by hydrothermal treatment from six different Algerian cultivars at two ripening stages for the first time. The analyzed cultivars exhibited potent antioxidant properties (ferric reducing antioxidant power (FRAP), 1,1-Diphenyl-2-picrylhydrazyl (DPPH) and 2,2'-azino-bis(3-ethylbenzothiazoline-6-sulfonic acid (ABTS) scavenging capacities) and different phenols regardless of the solvents and the maturity stages. About 18 phenols were identified and quantified, mainly in the hydrothermal extracts. The earlier stages were characterized by high amounts of o-coumaric acid, cinnamic acid and luteolin, with a noticeable absence of quercetin. The tamr stage presented the highest sugar content (78.15-86.85 mg/100 mg dry weight (DW)) with an abundance of glucose. Galactose was present only in some cultivars from the kimri stage (tamjouhert). Uronic acids were mostly detected at the tamr stage (4.02-8.82 mg gallic acid equivalent/100 mg dried weight). The obtained results highlight the potential of using date fruit extracts as natural antioxidants, especially at industrial scales that tend use hydrothermal extraction.
该研究首次调查了通过有机溶剂和水热处理从六个不同阿尔及利亚品种的枣果在两个成熟阶段获得的提取物中的酚类、糖类和抗氧化能力。无论溶剂和成熟阶段如何，所分析的品种均表现出强大的抗氧化特性（铁还原抗氧化能力（FRAP）、1,1-二苯基-2-苦基肼（DPPH）和2,2'-联氮-双-（3-乙基苯并噻唑啉-6-磺酸）（ABTS）清除能力）以及不同的酚类。鉴定并定量了约18种酚类，主要存在于水热提取物中。早期阶段的特征是邻香豆酸、肉桂酸和木犀草素含量高，而槲皮素明显缺失。成熟后期阶段的糖含量最高（78.15 - 86.85毫克/100毫克干重（DW）），葡萄糖含量丰富。半乳糖仅存在于成熟初期阶段（tamjouhert）的一些品种中。糖醛酸大多在成熟后期阶段检测到（4.02 - 8.82毫克没食子酸当量/100毫克干重）。所得结果突出了将枣果提取物用作天然抗氧化剂的潜力，尤其是在倾向于使用水热提取的工业规模上。
