期刊
FOODS
卷 10, 期 3, 页码 -出版社
MDPI
DOI: 10.3390/foods10030503
关键词
Phoenix dactylifera L.; secondary dates; phenolic profile; antioxidant activities; sugars
资金
- Spanish Ministry of Economy and Competitiveness - European Social Fund (ESF) [AGL2016-79088R]
- Spanish Ministry of Economy and Competitiveness Ramon y Cajal Programme [RyC 2012-10456]
The study found that date fruit extracts obtained through organic solvents and hydrothermal treatment are rich in antioxidants and phenols, with different characteristics depending on the maturity stages and cultivars. The tamr stage has the highest sugar content, while phenols are mainly present in the hydrothermal extracts.
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.
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