Besides some agronomic characteristics, the variability of lycopene and total phenolic contents of six watermelon varieties (four commercial cultivars 'Aramis', 'Crimson Sweet', 'Dumara', 'Giza', and two new selections P503 and P403 developed by the National Agricultural Research Institute of Tunisia) as influenced by sampling area was determined. Interest in assessing agronomic and bioactive compounds with antioxidant capacity and potential health benefits in watermelon is increasing. Watermelon (Citrullus lanatus (Thunb.) Mansfeld) is a popular vegetable. They also give valuable insights into the synthesis and accumulation of bioactive compounds in such fruits, and furthermore move us closer to identifying the harvesting period with the highest antioxidant potential. These data confirm the important role played by genetic background and ripening stage in determining antioxidant potential of watermelon fruits. Although, the HAA of the studied watermelon cultivars was significantly influenced by the ripening stages, it only correlated to the amount of total phenols and flavonoids. Giza cultivar scored first for total phenol (260.1mgGAEkg−1 fw), flavonoid (260.0mgREkg−1 fw) and total vitamin C (204.0mgkg−1 fw) contents. At the red-ripe stage of ripeness, P503 cultivar showed the highest amount of lycopene (64.5mgkg−1 fw), whereas Dumara cultivar showed the highest level of β-carotene (2.1mgkg−1 fw).
Good correlations between LAA and lycopene and β-carotene contents were found using the TEAC assay. Ripening stage significantly influenced lycopene and β-carotene contents, as well as the LAA of all investigated watermelon cultivars. Lipophilic and hydrophilic antioxidant activities (LAA and HAA, respectively) were determined, and their correlations with total vitamin C, phenol, flavonoid, lycopene and β-carotene contents were studied. This study indicates that the total phenolics and flavonoid contents of watermelon can vary considerably with changes in environmental conditions.Ĭhanges in bioactive compounds and antioxidant activities of three commercial selections (Crimson sweet, Dumara and Giza) and two new selections (P503 and P403) of watermelon cultivars were investigated at four different fruit ripening stages (white, white-pink, pink and red-ripe).
ORANGE FLESH WATER MELON FULL
The mean total phenolics and flavonoid contents of the five cultivars was 62 and 66% higher, respectively, in full season than in early season. The flavonoid content ranged from 150.60 to 226.44 mg RE/kg FW in early (January -May) and full (March -July) seasons, respectively.
The total phenolics in the watermelon cultivars ranged from 122.81 to 200.69 mg GAE kg í1 FW in early and full seasons, respectively.
The growing period significantly influenced yield, soluble solids, total phenolics and flavonoid contents of all investigated watermelon cultivars. Five watermelon cultivars (four commercial cultivars namely 'Crimson Sweet', 'Dumara', 'Giza', 'Aramis', and a new selection 'P503' produced by the National Agricultural Research Institute of Tunisia) were compared. Fruits from plants grown under low plastic tunnel and open-field conditions were collected. Besides some agronomic characteristics, total phenolics and flavonoid contents of different watermelon cultivars (Citrullus lanatus (Thunb.) Mansfeld), as influenced by two growing periods, were investigated.
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