Seasonal variations in antioxidant components of cherry tomatoes (Lycopersicon esculentum cv. Naomi F1)

To evaluate seasonal variations in antioxidant components of greenhouse cherry tomatoes, the compositional profile of fruits (Pornodoro di Pachino, cv. Naomi F1) harvested at six different times of the year was compared. Among tomato antioxidants, phenolic compounds (naringenin content ranged from 1.84 to 9.04mg/100g, rutin from 1.79 to 6.61mg/100g) and alpha-tocopherol (40-1160 mu g/100g) showed the greatest variability. Ascorbic acid (31-71mg/100g), carotenoids (8350-15119 mu g/100g), phenolics and alpha-tocopherol concentration did not show definite seasonal trends, nor correlation with solar radiation or average temperature. Nevertheless, tomatoes harvested in mid-summer were characterized by lowered lycopene levels. Greenhouse growing conditions induced the accumulation of relatively high level of antioxidants for most of the year: one serving of raw tomatoes (100 g) could provide from 50% to 120% of the recommended daily intake of vitamin C, from 13% to 27% of that of vitamin A, from 0.4% to 12% of that of vitamin E, and from 15% to 35% of the flavonoid daily intake estimated for an Italian diet. (c) 2005 Elsevier Inc. All rights reserved.