Quality of Tomato Ferti Lized with Nitrogen

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Submitted By Rachae
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The influence of different levels of nitrogen (N1, N2), phosphorous (P1, P2) and N+P (N1P1, N1P2, N2P1, N2P2) mixed fertilizers was investigated on volatile substances, soluble sugars, organic acids, titratable acidity, dry matter and lycopene of “Corbarino” cherry-like tomatoes. The flavor volatiles reached the highest concentrations in red-ripe cherry-like tomatoes treated with N1. Glucose, fructose, dry matter and titratable acidity increased only in N+P fertilized samples. Among the organic acids, citric increased, malic decreased and oxalic was constant in all the fertilized samples. Lycopene reached the highest values in N2 and N2P2 samples.

Tomato, a key vegetable in the Italian Mediterranean diet, has recently gaining been attention in relation to the prevention of some human diseases. This interest is due to the presence of carotenoids and particularly lycopene, which is an unsaturated alkylic compound that appears to be an active compound in the prevention of cancer and cardiovascular risk and in slowing down cellular aging, owing to its high antioxidant and antiradical power (GERSTER 1997; GIOVANNUCCI et al. 1995). Lycopene is found in fresh, redripe tomatoes as all-trans (79-91%) and cis- (9-21%) isomers (STAHH and SIES, 1992; SHI et al.
1999; BOILEAU et al. 2002). Lycopene and vitamins give a measure of the nutraceutical quality, while flavour volatiles, soluble sugars, organic acids, etc. express the nutritional quality.
In red-ripe tomato fruit, many volatile compounds have been identified [2(E)-hexenal, hexanal, 3(Z)-hexen-1-ol, β-ionone, 2(E)4(Z)-decadienal, 2 isobutylthiazole, 3(Z)-hexenol, linalool, methylsalicylate, 2-methoxyphenol, 6-methyl- 5-hepten-2-one, 6-methyl-5-hepten-2-ol, 2,3-epoxygeranial, neral, geranial, nerylacetone, β-damascenone,…...

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