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EnglishThree commercial tomato products (tomato pulp, tomato puree, and tomato paste) were subjected to accelerated aging tests (3 months at 40°C) to evaluate the kinetics of variation of heat damage indexes (5-hydroxymethyl-2- furfural [HMF] and color [?E]) and oxidative damage indexes (lycopene, β-carotene, ascorbic acid, total phenolics, antioxidant activity of hydrophilic and lipophilic fractions). Experimental data were processed to obtain rate constant values. HMF formation followed zero-order kinetics in tomato puree, and paste, and first-order kinetics in tomato pulp, to a final value of nearly 160, 200, and 495 mg/kg dw in tomato pulp, puree, and paste. Significant colour changes were only observed in tomato concentrate. Ascorbic acid decreased in all products according to pseudo-first-order kinetics, with a higher rate in tomato paste and puree. A slight increase in total phenolics was observed in all products during storage. Lycopene concentration was very stable in all products, whereas β-carotene decreased at the same rate in all products, to a final 30-40% reduction. The antioxidant activity of the hydrophilic fraction decreased, to a final reduction of 35-40% in all samples. The antioxidant activity of the lipophilic fraction also decreased, although to a smaller extent, to a final reduction of about 30% in the three products. Reduction of antioxidant activity can be ascribed to the loss in ascorbic acid and β-carotene.
The antioxidant activity of tomato : 4, Effects of storage on oxidative and heat damage / G. Giovanelli, V. Lavelli, C. Peri, A. Pagliarini, B. Zanoni, P. Petrone. - In: ACTA HORTICULTURAE. - ISSN 0567-7572. - 542(2001), pp. 221-226. ((Intervento presentato al 7. convegno International Symposium on the Processing Tomato tenutosi a Sacramento (USA) nel 2001.
| Titolo: | The antioxidant activity of tomato : 4, Effects of storage on oxidative and heat damage |
| Autori: | |
| Parole Chiave: | β-carotene; 5-hydroxymethyl-2-furfural; Antioxidant activity; Ascorbic acid; Color; Lycopene; Polyphenols |
| Settore Scientifico Disciplinare: | Settore AGR/15 - Scienze e Tecnologie Alimentari |
| Data di pubblicazione: | 2001 |
| Rivista: | |
| Enti collegati al convegno: | International Society for Horticultural Science |
| Tipologia: | Article (author) |
| Appare nelle tipologie: | 01 - Articolo su periodico |
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