Effect of freezing and freeze-drying techniques on antioxidant activity of tomato fruits
2006
Lante, A. | Lomolino, G. | Spettoli, P. | Sambo, P. | Gianquinto, G.
إنجليزي. Considering that only a small amount of fruits and vegetables are consumed in their raw state, the evaluation of influence of food processing on naturally occurring antioxidants is a key factor in finding the technological conditions necessary to preserve or improve their original activity and bioavailability. The aim of the present research was to carry out a preliminary study on the effects of freezing and freeze-drying on the antioxidant activity of two types of tomato cultivars, in clusters and oblongs. Results showed that a polyphenolic fraction is mainly present on the fruit skin in both types of tomatoes. It seemed that oblongs tomatoes had better percentage of polyphenols than the ones in clusters after freezing; the differences between the two types seemed to disappear after freeze-drying. About AAT, the results showed that the antioxidant activity was quite low, even if tomatoes in clusters were better than the oblong ones; technological treatments increased, in comparison with raw material, this quality parameter. On the other hand, DPPH radical scavenging activity was stable
اظهر المزيد [+] اقل [-]إيطالي. E' stata studiata l'influenza dei trattamenti tecnologici di congelamento e liofilizzazione sull'attività antiossidante di pomodoro, in diverse cultivar appartenenti a varietà a grappolo e a frutto allungato. Il congelamento sembra non modificare la quantità di antiossidanti estratti, ma anzi potrebbe incrementarla, contribuendo alla liberazione di un'ulteriore frazione di polifenoli presenti nelle pareti cellulari. La liofilizzazione non ha evidenziato effetti negativi sul mantenimento del contenuto di antiossidanti. Questi risultati potrebbero avere un impatto diretto sulle scelte alimentari dei consumatori, evidenziando i benefici legati ad una dieta ricca anche di vegetali trasformati
اظهر المزيد [+] اقل [-]الكلمات المفتاحية الخاصة بالمكنز الزراعي (أجروفوك)
المعلومات البيبليوغرافية
تم تزويد هذا السجل من قبل Istituto di Servizi per il Mercato Agricolo Alimentare