Effect of modified atmosphere on phytochemical profile of pasteurized peach purées
2015
Oliveira, Ana | Coelho de Medici, Marta | Alexandre, Elisabete M.C. | Gomes, Maria Helena | Almeida, Domingos P.F. | Pintado, Manuela
Peach phytochemical profile was analysed during 90 days storage under three different gas mixtures: 10 kPa O2 + 90 kPa N2, 100 kPa N2 and air (78 kPa N2 + 21 kPa O2 + 0.03 kPa CO2) for both 4 and 23 °C.The antioxidant activity increased when peach purée was stored under air at 4 °C and 100 kPa N2 at 23 °C, while total phenolic content was not affected by atmospheres. Total carotenoids were more stable for 100 kPa N2, where it decreases 48 and 58% respectively for 4 and 23 °C.The content of (+)-catechin decreased 42% for 10 kPa O2 at 4 °C, remaining constant in other atmospheres. Chlorogenic and neochlorogenic acids were well preserved in atmospheres containing oxygen, presenting an increase of 14 and 24% for 10 kPa O2 at 4 °C. The higher content of carotenoids was obtained for 100 kPa N2 at 23 °C.Principal component analysis shows that atmospheres variance was associated with carotenoids while storage time was more related with total phenolics and total antioxidant capacity.
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