Postharvest changes in quality characteristics, antioxidant activity and bioactive compounds of peach and nectarine cultivars [Prunus persica (L.) Batsch]
Published 2015-09-30
Keywords
- acidity,
- carotenoids,
- color,
- DPPH,
- firmness
- Folin-Ciocalteau,
- hue,
- phenolics ...More
How to Cite
Abstract
Three peach (‘Honora’, ‘Dr. Davis’ and ‘Fairtime’) and five nectarine (‘Maria Anna’, ‘Diamond Ray’, ‘Fairline’, ‘Nectaross’, ‘Sweet Red’) cultivars were analyzed at harvest and after a postharvest ripening period. Physicochemical characteristics [peel ground color (L*,C*, h°), soluble solids content (SSC), flesh firmness and titratable acidity (TA)], the concentration of some bioactive compounds [total phenol content (TPC) and total carotenoids (TC)] and the total antioxidant activity (TAA) were evaluated at harvest and after a shelf-life period of five days at 20 °C. Phenolic compounds and antioxidant activity were assayed on two different extracts of each sample: ethanol/HCl and ethanol/acetone. After shelf-life, all the cultivars showed a decrease in firmness and an increase in the ratio SSC/TA. The h° parameter of the peel background color had a good correlation with firmness, SSC, TA and the ratio SSC/TA in some of the cultivars, but no relationships were found in the white-fleshed varieties and in two of the nectarines evaluated. The trend of the carotenoids content after postharvest ripening was found to be cultivar-dependent, while TAA or TPC showed an increase in nectarines and remained unchanged in peaches. The ethanol/acetone mix was able to extract almost the double of antioxidant compounds with respect to the ethanol/HCl extract.