Changes in biochemical and qualitative properties in fresh-cut broccoli genotypes during storage
2013
Conversa, G. | Bonasia, A. | Lazzizera, C. | Elia, A.
Content of bioactive compounds in broccoli head varies with genotype, environmental, agronomical, processing, and postharvest conditions. A study was planned to characterize and evaluate changes in fresh (FW) and dry (DW) weight, in antioxidant capacity (AC) and total phenolics (TP) content, in fresh-cut processed florets in seven broccoli cultivars after 7 (T7), 14 (T14), and 21 (T21) days of storage at 5°C in OPP packaging. Head were harvested in early spring from a commercial farm located in Foggia province (southern Italy). Results indicate that at harvest cultivars cv1, cv2, cv3, cv4, cv5, and cv6 showed the highest floret DW content, followed by cv7. Postharvest storage was stopped on day 14 for cv1, cv2, cv3 and cv4, because of strong off-odors produced. At T14, floret DW concentration decreased much more in cv4 than in cv7. Fresh weight loss (WL) was negligible, however cv5 and cv7 showed the lowest values. The main component of total weight loss during storage was the respiratory component being not significant that connected with transpiration. Differences in AC and TP content were detected in raw material. Compared with T0 AC decreased at T7 and increased at T14, particularly in cv1 and cv2. After 7 days of storage TP content was unchanged (except cv3 and cv6), while at T14 increased (except in cv7). No relationship seems to exist between AC and TP, whereas it is possible to suppose that the higher the initial AC the longer the shelf-life of fresh-cut florets.
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