Table 4 presents the values for antioxidant activity and total
phenolic and flavonoid contents of the watercress extracts. From
the one-way ANOVA p-values, it can be concluded that the assayed
packaging atmospheres induced significant changes in these
parameters. Non-stored control samples showed the highest
DPPH scavenging activity, reducing power and b-carotene
blanching inhibition capacity. Regarding the assayed packaging
atmospheres, Ar-enriched MAP were the best treatment to
preserve the DPPH scavenging activity and b-carotene blanching
inhibition capacity, showing also an increase in the total phenolics
content. In turn, samples under N2-enriched MAP present lower
lipid peroxidation inhibition capacity, despite the high levels of
total phenolics and flavonoids. The TBARS formation inhibition
capacity was improved by conventional packaging relatively to the
non-stored control samples. However, air-packaging gave the
highest EC50 values (corresponding to the lowest antioxidant
activity) in the DPPH and reducing power assays.
Similar phenolic (96–97 g GAE kg1 extract) and higher flavonoid
(62–63 g CE kg1 extract) contents were reported by Yazdanparast
et al. (2008) and Bahramikia and Yazdanparast (2010) in
hydro-ethanolic extracts of a watercress sample from Iran, as well
as analogous TBARS inhibition properties (0.27 g L1
). On
Table 4 presents the values for antioxidant activity and totalphenolic and flavonoid contents of the watercress extracts. Fromthe one-way ANOVA p-values, it can be concluded that the assayedpackaging atmospheres induced significant changes in theseparameters. Non-stored control samples showed the highestDPPH scavenging activity, reducing power and b-caroteneblanching inhibition capacity. Regarding the assayed packagingatmospheres, Ar-enriched MAP were the best treatment topreserve the DPPH scavenging activity and b-carotene blanchinginhibition capacity, showing also an increase in the total phenolicscontent. In turn, samples under N2-enriched MAP present lowerlipid peroxidation inhibition capacity, despite the high levels oftotal phenolics and flavonoids. The TBARS formation inhibitioncapacity was improved by conventional packaging relatively to thenon-stored control samples. However, air-packaging gave thehighest EC50 values (corresponding to the lowest antioxidantactivity) in the DPPH and reducing power assays.Similar phenolic (96–97 g GAE kg1 extract) and higher flavonoid(62–63 g CE kg1 extract) contents were reported by Yazdanparastet al. (2008) and Bahramikia and Yazdanparast (2010) inhydro-ethanolic extracts of a watercress sample from Iran, as wellas analogous TBARS inhibition properties (0.27 g L1). On
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