Abstract
In this study, the influence of postharvest UV-C irradiation on phenolic compounds, enzymatic and non-enzymatic antioxidants was assessed in table grape “Thompson Seedless” during short storage. The berries were exposed to UV-C at doses of 0, 0.8, 1.2, and 4.2 kJ/m2 and then stored at 15°C for 6 d to simulate retail condition. The result showed that UV-C treatment increased total phenolic content of the skin at the harvest time and its level remain unchanged during storage. Total flavonoid content of treated berries, however, dramatically increased. The increasing impact of UV-C on antioxidant activity of treated berries was evident; however, it varies in different assays performed. In contrast with PPO controlled under the lower doses of radiation, activity of PAL and POD were induced after irradiation. Similar to total phenolics, individual ones including catechin, quercetin, and rutin were largely affected by UV-C irradiation (especially at the doses of 0.8 and 1.2 kJ/m2), except epicatechin. These results indicated that mild doses of UV-C irradiation augmented the antioxidant capacity of table grapes, given a correlation between polyphenol content and these characteristics. Furthermore, along with the increased antioxidant enzymes, UV-C treatment could enhance berry tolerance to biotic and abiotic stress, which seems to need further research. Novelty impact statement Total phenols, flavonoids, and antioxidant potential of table grapes increased after UV-C irradiation. Although PAL and POD activity was increased under UV-C irradiation, lower doses of UV-C restricted the PPO activity. Contrary to epicatechin and resveratrol, UV-C irradiation induced catechin, quercetin, and rutin.
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Claims 8
Claim · model-written summary
UV-C increased grape skin total phenolics at harvest, with the level unchanged during storage.
- Taxon
- grapet0
- Organ / stage
- skine0
- Treatment
- UV-C treatmente0
- Outcome
- total phenolic contente0
- Direction
- increasede0
- Qualifier
- at the harvest time and its level remain unchanged during storagee0
Not reportedComparator
Verbatim
e0“UV-C treatment increased total phenolic content of the skin at the harvest time and its level remain unchanged during storage”
t0“grape”
Claim · model-written summary
UV-C dramatically increased total flavonoids in treated berries.
Not reportedComparator
Verbatim
e0“Total flavonoid content of treated berries, however, dramatically increased”
t0“grape”
e1“UV-C treatment increased total phenolic content”
Claim · model-written summary
UV-C increased antioxidant activity, with effects varying by assay.
- Taxon
- grapet0
- Treatment
- UV-Ce0
- Outcome
- antioxidant activitye0
- Direction
- increasinge0
- Qualifier
- varies in different assays performede0
Not reportedComparator
Verbatim
e0“increasing impact of UV-C on antioxidant activity of treated berries was evident; however, it varies in different assays performed”
t0“grape”
Claim · model-written summary
Lower UV-C doses restricted PPO activity.
Not reportedComparator
Verbatim
e0“lower doses of UV-C restricted the PPO activity”
t0“grape”
Claim · model-written summary
UV-C increased PAL and POD activity.
- Taxon
- grapet0
- Treatment
- UV-C irradiatione0
- Gene
- PAL and PODe0
- Outcome
- PAL and POD activitye0
- Direction
- increasede0
Not reportedComparator
Verbatim
e0“PAL and POD activity was increased under UV-C irradiation”
t0“grape”
Claim · model-written summary
UV-C induced catechin, quercetin, and rutin.
Not reportedComparator
Verbatim
e0“UV-C irradiation induced catechin, quercetin, and rutin”
t0“grape”
Claim · model-written summary
Epicatechin and resveratrol were exceptions to the UV-C induction.
Not reportedComparatorDirection
Verbatim
e0“Contrary to epicatechin and resveratrol, UV-C irradiation induced catechin, quercetin, and rutin”
t0“grape”
Claim · model-written summary
Authors inferred mild UV-C doses augment grape antioxidant capacity, associated with polyphenols.
Verbatim
e0“mild doses of UV-C irradiation augmented the antioxidant capacity of table grapes, given a correlation between polyphenol content and these characteristics”
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See all 26 papers →Claims are grouped by organism, treatment and what was measured or targeted. A paper counts as positive when any of its claims in the group is positive.