Abstract
UV light is an important stimulator for bioactive secondary plant metabolites. Short-term postharvest applications are thought to enhance their concentration. Postharvest treatments with PAR light (control), UV-B (310 nm for 0.5 h, to 2 h), and two UV-A wavelengths (340 nm and 365 nm for 1.5 h, to 6 h) were applied to baby leaves of lettuce and chicory. Short-term UV-B (0.5 h and 1 h) and UV-A (1.5 h and 2 h) treatments achieved the highest accumulation of phenolic acids e.g. chicoric acid and sesquiterpene lactones e.g. 11(S),13-dihydro-8-deoxylactucin, in both lettuce and chicory. In chicory, chlorogenic acid levels increased with prolonged UV-A radiation. In addition, flavonoid glycosides were induced by both UV-B and UV-A light in chicory. These changes were accompanied by enhanced antioxidant activity after short-term postharvest UV treatments. UV-B (1 h) and UV-A (2 h) resulted in the highest levels of lutein and β -carotene in both lettuce and chicory. These findings underscore that short-term UV-B and UV-A treatments effectively modulate the concentration of bioactive compounds. Changes in sesquiterpene lactone concentrations may also have an impact on taste and consumer acceptance. Postharvest UV treatment can be applied as more cost effective and reliable than preharvest treatments, making them a real opportunity for commercial applications.
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Claims 8
Claim · model-written summary
In lettuce, short-term UV-B (0.5 h and 1 h) and UV-A (1.5 h and 2 h) treatments achieved the highest accumulation of phenolic acids and sesquiterpene lactones compared with PAR light control.
- Taxon
- lettuce
Lactuca sativae0 - Treatment
- Short-term UV-B (0.5 h and 1 h) and UV-A (1.5 h and 2 h) treatmentse0
- Outcome
- phenolic acids e.g. chicoric acid and sesquiterpene lactonese0
- Direction
- higheste0
- Comparator
- PAR light (control)e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Short-term UV-B (0.5 h and 1 h) and UV-A (1.5 h and 2 h) treatments achieved the highest accumulation of phenolic acids e.g. chicoric acid and sesquiterpene lactones e.g. 11(S),13-dihydro-8-deoxylactucin, in both lettuce and chicory”
e1“PAR light (control)”
Claim · model-written summary
In chicory, short-term UV-B (0.5 h and 1 h) and UV-A (1.5 h and 2 h) treatments achieved the highest accumulation of phenolic acids and sesquiterpene lactones compared with PAR light control.
- Taxon
- chicory
Cichorium intybuse0 - Treatment
- Short-term UV-B (0.5 h and 1 h) and UV-A (1.5 h and 2 h) treatmentse0
- Outcome
- phenolic acids e.g. chicoric acid and sesquiterpene lactonese0
- Direction
- higheste0
- Comparator
- PAR light (control)e1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Short-term UV-B (0.5 h and 1 h) and UV-A (1.5 h and 2 h) treatments achieved the highest accumulation of phenolic acids e.g. chicoric acid and sesquiterpene lactones e.g. 11(S),13-dihydro-8-deoxylactucin, in both lettuce and chicory”
e1“PAR light (control)”
Claim · model-written summary
In chicory, chlorogenic acid levels increased with prolonged UV-A radiation.
- Taxon
- chicoryCichorium intybuse0
- Treatment
- prolonged UV-A radiatione0
- Outcome
- chlorogenic acid levelse0
- Direction
- increasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“In chicory, chlorogenic acid levels increased with prolonged UV-A radiation”
Claim · model-written summary
In chicory, flavonoid glycosides were induced by both UV-B and UV-A light.
- Taxon
- chicoryCichorium intybuse0
- Treatment
- both UV-B and UV-A lighte0
- Outcome
- flavonoid glycosidese0
- Direction
- inducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“flavonoid glycosides were induced by both UV-B and UV-A light in chicory”
Claim · model-written summary
Antioxidant activity was enhanced after short-term postharvest UV treatments.
- Taxon
- leafy vegetablest0
- Treatment
- short-term postharvest UV treatmentse0
- Outcome
- antioxidant activitye0
- Direction
- enhancede0
Not reportedComparator
Verbatim
e0“enhanced antioxidant activity after short-term postharvest UV treatments”
t0“leafy vegetables”
Claim · model-written summary
In lettuce, UV-B (1 h) and UV-A (2 h) resulted in the highest levels of lutein and β-carotene.
- Taxon
- lettuceLactuca sativae0
- Treatment
- UV-B (1 h) and UV-A (2 h)e0
- Outcome
- levels of lutein and β -carotenee0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“UV-B (1 h) and UV-A (2 h) resulted in the highest levels of lutein and β -carotene in both lettuce and chicory”
Claim · model-written summary
In chicory, UV-B (1 h) and UV-A (2 h) resulted in the highest levels of lutein and β-carotene.
- Taxon
- chicoryCichorium intybuse0
- Treatment
- UV-B (1 h) and UV-A (2 h)e0
- Outcome
- levels of lutein and β -carotenee0
- Direction
- higheste0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“UV-B (1 h) and UV-A (2 h) resulted in the highest levels of lutein and β -carotene in both lettuce and chicory”
Claim · model-written summary
Postharvest UV treatment can be applied as more cost effective and reliable than preharvest treatments.
Verbatim
e0“Postharvest UV treatment can be applied as more cost effective and reliable than preharvest treatments”
t0“leafy vegetables”
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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.