Abstract
Abstract A hot air treatment was applied to broccoli ( Brassica oleracea L. var. italica ) florets and its effect on chlorophyll catabolism during postharvest senescence was analyzed. Florets were treated at 48 °C for 3 h and then placed in darkness at 20 °C. During storage, the yellowing of florets occurred simultaneously with a decrease in chlorophylls and an increase in pheophytins. Heat treatment delayed the appearance of yellowing by 2–3 days and a similar extension of shelf‐life could be inferred. Also, the treatment delayed the onset of chlorophyll catabolism and slowed both the rate of chlorophyll a degradation and pheophytin accumulation. No effect on chlorophyll b degradation was found. Chlorophyllase and Mg‐dechelatase activities increased from the first day of storage in untreated florets, whereas peroxidase‐linked chlorophyll bleaching activity increased from day 3. In heat‐treated florets, chlorophyllase activity did not increase until day 2 and then increased at lower rate than in controls. Mg‐dechelatase and peroxidase‐linked chlorophyll bleaching activities were similar in treated and control florets during the first 2 days of storage, but thereafter the activity of both enzymes was lower in heat‐treated samples. In conclusion, a treatment at 48 °C for 3 h delayed chlorophyll a catabolism in broccoli during postharvest senescence and decreased the activities of chlorophyllase, Mg‐dechelatase and peroxidase, three of the enzymes probably involved in chlorophyll degradation in plants. Copyright © 2006 Society of Chemical Industry
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Claims 10
Claim · model-written summary
Broccoli floret yellowing coincided with declining chlorophylls and increasing pheophytins.
- Taxon
- broccoli
Brassica oleracea var. italicat0 - Outcome
- yellowing of floretse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the yellowing of florets occurred simultaneously with a decrease in chlorophylls and an increase in pheophytins”
t0“broccoli”
Claim · model-written summary
Heat treatment delayed broccoli floret yellowing by 2–3 days.
- Taxon
- broccoliBrassica oleracea var. italicat0
- Treatment
- Heat treatmente0
- Outcome
- yellowinge0
- Direction
- delayede0
- Value
- 2–3 dayse0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Heat treatment delayed the appearance of yellowing by 2–3 days”
t0“broccoli”
Claim · model-written summary
Heat treatment delayed onset of chlorophyll catabolism in broccoli.
- Taxon
- broccoliBrassica oleracea var. italicat0
- Treatment
- the treatmente0
- Outcome
- chlorophyll catabolisme0
- Direction
- delayede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“the treatment delayed the onset of chlorophyll catabolism”
t0“broccoli”
Claim · model-written summary
Heat treatment slowed broccoli chlorophyll a degradation.
- Taxon
- broccoliBrassica oleracea var. italicat0
- Outcome
- rate of chlorophyll a degradatione0
- Direction
- slowede0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“slowed both the rate of chlorophyll a degradation and pheophytin accumulation”
t0“broccoli”
Claim · model-written summary
Heat treatment slowed broccoli pheophytin accumulation.
- Taxon
- broccoliBrassica oleracea var. italicat0
- Outcome
- pheophytin accumulatione0
- Direction
- slowede0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“slowed both the rate of chlorophyll a degradation and pheophytin accumulation”
t0“broccoli”
Claim · model-written summary
Heat treatment did not affect broccoli chlorophyll b degradation.
- Taxon
- broccoliBrassica oleracea var. italicat0
- Outcome
- chlorophyll b degradatione0
- Direction
- No effecte0
Not reportedTreatmentComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“No effect on chlorophyll b degradation was found”
t0“broccoli”
Claim · model-written summary
Untreated florets showed increased chlorophyllase and Mg-dechelatase activities from the first storage day.
- Taxon
- broccoliBrassica oleracea var. italicat0
- Outcome
- Chlorophyllase and Mg‐dechelatase activitiese0
- Direction
- increasede0
- Qualifier
- untreated floretse0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Chlorophyllase and Mg‐dechelatase activities increased from the first day of storage in untreated florets”
t0“broccoli”
Claim · model-written summary
Untreated florets showed increased peroxidase-linked chlorophyll bleaching activity from day 3.
- Taxon
- broccoliBrassica oleracea var. italicat0
- Outcome
- peroxidase‐linked chlorophyll bleaching activitye0
- Direction
- increasede0
- Qualifier
- day 3e0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“peroxidase‐linked chlorophyll bleaching activity increased from day 3”
t0“broccoli”
Claim · model-written summary
Heat-treated florets had delayed and slower chlorophyllase activity increases than controls.
- Taxon
- broccoliBrassica oleracea var. italicat0
- Outcome
- chlorophyllase activitye0
- Direction
- lower ratee0
- Qualifier
- day 2e0
- Comparator
- controlse0
Not reportedTreatment
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“chlorophyllase activity did not increase until day 2 and then increased at lower rate than in controls”
t0“broccoli”
Claim · model-written summary
After two storage days, heat-treated florets had lower Mg-dechelatase and peroxidase-linked chlorophyll bleaching activities than controls.
- Taxon
- broccoliBrassica oleracea var. italicat0
- Treatment
- heat‐treated samplese0
- Outcome
- activity of both enzymese0
- Direction
- lowere0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“thereafter the activity of both enzymes was lower in heat‐treated samples”
t0“broccoli”
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See all 13 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.