Abstract
Abstract The effects of three treatments, 1 mg L −1 ozone at 18–20 °C, 15 g L −1 calcium lactate (CLac) at 50 °C and a combination thereof, were compared on fresh‐cut lettuce over 10 days of refrigerated storage. Respiration rate, browning and texture were examined as main quality indicators. The use of ozone produced a significantly ( P < 0.05) higher oxygen decline than the use of CLac (from day 3 to day 10). At the end of storage, CLac (alone or combined with ozone) samples had higher oxygen content (∼9%) than ozone samples (∼6%). Enzymatic activity decreased significantly ( P < 0.05) in ozone samples. Polyphenol oxidase activity in fresh‐cut lettuce treated with ozone (alone or combined with CLac) showed lower values on day 1 (<2500 units g −1 ) and at the end of storage (<3000 units g −1 ) than CLac samples (4000–4800 units g −1 ). Ozone also reduced peroxidase activity to ∼300 units g −1 after treatment. Finally, pectin methylesterase activity was also reduced with ozone, showing a negative effect on textural properties. Data suggested that CLac maintained quality markers better than treatments with ozone and ozone/CLac combination over 10 days of storage. Copyright © 2006 Society of Chemical Industry
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Claims 7
Claim · model-written summary
Ozone caused a significantly higher oxygen decline than calcium lactate from day 3 to 10.
- Taxon
- lettuce
Lactuca sativat0 - Treatment
- ozonee0
- Outcome
- oxygen declinee0
- Direction
- highere0
- Comparator
- CLace0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“The use of ozone produced a significantly ( P < 0.05) higher oxygen decline than the use of CLac (from day 3 to day 10).”
t0“lettuce”
Claim · model-written summary
Calcium lactate alone or with ozone retained about 9% oxygen at storage end, versus about 6% for ozone.
- Taxon
- lettuceLactuca sativat0
- Treatment
- CLac (alone or combined with ozone)e0
- Outcome
- oxygen contente0
- Direction
- highere0
- Value
- ∼9%e0
- Qualifier
- ∼6%e0
- Comparator
- ozone samplese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“At the end of storage, CLac (alone or combined with ozone) samples had higher oxygen content (∼9%) than ozone samples (∼6%).”
t0“lettuce”
Claim · model-written summary
Ozone significantly decreased enzymatic activity.
- Taxon
- lettuceLactuca sativat0
- Treatment
- ozonee0
- Outcome
- Enzymatic activitye0
- Direction
- decreasede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Enzymatic activity decreased significantly ( P < 0.05) in ozone samples.”
t0“lettuce”
Claim · model-written summary
Ozone alone or with calcium lactate produced lower polyphenol oxidase activity than calcium lactate alone on day 1 and at storage end.
- Taxon
- lettuceLactuca sativae0
- Treatment
- ozone (alone or combined with CLac)e0
- Outcome
- Polyphenol oxidase activitye0
- Direction
- lowere0
- Value
- <2500 units g −1e0
- Comparator
- CLac samplese0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Polyphenol oxidase activity in fresh‐cut lettuce treated with ozone (alone or combined with CLac) showed lower values on day 1 (<2500 units g −1 ) and at the end of storage (<3000 units g −1 ) than CLac samples (4000–4800 units g −1 ).”
Claim · model-written summary
Ozone reduced peroxidase activity to about 300 units per gram after treatment.
- Taxon
- lettuceLactuca sativat0
- Treatment
- Ozonee0
- Outcome
- peroxidase activitye0
- Direction
- reducede0
- Value
- ∼300 units g −1e0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“Ozone also reduced peroxidase activity to ∼300 units g −1 after treatment.”
t0“lettuce”
Claim · model-written summary
Ozone reduced pectin methylesterase activity and negatively affected texture.
- Taxon
- lettuceLactuca sativat0
- Treatment
- ozonee0
- Outcome
- pectin methylesterase activitye0
- Direction
- reducede0
Not reportedComparator
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“pectin methylesterase activity was also reduced with ozone, showing a negative effect on textural properties”
t0“lettuce”
Claim · model-written summary
The authors judged calcium lactate to maintain quality markers better than ozone-containing treatments over ten days.
- Taxon
- lettuceLactuca sativat0
- Treatment
- CLace0
- Outcome
- quality markerse0
- Comparator
- treatments with ozone and ozone/CLac combinatione0
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
e0“CLac maintained quality markers better than treatments with ozone and ozone/CLac combination over 10 days of storage”
t0“lettuce”
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ozone · physiology: antioxidant enzymes · Lactuca sativa (garden lettuce)Positive and negative results
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ozone · physiology: enzyme activity · Lactuca sativa (garden lettuce)Positive and negative results
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ozone · molecular: metabolites · Lactuca sativa (garden lettuce)Positive and negative results
1 paper in the same direction as this paper · 1 in the opposite direction
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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.