Abstract
The objective was to study the effect of alginate coating on polyphenol oxidase (PPO) activity and colour of ‘Starking’ apple cubes during dehydration with hot air. Apple cubes were dehydrated at 20oC, 35oC, or 40oC, with a parallel airflow. Analysis of PPO activity, colour (L*, a*, b*) and dry matter were performed along the dehydration process at each temperature. All samples presented a peak in relative PPO activity in the beginning of the drying. Exponential models fitted well the experimental data after the peak. Cubes without coating presented lower PPO activity, suggesting lower browning, than coated samples throughout the dehydration process, for all temperatures. Better results for coated samples were obtained with a perpendicular airflow drying at 40oC, after dipping the whole apple in water at 60oC for 10 min. In order to prevent coated samples from browning, drying by perpendicular airflow preceded by a thermal treatment of the whole apple is required.
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Claims 5
Claim · model-written summary
Uncoated apple cubes had lower PPO activity than coated cubes throughout dehydration at all temperatures, suggesting lower browning.
- Taxon
- apple
Malus domesticat0 - Treatment
- alginate coatinge0
- Outcome
- PPO activitye1
- Direction
- lowere1
- Qualifier
- for all temperaturese1
- Comparator
- Cubes without coatinge1
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“‘Starking’ Apple Cubes”
e0“effect of alginate coating on polyphenol oxidase (PPO) activity”
e1“Cubes without coating presented lower PPO activity, suggesting lower browning, than coated samples throughout the dehydration process, for all temperatures”
Claim · model-written summary
All apple cube samples showed a peak in relative PPO activity at the beginning of drying.
- Taxon
- appleMalus domesticat0
- Outcome
- peak in relative PPO activitye2
- Qualifier
- in the beginning of the dryinge2
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“‘Starking’ Apple Cubes”
e2“All samples presented a peak in relative PPO activity in the beginning of the drying”
Claim · model-written summary
Exponential models fitted the experimental PPO data well after the activity peak.
- Taxon
- appleMalus domesticat0
- Outcome
- experimental data after the peake3
- Qualifier
- fitted welle3
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“‘Starking’ Apple Cubes”
e3“Exponential models fitted well the experimental data after the peak”
Claim · model-written summary
Drying by perpendicular airflow preceded by a thermal treatment of the whole apple is required to prevent browning of coated samples.
- Taxon
- appleMalus domesticat0
- Treatment
- drying by perpendicular airflow preceded by a thermal treatment of the whole applee4
- Outcome
- prevent coated samples from browninge4
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“‘Starking’ Apple Cubes”
e4“In order to prevent coated samples from browning, drying by perpendicular airflow preceded by a thermal treatment of the whole apple is required”
Claim · model-written summary
Better results for coated samples were obtained with perpendicular airflow drying at 40 degrees C after dipping the whole apple in water at 60 degrees C for 10 min.
- Taxon
- appleMalus domesticat0
- Treatment
- perpendicular airflow drying at 40oC, after dipping the whole apple in water at 60oC for 10 mine5
- Outcome
- Better results for coated samplese5
Organisms pictured · Representative pictures of the matched species, not figures from the paper.
Verbatim
t0“‘Starking’ Apple Cubes”
e5“Better results for coated samples were obtained with a perpendicular airflow drying at 40oC, after dipping the whole apple in water at 60oC for 10 min”
The same questions in other papers
storage · physiology: antioxidant enzymes · Malus domestica (apple)Positive and negative results
9 papers in the same direction as this paper · 5 in the opposite direction
- negative
- no effect
- no effect
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See all 15 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.