Abstract
Abstract ‘Sucrier’ bananas (Musa acuminata , AA Group) show peel spotting when the peel is just about as yellow as green, which coincides with optimum eating quality. As consumers might relate the spotting to overripe fruit, early spotting is considered undesirable, especially for export markets. Fruit were left uncoated (controls) or coated with polyethylene parafilm wax at concentrations of 20%, 25%, and 30% (v/v) and then held at 29–30°C for 5 days. Compared with controls, each of the concentrations delayed early peel spotting. Eating quality was not affected by the 20% coating, but was negatively affected by the higher concentrations. Further tests, using 20% coating, showed that the delay of peel spotting was not associated with a change in peel total free phenolics or with polyphenol oxidase (PPO) activity, but it was accompanied by reduced in vitro phenylalanine ammonia lyase (PAL) activity. Results suggest that the delay in peel spotting, after surface coating, is a result, at least in part, of reduced PAL activity. Low rate of oxygen diffusion through the coating might be the factor that limits the last step to blackening.
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Claims 6
Claim · model-written summary
Each coating concentration delayed early peel spotting versus controls.
Verbatim
e0“Compared with controls, each of the concentrations delayed early peel spotting”
t0“banana”
Claim · model-written summary
The 20% coating did not affect eating quality.
Not reportedComparator
Verbatim
e0“Eating quality was not affected by the 20% coating”
t0“banana”
Claim · model-written summary
Higher coating concentrations negatively affected eating quality.
Not reportedComparator
Verbatim
e0“Eating quality was not affected by the 20% coating, but was negatively affected by the higher concentrations”
t0“banana”
Claim · model-written summary
The 20% coating delayed spotting without a change in peel total free phenolics.
Verbatim
e0“Further tests, using 20% coating, showed that the delay of peel spotting was not associated with a change in peel total free phenolics”
t0“banana”
Claim · model-written summary
The 20% coating delayed spotting without a change in PPO activity.
Verbatim
e0“Further tests, using 20% coating, showed that the delay of peel spotting was not associated with a change in peel total free phenolics or with polyphenol oxidase (PPO) activity”
t0“banana”
Claim · model-written summary
Delayed spotting accompanied reduced PAL activity.
Verbatim
e0“it was accompanied by reduced in vitro phenylalanine ammonia lyase (PAL) activity”
t0“banana”
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