New Zealand Journal of Crop and Horticultural Science abstracts
Reduced greasiness of `Granny Smith' apples
washed in Tween 20 solution
B. K. DADZIE*
N. H. BANKS
E. W. HEWETT
Department of Plant Science
Massey University
Private Bag 11222
Palmerston North, New Zealand
D. J. CLELAND
Department of Process and Environmental
Technology
Massey University
Private Bag 11222
Palmerston North, New Zealand
*Present address: Fundacion Hondurena de Investigacion Agricola, Apartado
Postal 2067, Honduras.
Abstract `Granny Smith' apples (Malus domestica
Borkh.) tend to develop greasy skins after extended storage which makes them
slippery to touch and reduces their aesthetic appeal. Washing fruit in 0.15%
(w/w) Tween 20 surfactant solution reduced greasiness, loss of greenness, and
firmness after 22 days at 20deg.C. These effects were associated with
decreased skin permeance to gases, depressed internal oxygen (O2) partial
pressure and respiration, and increased internal partial pressure of ethylene,
in washed compared to control fruit. Washing depressed the sum of O2 and carbon
dioxide partial pressures, suggesting that this treatment enhanced differential
permeability characteristics of the fruit skin. Pre-treatment by wiping without
using Tween 20 solution had none of these effects but stimulated weight loss.
The potential for using a surface coating to delay the development of
greasiness in stored apples should be re-examined.
Keywords apple; Malus domestica; skin permeance;
internal atmosphere; oxygen; carbon dioxide; ethylene; respiration; firmness;
colour
New Zealand Journal of Crop and Horticultural Science, 1995, Vol. 23:
219-222
0114-0671/95/2302--0219 $2.50/0 (c) The Royal Society of New Zealand
1995
Short communication
PDF file of entire paper: medium quality (290K); (scanned from paper original: notes about this process)
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