Acta Alimentaria
Volume/Issue:
Volume 33: Issue 3
The effect of harvesting time on the biochemical and ultrastructural changes in Idared apple
Authors: E. Kovács 1 and P. Merész 2
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  • 1 Department of Microbiology, Central Food Research Institute H-1022 Budapest, Herman Ottó út 15. Hungary
  • 2 Department of Biochemistry and Food Technology, Budapest University of Technology and Economics H-1111 Budapest, Műegyetem rpt. 3. Hungary
DOI:
https://doi.org/10.1556/aalim.33.2004.3.9
Page Count:
285–296
Publication Date:
01 Sep 2004
Online Publication Date:
19 Jul 2005
Article Category:
Research Article
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Apples were harvested at three different times (1 st, 2 nd and 3 rd) then stored at 1-3 °C, 85-90% R.H. for 5 months. Firmness, ethylene productivity, the distribution of calcium and potassium and the ion leakage were measured. The ultrastructure of the cell wall was studied by SEM and TEM and he activity of β-galactosidase and polygalacturonase and pectin content were determined. The ethylene evolution of fruits decreased by the harvest and storage time. At the beginning of storage, the ethylene productivity in the 1 st harvest apple increased up to a maximum value then declined. The 2 nd harvest fruits produced less ethylene than that observed in 1 st harvest fruits. No ethylene production was found in the 3 rd harvest fruits. Firmness was different according to harvest time, but that difference disappeared during storage. The permeability of membranes increased as a function of harvests and storage. The distribution of calcium was typical at the beginning, the highest concentration of calcium being near the core and skin, but by the end of the storage calcium moved from the skin towards the core. Potassium content was the highest near the core and decreased towards the skin, both in the fresh and stored apples. The activities of polygalacturonase and β -galactosidase were not influenced by the harvest time, but changed as a function of storage time. The autolysis of pectin and soluble carbohydrates increased during storage, mostly in the 3 rd harvest. At the beginning of storage, the cell wall and middle lamellae of the 1 st harvest fruits' flesh were not damaged. Large degradation of the middle lamellae was observed in the 2 nd and 3 rd harvest fruits. Lower membrane permeability, pectin degradation and PG enzyme activity were found in the 1 st harvest apples. The Idared apple should be harvested close to the climacteric maximum for better and longer storage.

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Cover Acta Alimentaria
Acta Alimentaria
Print ISSN:
0139-3006
Online ISSN:
1588-2535
Keywords:
ultrastructure; ultrastructure; apple; pectin; polygalacturonase; galactosidase; membrane permeability; calcium/potassium

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