Differences in the structural response of 'granny-smith' apples under mechanical impact and compression

Rodriguez, L. and Ruiz-Altisent, Margarita and Felipe, M.R. de (1990). Differences in the structural response of 'granny-smith' apples under mechanical impact and compression. "Journal of Texture Studies", v. 21 (n. 2); pp. 155-164. ISSN 0022-4901.

Description

Title: Differences in the structural response of 'granny-smith' apples under mechanical impact and compression
Author/s:
  • Rodriguez, L.
  • Ruiz-Altisent, Margarita
  • Felipe, M.R. de
Item Type: Article
Título de Revista/Publicación: Journal of Texture Studies
Date: 1990
ISSN: 0022-4901
Volume: 21
Subjects:
Faculty: E.T.S.I. Agrónomos (UPM) [antigua denominación]
Department: Ingeniería Rural [hasta 2014]
UPM's Research Group: LPF-TAGRALIA
Creative Commons Licenses: Recognition - No derivative works - Non commercial

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Abstract

Apple fruits, cv. Granny Smith, were subjected to mechanical impact and compression loads utilizing a steel rod with a spherical tip 19 mm diameter, 50.6 g mass. Energies applied were low enough to produce enzymatic reaction: 0.0120 J for impact, and 0.0199 J for compression. Bruised material was cut and examined with a transmission electron microscope. In both compression and impact, bruises showed a central region located in the flesh parenchyma, at a distance that approximately equalled the indentor tip radius. The parenchyma cells of this region were more altered than cells from the epidermis and hypodermis. Tissues under compression presented numerous deformed parenchyma cells with broken tonoplasts and tissue degradation as predicted by several investigators. The impacted cells supported different kinds of stresses than compressed cells, resulting in the formation of intensive vesiculation, either in the vacuole or in the middle lamella region between cell walls of adjacent cells. A large proportion of parenchyma cells completely split or had initiated splitting at the middle lamella. Bruising may develop with or without cell rupture. Therefore, cell wall rupture is not essential for the development of a bruise, at least the smallest one, as predicted previously

More information

Item ID: 16265
DC Identifier: http://oa.upm.es/16265/
OAI Identifier: oai:oa.upm.es:16265
Deposited by: Servicio Biblioteca Universitaria
Deposited on: 08 Jul 2013 11:06
Last Modified: 21 Apr 2016 16:34
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