This item still needs to be validated !
Title: Uncertainty analysis and modelling of the starch index during apple fruit maturation
Authors: Peirs, Ann ×
Scheerlinck, Nico
Perez, AB
Jancsok, Pal
Nicolai, Bart #
Issue Date: Sep-2002
Publisher: Elsevier science bv
Series Title: Postharvest biology and technology vol:26 issue:2 pages:199-207
Abstract: Starch conversion into sugars is one of the most important indicators for predicting the optimal harvest dates for apples. The starch conversion is usually assessed using an iodine test, in which cut fruit are dipped in iodine solution and stain patterns are rated. A methodology based on the image analysis of iodine-treated apple slices was used to quantify the uncertainty on the traditional starch index measurements. Considering the subjective interpretation of different inspectors, the errors for certain image assignments were up to 60%. The averaged values of index assignments of groups of images, however, were for most starch indices not significantly different. It was noticed that the subjective interpretation was related to the high number of indices on the chart, the non-linear scale and a sequence disorder of the reference chart. A modified logistic model was proposed to represent the sigmoidal starch index pattern during the preharvest period by two model parameters. Based on these two parameters, and the recommended starch index at harvest, the optimal harvest date was determined. With this technique, the orchard and cultivar effects were analysed. (C) 2002 Elsevier Science B.V. All rights reserved.
ISSN: 0925-5214
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Division of Mechatronics, Biostatistics and Sensors (MeBioS)
Leuven Statistics Research Centre (LStat)
Division M3-BIORES: Measure, Model & Manage Bioresponses (-)
× corresponding author
# (joint) last author

Files in This Item:

There are no files associated with this item.

Request a copy


All items in Lirias are protected by copyright, with all rights reserved.

© Web of science