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Modelling the firmness of "Elstar" apples during storage and transport.

Author(s) : TIJSKENS L. M. M., SCHAIK A. C. R. van, JAGER A. de

Summary

A dynamic model has been developed that describes the decrease in firmness of "Elstar" apples, based on the general knowledge how firmness is affected by chemical and biochemical reactions. The variable part of the firmness of apples is deduced to depend mainly on the pectic compounds in the middle lamellae. These pectic compounds are supposed to decay during storage in two distinct routes, one consuming/needing oxygen and one occurring with or without oxygen. During controlled atmosphere (CA) or modified atmosphere (MA) storage, an enzyme, probably polygalacturonase, accumulates depending on the length of the CA/MA period: the longer kept at CA/MA conditions, the faster firmness decays at the end of the storage period. On top of all those interactions, a temperature dependence is applied on all individual reaction rates.

Details

  • Original title: Modelling the firmness of "Elstar" apples during storage and transport.
  • Record ID : 2000-1953
  • Languages: English
  • Source: Proceedings of the International Symposium on effect of preharvest and postharvest factors on storage of fruit.
  • Publication date: 1999/03
  • Document available for consultation in the library of the IIR headquarters only.

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