Determination of film requirements and respiratory behaviour of fresh produce in modified atmosphere packaging

Determination of film requirements and respiratory behaviour of fresh produce in modified... A simple technique was developed for determining the respiration rate of produce stored in modified atmosphere packaging (MAP) over the entire storage period including the initial time when the produce responds to the modified atmosphere. It is based on a material balance equation that relates the package film permeability and produce metabolism to the in-package gas concentrations. The equation is particularly useful for determining basic metabolic processes of produce such as respiration and ethylene biosynthesis in actual modified atmosphere packages, even when steady state conditions do not exist. Alternatively, when the respiration rate is known, the film permeability required for MAP can be determined. The work reported here shows there is significant difference between permeability values measured by the ASTM Dow cell method and the mixed gas cell method. It was found that the film permeability must be measured by a mixed gas cell method for the technique to give realistic predictions. When film permeability is determined using this method at the conditions under which the produce is to be stored, it can be used directly in the equation without any need for corrections. The material balance and permeability measurement were tested by determining the metabolic activity of broccoli (cv. ‘Marathon’) stored under MAP (6% CO 2 , 1.5% O 2 ) at 1.5 °C. The steady state oxygen consumption, carbon dioxide production and ethylene biosynthesis were 8.8 ml kg −1 h −1 , 9.0 ml kg −1 h −1 and 0.04 μl kg −1 h −1 , respectively. These measurements agree with published and measured values. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Postharvest Biology and Technology Elsevier

Determination of film requirements and respiratory behaviour of fresh produce in modified atmosphere packaging

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Publisher
Elsevier
Copyright
Copyright © 1995 Elsevier Ltd
ISSN
0925-5214
DOI
10.1016/0925-5214(94)00053-U
Publisher site
See Article on Publisher Site

Abstract

A simple technique was developed for determining the respiration rate of produce stored in modified atmosphere packaging (MAP) over the entire storage period including the initial time when the produce responds to the modified atmosphere. It is based on a material balance equation that relates the package film permeability and produce metabolism to the in-package gas concentrations. The equation is particularly useful for determining basic metabolic processes of produce such as respiration and ethylene biosynthesis in actual modified atmosphere packages, even when steady state conditions do not exist. Alternatively, when the respiration rate is known, the film permeability required for MAP can be determined. The work reported here shows there is significant difference between permeability values measured by the ASTM Dow cell method and the mixed gas cell method. It was found that the film permeability must be measured by a mixed gas cell method for the technique to give realistic predictions. When film permeability is determined using this method at the conditions under which the produce is to be stored, it can be used directly in the equation without any need for corrections. The material balance and permeability measurement were tested by determining the metabolic activity of broccoli (cv. ‘Marathon’) stored under MAP (6% CO 2 , 1.5% O 2 ) at 1.5 °C. The steady state oxygen consumption, carbon dioxide production and ethylene biosynthesis were 8.8 ml kg −1 h −1 , 9.0 ml kg −1 h −1 and 0.04 μl kg −1 h −1 , respectively. These measurements agree with published and measured values.

Journal

Postharvest Biology and TechnologyElsevier

Published: Jun 1, 1995

References

  • Design of modified atmosphere packaging systems: modelling oxygen concentrations within sealed packages of tomato fruits
    Cameron, A.C.; Boylan-Pett, W.; Lee, J.
  • Computer analysis of the variables affecting respiration and quality in polymeric films
    Henig, Y.S.; Gilbert, S.G.

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