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Using a modified-atmosphere packaging approach to answer some post-harvest questions: factors influencing the lower oxygen limit.

Beaudry, R. M. and Gran, C. D.

Acta Horticulturae Year: 1993 Issue: No. 326 Pages: 203-212 Ref: 16 ref.

1993

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Using a modified-atmosphere packaging approach to answer some post-harvest questions: factors influencing the lower oxygen limit.

Modified atmosphere packaging (MAP) was used to determine cultivar, temperature and CO2 effects on the lower O2 tolerance of various commodities including apple and blueberry (Vaccinium corymbosum) fruits. Apple fruits, cultivars Empire, Red Fuji, Golden Delicious, Ida Red, Jonathan, Law Rome, McIntosh, Northern Spy and Red Delicious, were placed in controlled atmosphere storage (2-6 weeks) at 0 deg C. After removal, fruits were sealed in polyethylene packs and held at 0 deg until steady state O2 and CO2 partial pressures were generated. Effects of O2 partial pressures on O2 uptake, CO2 production and respiratory quotient were then determined. Respiratory data were collected for similarly packaged blueberries which were stored at a temperature range of 0 to 25 deg C. The lower O2 limit for apple fruits was found to be cultivar dependent, ranging from a low of approx. 0.8 kPa for Northern Spy and Law Rome to a high of approx. 1.0 kPa for McIntosh. For blueberry fruits, the lower O2 limit increased with temperature and CO2 partial pressure. Raising the temperature from 0 to 25 deg caused the lower O2 limit to increase from approx. 1.8 to approx. 4 kPa. Raising CO2 levels from 5 to 60 kPa increased the lower O2 limit for blueberry fruits from approx. 4.5 to >16 kPa.