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Superatmospheric oxygen condition combined with carbon dioxide levels affect the respiration rate of fresh-cut butter lettuce

Escalona, Victor H, Bert E. Verlinder, Sabine Geysen and Bert M. Nicolai

Program and Abstract. 9th Controlled Atmosphere Research Conference (CA2005). Michigan State University, East Lansing, Michigan, USA. July 5-10, 2005. page6

2005

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Superatmospheric oxygen condition combined with carbon dioxide levels affect the respiration rate of fresh-cut butter lettuce

The effect of different O2 levels from 0 to 100 kPa in combination with 0, 10 and 20 kPa CO2 o­n the respiration metabolism of greenhouse grown fresh-cut butter lettuce was studied. Fresh-cut lettuce was stored during 3-4 days at 1, 5, and 9°C. Fresh-cut lettuce exposed to 20 to 100 kPa O2 combined with 0, 10 and 20 kPa CO2 showed a CO2 production rate of 40 to 60 nmol kg-1 s-1 at 1°C. When lettuce exposed to 2 to 5 kPa O2 in combination with 10 to 20 kPa CO2 showed a significantly increased CO2 production rates. The oxygen concentration (5 to 100 kPa) had a small effect o­n the respiratory activity of fresh-cut lettuce. Moderate CO2 level (10 kPa) could reduce the oxygen consumption rate of fresh-cut lettuce. This effect was clearer at higher temperature. Gas composition with CO2 levels (20 kPa) probably caused a metabolic disorder increasing the respiration rate of fresh-cut butter lettuce. The respiratory quitrent was about 0.7 to 1.0 in O2 concentrations from 20 to 100 kPa at all temperatures.