MAP significantly affected off-odours of baby spinach during
storage. MAP of low O2 with CO2 exhibited the lowest overall
quality at the end of storage primarily due to the development
of off-odours, followed by MAP of low O2 alone, which were the
conditions in which baby spinach showed loss of freshness. The
fermentative volatiles, acetaldehyde and ethanol, routinely used as
indicators of stressful MA for a broad range of vegetables, were not
responsible for the off-odours in baby spinach. We observed that
baby spinach exposed to CO2 increasingly accumulatedammonia up to 7 d, but then only slight increases were observed to the
end of storage. The ammonia production of baby spinach stored
without CO2 was very small. Ammonia content was previously
reported as a good indicator of CO2 injury in spinach