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Orientador(es)
Resumo(s)
The design of modified atmosphere packaging (MAP) for fresh-cut produce requires an adequate model for prediction of respiration
rate as a function of both temperature and gas composition. In this work, the O2 consumption and CO2 production rates of
shredded Galega kale were studied. The storage temperatures used were 1, 5, 10, 15 and 20 C. The atmospheres tested were all
combinations of 1, 5 and 10% v/v O2 plus 0, 10 and 20% v/v CO2 with the balance being N2, as well as ambient air. Temperature was
the variable with the greatest influence on respiration rate and the effect of gas composition increased with temperature. The dependence
of respiration rate on gas composition was well described by a Michaelis–Menten type equation with uncompetitive CO2
inhibition. The respiratory quotient (RQ) was found to be constant for the range of temperatures and gas compositions tested and
was equal to 0:93 0:01. The constants of the Michaelis–Menten equation increased exponentially with temperature. The change
over time of respiration rate of leaves exposed to air at 20 C was also analysed. It was observed that respiration rate decreased with
time and that the ratio between the respiration rate of shredded and intact leaves was approximately constant in the period tested
and equal to 2.8. 2002 Elsevier Science Ltd. All rights reserved.
Descrição
Palavras-chave
Fresh-cut produce Gas composition effect Respiratory quotient (RQ); Respiratory response to wounding Temperature effect
Contexto Educativo
Citação
FONSECA, Susana C....[et al] - Galega kale for development of modified atmosphere packaging. Journal of Food Engineering. ISSN 0260-8774/02. Vol. 54 (2002), p. 299–307
Editora
Elsevier