Influence of temperature on the respiration rate of minimally processed organic carrots (Daucus Carota L. cv. Brasília)
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Sociedade Brasileira de Ciência e Tecnologia de Alimentos
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The objective of this work was to study the influence of temperature on the respiration rate of minimally processed organic carrots ( Daucus Carota L. cv. Brasília) with and without the application of a gelatin film. The samples were packed in flexible bags and stored at 1, 5 and 10 °C. During the five days of storage, the CO 2 and O 2 concentrations in the headspace of the package were monitored by gas chromatography, and the mathematical model based on enzymatic kinetics was used to estimate the respiration rate of minimally processed organic carrots. The effect of temperature on the respiration rate was evaluated by the Arrhenius equation. The results showed that the O 2 concentration decreased during the storage period and the CO 2 concentration increased. The lowest O 2 concentrations of 2.59 and 2.66% were found for the samples stored at 10 °C with and without the film, respectively. For the CO 2 concentration, the highest concentrations of 16.25 and 16.32% were again found for the temperature of 10 °C with and without the application of the film, respectively. At the temperature of 1 °C, the maximum respiratory rates for the samples without and with the film were 10.82 and 10.44 mL CO 2 .kg -1 /hour, respectively, after 72 hours of storage. The greatest respiratory rate was obtained at 10 °C, the maximum peak being reached after 50 hours. Activation energy values were of 50.59 kJ.mol -1 , for the samples with the film, and 51.88 kJ.mol -1 for the samples without the film.
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