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Modeling the Effect of Time and Temperature on Respiration Rate of Pomegranate Arils (cv. ``Acco'' and ``Herskawitz'')

Authors

  • Oluwafemi J. Caleb,

    1. Authors Caleb and Opara are with Postharvest Technology Research Laboratory, Dept. of Horticultural Science, Faculty of AgricSciences, Stellenbosch Univ., Private Bag X1, Stellenbosch 7602, South Africa. Authors Caleb, Opara, and Witthuhn are with Dept. of Food Science, Faculty of AgricSciences, Stellenbosch Univ., Private Bag X1, Stellenbosch 7602, South Africa. Author Mahajan is with Dept. of Process and Chemical Engineering, Univ. College Cork, Ireland. Direct inquiries to author Opara (E-mail: opara@sun.ac.za).
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  • Pramod V. Mahajan,

    1. Authors Caleb and Opara are with Postharvest Technology Research Laboratory, Dept. of Horticultural Science, Faculty of AgricSciences, Stellenbosch Univ., Private Bag X1, Stellenbosch 7602, South Africa. Authors Caleb, Opara, and Witthuhn are with Dept. of Food Science, Faculty of AgricSciences, Stellenbosch Univ., Private Bag X1, Stellenbosch 7602, South Africa. Author Mahajan is with Dept. of Process and Chemical Engineering, Univ. College Cork, Ireland. Direct inquiries to author Opara (E-mail: opara@sun.ac.za).
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  • Umezuruike Linus Opara,

    1. Authors Caleb and Opara are with Postharvest Technology Research Laboratory, Dept. of Horticultural Science, Faculty of AgricSciences, Stellenbosch Univ., Private Bag X1, Stellenbosch 7602, South Africa. Authors Caleb, Opara, and Witthuhn are with Dept. of Food Science, Faculty of AgricSciences, Stellenbosch Univ., Private Bag X1, Stellenbosch 7602, South Africa. Author Mahajan is with Dept. of Process and Chemical Engineering, Univ. College Cork, Ireland. Direct inquiries to author Opara (E-mail: opara@sun.ac.za).
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  • Corli R. Witthuhn

    1. Authors Caleb and Opara are with Postharvest Technology Research Laboratory, Dept. of Horticultural Science, Faculty of AgricSciences, Stellenbosch Univ., Private Bag X1, Stellenbosch 7602, South Africa. Authors Caleb, Opara, and Witthuhn are with Dept. of Food Science, Faculty of AgricSciences, Stellenbosch Univ., Private Bag X1, Stellenbosch 7602, South Africa. Author Mahajan is with Dept. of Process and Chemical Engineering, Univ. College Cork, Ireland. Direct inquiries to author Opara (E-mail: opara@sun.ac.za).
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Abstract

Abstract:  Understanding the effect of time and temperature on the respiration rate (RR) of fresh-cut produce, towards the design of a suitable modified atmosphere packaging (MAP) system, requires an adequate mathematical model for prediction of RR as a function of both time and temperature. This study investigated the effect of temperature (5, 10, and 15 °C) and storage time (1 to 5 d) on the RR (inline image and inline image) of 2 pomegranate cultivars (cv. ``Acco'' and ``Herskawitz'') fresh arils. inline image and inline image were 3 to 4 folds significantly higher with increased temperature from 5 to 15 °C and were within the range of 2.51 to 7.59 mL/kg h and 2.72 to 9.01 mL/kg h, respectively, for both cultivars. At 15 °C inline image increased significantly from 8.4 to 25.96 mL/kg h from day 1 to 5, respectively, while at 5 °C inline image changed from 2.9 to 2.05 mL/kg h from day 1 to 5. Temperature had the greatest influence on RR and the interaction of time and temperature also significantly affected inline image and inline image. The respiratory quotient (RQ) estimated by linear regression was 0.98 at 95% significant level. The dependence of RR on temperature and time was accurately described with a combination of an Arrhenius-type and power equation model for inline image and inline image of fresh pomegranate arils.

Practical application:  Predicting the respiration of fresh and fresh-cut produce is important in designing postharvest handling systems. Mathematical models to predict respiration rates of pomegranate fresh arils have been developed taking into account the effects of storage time and temperature. These models have practical application in designing modified atmosphere packaging to maintain quality and shelf life of pomegranate arils.

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