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Kinetic Modelling of Colour Degradation in Tomato Puree (Lycopersicon esculentum L.)

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Abstract

The kinetics of colour (measured as Hunter ‘a’ value) degradation in tomato puree (Lycopersicon esculentum L.) has been studied over a temperature range of 50–120 °C (isothermal condition), and also during normal open pan cooking, pressure cooking and cooking in a newly developed and patented fuel-efficient ‘EcoCooker’ (non-isothermal condition). The degradation of colour as measured by Hunter ‘a’ value was found to follow first order kinetics. The temperature dependence of degradation was adequately modelled by Arrhenius equation. A mathematical model has been developed using the isothermal parameters obtained to predict correctly the losses of red colour from the time–temperature data of non-isothermal heating/processing method. The results obtained indicate a colour degradation of similar magnitude in all the three modes of cooking used in the study.

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Abbreviations

C 0 :

Measured Hunter colour value (L, a, b) at time zero (dimensionless)

C t :

Measured Hunter colour value (L, a, b) or a combination of these at time ‘t

t :

Heating time (min)

E a :

Activation energy of the reaction (kJ mol−1)

R :

Universal gas constant (8.3145 J mol−1 K−1)

T :

Absolute temperature (K)

A 0 :

Frequency factor (min−1) is a pre- exponential constant

a :

Hunter ‘a’ value at time t (dimensionless)

a 0 :

Hunter ‘a’ value at time zero time (dimensionless)

k :

Rate constant for colour degradation (min−1)

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Acknowledgments

The authors gratefully acknowledge the financial support provided by Land Research Institute, Mumbai in carrying out this work.

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Correspondence to P. Nisha.

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Nisha, P., Singhal, R.S. & Pandit, A.B. Kinetic Modelling of Colour Degradation in Tomato Puree (Lycopersicon esculentum L.). Food Bioprocess Technol 4, 781–787 (2011). https://doi.org/10.1007/s11947-009-0300-1

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