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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The authors gratefully acknowledge the financial support provided by Land Research Institute, Mumbai in carrying out this work.
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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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DOI: https://doi.org/10.1007/s11947-009-0300-1