Abstract
The kinetics of colour and carotenoids degradation in jackfruit bulb slices was evaluated during hot air drying at 50, 60 and 70 °C. Visual colour as well as total carotenoids (TC) content was found to be influenced by the drying process. Tri-stimulus colour parameters such as Hunter L and b values decreased and a value increased during drying. The combination of Hunter L × b value was found to represent the colour change adequately. Degradation of TC and visual colour in terms of Hunter L × b value followed first-order reaction kinetics; however, zero-order reaction kinetics was found adequate to describe changes in total colour difference (TCD) and non-enzymatic browning (NEB). Dependence of the rate constant followed the Arrhenius relationship. The process activation energies (E a) for Hunter L × b value, TCD, NEB and TC were 29.96, 27.21, 27.48 and 55.61 kJ/mol, respectively. Higher E a for TC content indicated greater temperature sensitivity as compared with other colour parameters. Relationship of TC content and Hunter L × b value was found to be more consistent through regression analysis with R 2 ≥ 0.979.
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Abbreviations
- A :
-
Absorbance at 420 nm at drying time t
- A o :
-
Initial absorbance at 420 nm
- C :
-
Value of total carotenoids content at drying time t
- C o :
-
Initial value of total carotenoids content
- E a :
-
Activation energy
- H :
-
Value of visual colour in terms of hunter L × b value or total color difference at drying time t
- H o :
-
Initial value of visual colour in terms of hunter L × b value or total color difference
- k :
-
Rate constant (h−1)
- k a :
-
Arrhenius equation constant
- n :
-
Order of the reaction
- NEB:
-
Non-enzymatic browning
- Q :
-
Measured quality parameter (s) (hunter L × b value total colour difference, non-enzymatic browning, total carotenoids content) at drying time t
- Q o :
-
Measured quality parameter at zero time
- R :
-
Universal gas constant (8.314 kJ/mol)
- RMSE:
-
Root mean square error
- T :
-
Drying temperature (K)
- t :
-
Drying time (h)
- TC:
-
Total carotenoids
- TCD:
-
Total colour difference
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Saxena, A., Maity, T., Raju, P.S. et al. Degradation Kinetics of Colour and Total Carotenoids in Jackfruit (Artocarpus heterophyllus) Bulb Slices During Hot Air Drying. Food Bioprocess Technol 5, 672–679 (2012). https://doi.org/10.1007/s11947-010-0409-2
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DOI: https://doi.org/10.1007/s11947-010-0409-2