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Food and Bioprocess Technology

, Volume 5, Issue 2, pp 672–679 | Cite as

Degradation Kinetics of Colour and Total Carotenoids in Jackfruit (Artocarpus heterophyllus) Bulb Slices During Hot Air Drying

  • Alok Saxena
  • Tanushree Maity
  • P. S. Raju
  • A. S. Bawa
Original Paper

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.

Keywords

Jackfruit bulbs Colour Kinetics Degradation Correlation 

Nomenclature

A

Absorbance at 420 nm at drying time t

Ao

Initial absorbance at 420 nm

C

Value of total carotenoids content at drying time t

Co

Initial value of total carotenoids content

Ea

Activation energy

H

Value of visual colour in terms of hunter L × b value or total color difference at drying time t

Ho

Initial value of visual colour in terms of hunter L × b value or total color difference

k

Rate constant (h−1)

ka

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

Qo

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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Copyright information

© Springer Science + Business Media, LLC 2010

Authors and Affiliations

  • Alok Saxena
    • 1
  • Tanushree Maity
    • 1
  • P. S. Raju
    • 1
  • A. S. Bawa
    • 1
  1. 1.Fruits & Vegetables Technology DisciplineDefence Food Research LaboratoryMysoreIndia

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