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International Journal of Food Science
Volume 2014, Article ID 935129, 6 pages
http://dx.doi.org/10.1155/2014/935129
Research Article

Rheology of Indian Honey: Effect of Temperature and Gamma Radiation

1Food Science and Safety Section, Food Technology Division, Bhabha Atomic Research Centre, Mumbai 400085, India
2Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India

Received 14 July 2014; Accepted 1 October 2014; Published 15 October 2014

Academic Editor: Thierry Thomas-Danguin

Copyright © 2014 Sudhanshu Saxena et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

Abstract

Honey brands commonly available in Indian market were characterized for their rheological and thermal properties. Viscosity of all the honey samples belonging to different commercial brands was found to decrease with increase in temperature (5–40°C) and their sensitivity towards temperature varied significantly as explained by calculating activation energy based on Arrhenius model and ranged from 54.0 to 89.0 kJ/mol. However, shear rate was not found to alter the viscosity of honey indicating their Newtonian character and the shear stress varied linearly with shear rate for all honey samples. Honey is known to contain pathogenic microbial spores and in our earlier study gamma radiation was found to be effective in achieving microbial decontamination of honey. The effect of gamma radiation (5–15 kGy) on rheological properties of honey was assessed, and it was found to remain unchanged upon radiation treatment. The glass transition temperatures () of these honey analyzed by differential scanning calorimetry varied from −44.1 to −54.1°C and remained unchanged upon gamma radiation treatment. The results provide information about some key physical properties of commercial Indian honey. Radiation treatment which is useful for ensuring microbial safety of honey does not alter these properties.