Physico-Chemical Characterization of Carrageenan at Different Temperatures, Isolated from Hypnea musciformis from Karachi Coast Pakistan
Abstract:
This study describe the basic tools like viscosity measurements and thermodynamic parameters of the polysaccharide isolated from Hypnea musciformis (red algae) of Karachi Coast (Pakistan) showed characteristics of κ-carrageenan. An IR spectrum showed a fairly sharp band at 1210, 1225 cm-1 corresponding to sulphate ester and is in accordance with the high sulphate content of κ-carrageenan. Viscosity measurements revealed a linear relationship with increase in concentration and decreased with the rise in temperature of aqueous solutions of κ-carrageenan. Thermodynamic parameters were determined by the change in viscosity data as a function of temperature and concentration. The free energy change of activation (ΔGη) increased regularly as the concentration of aqueous κ-carrageenan increased, as well as rises in temperature. Higher values of free energy change of activation, (ΔGη) showed the higher association of κ-carrageenan with water at given temperature. The values of entropy change of activation (ΔSη) of viscous flow also increased with the increase in concentration and temperature of aqueous κ-carrageenan solution. The high negative values of entropy change of activation (ΔSη) showed that the solution of κ-carrageenan was more ordered in initial state than the activated one.
How to cite this article
Syed Junaid Mahmood, Fatima Bi, Noor Taj, Seema ., M. Farhan, M. Shahid, Rafia Azmat and Fahim Uddin, 2007. Physico-Chemical Characterization of Carrageenan at Different Temperatures, Isolated from Hypnea musciformis from Karachi Coast Pakistan. Journal of Applied Sciences, 7: 3506-3511.
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