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Physiochemical properties of alkali treated kappa - carrageenan

Raj, Kushaal and Lata, Roselyn A. and Rohindra, David (2015) Physiochemical properties of alkali treated kappa - carrageenan. UNSPECIFIED.

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    Abstract

    Kappa (k)-carrageenan was extracted from the seaweed Kappaphycus alvarezii, grown in Fiji, using varying concentrations of potassium hydroxide (KOH) solution: 0.1 to 0.5 M. Increasing KOH concentration increased the yield of -carrageenan while the sulfate content, and the viscosity average molar mass decreased. -carrageenan solutions exhibited non-Newtonian fluid behavior. For the different alkali (0.1, 0.2, 0.3 & 0.5 M) treated -carrageenan, the critical gelling concentration was found to be 1.0, 0.8, 0.7 & 0.6 w/v % respectively at ambient temperature within 24 hrs. The activation energy of the viscous flow was found to decrease for the -carrageenan extracted with increasing alkali concentration. Young’s modulus was found to increase for the -carrageenan gels extracted with increasing alkali concentration up to 0. 3 M after which a sharp decline in gel strength was observed. The melting temperature determined from Differential Scanning Calorimetry increased for gels extracted with higher KOH concentration.

    Item Type: Other
    Subjects: Q Science > QD Chemistry
    Divisions: Faculty of Science, Technology and Environment (FSTE) > School of Biological and Chemical Sciences
    Depositing User: Ms Shalni Sanjana
    Date Deposited: 15 Nov 2016 13:00
    Last Modified: 15 Nov 2016 13:00
    URI: http://repository.usp.ac.fj/id/eprint/9451
    UNSPECIFIED

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