Kamalesh Prasad
Chemical and Rheological Studies on Seaweed Polysaccharides (PhD Thesis)
Appl. Rheol. 16:1 (2006) 32-34Abstract: The main aim of the work is to study the physicochemical and rheological behaviour of agar gel extracted from a red seaweed Gelidiella acerosa collected from various locations and seasons in southeast coast and west coast of India. The thesis also deals with the rheological studies of agar gels in presence of various additives including surfactants and fatty acids as well as agar and carrageenan based film-forming dispersions. The observed shear viscosity values were correlated with existing rheological models. It was observed from the shear viscosity studies that agar gel become more gel thinning in presence of non ionic surfactants as well as in presence of fatty acids. Oscillation sweep measurements revealed that the agar gel become liquid like in presence of nonionic surfactants and opposite is true in presence of ionic surfactants. The film forming dispersions prepared from agar and plasticizers had inferior rheological behaviour in comparison to k-carrageenan based thin film forming dispersions. All the agar gel samples collected from various locations displayed different rheological behaviours. © 2006 Applied Rheology.
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