Advances in Natural Polymers by Sabu Thomas P. M. Visakh & Aji. P. Mathew

Author:Sabu Thomas, P. M. Visakh & Aji. P. Mathew
Language: eng
Format: epub
Publisher: Springer Berlin Heidelberg, Berlin, Heidelberg

Although alginate hydrogels with versatile properties can be generated through several gel-forming methods, they all involve labor-consuming work in the modification of alginate or the synthesis of an specific cross-linker [54, 55]. A more simple and direct procedure for the synthesis of chemical hydrogels is the Ugi multicomponent condensation reaction on carboxylated polysaccharides [52].

7.3 Properties of Alginates

Alginic acids isolated from different sources can differ in the ratio of mannuronic and guluronic acids (M/G) and in the distribution of the monomers along the polymeric chain. The size and distribution of individual blocks strongly affect the properties of alginic acids and alginates [1].

Its importance manly lies in its hydrocolloid property, e.g., the ability to hydrate in hot or cold water to form viscous solutions, dispersions, or gels. Alginate has been regarded as an excellent polysachaccharide for gel systems because of its unique features such as biocompatibility, biodegradability, immunogenecity, and non-toxicity [56]. Alginates are, in this way, unique in terms of their properties such as emulsifiers, thickeners, stabilizers, gelling and film forming, resulting in several applications for the food and pharmaceutical industries [57].

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