#hydrophilicity

[biology-geology-beaches-india]

The Scientific Research Notes Of S. Sunkavally (years: 2002-2011).

2874-2877.

[oddreythegreat]

I am a hydrophobic amino acid, in the folded protein of humanity, in the solvent of life.

[green-materials]

Reactive Graft Copolymers of Cellulose and Chitosan with Functional Ligands for Use as ‘Globe-Compatible Materials’ in the Field of Analytical, Environmental and Biomedical Applications

Natural materials available in large quantities from agricultural residues are suitable for the removal and recovery of various organic and inorganic moieties from aqueous solutions because of their low cost, biodegradability, presence of different functional groups, sludge form and availability. Cellulose is one among them, which has numerous applications for the removal of heavy metals, recovery of proteins and potential drug delivery vehicles. In the present work, cellulose was extracted from agricultural residues and surface modifications such as grafting and cross-linking followed were carried out to increase its hydrophilicity, elasticity, water sorbency, adsorption or ion exchange capability and thermal resistance. Grafted celluloses were functionalized and were used as the adsorbent/ion exchange materials for the removal and recovery of various organic and inorganic moieties from aqueous solutions in the field of separation science attention due to their high strength and stiffness combined with low weight, high surface area, unique mechanical properties, biodegradability, hydrophilicity, and renewability. Nanocellulose based novel hydrogels were also prepared by graft copolymerization technique and used for the selective separation of proteins from aqueous solutions. nanocomposites with interpenetrating polymer net works bearing different functional moieties  were also fabricated for the selective separation proteins for biomedical applications.Chitosan is a linear polysaccharide obtained by extensive deacetylation of chitin, which is the most abundant polysaccharide in nature after cellulose. Despite its all advantages including high mechanical strength, hydrophilicity, good adhesion, nontoxicity, biodegradability, and biocompatibility, chitosan lacks good solubility at physiological pH so that it is unsuitable for ionic absorption in neutral and physiological environments. Hydrophilic properties of the chitosan have been improved by different modifications. Novel pH sensitive composite bydrogels were prepared by in-situ intercalation olymerization between hydrophilic monomers, containing both nonionic and anionic groups, and chitosan derivatives intercalated clays, and were well characterized and used as pH responsive drug delivery systems.and water treatment applications. Nanocellulose have gained increasing Polymer-grafted-cellulose/clay.

T. S. Anirudhan

Department of Chemistry, University of Kerala, Kariavattom,

Trivandrum 695 581