Table 1.

Natural polymers used in organic hybrid hydrogels for medical applications.

Polysaccharides		Polypeptides and Proteins	Polynucleotides and Others
Homopolysaccharides	Heteropolysaccharides
Cellulose and derivatives (carboxymethylcellulose, hydroxyethyl cellulose; hydroxypropylcellulose methylcellulose hydroxypropylmethylcellulose; cellulose acetophphalate) Pullulan and derivatives Gelan Curdlan Scleroglucan schizofillan Starch and derivatives Dextran Dextrins and cyclodextrins Carrageenan (K-, L-λ, etc) and derivatives (sulphates) Glycogen Inulin Guar gum Gum Acacia Pectin	Chitosan and derivatives Chitin Alginic acid and derivatives Hyaluronic acid Chondroitin and derivative sulphates Xanthan gum Heparin Keratan sulphate Dermatan sulphate Pectin Glycosaminoglycans (mucopolysaccharides) Glucan and beta-glucan Glucomanan Laminarin Proteoglycans Agar Gum Arabic Gum tragacanth Arabinixilans Konjac glucomanan Locust bean gum	Gelatin Collagen Albumins (bovine serum albumin, ovalbumin) β-lactoglobulin Elastin Fibrin Fibronectin Resilin Fibrinogen Immunoglobulins Soy Protein Whey protein Silk (silk fibroin and sericin) Lactoferrin Keratin Zein Casein Synthetic proteins (Calmodulin, elastin-like polypeptides, leucine zipper) Prolamins (gluten, gliadin) Protamins and derivatives Polylysines Lysozyme Histones Enzymes Myoglobin Hemoglobin Cytochrome C Proteic hormons Interferon	DNA RNA       Lignin