Rheolution's Resources in Life Sciences

Gelatin hydrogels are three-dimensional, water-swollen polymer networks derived from gelatin, a natural polypeptide obtained by partial hydrolysis of collagen. Collagen is one of the most abundant structural proteins in the extracellular matrix of mammalian tissues, and its denaturation yields gelatin with a linear molecular structure rich in Gly–X–Y amino acid sequences, primarily glycine, proline, and hydroxyproline.

Fibrin hydrogels are natural, protein-based biomaterials formed from fibrin, the insoluble polymer generated during blood coagulation. Fibrin originates from fibrinogen, a plasma glycoprotein composed of three paired polypeptide chains that assemble into a fibrous network upon enzymatic activation. In physiological conditions, fibrin formation is triggered by thrombin-mediated cleavage of fibrinogen, exposing polymerization sites that drive spontaneous self-assembly into a hydrated, porous matrix.

Elastin hydrogels are soft, water-swollen polymer networks derived from elastin or its soluble precursors. Elastin is a highly elastic extracellular matrix protein responsible for the resilience and recoil of tissues such as blood vessels, skin, and lungs. Native elastin is extremely insoluble due to extensive crosslinking, so hydrogel systems are typically formed from soluble elastin derivatives, including elastin peptides, α-elastin, or recombinant human tropoelastin—the natural soluble monomer of elastin.

Dextran hydrogels are three-dimensional, water-swollen polymer networks derived from dextran, a naturally occurring polysaccharide composed primarily of α-1,6-linked glucopyranose units with a low degree of α-1,3 branching. Dextran is biosynthesized extracellularly by bacteria such as Leuconostoc, Lactobacillus, and Streptococcus in sucrose-rich environments and is available over a wide range of molecular weights.

A collagen hydrogel is a hydrated, three-dimensional polymer network formed from collagen, the most abundant structural protein in mammalian extracellular matrices. Collagen molecules consist of three polypeptide α-chains arranged in a characteristic triple-helical structure stabilized by hydrogen bonding and specific amino acid motifs rich in glycine, proline, and hydroxyproline.

Cellulose hydrogels are three-dimensional, water-rich polymer networks derived from cellulose, a linear polysaccharide composed of β-(1→4)-linked D-glucose units. Cellulose is the most abundant natural biopolymer and is primarily sourced from plant biomass such as wood and cotton, but it can also be produced by bacteria, algae, fungi, and tunicates. Native cellulose is insoluble in water; therefore, hydrogel formation typically relies on chemical modification, dissolution–regeneration processes, or the use of cellulose derivatives.