Fig. 13
From: Processing of collagen based biomaterials and the resulting materials properties
Comparison of microscopic structures of principally different processed materials. Pericardium (a) and skin (d) are decellularized and freeze-dried, for sponge (b) purified skin is minced and freeze-dried, for films convection-dried (e), instead. Catgut (f) consists of purified small intestine (SIS) which is cut in strands, twisted, stabilized by crosslinking, and convection-dried. Gelatine (c) is hydrolyzed collagen of skin or bone which have been convection-dried