CO-EXTRUSION OF COLLAGEN CASINGS. EFFECTS OF PREPARATION, BRINING, AND HEATING ON STRENGTH, RHEOLOGY AND MICROSTRUCTURE

Main Article Content

S. BARBUT
M. IOI
M. MARCONE

Keywords

casings, collagen, dispersions, films, mechanical properties

Abstract

Properties of five collagen preparations were investigated to enhance understanding of in-line co-extrusion casing formation. The first study revealed that 30% NaCl and 5 min brining provided maximum strength. The second study showed 100% difference in tensile strength between preparations; when adjusted to % protein, the difference was smaller but still existed.  Extrusion force and elastic modulus (G’) also varied; appear to be acid dependent. Denaturation temperature of raw dispersions was between 36.7 and 38.9 ?C. Upon salt brining, it substantially increased to 63.3 -65.3 ?C. Polarized light microscopy revealed numerus intact segments of connective tissue fibers and some cellulose fibers.

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