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casings, collagen, dispersions, films, mechanical properties


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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