Abstract
The aim of this pilot study is to compare two extraction processes tested in our lab with intention to preserve the biological structure and functions of collagen-based isolate for biomedical purposes during its processing. Collagen type I was isolated from various animal sources from fish, porcine and rat skins. The resulting isolates, along with commercial calf collagens as control, were subsequently characterised and their composition examined by means of several analytical methods such as amino acid analysis, FTIR, SDS-PAGE. Moreover, the moisture, lipid, glycosaminoglycans, hydroxyproline and N contents were determined. We found that both the factors considered, the source of the collagen and the process employed, exerted effects on the final composition of the isolate and we monitored the key differences, in particular, with respect to the protein and lipid contents. Moreover, the study provides a discussion of issues surrounding the assessment of the actual pure collagen content determined on the basis of the content of hydroxyproline and the purity of the protein fraction.
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