Optimization of Collagen Isolation from Carp (Carasobarbus luteus) Scales using Response Surface Methodology

Abstract

The scale, which is separated during the mechanical processing of fish, can be used in the production of collagen products as well as in many other different ways. To obtain high-purity natural collagen, it is necessary to remove non-collagenous proteins and perform demineralization of fish scales. Therefore, the aim of this study is to achieve collagen isolation from common carp (Carasobarbus luteus) scales for the production of collagen products with higher efficiency and quality. The demineralization of the scales was optimized using response surface methodology. Experimentally, approximately 89.92±1.10% of the mineral was removed, which closely matched the value predicted by the model. The protein content of the fish scales was increased from 23.12% to 86.16% after the applied procedures. At the end of all the processes, 20.54% of the protein and 3.56% of hydroxyproline (Hyp) were lost. However, the Hyp concentration in the fish scale samples increased from 23.85 to 56.13 mg/g scale, and the Hyp/pro ratio increased from 4.49% to 6.51%. The effective removal of mineral matter, the increase in the amount of Hyp in fish scales, and the increase in the Hyp/pro ratio demonstrate that the applied procedures successfully separate non-collagenous components and achieve collagen isolation.