Extraction collagen and Nanocollagen Preparation from Iraqi Catfish Skin Using Chitosan Physicochemical Characterization . Samarra Journal of Pure and Applied Science, [S. l.], v. 7, n. 4, p. 118–126, 2025. DOI: 10.54153/sjpas.2025.v7i4.1137. Disponível em: https://www.sjpas.com/index.php/sjpas/article/view/1137. Acesso em: 28 may. 2026.