title: Kinetic study of sulphuric acid hydrolysis of protein feathers.
abstract: Poultry feather keratin is the most important by-product from the poultry industry due to its abundance. Different methods have been still applied to process this by-product such as enzymatic hydrolysis which is expensive and inapplicable at the industrial level. This paper presents a study of acid hydrolysis of poultry feathers using different types of acids, sulphuric acid concentration, different temperatures and solid to liquid ratio to obtain a liquid product rich in peptides. The feathers analysis revealed a crude protein content of 88.83%. A maximum peptides production of 676 mg/g was reached using sulphuric acid, 1 molar acid concentration and 50 g/l solid to liquid ratio at a temperature of 90 °C after 300 min. A reaction scheme for protein aggregation and decomposition to polypeptides and amino acids was proposed and a kinetic model for peptides production was developed. The proposed kinetic model proved to be well adapted to the experimental data with R2= 0.99.
authors.affiliation: Groupe de recherche en Génie des Procédés Agroalimentaires, Laboratoire de recherche en Mécanique des Fluides Appliquée - Génie des Procédés - Environnement, Ecole Nationale d'Ingénieurs de Sfax, Université de Sfax, B.P. 1173, 3038, Sfax, Tunisia. sana.benhamad@gmail.com.
authors.forename: Sana
authors.initials: S
authors.lastname: Ben Hamad Bouhamed
authors.affiliation: Groupe de recherche en Génie des Procédés Agroalimentaires, Laboratoire de recherche en Mécanique des Fluides Appliquée - Génie des Procédés - Environnement, Ecole Nationale d'Ingénieurs de Sfax, Université de Sfax, B.P. 1173, 3038, Sfax, Tunisia.
authors.forename: Nabil
authors.initials: N
authors.lastname: Kechaou
mesh_terms: D000818:Animals; D030161:Avian Proteins / Q000737:chemistry*; D005241:Feathers / Q000737:chemistry*; D006868:Hydrolysis; D007700:Kinetics; D010946:Plants, Medicinal; D011200:Poultry; D011492:Protein Hydrolysates / Q000737:chemistry*; D013464:Sulfuric Acids / Q000737:chemistry*
chemical_list: D030161:Avian Proteins; D011492:Protein Hydrolysates; D013464:Sulfuric Acids; C033158:sulfuric acid
keywords: Feathers; Kinetics; Protein; Sulphuric acid hydrolysis