Kinetic study of sulphuric acid hydrolysis of protein feathers |
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Authors: | Ben Hamad Bouhamed Sana Kechaou Nabil |
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Institution: | 1.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 ; |
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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 R
2 = 0.99. |
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