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Kinetic study of sulphuric acid hydrolysis of protein feathers

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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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Acknowledgements

This research was supported financially by the Tunisian Ministry of Higher Education, Scientific Research. We would like to thank Mr. Abdelmajid Dammak for his proofreading and correction of the English of the paper.

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  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

    Sana Ben Hamad Bouhamed & Nabil Kechaou

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  1. Sana Ben Hamad Bouhamed
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  2. Nabil Kechaou
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Correspondence to Sana Ben Hamad Bouhamed.

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Ben Hamad Bouhamed, S., Kechaou, N. Kinetic study of sulphuric acid hydrolysis of protein feathers. Bioprocess Biosyst Eng 40, 715–721 (2017). https://doi.org/10.1007/s00449-017-1737-7

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  • DOI: https://doi.org/10.1007/s00449-017-1737-7

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