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Article << Previous     |     Next >>   Contents Vol 52(5)

The yield of peptides and amino acids following acid hydrolysis of haemoglobin from porcine blood

Carlos Alvarez A, Manuel Rendueles A and Mario Diaz A B

A Department of Chemical Engineering and Environmental Technology, University of Oviedo, Oviedo, Spain.
B Corresponding author. Email: mariodiaz@uniovi.es

Animal Production Science 52(5) 313-320 http://dx.doi.org/10.1071/AN11218
Submitted: 7 October 2011  Accepted: 18 January 2012   Published: 10 May 2012
 
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Abstract

Animal blood is the most important waste product from the meat industry due to the huge volumes produced and its pollutant power. Different methods are currently employed to process this by-product, such as drying, incineration or enzymatic hydrolysis. All these techniques are expensive, do not result in revalorisation or are not applicable at an industrial scale. In this paper, chemical hydrolysis is presented as an alternative to recover and increase the value of purified haemoglobin, the most abundant protein in blood. Non-enzymatic hydrolysis of haemoglobin is a good method for obtaining peptides due to its low cost, ease of control and the large amount of peptides produced, as well as being suitable for industrial applications. This paper presents a study of the use of two acids (sulfuric and hydrochloric) for this purpose under different experimental conditions. From the analysis of the kinetics of the hydrolysis process, four fractions can be defined: unbroken haemoglobin, soluble peptides, non-soluble peptides and free amino acids. A kinetic model was developed to simulate the hydrolysis mechanisms, providing a good fit to the experimental results. Both sulfuric and hydrochloric acid at concentrations of 6 M can hydrolyse the haemoglobin completely, but the average peptide size is lower for sulfuric than for hydrochloric acid.

Additional keywords: animal feed, peptide size, wastes.


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