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monoxide or dioxide forms. while antimicrobial agents are added to
A method used for the quantification of make more nutrients available to the animal
carbonyl compounds in meat and meat and not to the gut bacteria. In recent years,
products is based on the derivatization there has been an increasing concern regard-
of carbonyl protein groups with the 2,4- ing the development of increased bacterial
dinitrophenylhydrazine (DNPH) to form resistance to certain antibiotics due to the
hydrazones, and then the absorbance is mea- abuse of antibiotics consumption (Butaye
sured at 370 nm (Oliver et al. 1987). Another et al. 2001).
method to evaluate protein oxidation is based Most veterinary drugs have been banned
on the conjugated fluorophores resulting in the European Union for use in farm animals
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