agreement with the present results, Utrera et al. (2012) did not found a beneficial effect of the direct addition of tocopherols-rich avocado oil and phenolic-rich extracts against tryptophan oxidation. The depletion of tryptophan and sulfur-containing amino acids during meat processing remains a relevant nutritional loss owing to the multiple biological functions of these essential amino acids (Soladoye et al. 2015).