Briefly, the addition of extracts (GPI, GPII) did not affect the pH value or the microbial spoilage in raw pork burgers at the 0.06 g/100 g concentration tested in the current research. However, the highest colour stability and the lowest lipid oxidation values were described in burgers containing extract Type I which showed a potent antioxidant effect. It seems that the new extraction procedure [(methanolic extraction þ High-Low Instantaneous Pressure (HLIP))] permits recovery of a high purity extract which does not adversely affect the sensorial quality of the meat system (data not shown). Grape pomace extracts could be a low-cost antioxidant source, but further researches must be lead in this sense to evaluate the optimal concentration to obtain a potent antimicrobial activity without changing the quality attributes of the product.