The proposed methodology was applied to standard
solutions, and the quality control parameters obtained were compared with those achieved in spiked
refined olive oil (SROO). Generally, these parameters showed lower values in SROO than in standard
solutions. Matrix effect, recovery and process efficiency have been studied using SROO. The recoveries
were around 90% and the process efficiency of the whole method was higher than 80% for most of the
phenolic compounds studied. Examination of these parameters revealed that work straight in the olive
oil matrix, which is closer to behave as a real sample, provides better results. The applicability and
reliability of this methodology have been confirmed using real samples.