Oxidation of ethyl esters of PUFAs without NMBHA. The last oxidation was made accordingly to the previous one but without the addition of NMBHA. Additionally, during Flash-LC purification two fractions of oxPUFA were collected, i.e., the ones before and after the hypothetical elution of NMHBA. This was done to access to the oxylipins coeluting with NMBHA and lost in the NMBHA oxidation.