Christie has demonstrated the potential of such a detector in the analysis of the different lipids classes [ 151. Since we do not have a ternary gradient, it was impossible for us to adapt Christi's work to our own needs. On the other hand, despite the improvement of the elution of acid lipids [ 161 no gain in precision has arisen for the phosphatidic acid. This is why it was necessary to develop our own separation system and quantitative analysis for the "categories" of phospholipids present in our samples.