Fig. 4From: Simultaneous untargeted and targeted metabolomics profiling of underivatized primary metabolites in sulfur-deficient barley by ultra-high performance liquid chromatography-quadrupole/time-of-flight mass spectrometrySeparated isomers, amino acids isoleucine and leucine using an HSS T3 column and organic acids isocitrate and citrate using a Luna Omega PS columnBack to article page