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. Author manuscript; available in PMC: 2019 Jun 11.
Published in final edited form as: J Chromatogr B Analyt Technol Biomed Life Sci. 2018 Sep 12;1099:34–45. doi: 10.1016/j.jchromb.2018.09.014

Fig. 2.

Fig. 2.

Representative SIM chromatograms of selected phenolic compounds (4-hydroxybenzoic acid (4-HBA) and hippuric acid (HA) obtained under different optimization conditions showing changes in instrument response (arbitrary unit), peak shape and retention time (min). Left column: dilution solvent composition for preparing standard working solutions and for reconstituting phenolic extract; Middle column: acetic acid concentration in aqueous mobile phase; Right column: sheath gas temperature of the QqQ analyzer.