3.7. Analysis of the Polyphenol-MGO Adducts
RS
Adducts of peppermint polyphenols with MGO were analyzed by UHPLC-ESI-MS using a Thermo Scientific Dionex UltiMate 3000 UHPLC system (Thermo Fisher Scientific; Waltham, MA, USA) incorporated with a Compact ESI-QTOF-MS (Bruker Daltonics; Bremen, Germany), a quaternary pump (LPG-3400D) and an UltiMate 3000 RS autosampler (WPS-3000). The reaction mixtures were separated on a Kinetex C18 column (150 × 2.1 mm, particle size 2.6 μm) (Phenomenex; Torrance, CA, USA) at 40 °C (a temperature-controlled column compartment, TCC-3000). The mobile phases were (