Hesi 2 electrospray ionization source

Each sample was analyzed using three separate LC-MS/MS methods using two different LC systems (Thermo Scientific ICS-5000+ ion chromatography and Thermo Ultimate 3000). Each was coupled directly to a Q-Exactive HF Hybrid Quadrupole-Orbitrap mass spectrometer with a HESI II electrospray ionization source (Thermo Scientific, San Jose, CA). Full details for each method are provided in the “Supplementary information” section (Supplementary Methods). Briefly, for method 1, anion-exchange chromatography coupled with mass spectrometry (IC-MS/MS) was performed as recently published [31 (link)]. Reversed phase C18 column analysis was performed for both methods 2 and 3. For method 2, the samples were used underivatized (same as in method 1) [31 (link)], while for method 3, samples were derivatized prior to analysis using a modified version of the Waters AccQ-Tag method designed for amino-acid analysis [35 (link)].

A Dionex Ultra High-Performance Liquid Chromatography (UHPLC) system coupled to a Linear Trap Quadrupole (LTQ) Orbitrap Velos mass spectrometer with a HESI-II electrospray ionization source (Thermo Scientific, San Jose, CA, USA) was used for polyphenol identification. LC-High Resolution Mass Spectrometry (LC-HRMS) data were acquired and processed with Xcalibur 2.2 (Thermo Scientific, San Jose, CA, USA).
An Agilent 1100 Series liquid chromatograph (Agilent, Technologies, Palo Alto, CA, USA), coupled to an Applied Biosystems 4000 QTrap hybrid triple quadrupole/linear ion trap mass spectrometer (AB Sciex, Framingham, MA, USA) was used for quantitation purposes. The LC-UV-MS/MS data were acquired and processed with Analyst 1.6.2. (AB Sciex, Framingham, MA, USA).
The spectrometric determination of the antioxidant capacity was performed in an 8453 UV-Vis Spectrophotometer (Agilent, Santa Clara, CA, USA) using QS quartz cuvettes (10 mm optical path) from Hellma Analytics (Jena, Germany).
Additionally, other laboratory equipment comprises a hot plate stirrer with temperature controller (IKA^® RCT basic), a Hettich Rotanta 460 RS centrifuge (Tuttlingen, Germany), a Vibra Mix R Vortex (Ovan, Barcelona, Spain), and an ultrasonic cleaner Branson 5510EMTH (Sigma-Aldrich, St. Louis, MO, USA).