*3.6. UPLC Analysis*

The phenolic compounds were analyzed using a ultra-high performance liquid chromatography (UPLC) system (CBM-20A, Shimadzu) with two gradient pump systems (LC-30AD, Shimadzu), a UV-detector (SPD-M30A, Shimadzu), an auto sample injector (SIL-30AC, Shimadzu), and a column oven (CTO-30A, Shimadzu). Separation was achieved on an XR-ODS column (3.0 × 100 mm, 1.8 μm, Shimadzu) using a linear gradient elution program with a mobile phase containing solvent A (0.1%, *<sup>v</sup>*/*<sup>v</sup>*, trifluoroacetic acid in distilled deionized water) and solvent B (0.1%, *<sup>v</sup>*/*<sup>v</sup>*, trifluoroacetic acid in acetonitrile). The phenolic compounds were separated using the following gradient: 0–5 min, 10–15% B; 5–10 min, 15–20% B; 10–15 min, 20–30% B; 15–25 min, 30–50% B; 25–30 min, 50–75% B; 30–35 min, 75–100% B; 35–40 min, 100–5% B; and 40–45 min, 5–0% B. The phenolic compounds and anthocyanins were detected at 280 nm and 520 nm, respectively. The chlorogenic acid (CGA), caffeic acid (CA), delphinidin-3-sambubioside (Dp3-Sam), delphinidin-3-glucoside (Dp3-Glu), cyanidin-3-sambubioside (Cy3-Sam), all obtained from Sigma-Aldrich Co. (St. Louis, MO, USA) were identified based on the retention times of commercial standards (UV spectrum). Gallocatechin (GC) and gallic acid (GAL) were identified as described in a previous study [16] and by their UV-visible spectral characteristics.
