Figures & data
TABLE 1 UHPLC-MS/MS parameters
FIGURE 1 Slope ratios between matrix-matched and solvent calibration. Compliance interval covering the range between 0.8 and 1.2 for tolerable matrix effect has been plotted. Phenolic compound codes are indicated in .
TABLE 2 Validation parameters of the optimized UHPLC-MS/MS method in lettuce
TABLE 3. Content of phenolic compounds (mg/kg DW) in different varieties of lettuce
FIGURE 2 Concentration of the phenolic compounds (mg/kg DW) in: (a) lettuce (a) and (b) tomato. Three samples for Trocadero and Mini-Romaine Heart, four samples for Iceberg, five samples for Iceberg fresh-cut, and six samples for Romaine and Mini-Romaine were analyzed in lettuce. For tomato, three samples of each variety were analyzed.
FIGURE 3 UHPLC-MS/MS MRM chromatograms for tomato and lettuce containing: (a) Quercetin at 20 mg/kg DW in trocadero lettuce; (b) Luteolin-O-glucoside at 17 mg/kg in mini-romaine lettuce; (c) Quercetin-3-O-rutinoside at 25 mg/kg DW in plum tomato; and (d) Chlorogenic acid at 317 mg/kg DW in Raf tomato.
TABLE 4 Content of phenolic compounds (mg/kg DW) in different varieties of tomato