“…Phenylalanine (0.2 mmol) or creatinine (0.2 mmol) was mixed with different amounts of acrolein (0, 0.02, 0.04, 0.08, 0.16, 0.2, 0.4 mmol) in 5 mL of distilled water in screw cap-sealed tubes. The mixture was heated at 130 °C for 2 h and further analyzed by semi-preparative HPLC system (Shimadzu) to identify reaction products (new peaks) formed in the model system ( Wang, Tao, Zhu, Fan, Wang, & Zhao, 2021 ). Briefly, separation was performed on a SunFire Prep C18 OBD column (5 μm, 250 mm × 19 mm) eluted with water (solvent A) and acetonitrile (solvent B) with a flow rate of 5 mL/min.…”