2.4. Measurement Triglyceride (TG) Level of HepG2 Cells

HepG2 cells were seeded in 60 mm dishes. The cells were treated with 1% BSA solutions (C group), the OA working solution (OA group), the OA working solution with RSV (RSV group), and the OA working solution with phenolic acids (phenolic acids group) for 24 h. After these treatments, the cells were collected and then crushed with PBS by using an ultrasonic cell crusher (Scientz, Ningbo, China). Then, the protein concentration of the crushed liquid was measured with the BCA Assay Kit to normalize the number of cells and the TG level in the cells was measured using the TG Assay Kit (Jiancheng, Nanjing, China).