
Keywords: HPLC-DAD; PG; propyl gallate; BHA; butylated hydroxyanisole; BHT; butylated hydroxytoluene; TBHQ; tertiary butylhydroquinone; XPS; X-ray photoelectron spectroscopy; FT-IR; Fourier transform infrared spectroscopy; HPLC; high performance liquid chromatography; HPLCâ