For an antioxidant to be of interest for inclusion in melt compoundable packaging films, it must provide no colour or odour and must be thermally resistant so that it can withstand conditions encountered during polymer processing. The DPPH inhibition assay,12 with some modifications, is a method typically used for the evaluation of the radical scavenging capacity of active films. Typically, film samples of 30 mg are put in cap vials with 1 ml of methanolic 2,2-diphenyl-1-picrylhydrazyl radical (DPPH) 0.05 g/L stock solution. All samples are shaken and kept without being exposed to light at room temperature for 24 h. The film samples are subsequently removed from the solution and their absorbance measured at 517 nm. To study film ageing, films are typically exposed to artificial light at room temperature for several days before being analysed. The radical scavenging results are usually expressed as percentage inhibition of DPPH, as follows: