Fig. 1. Thiobarbituric acid reacting substances (TBARS) in commercial metabisulfite and EDTA-containing propofol emulsions. Assays were performed in triplicate (mean ± SD) from single bottles taken at random from a case of each lot. All assays were performed simultaneously and prior to the expiration of all emulsions except the EDTA propofol emulsion lot 4787Y (11–99).