Fig. 2. Thiobarbituric acid reacting substances (TBARS) in commercial propofol emulsions on aerobic incubation. One-milliliter samples of emulsion were incubated at 37°C with shaking. Values are means (± SD) of triplicate determinations. Labels are sulfite propofol emulsion expiration date and lot number. EDTA-containing propofol emulsions (expiration date, lot number: 01–03, 3297F; 7–01, 4359B; 11–99, 4787Y) did not yield detectable TBARS on incubation.