Fig. 2From: Development and validation of a headspace GC-MS method to evaluate the interconversion of impurities and the product quality of liquid hand sanitizersAcetal unstable at pH < 5 during kinetic study*. *Acetal response is depicted in green at 0 h and 6 h. At pH 5 and pH 3, acetal response decreases rapidly and the formation of acetaldehyde (orange) and ethanol (blue) is observed. Acetal is stable in buffers at pH 6.6–8.5Back to article page