“…50 Biological formation of traces of propene has been observed in aerobic cultures of many different types of organisms, in particular Rhizopus strains, but the source was not elucidated. 51,52 In other studies, rabbit cytochrome P-450-catalyzed formation of propene from isobutyraldehyde has been demonstrated, with an activity of 98 mmol/min of product per mol of P-450. 53 It is assumed that by mono-oxygenase action, O 2 is activated using NADPH as an electron source.…”