Why do we void the oxidase test after 1 minute?

The oxidase test is designed to detect the presence of cytochrome c oxidase in bacteria, which is an enzyme involved in the electron transport chain. After one minute, if there is no color change, it is typically voided because the reaction is time-sensitive; a positive result indicates the presence of the enzyme, while a negative result is confirmed by the absence of color change. Waiting longer could lead to false positives due to environmental factors or reaction with other components. Thus, one minute is the optimal time to ensure accurate results.