Choose the stage of oxidation
Peroxide value measures primary oxidation products. Other endpoints, such as p-anisidine or a defined volatile marker, address different parts of the change. One number does not describe the entire oxidation history.
Describe the product
Include the oil or fat type, finished food, package, storage and observed change. A bulk oil and a complex packaged food can need different preparation and interpretation.
Use time-point context
For stability work, keep the endpoint and sample basis consistent across pulls. Baseline and storage history help distinguish initial condition from change during the study.
Interpret with the product
Review chemical findings with agreed quality observations and criteria. The appropriate endpoint is selected for the product and study rather than added as an undefined rancidity panel.
Related testing & guidance
Technical & service references
Vanguard service detailsSource review: November 8, 2026. The agreed method and project scope govern the testing.