USP General Chapters

USP <1228> - Depyrogenation

Plain-language explanation, inspection context and common violation patterns.

What it says

This general information chapter describes methods for removing or inactivating pyrogens and endotoxins from materials, containers and equipment, such as dry heat, and the approach to validating those processes, including the use of endotoxin challenge indicators to show a defined log reduction.

Paraphrased for plain-language clarity. Always verify against the current published regulation text.

What it means in practice

Depyrogenation matters wherever the product will be injected and glassware, stoppers or equipment could contribute endotoxin.
A validated depyrogenation cycle is demonstrated by challenge studies, not assumed from temperature and time alone.
It complements endotoxin testing, which detects problems, while depyrogenation prevents them.

What inspectors look for

Whether depyrogenation cycles were validated with endotoxin challenge and the results support the defined cycle.
Whether routine operation stays within the validated parameters.
Whether changes to load patterns or equipment led to revalidation.

Most common violation

A depyrogenation cycle used routinely without challenge-based validation, or with loads that differ from the validated configuration.

Related regulations

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