Overview
A Certificate of Analysis (COA) provides a detailed report of the quality control tests performed on a specific batch of a compound. It is the gold standard for verifying the identity and purity of your reagents.
Researchers must review the COA to ensure the compound aligns with their experimental requirements. Missing or incomplete data on a COA should be a warning sign to verify the source's reliability.
Key Concepts
Assay Purity
Assay purity indicates the percentage of the active compound present in the sample. High-quality research compounds typically require >95-98% purity.
Batch/Lot Number
The lot number allows for traceability. If any experimental anomalies arise, researchers can reference the lot number to check for widespread performance issues.
Testing Methodology
Methods like HPLC, NMR, or MS are listed to show how the chemical was identified. Knowing the method helps confirm if it is appropriate for your specific chemical class.
Storage and Handling
The COA often includes specific storage instructions, such as keeping the compound at -20C or protecting it from light, which are critical for maintaining stability.
Practical Application
Always verify that the batch number on the product label matches the COA provided. Store the COA in your laboratory records as part of your internal quality audit processes.
Disclaimer: All research compounds are for laboratory research use only. They are not intended for human or veterinary use.
Sources
- Guidance for COA Standards, USP, 2020
- Analytical Chemistry Principles, Skoog et al., 2018
- Quality Management in the Lab, J. Smith, 2021