Research catalog guide
Peptide Identity vs. Purity: A Research Buyer’s Guide
Identity and purity answer different questions. Identity concerns what a material is represented to be; purity concerns the proportion attributed to the principal material under a particular analysis.
Identity is the first question
A clear product name, unambiguous SKU, stated format, and lot-aware receiving record help a laboratory distinguish one catalog item from another. Similar names or packaging are not substitutes for controlled identification.
Purity is a separate measurement
A high stated purity does not independently confirm identity. Likewise, an identity label does not describe the proportion of related substances, residuals, or other components that may be detected by a method.
Keep the records connected
Purchasing and receiving records should preserve the product name, SKU, format, stated purity, order reference, and date. Keeping these fields together reduces ambiguity when inventory is reviewed or experimental records are reconciled.
Apply a two-question review
Before accepting an item into inventory, ask whether its identification fields match the ordered catalog option and whether the stated purity field matches the specification recorded at purchase. A mismatch in either question should be resolved as a receiving issue. Agreement between the two fields improves traceability, but it still does not turn either field into evidence of sterility, activity, or suitability for a specific protocol.
