Testing & documentation
Evidence, in detail.
A quality record should connect the material, the method, and the measured result. Each part has a different job to do.
01 / Four distinct questions
More than
one number.
- 01Identity
- Is the analyzed material consistent with the expected compound? Mass spectrometry provides molecular-mass evidence to evaluate alongside the stated identity.
- 02Purity
- What proportion of the relevant chromatographic response is attributed to the target? RP-HPLC separates detected components under defined analytical conditions.
- 03Content
- How much peptide was measured in the sample? A content assay is a separate measurement, with its own method and reporting basis.
- 04Other attributes
- Were endotoxin, elemental impurities, residual solvents, or microbial characteristics evaluated? Each requires an appropriate test and a documented result.
02 / Read with context
Purity and content.
Different measurements.
A 99% HPLC result describes the relative chromatographic response under the reported method. It does not mean that 99% of all physical mass in a vial is peptide. Water, counterions, and other components may contribute to total mass without appearing as peptide-related peaks.
Likewise, the nominal amount on a product selector, a measured peptide-content result, and an HPLC percentage are three different pieces of information. Review each on its own terms.
Methods complement one another. A purity result cannot stand in for identity, sterility, or stability testing.
04 / Reading a record
The result needs its context.
A useful report identifies the compound, lot or sample reference, issuing laboratory, report number, and analysis date. For every reported attribute, look for the analytical method, result, units, and any limits or qualifications. An analysis date and a release date describe different events.
Laboratory testing generally concerns a submitted sample associated with a lot. It should not be described as testing every individual vial. Where the laboratory offers a report-verification service, compare the original record with the supplier’s summary.
A passing result means the reported measurement met an applicable acceptance criterion. It does not establish properties that were never assessed. Endotoxin testing is not sterility testing; a single analysis is not a long-term stability study; a COA is not evidence of a clinical outcome.
When the details do not match.
Keep the label and documentation together. If a lot number is missing, an identity is inconsistent, or a method is unclear, the gap needs clarification before the record can be relied upon. A generic certificate for the same compound does not resolve a mismatch.
Every GLPZone lot is analyzed by Nordicstar Analytical Sciences. Each certificate carries a report number and verification key that can be checked at nordicstarlabs.com/verify.
Read a COA, step by step