What certificates of analysis contain?

A certificate of analysis functions as the primary compound verification document within peptide procurement. Every field within the certificate carries specific data that procurement teams interpret against study protocol requirements before sourcing decisions are confirmed. research peptides in Canada sourcing frameworks depend on certificates that reflect independent laboratory testing rather than internal supplier assessment, with each data field serving a distinct verification function within the broader compound evaluation process.

Certificates carry compound identification data as the first documented field – name, catalogue reference, and CAS number, each confirming that the document corresponds to the intended compound. Molecular formula and theoretical molecular weight appear alongside identification data, providing the reference values against which mass spectrometry results are cross-referenced during structural identity confirmation.

Purity percentage derived from HPLC analysis appears as a primary data field within every research-grade certificate. This figure represents the proportion of the sample confirmed as the intended compound following chromatographic separation, and it sits as the central quality indicator that procurement teams reference when evaluating compound suitability against study application requirements.

How does identity data read?

Identity confirmation within a certificate of analysis moves through three progressive data layers – each adding structural specificity to the compound profile documented in the preceding field.

• Molecular formula field – Confirms the elemental composition of the compound, providing the chemical basis against which all subsequent structural data is evaluated.
• Theoretical molecular weight – States the calculated mass of the intended peptide sequence, functioning as the reference value for mass spectrometry result interpretation.
• Observed molecular weight – Records the mass spectrometry result for the specific production lot, with alignment between theoretical and observed values confirming structural identity.
• Amino acid sequence field – Documents the full residue arrangement of the peptide chain, confirming sequence accuracy at the compositional level beyond mass confirmation alone.

Purity fields explained

HPLC purity data occupies the most referenced field within a research-grade certificate of analysis. Procurement teams interpret this figure in the context of their specific study application requirements rather than against a universal acceptable threshold, since different applications operate under different purity specifications.

A 95 percent HPLC purity reading indicates that 95 percent of the analysed sample consists of the intended compound, with the remaining 5 percent comprising residual synthesis byproducts or related impurities. Analytical applications demanding higher compound uniformity reference the 98 percent threshold as their procurement baseline, while biochemical assay applications may operate within the 95% to 97% range depending on protocol specifications.

What accreditation fields confirm?

Accreditation data within a certificate of analysis confirms the independence and competence of the laboratory that conducted the testing. These fields distinguish independently verified certificates from internally generated quality documentation.

• Laboratory name and accreditation reference – Identifies the testing facility and its accreditation body, confirming independent testing outside the supplier’s internal quality framework.
• Testing date field – Records when analysis was conducted relative to synthesis date, establishing the timeline between production and quality confirmation.
• Lot number reference – Links the certificate directly to a specific production batch, enabling lot-level traceability across procurement and study cycles.
• Authorised signatory field – Confirms that a qualified laboratory representative reviewed and approved the testing data before certificate release.

Procurement teams that work through each field systematically build a complete compound profile that supports sourcing decisions grounded in verified, independently tested data rather than supplier declarations alone.