Laboratory Quality
Educational guides to the analytical and logistical standards behind every research-grade peptide.
High-performance liquid chromatography separates peptides on a C18 reverse-phase column under a gradient of acetonitrile and water with trifluoroacetic acid. UV detection at 214 nm captures the peptide bond. Purity is expressed as the percentage area of the main peak — research-grade peptides should be ≥ 98 %.
MS confirms that the molecule synthesised actually matches the intended sequence. Electrospray ionisation generates multiply-charged ions; deconvolution returns the monoisotopic mass. The observed mass must match the theoretical value within ±1 Da.
A COA is a batch-specific record listing identity (MS), purity (HPLC), appearance, water content and any additional release tests. A COA without method, threshold and batch number is incomplete. Always check that the COA matches the physical batch you receive.
Sub-98 % peptide carries truncated sequences, deamidated residues and synthesis by-products. These contaminants distort dose-response data, generate immune artefacts in cell culture and confound any structure–activity conclusions. The cost of poor purity is irreproducible research.
Freeze-drying removes water under vacuum at low temperature, yielding a stable amorphous powder that resists hydrolysis, deamidation and aggregation. Properly lyophilised peptides are stable at –20 °C for years.
Heat exposure accelerates the decomposition pathways peptides are most vulnerable to. SPT ships in insulated packaging and recommends laboratory storage of lyophilised material at –20 °C, protected from light. Reconstituted solutions are far less stable and have shorter usable windows.
Every batch carries a unique identifier linking it to its synthesis records, raw materials, analytical data and release documentation. Traceability lets a research team correlate experimental results with the specific material used and audit any anomaly back to source.
I'm here to help!
Ask me about peptides, receptors, or signalling pathways.
Educational use only. No dosing or medical advice.
For research purposes only — not for human consumption.
