Research peptides are tools, not finished products. This page explains what we supply, how these molecules are made and analyzed, and how to read the paperwork that comes with them.
A peptide is a short chain of amino acids joined by peptide bonds, generally fewer than fifty, where a protein counts hundreds. That smaller size is exactly what makes them useful in research: the sequence is fully controlled, synthesis is reproducible, and affinity for a given receptor can be studied in isolation.
The compounds in our catalog span several families: metabolic receptor agonists, secretagogues of the somatotropic axis, tissue-repair peptides, neuropeptides and peptide-metal complexes.
Almost all research peptides are produced by solid-phase peptide synthesis (SPPS). The chain is built one amino acid at a time on an insoluble support, each coupling followed by a wash that clears excess reagents. The peptide is then cleaved from its support, purified and lyophilized.
Reverse-phase high-performance liquid chromatography separates the target peptide from truncated sequences and synthesis by-products. This is the step that determines the final purity quoted on the product page.
The purified peptide is frozen and then dried under vacuum. The resulting lyophilized powder is stable for months at -20 °C, whereas an aqueous solution degrades within weeks. That is why our vials ship dry, to be reconstituted in the lab.
A serious certificate of analysis answers two distinct questions, using two distinct techniques.
| Method | Question it answers | Result |
|---|---|---|
| HPLC | What proportion of the sample is the expected compound? | A purity percentage (area of the main peak) |
| Mass spectrometry | Is this actually the molecule claimed? | A confirmed molecular mass |
Both are necessary. High purity without confirmed identity proves nothing: it only tells you a dominant compound is present, not that it is the right one.
On an HPLC chromatogram, the horizontal axis is retention time and the vertical axis is signal intensity. The target peptide appears as a sharp main peak; impurities show up as smaller secondary peaks at other retention times. The quoted purity is the area of the main peak relative to the total area.
A broad or split peak usually signals degradation or a mixture of forms; a narrow, symmetrical peak is the mark of a well-controlled purification.
Lyophilized and protected from light, most peptides keep at -20 °C. Once reconstituted, the solution keeps refrigerated (2–8 °C) and must not be refrozen: freeze-thaw cycles fragment the peptide chain.
The standard solvent is bacteriostatic water, whose 0.9% benzyl alcohol allows multiple withdrawals from the same vial. Pour it slowly down the wall of the vial and never shake: agitation denatures the peptide and foams the solution.
Every product presented on this site is intended for laboratory research use only. These products are not for human or animal consumption, nor for any diagnostic or therapeutic use. Nothing on this page constitutes medical advice.
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