What a chromatogram shows
In reversed-phase HPLC of a synthetic peptide, the sample is separated on a column and a detector records absorbance as species elute. The resulting chromatogram plots detector response against time.
The main peak is attributed to the intended peptide under the method conditions used. Smaller peaks may represent deletion sequences, truncations, oxidation products or other process-related impurities.
Chromatographic purity is usually the area of the main peak expressed as a percentage of total integrated peak area at a stated wavelength.
Method details that change interpretation
Detection wavelength matters. Absorbance near 214 nm responds broadly to peptide bonds, while 280 nm responds primarily to aromatic residues. An impurity invisible at 280 nm can still be significant at 214 nm.
Gradient conditions, column chemistry, ion-pairing reagent and integration parameters all influence which species are resolved and how area is assigned. A purity figure without method context is incomplete.
Peptide Tactics treats HPLC chromatograms as part of batch documentation supplied with orders, so researchers can review the chromatographic evidence behind the reported purity.
What a chromatogram does not prove
A single dominant peak does not by itself prove molecular identity. Identity confirmation typically requires mass spectrometry or another orthogonal method.
Nor does a chromatogram establish sterility, endotoxin status or heavy-metal content. Those are separate analytical questions with separate documentation.
Finally, a chromatogram describes the batch analysed. It does not transfer automatically to a different lot.
Frequently asked questions
Are HPLC chromatograms available from Peptide Tactics?
Yes. HPLC purity analysis and supporting chromatograms form part of the batch documentation supplied with orders.
Does a clean chromatogram confirm peptide identity?
No. Chromatographic purity and identity confirmation are distinct checks. Identity is typically supported by mass spectrometry, kept separate from HPLC purity.
Sources and further reference
Compounds this applies to
The considerations above are not abstract. Each of these compounds is listed in the Peptide Tactics catalog for research use in India, with its reference data, analytical notes and documentation status set out in full.
BPC-157
BPC-157 is a synthetic pentadecapeptide — a chain of fifteen amino acids — corresponding to a partial sequence of the gastric juice peptide BPC (Sikiric et al., Life Sciences, 1994; PMID 7904712). It is listed here as a research catalog item with the compound reference data recorded in public chemical databases.
View listing and pricingMOTS-c
MOTS-c is a 16-residue mitochondrial-derived peptide. It is unusual among the peptides in this catalog because it is encoded within the mitochondrial genome rather than the nuclear genome, in an alternative open reading frame inside the 12S ribosomal RNA gene.
View listing and pricingRetatrutide
Retatrutide (development code LY3437943; Coskun et al., Cell Metabolism, 2022, PMID 35985340) is an investigational peptide in clinical development. Which molecular mass applies depends on the chemical form described: PubChem's parent-peptide record (CID 171390338) is titled "Triple G"; Retatrutide, LY3437943 and CAS 2381089-83-2 appear there as Removed Synonyms rather than current depositor-supplied synonyms, while the record titled "Retatrutide (sodium salt)" is CID 171934787.
View listing and pricingSee the full research peptide catalog, the India sourcing guide or batch documentation and analytical reports.
Continue reading
- HPLC analysis of peptides — How reversed-phase HPLC separates peptides, which method parameters change the reported purity, and how to read a peptide chromatogram critically.
- Peptide purity explained — What a peptide purity percentage actually measures, why it differs from net peptide content, and which method details make a purity claim readable.
- Understanding peptide certificates of analysis — How to read a peptide certificate of analysis: which fields carry real information, how to spot a template, and what a COA cannot tell you.