{"name":"Peptide Analytical Methods Selection Matrix","description":"A source-linked comparison of common peptide analytical methods, the questions they can answer, typical outputs, supported interpretations, and limitations.","publisher":"C Suite Biologics","canonical_url":"https://csuitebiologics.com/research-peptides/peptide-analytical-methods","last_reviewed":"2026-08-29","method_count":7,"limitations":"Method selection, validation, sample preparation, reference materials, calibration, acceptance criteria, and laboratory context determine what a result can support. The matrix is educational and is not a test protocol or a substitute for laboratory qualification.","methods":[{"method_id":"rp-hplc-uv","method":"Reversed-phase HPLC with UV detection","primary_question":"How does the sample separate into UV-detected chromatographic components under the stated method?","typical_output":"Chromatogram, retention times, integrated peak areas, and area percentages","supports":"A method-specific relative peak profile and chromatographic purity claim when integration rules and conditions are reported","does_not_establish":"Molecular identity, absolute peptide content, sequence, sterility, endotoxin status, or safety","source_label":"Mant et al., HPLC analysis and purification of peptides","source_url":"https://pubmed.ncbi.nlm.nih.gov/18604941/"},{"method_id":"lc-ms","method":"Liquid chromatography–mass spectrometry","primary_question":"Does mass-to-charge evidence associated with a separated component support the expected molecular mass?","typical_output":"Chromatogram, mass spectrum, charge-state envelope, deconvoluted mass, and mass error","supports":"Molecular-mass and component-assignment evidence; quantitation only when a fit-for-purpose quantitative method is used","does_not_establish":"Complete sequence, positional isomer assignment, absolute content, sterility, endotoxin status, or safety by itself","source_label":"van den Broek et al., quantitative peptide analysis by LC-MS","source_url":"https://pubmed.ncbi.nlm.nih.gov/18701357/"},{"method_id":"lc-ms-ms-peptide-mapping","method":"LC-MS/MS or peptide mapping","primary_question":"Do fragment or map features support the expected sequence or structural assignment?","typical_output":"Fragment-ion spectrum, sequence coverage, identified fragments, or a comparative peptide map","supports":"Sequence-level or comparative structural evidence to the extent covered by the reported map and acceptance criteria","does_not_establish":"Unobserved sequence regions, absolute content, every impurity, sterility, endotoxin status, or biological activity","source_label":"FDA/ICH Q6B specifications guidance","source_url":"https://www.fda.gov/regulatory-information/search-fda-guidance-documents/q6b-specifications-test-procedures-and-acceptance-criteria-biotechnologicalbiological-products"},{"method_id":"amino-acid-analysis","method":"Amino-acid analysis","primary_question":"Does measured amino-acid composition or calibrated content agree with the expected material?","typical_output":"Residue composition, molar ratios, concentration, or total peptide/protein content","supports":"Composition evidence and, with suitable calibration and hydrolysis controls, quantitative content","does_not_establish":"Residue order, intact molecular mass, chromatographic purity, sterility, endotoxin status, or safety","source_label":"FDA/ICH Q6B specifications guidance","source_url":"https://www.fda.gov/regulatory-information/search-fda-guidance-documents/q6b-specifications-test-procedures-and-acceptance-criteria-biotechnologicalbiological-products"},{"method_id":"size-exclusion-chromatography","method":"Size-exclusion chromatography","primary_question":"Are size-related species such as monomer, oligomer, aggregate, or fragment resolved under the stated conditions?","typical_output":"Size-based chromatogram and relative peak areas","supports":"A method-specific profile of size-related species within the method's separation range","does_not_establish":"Exact molecular identity, sequence, absolute content, sterility, endotoxin status, or safety","source_label":"Mant et al., HPLC analysis and purification of peptides","source_url":"https://pubmed.ncbi.nlm.nih.gov/18604941/"},{"method_id":"ion-exchange-or-capillary-electrophoresis","method":"Ion-exchange chromatography or capillary electrophoresis","primary_question":"Does the sample contain separable charge-related variants under the stated pH and method conditions?","typical_output":"Charge-variant chromatogram or electropherogram with migration or retention data","supports":"A method-specific charge-heterogeneity profile and comparison with a reference when one is used","does_not_establish":"Exact molecular identity, sequence, absolute content, sterility, endotoxin status, or safety","source_label":"Sharma et al., synthetic peptide characterization by chromatography","source_url":"https://pubmed.ncbi.nlm.nih.gov/35460196/"},{"method_id":"microbiological-tests","method":"Separate microbiological, endotoxin, or sterility tests","primary_question":"Was a defined biological-contamination attribute tested with an applicable method and acceptance criterion?","typical_output":"Method-specific result, units, detection or quantitation limit, acceptance criterion, and disposition","supports":"Only the specific contamination attribute, sample, method, and lot actually tested","does_not_establish":"Peptide identity, chromatographic purity, sequence, content, overall safety, or the status of another lot","source_label":"FDA/ICH Q6B specifications guidance","source_url":"https://www.fda.gov/regulatory-information/search-fda-guidance-documents/q6b-specifications-test-procedures-and-acceptance-criteria-biotechnologicalbiological-products"}]}