Research Library
Peptide science, explained with rigor
Editorial articles for qualified laboratories—chemistry, handling, analytics, and quality systems. For research and education only.
76 published articles · 4 categories
15 articles
Peptide Chemistry
Structure, synthesis, sequence, purification, and chemical behavior of research peptides.
7 articles
Storage & Handling
Laboratory storage, controlled reconstitution, solution preparation, and stability.
32 articles
Analytical Testing
COA review, HPLC, LC-MS, mass spectrometry, chromatograms, and data interpretation.
22 articles
Quality Assurance
Method validation, microbiological attributes, specifications, and quality systems.
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Analytical Testing
How to Read a Peptide Certificate of AnalysisA field-by-field guide to peptide COAs, including identity, purity, assay, method details, specifications, signatures, and common warning signs.
Analytical Testing
HPLC Peptide Purity Testing ExplainedHow reversed-phase HPLC separates peptide components, how chromatographic purity is calculated, and why method suitability matters.
Peptide Chemistry
The Complete Guide to Peptide ChemistryA technical introduction to peptide structure, amino-acid sequence, peptide bonds, synthesis, purification, stability, and analytical characterization.
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Peptide Chemistry · 24–28 min · Aug 1, 2026
PEGylation of PeptidesA technical guide to PEG conjugation chemistry, site-selective attachment, polymer architecture, analytical characterization, and quality control for PEG-modified peptides.
Analytical Testing · 12 min · Jul 31, 2026
A Strategy for Peptide Sequence ConfirmationHow intact mass, MS/MS, peptide mapping, composition, and orthogonal methods combine to support peptide sequence identity.
Analytical Testing · 10 min · Jul 31, 2026
Accuracy vs. Precision in Peptide TestingWhy closeness to the true value differs from repeatability and how both are evaluated in analytical validation.
Analytical Testing · 11 min · Jul 31, 2026
Adduct Formation in Peptide Mass SpectrometryHow sodium, potassium, solvents, acids, and matrix components create additional peptide mass-spectral signals.
Peptide Chemistry · 13 min · Jul 31, 2026
Advanced Solid-Phase Peptide SynthesisHow difficult sequences, resin aggregation, pseudoproline building blocks, double coupling, and process monitoring improve SPPS outcomes.
Analytical Testing · 11 min · Jul 31, 2026
Amino Acid Analysis for Peptide CharacterizationHow hydrolysis, derivatization, separation, and detection are used to assess amino-acid composition and support peptide content.
Quality Assurance · 12 min · Jul 31, 2026
Analytical Method Transfer Between LaboratoriesHow laboratories demonstrate that a peptide analytical procedure performs comparably after transfer.
Quality Assurance · 13 min · Jul 31, 2026
Analytical Method Validation for Peptide TestingAn introduction to specificity, accuracy, precision, range, robustness, system suitability, and lifecycle control for peptide analytical methods.
Analytical Testing · 11 min · Jul 31, 2026
Analytical Specificity for Peptide MethodsHow a method distinguishes the target peptide from impurities, degradants, excipients, and matrix components.
Quality Assurance · 12 min · Jul 31, 2026
Batch-to-Batch Consistency in Peptide ManufacturingHow specifications, process controls, trend analysis, sampling, and analytical comparability support consistent peptide batches.
Quality Assurance · 10 min · Jul 31, 2026
Chain of Custody for Peptide SamplesHow receipt, labeling, transfer, storage, and disposition records protect sample identity and test credibility.
Analytical Testing · 11 min · Jul 31, 2026
Chromatographic Resolution ExplainedHow resolution describes separation between peptide peaks and how selectivity, efficiency, and retention influence it.
Analytical Testing · 12 min · Jul 31, 2026
Chromatography Fundamentals for Peptide AnalysisA foundational guide to retention, selectivity, efficiency, resolution, mobile phase, and stationary phase behavior in peptide chromatography.
Storage & Handling · 12 min · Jul 31, 2026
Cold-Chain Logistics for Research PeptidesHow packaging qualification, temperature logging, lane risk, and excursion assessment protect temperature-sensitive peptide shipments.
Storage & Handling · 12 min · Jul 31, 2026
Container-Closure Systems for Peptide MaterialsHow vials, stoppers, seals, permeability, extractables, and surface interactions affect peptide stability.
Quality Assurance · 13 min · Jul 31, 2026
Data Integrity in Peptide Testing LaboratoriesHow audit trails, controlled access, raw-data review, and documented processing protect analytical reliability.
Peptide Chemistry · 12 min · Jul 31, 2026
Deamidation and Isomerization in PeptidesHow asparagine and glutamine can undergo deamidation and how aspartate residues can form isoaspartate.
Analytical Testing · 11 min · Jul 31, 2026
Detector Linearity in Peptide AnalysisHow analytical response should relate to concentration and why residuals, weighting, and range matter more than correlation alone.
Peptide Chemistry · 12 min · Jul 31, 2026
Disulfide Bonds in Peptide ChemistryHow cysteine pairing, oxidation, reduction, scrambling, and analytical mapping affect disulfide-containing peptides.
Quality Assurance · 11 min · Jul 31, 2026
Elemental Impurity Testing for Peptide MaterialsHow elemental impurities may enter peptide materials and how ICP-MS or ICP-OES can support risk-based control.
Quality Assurance · 10 min · Jul 31, 2026
Endotoxin Testing vs. Sterility TestingWhy endotoxin and sterility are different quality attributes, how each is tested, and why one result cannot substitute for the other.
Quality Assurance · 12 min · Jul 31, 2026
Environmental Monitoring in Controlled LaboratoriesHow viable, nonviable, surface, and facility data support contamination control in controlled laboratory environments.
Quality Assurance · 12 min · Jul 31, 2026
Forced Degradation Studies for PeptidesHow controlled stress studies reveal degradation pathways and demonstrate stability-indicating analytical methods.
Quality Assurance · 11 min · Jul 31, 2026
Good Laboratory Practice PrinciplesAn educational overview of GLP roles, study plans, raw data, quality assurance, and archival control.
Storage & Handling · 11 min · Jul 31, 2026
How to Assess Temperature ExcursionsA structured approach to evaluating time-temperature events affecting stored or shipped peptide materials.
Analytical Testing · 11 min · Jul 31, 2026
How to Interpret a Peptide HPLC ChromatogramA practical guide to chromatogram axes, retention time, peak area, resolution, integration, system suitability, and common artifacts.
Analytical Testing · 12 min · Jul 31, 2026
How to Investigate an Unknown HPLC PeakAn evidence-based workflow for characterizing new or unexpected peaks in peptide testing.
Analytical Testing · 12 min · Jul 31, 2026
How to Read a Peptide Certificate of AnalysisA field-by-field guide to peptide COAs, including identity, purity, assay, method details, specifications, signatures, and common warning signs.
Storage & Handling · 10 min · Jul 31, 2026
How to Store Lyophilized Research PeptidesA laboratory-focused guide to temperature, moisture, oxygen, light, packaging, and stability documentation for dry peptide materials.
Quality Assurance · 10 min · Jul 31, 2026
How to Verify a Certificate of AnalysisA practical process for confirming COA authenticity, batch linkage, laboratory identity, and report traceability.
Analytical Testing · 14 min · Jul 31, 2026
HPLC Method Development for Peptide AnalysisA structured approach to defining method goals, screening columns, optimizing gradients, and resolving critical peptide impurities.
Analytical Testing · 13 min · Jul 31, 2026
HPLC Peptide Purity Testing ExplainedHow reversed-phase HPLC separates peptide components, how chromatographic purity is calculated, and why method suitability matters.
Peptide Chemistry · 11 min · Jul 31, 2026
Hydrolysis and Peptide-Bond CleavageHow water, pH, sequence, and temperature contribute to peptide-bond and side-chain hydrolysis.
Quality Assurance · 12 min · Jul 31, 2026
Instrument Calibration and Qualification in Peptide TestingHow installation, operational, performance, and routine calibration controls support reliable analytical data.
Quality Assurance · 12 min · Jul 31, 2026
ISO/IEC 17025 and Laboratory CompetenceHow ISO/IEC 17025 addresses impartiality, competence, traceability, validation, and reporting in testing laboratories.
Analytical Testing · 11 min · Jul 31, 2026
Isotopic Distributions in Peptide Mass SpectrometryHow natural isotopes create peptide isotope envelopes and how monoisotopic and average masses differ.
Quality Assurance · 12 min · Jul 31, 2026
Laboratory Audits for Peptide TestingWhat to evaluate when auditing third-party peptide testing laboratories, including scope, methods, records, and data integrity.
Quality Assurance · 11 min · Jul 31, 2026
Laboratory Document ControlHow SOP approval, versioning, training, obsolescence, and record retention prevent uncontrolled laboratory practices.
Analytical Testing · 12 min · Jul 31, 2026
LC-MS vs. MALDI-TOF for Peptide CharacterizationHow LC-MS and MALDI-TOF differ in ionization, workflow, quantitation, impurity profiling, throughput, and peptide identity testing.
Analytical Testing · 12 min · Jul 31, 2026
Limit of Detection and Limit of QuantitationHow LOD and LOQ are established for peptide methods and why visual detection is different from reliable quantitation.
Analytical Testing · 10 min · Jul 31, 2026
Mass Accuracy in Peptide Mass SpectrometryHow calibration, resolution, charge assignment, and processing affect the difference between observed and theoretical peptide mass.
Analytical Testing · 11 min · Jul 31, 2026
Mass Deconvolution in Peptide AnalysisHow software converts multiply charged peptide spectra into neutral-mass results and where processing errors can occur.
Analytical Testing · 12 min · Jul 31, 2026
Mass Spectrometry for Peptide IdentityHow peptide mass spectrometry works, how charge states are interpreted, and what intact mass can and cannot prove.
Quality Assurance · 12 min · Jul 31, 2026
Measurement Uncertainty in Peptide TestingHow uncertainty components influence confidence in assay, impurity, and quantitative peptide results.
Analytical Testing · 12 min · Jul 31, 2026
MS/MS Fragmentation of PeptidesHow peptide ions fragment in tandem mass spectrometry and how product-ion series support sequence interpretation.
Peptide Chemistry · 11 min · Jul 31, 2026
N-Terminal and C-Terminal Peptide ModificationsHow acetylation, amidation, pyroglutamate formation, and terminal chemistry affect mass, charge, and stability.
Quality Assurance · 13 min · Jul 31, 2026
Out-of-Specification and Atypical Laboratory ResultsHow laboratories investigate failing, atypical, and out-of-trend peptide test results without testing into compliance.
Peptide Chemistry · 12 min · Jul 31, 2026
Oxidation Pathways in PeptidesHow oxygen, light, metals, peroxides, and formulation conditions can oxidize susceptible peptide residues.
Analytical Testing · 11 min · Jul 31, 2026
Peak Integration in HPLCHow chromatographic software defines peak boundaries and why controlled integration is essential for credible peptide purity results.
Analytical Testing · 11 min · Jul 31, 2026
Peak Tailing and Fronting in Peptide HPLCWhy chromatographic peaks become asymmetric and how overload, secondary interactions, and system effects alter peptide results.
Peptide Chemistry · 12 min · Jul 31, 2026
Peptide Aggregation and Self-AssociationWhy peptides aggregate, how concentration and interfaces contribute, and which analytical methods can detect self-association.
Analytical Testing · 11 min · Jul 31, 2026
Peptide Charge States in Electrospray Mass SpectrometryWhy peptides form multiple charged ions and how charge-state assignment supports deconvolution and mass confirmation.
Peptide Chemistry · 12 min · Jul 31, 2026
Peptide Counterions and Salt FormsWhy acetate, trifluoroacetate, chloride, and other counterions matter for mass, solubility, pH, and analytical interpretation.
Peptide Chemistry · 13 min · Jul 31, 2026
Peptide Coupling ChemistryHow carboxyl activation, coupling reagents, bases, and reaction conditions influence peptide-bond formation and side reactions.
Analytical Testing · 12 min · Jul 31, 2026
Peptide Mapping ExplainedHow enzymatic or chemical digestion and chromatographic analysis create a peptide fingerprint for identity and structural comparison.
Peptide Chemistry · 12 min · Jul 31, 2026
Peptide Solubility FundamentalsHow charge, hydrophobicity, pH, ionic strength, concentration, and temperature influence peptide dissolution.
Storage & Handling · 11 min · Jul 31, 2026
Photostability of Peptide MaterialsHow ultraviolet and visible light can affect peptide structure, packaging, and stability testing.
Quality Assurance · 11 min · Jul 31, 2026
Proficiency Testing and Interlaboratory ComparisonsHow external comparisons evaluate laboratory performance and reveal method or execution differences.
Peptide Chemistry · 12 min · Jul 31, 2026
Protecting Groups in Peptide SynthesisWhy temporary and side-chain protecting groups are required and how orthogonal chemistry prevents uncontrolled reactions.
Quality Assurance · 13 min · Jul 31, 2026
Quality Systems in Peptide ManufacturingHow document control, deviations, CAPA, change control, supplier qualification, and data integrity support peptide quality.
Analytical Testing · 11 min · Jul 31, 2026
Recovery Studies in Peptide AnalysisHow spike-recovery and process-recovery experiments reveal losses from extraction, adsorption, filtration, and matrix effects.
Quality Assurance · 12 min · Jul 31, 2026
Reference Standards in Peptide AnalysisHow peptide reference standards are qualified, assigned, stored, tracked, and used for identity and quantitative testing.
Storage & Handling · 12 min · Jul 31, 2026
Research Peptide Reconstitution: Laboratory Principles and ControlsA research-only overview of diluent compatibility, concentration calculations, aseptic handling, mixing, labeling, and post-reconstitution stability.
Quality Assurance · 11 min · Jul 31, 2026
Residual Solvent Testing in Peptide ManufacturingHow synthesis and purification solvents are controlled using risk-based specifications and gas chromatographic analysis.
Peptide Chemistry · 11 min · Jul 31, 2026
Resin Selection in Solid-Phase Peptide SynthesisHow linker chemistry, loading, swelling, and support properties influence peptide assembly and final C-terminal form.
Analytical Testing · 11 min · Jul 31, 2026
Robustness Testing for Peptide MethodsHow deliberate small method changes identify critical parameters and operating ranges in peptide analysis.
Analytical Testing · 10 min · Jul 31, 2026
Ruggedness and Intermediate PrecisionHow analysts, instruments, days, columns, and laboratories contribute to real-world method variability.
Analytical Testing · 12 min · Jul 31, 2026
Sample Preparation for Peptide AnalysisHow dissolution, dilution, filtration, adsorption, stability, and container selection influence analytical results.
Analytical Testing · 10 min · Jul 31, 2026
Signal-to-Noise in Chromatographic TestingHow baseline noise and analyte signal affect sensitivity, detection limits, and low-level peptide impurity measurements.
Peptide Chemistry · 11 min · Jul 31, 2026
Solid-Phase Peptide Synthesis ExplainedHow resin-based peptide assembly works, why protecting groups are required, and where synthesis-related impurities originate.
Analytical Testing · 12 min · Jul 31, 2026
System Suitability Testing for Peptide MethodsHow system-suitability criteria verify that an HPLC or LC-MS system is ready to generate acceptable peptide data.
Peptide Chemistry · 14 min · Jul 31, 2026
The Complete Guide to Peptide ChemistryA technical introduction to peptide structure, amino-acid sequence, peptide bonds, synthesis, purification, stability, and analytical characterization.
Analytical Testing · 11 min · Jul 31, 2026
UPLC vs. HPLC for Peptide AnalysisA practical comparison of HPLC and UPLC for peptide purity, impurity profiling, transfer, speed, pressure, and method performance.
Analytical Testing · 10 min · Jul 31, 2026
UV Detection in Peptide HPLCHow peptide bonds and aromatic residues absorb ultraviolet light and how wavelength selection affects sensitivity and impurity response.
Storage & Handling · 11 min · Jul 31, 2026
Water Content and Karl Fischer TestingWhy residual moisture matters in lyophilized peptides and how Karl Fischer titration differs from loss on drying.
Quality Assurance · 11 min · Jul 31, 2026
What Makes an Analytical Method Stability-Indicating?How specificity, stress studies, mass balance, impurity resolution, and lifecycle controls establish stability-indicating capability.