RP-HPLC Peptide Purification

The workhorse purification mode for synthetic peptides — optimized for selectivity, yield, and documentation (GLP / ISO 13485 aligned, non-GMP)

Reversed-phase chromatography separates peptides primarily by hydrophobicity. We tune selectivity using stationary phase choice, gradient design, temperature, and mobile phase conditions to isolate target peptide from near-neighbor impurities.

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When to use How we optimize Typical workflow Deliverables Related pages

When RP-HPLC is the right choice

Best fit

• Most synthetic peptides (linear or moderately modified)
• Truncations and deletion products
• Hydrophobicity-shifted byproducts
• High-purity fraction isolation at mg–g scale (project dependent)

When to add an orthogonal step

• Co-elution or partial co-elution of near-neighbor impurities
• Highly polar peptides with weak RP retention
• Charge variants that look identical in RP

In these cases, we often pair RP-HPLC with IEX or HILIC.

How we optimize selectivity

Stationary phase

C18/C8 (and other chemistries when needed) to change retention and resolution.

Gradient design

Gradient slope and holds are tuned to separate target from critical impurities.

Temperature & additives

Temperature and mobile phase conditions can materially improve peak shape and separation.

Typical RP-HPLC purification workflow

• Screen: short analytical runs to identify conditions that resolve target vs impurities
• Prep run: scaled purification with fraction tracking and defined collection criteria
• Verify: analytical HPLC + MS identity verification (as scoped)
• Finalize: pool selection, solvent handling notes, and reporting

Deliverables

• Analytical HPLC chromatograms + purity assessment
• Mass spectrometry identity verification (project-appropriate)
• COA + supporting data package

Related TEW's 

• Ion-Exchange (IEX)
• HILIC
• Desalting / SEC
• COA & QC
• Purification Overview