The best peptide purity depends on the application. A screening project, antibody generation study, quantitative receptor assay, and clinical-stage program do not require the same purity target. Choosing an unnecessarily high purity can increase cost and lead time, while choosing purity that is too low can affect the reliability of the experiment.
For early screening, peptide library work, or fast preliminary studies, lower-purity material may be acceptable if the goal is directional data rather than a highly quantitative result.
Antigen design, antibody generation, and non-quantitative ELISA-related workflows often use intermediate purity ranges, depending on the assay sensitivity and purpose.
Receptor binding studies, quantitative enzyme assays, and in vivo work usually require higher-purity peptide to reduce uncertainty from peptide-related impurities.
SAR studies, crystallography, advanced analytical work, and regulated development programs often require the highest practical purity.
| Purity range | Typical use |
|---|---|
| Crude | Fast screening, peptide library screening, rapid exploratory work |
| >75% | Peptide arrays, antigens for antibody production, ELISA titer standards |
| >80% | Non-quantitative western blot studies, blocking studies, phosphorylation assays, affinity purification |
| >95% | Quantitative ELISA/RIA, receptor-ligand interaction studies, in vitro and in vivo bioassays, mass spectrometry, NMR |
| >98% | SAR studies, APIs, clinical studies, crystallography, highly sensitive quantitative work |
Crude peptides may contain not only peptide-related impurities such as deletion or truncated sequences, but also non-peptide components such as residual solvents, cleavage reagents, and counterions. That is why crude material is generally not recommended for demanding biological assays.
If your peptide is long, highly modified, hydrophobic, or intended for quantitative biological work, purity selection becomes more important because impurities may influence both handling and interpretation of the results.
Analyze your sequence to better understand handling and sequence-related difficulty:
If you are unsure which purity level is appropriate for your project, please email sales@lifetein.com or use our quotation form.