Phoenix Pharmaceuticals offers reliable custom peptide synthesis to support breakthrough research and drug discovery. With more than 30 years of peptide chemistry experience, our scientists deliver high-purity peptides built to your exact specification — from short sequences for binding assays to longer, modified peptides for advanced therapeutic and mechanistic studies.
Every custom peptide is synthesized in-house at our Burlingame, California facility under strict quality control, and every order includes HPLC and mass-spectrometry analysis as standard.
What We Synthesize
- Standard custom peptides — any sequence, any scale (mg to multi-gram).
- Modified peptides — acetylation, amidation, phosphorylation, succinylation, butyrylation, and specific disulfide bridge cross-linking.
- Cyclic peptides — head-to-tail, side-chain to side-chain, and disulfide-bridged cyclic structures.
- Labeled peptides — biotin, fluorescent dyes (FITC, FAM, Cy3, Cy5, Rhodamine), and stable / radioactive isotopes (see Custom Peptide Labeling).
- Long and complex sequences — including peptides with multiple modifications or difficult-to-synthesize regions.
Standard Quality Control
- HPLC purity analysis on every peptide
- Mass-spectrometry confirmation of molecular weight
- Certificate of Analysis (CoA) with every shipment
- Custom purity levels available — research grade (> 75 %), HPLC grade (> 95 %), and ultra-pure (> 98 %)
Purity Options
We synthesize to the purity level your application requires. Most assay and binding studies use > 95 % HPLC-purified peptides; immunization typically uses > 75 %; in-vivo work and structure studies generally require > 98 %. Our team can recommend the right grade based on your downstream application.
Who Uses This Service
- Academic research labs studying receptor binding, signal transduction, and mechanism of action.
- Pharmaceutical and biotech companies developing peptide-based therapeutics and screening libraries.
- Diagnostic developers producing peptide antigens and assay standards.
- Antibody developers using custom peptide antigens for Custom Antibody Production.
Request a Quote
Tell us about your sequence, scale, purity requirements, and any modifications. Our scientists will respond with a tailored quote within one business day. Contact our team to get started.