HPLC Purity Analysis and Quality Control Standards for SS-31 Research Peptides
Research Notice: This article covers research on SS-31 research peptide and MOTS-C research peptide — available from Palmetto Peptides for laboratory use only.
Research Disclaimer: SS-31 is sold by Palmetto Peptides strictly as a research compound for in vitro and laboratory use only.
Every SS-31 experiment depends on one foundational assumption: the compound used was actually SS-31 at the stated purity. Researchers can review lot-specific COA documentation and order SS-31 research peptide from Palmetto Peptides — every batch tested to >= 98% HPLC purity with full chromatogram and MS identity confirmation. See also: BPC-157 quality standards and NAD+ peptide quality research.
How Reverse-Phase HPLC Works for Peptide Purity
RP-HPLC separates compounds on a C18 column by hydrophobicity. For SS-31: detection at 214 nm (peptide bond) or 280 nm (aromatic residues). Purity % = (SS-31 peak area / total UV-absorbing peak area) x 100.
What HPLC Detects vs Does Not Detect
| Detects | Does NOT Detect |
|---|---|
| Truncated sequences and impurities | Residual organic solvents |
| Oxidized SS-31 variants | TFA counterion content |
| Racemization products | Residual water |
| Synthetic byproducts | Endotoxins |
Purity Thresholds for Research Applications
| HPLC Purity | Research Suitability |
|---|---|
| Below 90% | Not appropriate for rigorous in vitro research |
| 90-94% | Exploratory or pilot use only |
| 95% or above | Standard research grade acceptable for most cell-based assays |
| 98% or above | High purity recommended for quantitative or publication-quality work |
What a Complete COA Should Include for SS-31
- Lot-specific HPLC chromatogram (not just a number)
- HPLC purity percentage and integration table
- Mass spectrometry identity confirmation with observed m/z values
- Peptide content percentage (accounts for TFA and water)
- Lot number, net weight, synthesis date, storage conditions
Purity vs Peptide Content: An Important Distinction
Purity measures target peptide vs impurities. Content measures actual peptide mass vs total material weight including counterions and water. Both values are needed for accurate dosing. See also: MOTS-C quality standards, longevity peptide sourcing research, cellular health research.
Frequently Asked Questions
What purity level should SS-31 have?
At least 95% for most in vitro work; 98% or above for quantitative, binding, or publication-quality research.
What is the difference between peptide purity and peptide content?
Purity is target peptide vs impurities by HPLC. Content is actual peptide mass vs total vial weight including water, TFA, and counterions.
What MS technique verifies SS-31 identity?
ESI-MS or MALDI-TOF confirming MW approximately 639.80 g/mol. ESI-MS detects [M+2H]2+ at approximately m/z 320.9 and [M+3H]3+ at approximately m/z 214.3.
See Also: SS-31 Research Peptide: Complete Guide