Understand the source comparison
SS-LUP-332 Research Peptides: Quality Comparison
HPLC Purity ≥95% (area under curve) ≥98% with impurity profiling ≥98.5% with identified impurity structures Standard grade allows up to 5% unidentified compounds; reference grade identifies all peaks >0.1% Mass Spec Verification Molecular ion only (M+H) MS/MS
No winner is assigned.
This page preserves a source comparison for education. It does not add a rating, recommendation or clinical judgment.
- HPLC Purity
- ≥95% (area under curve)
- ≥98% with impurity profiling
- ≥98.5% with identified impurity structures
- Standard grade allows up to 5% unidentified compounds; reference grade identifies all peaks >0.1%
- Mass Spec Verification
- Molecular ion only (M+H)
- MS/MS fragmentation for sequence
- Full MS/MS with fragmentation map provided
- Without fragmentation, you can't confirm sequence accuracy. Only molecular weight
- Coupling Chemistry
- Not specified in COA
- DIC/HOBt or HATU-mediated
- DIC/HOBt with Kaiser test verification at each step
- Cheaper coupling methods produce inactive des-amino analogs that mass as correct but don't bind
- Storage Specification
- −20°C (generic freezer)
- −20°C with desiccant, dark glass vial, argon backfill
- −20°C, desiccated, argon atmosphere, sealed under inert gas
- Oxidation at the lupeol scaffold occurs even at −20°C without inert atmosphere. Reduces activity 15–30% over 6 months
- Reconstitution Guidance
- 'Dissolve in sterile water'
- Solvent specified with pH buffer recommendation
- Bacteriostatic water pH 6.5–7.0, specific reconstitution protocol provided
- Peptide solubility and stability are pH-dependent; generic water without pH control causes aggregation in 40% of batches