Source comparison
Sermorelin Research: Clinical Method Comparison
HPLC-MS Sequence purity, molecular weight, absence of truncated fragments Cannot detect misfolding, aggregation, or structural isomers with identical mass Required baseline. But insufficient alone for full characterization Circular Dichroism (CD) Secondary str
This comparison does not assign a generated winner or score.
- HPLC-MS
- Sequence purity, molecular weight, absence of truncated fragments
- Cannot detect misfolding, aggregation, or structural isomers with identical mass
- Required baseline. But insufficient alone for full characterization
- Circular Dichroism (CD)
- Secondary structure (alpha-helix content), conformational integrity
- Requires specialized equipment, doesn't detect small-scale aggregation
- Essential for bioactivity validation. Confirms receptor-binding conformation
- Dynamic Light Scattering (DLS)
- Aggregation state, particle size distribution, solution homogeneity
- Can't differentiate aggregate composition, sensitive to dust contamination
- Catches degradation HPLC-MS misses. Critical for storage validation
- LAL Endotoxin Assay
- Bacterial endotoxin contamination levels
- Doesn't detect non-endotoxin pyrogens or fungal contamination
- Mandatory for in vivo or cell culture use. Overlooked causes study invalidation
- Amino Acid Analysis (AAA)
- Quantitative amino acid composition, sequence verification
- Destructive method, can't confirm modification state or folding
- Gold standard for sequence confirmation when structural data is ambiguous