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Understanding Your Certificate of Analysis (COA)
Every batch at Crown Peptides UK includes a Certificate of Analysis (COA). This report helps verify the identity, purity, and analytical quality of the material being referenced.
Below is a simple guide explaining what to look for when reviewing a COA.
1. Product Identity
This section confirms the report matches the product batch. Look for:
- Product name
- Batch / Lot number
- CAS number
- Manufacturing date
Why it matters:
The COA should always match the batch associated with the product.
2. Purity Percentage
Purity is one of the most important values on a COA and is commonly measured using HPLC analysis.
| Purity Level | General Research Use |
|---|---|
| ≤80% | Early-stage or non-quantitative research |
| ≥95% | Standard research and analytical applications |
| ≥98% | High-purity analytical and advanced research work |
What to look for:
- Clearly listed purity %
- HPLC listed as the testing method
- PASS result shown
Higher purity generally indicates fewer synthesis impurities or by-products.
A Note on Purity Claims
Real analytical testing naturally produces variation between batches.
Because of this, legitimate peptide testing rarely produces identical purity values across every product and every batch. Small differences occur due to:
- Peptide complexity
- Purification efficiency
- Raw material variation
- Instrument tolerances during HPLC analysis
Consistently seeing every product listed as exactly “99.00% purity” can sometimes be a warning sign that results may be templated, excessively rounded, or not generated from genuine batch-specific testing.
Authentic COAs usually show:
- Slight variation between batches
- Different purity values across compounds
- Realistic decimal ranges such as 98.17%, 99.21%, 97.84%, etc.
- Unique chromatograms and retention profiles
3. Understanding HPLC Chromatograms
HPLC (High Performance Liquid Chromatography) is commonly used to assess peptide purity.
What to look for:
- One dominant main peak
- Minimal secondary peaks
- High peak area percentage
Simple interpretation:
- Large clean peak = cleaner sample
- Multiple significant peaks = more impurities present
4. Mass Spectrometry (MS)
Mass spectrometry confirms the molecular mass of the peptide.
Look for:
- Expected molecular weight
- Observed molecular weight
- PASS confirmation
Why it matters:
This helps verify compound identity beyond purity alone.
5. PASS Results
Most COAs include:
- Specification
- Result
- Status
| Test | Specification | Result | Status |
|---|---|---|---|
| Purity | ≥98% | 99.21% | PASS |
| Molecular Weight | Expected Mass Match | Confirmed | PASS |
| Appearance | White Lyophilised Powder | Complies | PASS |
Quick COA Checklist
✔ Product name matches label
✔ Batch number matches vial
✔ Purity percentage clearly listed
✔ Dominant HPLC peak visible
✔ MS identity confirmation present
✔ PASS status shown
✔ Storage conditions included
VERIFIABLE QUALITY
COA Quick View
Every bottle comes with a certificate of analysis, and a QR code linking directly to the testing report on our website for full transparency and traceability.
Why Choose Crown Peptides UK?
Purity and Quality
We produce research-grade peptides to the highest standards, with every batch carefully tested to ensure consistency and purity you can rely on.
Secure and Discreet Delivery
All products are securely packed in high-quality packaging, with extra protective materials to ensure your order arrives safely and discreetly.
Certificate of Analysis
Every bottle comes with a certificate of analysis, and a QR code linking directly to the testing report on our website for full transparency and traceability.
