Janoshik Analytical: The Independent Lab Behind Every QSC COA
Every QSC compound is tested by Janoshik Analytical before it reaches you. This page explains who Janoshik are, what they test for, how to read a Janoshik COA, and why independent third-party testing is the most important quality signal when sourcing research peptides.
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Who Is Janoshik Analytical?
Janoshik Analytical is an independent analytical testing laboratory that specialises in peptide and research compound quality verification. They are widely recognised as the leading independent COA provider in the research peptide industry.
Janoshik detail
Information
Type
Independent third-party analytical laboratory
Specialisation
Research peptide HPLC purity + mass spectrometry identity testing
COA format
Public-facing certificates — verifiable by order number
Industry position
De facto standard for independent peptide quality verification
Conflict of interest
None — Janoshik has no financial stake in supplier results
Testing independence
Results reported as measured — not adjusted for commercial relationships
Why “independent” matters
When a supplier tests their own products (in-house COA), they have a financial incentive to report favourable results. Janoshik tests are initiated by suppliers but results are issued by Janoshik directly — they report what they find. A Janoshik COA showing ≥99% purity means Janoshik measured ≥99% purity, not that the supplier claims ≥99%.
What Janoshik Tests For
Test
Method
What it confirms
HPLC purity %
Reversed-phase HPLC at 214nm (amide bond UV absorbance)
Target compound represents ≥X% of total UV-absorbing material
Molecular weight (MS identity)
ESI-MS or MALDI-TOF mass spectrometry
Observed MW matches theoretical MW within ≤1 Da — confirms correct sequence
Purity by area normalisation
Peak area integration vs total peak area
Standard RP-HPLC purity calculation method
Retention time
Compound-specific RT on C18 column
Secondary identity confirmation — RT matches reference standard
What Janoshik does NOT test (standard COA)
Standard Janoshik COA covers HPLC purity + MS identity. It does not include: endotoxin (LAL), residual solvents (GC), sterility testing, or amino acid analysis. These require additional testing requests. For standard preclinical research, HPLC + MS is the appropriate quality bar.
How to Read a Janoshik COA
COA field
What it means
What to check
Sample name
Compound as submitted by supplier
Should match what you ordered
HPLC purity %
Area normalisation result at 214nm
≥99% is QSC standard; ≥98% is industry minimum
Observed MW
Mass spec result — measured molecular weight
Should match theoretical MW within ≤1 Da
Theoretical MW
Expected MW for the peptide sequence
Reference for MS comparison
Batch/order number
Traceability identifier
Use to verify COA on Janoshik site
Date of analysis
When the test was run
Recent = current batch; old date = prior batch testing
Verifying a Janoshik COA
Janoshik COAs include a batch/order reference that allows verification. If a supplier provides a COA claiming Janoshik testing, the document should include a reference number traceable to Janoshik records. QSC provides batch-specific Janoshik COA with every order.
Some suppliers test a representative sample from a production run. QSC tests every individual batch — meaning if you order two batches of semaglutide in the same month, each has its own independent Janoshik COA with its own HPLC and MS result. This batch-by-batch testing eliminates the risk of receiving an untested batch that passed inspection on a different lot.
Direct supply chain traceability
QSC directly manufactures via Fmoc SPPS in Qingdao, then ships to Janoshik for testing, then fulfils orders. The supply chain is: synthesis → Janoshik testing → your vial. No intermediate distributors who could swap batches.
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Frequently Asked Questions
Who is Janoshik?
Janoshik Analytical is an independent third-party testing laboratory that provides HPLC purity and mass spectrometry identity testing for research peptides. They are the industry-standard independent COA provider — their results are issued independently of the supplier.
How do I verify a Janoshik COA?
Janoshik COAs include a batch/order reference number. This can be used to verify the COA against Janoshik’s records. QSC provides the COA document with each order — the reference number should correspond to the specific batch supplied.
What does ≥99% on a Janoshik COA mean?
It means Janoshik’s RP-HPLC analysis found that ≥99% of UV-absorbing material in the sample is the target compound. Impurity peaks (deletion sequences, oxidation products) represent <1% of total signal. This is the research-grade standard.
Why is Janoshik better than an in-house COA?
An in-house COA is produced by the supplier testing their own product — a clear conflict of interest. Janoshik is an independent lab with no financial relationship to the result. Independent testing eliminates bias and provides a verifiable quality record.
Does every QSC batch have a Janoshik COA?
Yes — every individual batch is tested by Janoshik before fulfilment. Not periodic sampling from production runs — batch-by-batch independent testing.
QSC quality standard
≥99% Purity
HPLC verified every batch
MS Identity
MW confirmed
Janoshik COA
Independent third-party
Direct Manufacture
Fmoc SPPS — Qingdao
5-Region Shipping
USA·EU·UK·CA·AU
USA · EU · UK · Canada · Australia
Research Use Only: All QSC compounds are sold strictly for laboratory research purposes. Not for human use.
