Verify a COA (certificate of analysis)
Enter the batch number printed on the box label, or scan the QR code on the box. The number is looked up in the batch register its certificate was issued from, at tjqxgdlab.com, which opens with the number filled in. Before an order, every compound page carries the specification its batches are released against, and the certificate for the batch you receive comes with the shipment. Each batch has its own certificate; another batch of the same line has another.
How the number is built
Form, month of manufacture, product code, batch sequence: L2607-RT30-0002 is lyophilised, made July 2026, RT30, second batch. The same number is on the vial, the carton, the packing list and the certificate, so any of the four can be typed in. More on batch numbers and how to read the certificate.
What the certificate reports
For a peptide line, three results for the batch, each with its method, with the chromatogram and the mass spectrum attached; the limit for each is in the table below. A protein, solution or supply line reports the results its own page lists, above its specification table.
| Line | Method | Limit |
|---|---|---|
| Purity | RP-HPLC, 220 nm, area normalisation | Not less than 98.0 percent |
| Net content | Fill weight per vial, against the label claim | Label claim within 5 percent |
| Identity | Mass spectrometry | Matches the calculated mass |
The rest of the specification
The limits a lyophilised peptide line is supplied to beyond the three above. They are not reported on the certificate; the desk answers for a particular batch on request.
| Line | Method | Limit |
|---|---|---|
| Any single related substance | RP-HPLC | Not more than 1.0 percent |
| Water | Karl Fischer titration | Not more than 8.0 percent |
| Acetate | Ion chromatography | Not more than 15.0 percent, as the acetate salt |
| Residual solvents | GC and ion chromatography | Acetonitrile not more than 410 ppm; TFA not more than 1.0 percent |
| Retest | On the batch record | Within 24 months of manufacture |
Solution lines are specified by appearance and an assay per component instead of water and residual solvents; protein, glycoprotein and preparation lines by the purity method their own page names (size exclusion and SDS-PAGE for most, RP-HPLC for IGF-1 LR3, IGF-DES and Insulin), with endotoxin. Each compound’s page sets out its own specification and which impurities to expect for that molecule.
Reading a result
Purity is an area percentage of the chromatogram, not a weight: a 10 mg vial at 99 percent holds 10 mg of material by weight, water and counter-ion included, and 99 percent of the peak area belongs to the target peptide. Identity is the measured mass matched to the calculated one, within about one unit; a change of under one unit, a deamidation (+0.984) or PT-141 in place of MT-2, sits inside that tolerance; telling those apart takes a high-resolution mass, or HPLC run beside a reference of the other, and the certificate carries neither. What each of the two results is, in full: HPLC and mass spectrometry on a peptide certificate. The retest date is the day the batch is due for re-analysis, not the day it fails.
If a number does not match
A batch number that is not found, or a certificate whose product or strength does not match the vial, is reported to the desk within five business days of delivery with photographs of the carton and the vials, and the batch is not used. It is handled as a wrong shipment at our cost. A certificate forwarded by a third party is worth checking on this page before it is relied on: the record shows what the certificate was issued with, whatever a forwarded PDF says. Every case and how to report it: claims, refunds and returns.
Questions about certificates
How do I get a COA for a peptide?
Every batch has a certificate of analysis, sent with the shipment, and again on request, and any batch number on a vial, carton or packing list can be looked up on this page against the register its certificate was issued from.
Is a batch number the same as a lot number?
Yes. Some suppliers and certificates call it the lot number. Here it is the batch number, printed on the box label or carried by the QR code on the box, as in L2607-RT30-0002, and this page looks it up in the register its certificate was issued from.
Can I see the certificate before I order?
Before an order, every compound page carries the specification its batches are released against, and the desk answers for a particular batch on request; the certificate for the batch you receive comes with the shipment, and its number can be looked up on this page.
How do you read a certificate of analysis for peptides?
Read the identity line first, then purity, then net content; the retest date is on the batch record. Purity is an area percentage of the chromatogram rather than a weight: a 10 mg vial released at 99 percent holds 10 mg of material by weight, and 99 percent of the detected peak area belongs to the peptide. This page’s two tables list the three results the certificate reports and the rest of the specification, with the method for each. Reading a peptide COA line by line goes through the purity and mass lines, what the specification sets for acetate and TFA, and what a purity percentage does and does not measure.
How can you tell if a peptide COA is real?
Check it against the register it was issued from rather than against the PDF. On ours, the batch number is the one on the box, printed on the label or behind its QR code, and the product and strength are those of the box in your hand. Looking the number up shows the record the certificate was issued from, so a certificate edited after issue will not match it.
Can a certificate of analysis be faked?
A PDF can be edited by anyone, so a certificate is only as good as the record behind it. Here every batch number can be looked up in the register its certificate was issued from, and a retained sample of every batch is held for twelve months from dispatch, to be pulled and retested on request.
Who issues the certificate of analysis?
It is issued from the batch register this page looks up, with the batch number and, for each result, the method and the result. We do not write certificates by hand and we do not issue them in a buyer’s name.
What happens if a batch number does not match?
Report it to the desk within five business days of delivery, with photographs of the carton and the vials, and do not use the batch: it is handled as a wrong shipment at our cost (claims and returns). A batch you believe is out of specification is a separate case: the retained sample is tested against the same specification, you are sent the result, and a failed batch is withdrawn and your order replaced or credited.