Peptide Verification
How Do You Match a COA to the Product Strength and Lot on a Vial?
A practical guide to comparing the product, strength, and lot details on a vial with its certificate of analysis.
Short answer. Read the vial label for product name, strength, lot number and expiry, then find the same product, the same fill amount and the same lot number on the certificate. Strength on a lyophilized vial is a fill claim, so the certificate should state the assayed content or the fill weight the purity applies to. Photograph the label beside the certificate and file both.
What this means for your clinic. Make the label-to-certificate comparison a written step at receiving, done field by field rather than at a glance. Photograph the label beside the certificate the day the box arrives and file the photo with the lot, so the match can be shown later.
What should a complete label carry?
The label is the only document physically attached to the product; certificates can be emailed, swapped or reprinted. So the clinic’s guide to verifying peptides makes the label the anchor and the certificate of analysis the document that must agree with it.
For the match to work, the label needs the product name or code, the strength or fill, the lot number, the expiry or retest date and the storage condition. ICH Q7, sections 9.42 and 9.43, list the same set for material leaving its maker’s control, plus the maker’s name and address and the quantity of contents. Section 11.41 puts the expiry date on both label and certificate.
Many labels also carry a GS1 barcode. In it, each data element is introduced by a numeric application identifier: AI 10 is the batch or lot number and AI 17 the expiration date (GS1 Application Identifiers). A scan should return the lot and expiry the printed text shows.
Which label field matches which certificate field?
Lay the two documents side by side and work down this table, writing each row’s result as yes, no or not stated.
| Label field | Certificate field it must agree with | What counts as agreement |
|---|---|---|
| Product name or code | Name and grade of the product (ICH Q7 11.41) | Same name and same salt form; a code needs the supplier’s code list |
| Strength or fill, such as 10 mg | Assayed content per vial, or the fill weight the purity applies to | States the fill or content it covers; neither stated is a gap to record |
| Lot number | Batch or lot number (ICH Q7 11.41) | Character for character, including letters, hyphens and leading zeros |
| Expiry or retest date | Expiry or retest date (ICH Q7 11.41) | Same date; no date means no match on this row |
| Manufacturer or distributor name | Manufacturer’s or testing lab’s name, address and phone number (ICH Q7 11.43 and 11.44) | The lab on the report is the one the supplier named at qualification |
| GS1 barcode, AI 10 and AI 17 | The printed lot and expiry | The scanned values equal the printed ones |
The lot number row fails most often, in small ways: an O read as a zero, a dropped suffix, a lot one digit off. Read it twice, label to certificate and back.
Why are strength, purity and content three different numbers?
A label that says 10 mg is a fill claim: the maker says it put about that much powder in the vial. Purity, from HPLC, is the share of the peptide-related material that is the intended sequence. Content is the share of the powder’s weight that is peptide at all, once water and counterion are subtracted. A certificate can answer the second without touching the other two.
Wang and colleagues (2012) tested synthetic peptides all above 99% pure by HPLC and found peptide content between 62% and 88% by weight. A 99% purity line says nothing about how much peptide a 10 mg vial holds. What Is Net Peptide Content, and Why Isn’t a 10 mg Vial 10 mg of Peptide? works through the arithmetic.
For the match, the certificate should say what the purity applies to: the assayed content for your fill, or the fill weight it covers. A bulk-lot certificate, issued before the powder was divided into vials, may do neither. It can be genuine and still not confirm the strength on your label; the receiving record should say so.
What are the common mismatch patterns?
Most mismatches are supplier filing errors rather than forgeries, and the pattern tells you which.
Product code instead of name. The label carries a name and the certificate a catalog code, or the reverse; ask the supplier for its code list once and file it.
Salt form. Acetate and trifluoroacetate versions of the same peptide are different products with different content; a certificate for one doesn’t cover the other.
Fill size. One bulk lot is often filled into several vial sizes. The bulk-lot certificate doesn’t say which you received, so a 5 mg fill’s certificate can arrive with a 10 mg vial.
A lot that exists for a different strength. The lot number on the certificate is genuine but belongs to another fill or product in the supplier’s system, so a glance never catches it. What Is a Lot Number, and Why Do Some Vials Have No Batch Number? explains how lot numbers are assigned and why a vial without one can’t be matched.
Whichever pattern it is, the lot stays in quarantine until a matching certificate arrives. What Happens When a Shipped Lot and Its Certificate Don’t Match? covers the hour after you find one.
How do you do the match, step by step?
The worked example is the label photo (EV-02) and the independent lab report (EV-01) for lot IGF1A122925.
Photograph the label flat and in focus, with product line, strength, lot number and expiry legible, before the vial goes into quarantine.
Open the certificate sent for this lot and confirm it names the lot, not just the product; How Can a Clinic Verify the Exact Batch of a Peptide It Receives? explains lot-specific versus stock certificates.
Work down the table above and write each row’s result: match, no match or not stated.
Scan any GS1 barcode and compare the AI 10 and AI 17 values with the printed lot and expiry.
Record the receipt: supplier name, supplier lot number, quantity received, date and your initials. Those are the component-record fields in 21 CFR 211.184(a), which adds the original maker’s name and location when it differs from the supplier. Part 211 binds drug manufacturers; it is cited here as the benchmark a legitimate supplier meets, not as a clinic obligation.
File the label photo beside the certificate in the lot file; the pair is the record.
Any no match or not stated on lot number, product or fill keeps the lot in quarantine, and the discrepancy is written up that day.
How Helios does it
Under the Helios verification standard, step 3, the three-way match, compares the vial label, the COA and the lab’s record on four fields on the day a lot arrives: product, strength, lot number and dates. The record is the receiving record (EV-05) with the label photo (EV-02) attached. Any field that disagrees stops the lot until steps 2 to 5 pass. Helios Consultants LLC describes all seven steps in how Helios verifies every lot. If you want help setting this up in your clinic, book a consultation.
Related questions
How Can a Clinic Verify the Exact Batch of a Peptide It Receives?
What Is Net Peptide Content, and Why Isn’t a 10 mg Vial 10 mg of Peptide?
What Is a Lot Number, and Why Do Some Vials Have No Batch Number?
What Happens When a Shipped Lot and Its Certificate Don’t Match?
Sources
ICH Q7, Good Manufacturing Practice Guide for Active Pharmaceutical Ingredients, sections 9.4 and 11.4. View source
GS1 Application Identifiers. GS1. View source
Wang X, et al. Se Pu. 2012. PMID 22715687. View source
21 CFR 211.184, Component, drug product container, closure, and labeling records. eCFR. View source
Educational content for licensed professionals. Not legal or medical advice. No product is offered for sale on this page.