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For laboratory research use only. Not for human or veterinary use.
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Documentation
How material is verified before it is listed, how certificates of analysis are produced, and how to read one.
Four stages between a lot arriving and a size becoming purchasable.
Cryo Labs does not manufacture. We buy finished lots and then pay an independent laboratory to analyse them, rather than relying on the certificate the manufacturer supplies with the shipment. The laboratory is chosen by us, paid by us, and has no stake in the outcome — which is the only thing that makes a purity figure worth reading.
To be unambiguous about the name: Cryo Labs does not operate a laboratory. We are a distributor. Every figure published on this site was produced by a third-party analytical laboratory under contract, on instruments we do not own, by analysts who do not work for us. The certificate on each product page names the laboratory that issued it, and it is reproduced as we received it rather than restated in our own words. At present the certificates on file were issued by Freedom Diagnostics.
The analysis is destructive: vials are consumed by the testing and never sold. A lot that arrives without a certificate we commissioned is not listed, and the database refuses to list it — a size cannot be made purchasable until its certificate and lot number are on file.
01
Each lot is received against its manufacturing documentation. A lot may be listed while its certificate is still with the laboratory — the product page discloses that state rather than hiding it, and the certificate is published the day it comes back.
02
Vials are drawn from the lot and sent to an independent analytical laboratory that we commission and pay. The laboratory has no commercial interest in the result, and no relationship with the manufacturer.
03
The certificate is checked against what arrived: compound, lot number, and stated size. A certificate that does not match its shipment is not published against it.
04
The certificate is published against the specific lot held in stock and linked from the product page. When stock turns over to a new lot, the certificate on the page changes with it — and the previous lot’s certificate stays on file.
The panel we commission covers identity, purity, and net content — what the material is, how much of it is the stated compound, and how much is in the vial.
Determines · Chromatographic purity
Reversed-phase high-performance liquid chromatography separates the sample by hydrophobicity. Purity is reported as the area of the main peak as a percentage of total peak area at the stated wavelength.
Determines · Identity
The observed molecular mass is compared against the theoretical mass for the sequence or formula. A match within instrument tolerance confirms the material is what the label says.
Determines · Water content
Residual water in a lyophilised solid. This matters because a stated net peptide mass is otherwise ambiguous.
Determines · Physical conformity
Visual inspection against the expected form, colour, and dissolution behaviour.
Not in the panel
It does not cover endotoxin, microbial contamination, or elemental impurities. Those are separate determinations we do not currently purchase, and nothing on this site should be read as a claim about them. If that changes, this page changes with it.
A certificate records what a laboratory measured, on a specific lot, on a specific date, using a stated method. It describes the material and nothing else.
It is also a document produced by a party with an interest in the result, which is why the chromatogram and the mass spectrum matter more than the summary figures. The two fields to check first are the lot number, which must match the vial, and the molecular weight, where the theoretical and observed values must agree. The full guide walks through every field against an annotated sample; the glossary defines the terms the certificate uses.
If a certificate and a vial disagree, or a figure looks wrong, contact us with the order number and lot number.