PE-22-28 8mg Vial

Description

The PE-22-28 8mg vial is supplied as a seven residue spadin derivative, freeze dried and sealed. The fill weight is 8 mg of net peptide content. The cake is white to off-white. Every figure quoted on this page comes from the certificate issued against the lot number on the vial. For laboratory research use, and not for human or veterinary consumption.

Eight milligrams is an unusual fill weight for this shelf, which makes the per milligram arithmetic the only way to place it against the rest. The label on the PE-22-28 8mg vial carries the compound, the fill weight and the lot number, and that is the extent of it.

Contents of the PE-22-28 8mg vial

Everything that can honestly be said about the PE-22-28 8mg vial before the certificate is opened is listed below.

The format, the fill weight and the milligram arithmetic

Lyophilized means the material was frozen and then dried under reduced pressure, so the ice sublimed straight to vapour. Heat drying would damage the sequence, and a liquid product would arrive degraded. The finished cake is porous and light. It can look like a wafer, a crust, or almost nothing at all in a small fill, and that variation is normal rather than a defect. Nothing about the PE-22-28 8mg vial is sold by volume.

How the per milligram figure is worked out

Milligram content is the unit the PE-22-28 8mg vial is sold in, because it is the only figure that makes two listings comparable. Run the division and the result is about $11.12 per milligram. Purity belongs in that calculation too, at least loosely, since a lot assaying lower is delivering fewer milligrams of the target sequence for the same money. The certificate figure is on the page, so the adjustment is available. Compare the PE-22-28 8mg vial on that basis rather than on the price of the glass. The case is made at greater length in why price per milligram beats the price on the bottle.

The documentation that comes with the PE-22-28 8mg vial

Read the certificate from the top and check the identifiers before the numbers. Lot number first, matched against the vial. Date of analysis next, because an old date on a new lot is a sign the document has been recycled. Then purity, then the mass spectrometry comparison, then water content, then the signature and the name of the laboratory. A sheet missing the lot number is not a certificate, it is a leaflet. The certificate issued with the PE-22-28 8mg vial is specific to the lot and not to the product line.

The laboratory that runs the assay has no ownership connection to this company. That arrangement is not a seal of approval and it does not make the figures infallible, but it does remove the obvious conflict of interest in a vendor grading its own stock. Stock is withdrawn from sale where the certificate for the PE-22-28 8mg vial does not support the figures here. See how to read a certificate of analysis and why we publish the batch that failed.

Purity, identity and moisture are three different measurements

The purity line on the certificate is an HPLC result. Chromatography separates whatever is in the vial into peaks, and the percentage is the main peak measured against all of them. Impurities in a synthetic peptide are mostly shortened versions of the intended sequence, plus traces of the reagents used to build it. They show as small peaks beside the large one, and they are part of the arithmetic. The same methods are run on the PE-22-28 8mg vial as on every other lot on this shelf, and formulae and expected masses for compounds of this class can be checked through the NCBI chemistry and literature databases.

Why the name is inconsistent, and how to store the PE-22-28 8mg vial

Nomenclature in this field is a mess. Laboratory codes, INCI names assigned for cosmetic labelling, nonproprietary names and supplier catalogue names all circulate at once, and one molecule can appear in four catalogues under four names. Several abbreviations on this shelf unpack into descriptions of activity. They are not unpacked here, and where a compound cannot be described without that, only its measurable properties are described. The catalogue name carried by the PE-22-28 8mg vial is the one the trade uses, and a trade name is not an identifier.

Sealed, cold, dark and dry. Short term storage at refrigerator temperature and long term storage at minus 20 degrees Celsius or colder are the standard conditions for lyophilized peptide material of this kind. Keep the certificate with the vial, since the lot number is the only thing joining the two.

Research use only, and what this page will not tell you

Sold to qualified purchasers for laboratory research only. Not for human or veterinary use. The page carries no dosing information, no protocol, no administration instructions and no account of physiological activity, because publishing any of those would be describing a use this material is not sold for. We will not supply them privately either. No part of this page describes a use for this material in a person or an animal. Bacteriostatic water, sterile diluents and syringes are stocked separately rather than sold as a set with the vial.

Two things are true at once. This is sold as a laboratory reference material, and that sentence on its own settles nothing, because a page that describes effects, timing or quantities for a person is describing a use whatever the footer says. See research use only is not a legal strategy.

Lots that failed their own stated figures are kept rather than deleted, which is the point of an archive as against a highlight reel. This item sits on the nootropic shelf, inside the research peptide catalogue, and every certificate we hold is on the lab results page.