Description
The KPV 10mg vial is supplied as a reagent: Lys-Pro-Val, the C terminal tripeptide of the alpha-MSH sequence, lyophilized, sealed and assayed by lot. The fill weight is 10 mg of net peptide content. The powder is white to off-white. Nothing here is addressed to a person, because the material is not for human or veterinary consumption.
The abbreviation is simply the three single letter residue codes, which makes it one of the few names in this category that is self explanatory. The label on the KPV 10mg vial carries the compound, the fill weight and the lot number, and that is the extent of it.
The KPV 10mg vial, specified
Everything that can honestly be said about the KPV 10mg vial before the certificate is opened is listed below.
| Specification | As supplied |
|---|---|
| Compound | KPV |
| Vial content | 10 mg net peptide content |
| Form | Lyophilized, white to off-white, sealed under vacuum |
| Sequence length | Three residues |
| Purity | HPLC, percent of total peak area |
| Identity | Mass spectrometry against expected mass |
| Water | Karl Fischer titration, percent by weight |
| Documentation | Independent certificate of analysis, tied to the lot number |
| Price basis | About $7.12 per milligram as priced |
| Supplied for | Laboratory research use only, not for human or veterinary consumption |
Lyophilized powder, and the price per milligram of the KPV 10mg vial
What sits in the vial is a freeze dried solid. Removing water by sublimation rather than evaporation keeps the peptide out of the temperature range where it would start to fall apart, and it leaves a solid that can sit on a shelf. Residual moisture is what is left of the process, and it is measured rather than assumed. The figure appears on the certificate as a percentage by weight. Nothing about the KPV 10mg vial is sold by volume.
Doing the division
Milligram content is the unit the KPV 10mg vial is sold in, because it is the only figure that makes two listings comparable. Run the division and the result is about $7.12 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 KPV 10mg 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.
Reading the certificate for this lot
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 KPV 10mg 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 KPV 10mg 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
Two weights can be quoted for a vial. One is everything the balance sees, which includes salt from the purification step and whatever water stayed in the cake. The other is the peptide alone. Only the second is a sound basis for comparison, and a vendor who does not say which one is being quoted is leaving the more flattering reading available. The same methods are run on the KPV 10mg vial as on every other lot on this shelf, and formulae and expected masses for compounds of this class can be checked through PubMed.
Names, abbreviations and how to keep the KPV 10mg vial
Naming is inconsistent across the whole category. Research groups issue internal codes, cosmetic registers assign INCI numbers and renumber them, regulators grant nonproprietary names, and vendors invent their own. 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 this 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, stated plainly
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 repair and recovery shelf, inside the research peptide catalogue, and every certificate we hold is on the lab results page.
Reviews
There are no reviews yet.