Description
The Dihexa 10mg vial is supplied as a hexapeptide derived analog of angiotensin IV, catalogued as Dihexa, freeze dried and sealed. The fill weight is 10 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.
The full chemical name is a long string of acyl and residue descriptors, which is the reason every catalogue uses the short name instead. The label on the Dihexa 10mg vial carries the compound, the fill weight and the lot number, and that is the extent of it.
Contents of the Dihexa 10mg vial
What follows is the specification for the Dihexa 10mg vial, with the measured figures on the lot certificate.
| Compound. | Dihexa |
|---|---|
| Vial content. | 10 mg net peptide content |
| Form. | Lyophilized, white to off-white, sealed under vacuum |
| Sequence length. | On the lot certificate |
| 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 $17.52 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 Dihexa 10mg vial
Peptides are shipped dry for a simple reason: in solution they degrade, and nobody can control the temperature of a parcel in transit. Freeze drying removes the solvent under vacuum and leaves a solid with a low residual water figure, which the certificate states. The cake that results is physically fragile and can break loose and rattle. A broken cake is cosmetic. The number that matters is the fill weight. Nothing about the Dihexa 10mg vial is sold by volume.
How the per milligram figure is worked out
Milligram content is the unit the Dihexa 10mg vial is sold in, because it is the only figure that makes two listings comparable. Price per milligram here comes out near $17.52. Work it out the same way every time, price over milligrams, and two listings become comparable even when one is a small vial and the other is not. Compare the Dihexa 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.
What the certificate of analysis reports
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 Dihexa 10mg vial is specific to the lot and not to the product line.
Assays are run by an outside contract laboratory rather than in house. Independence of that kind matters, and it has a limit: the figure still depends on the sample that was submitted, which is why lot by lot testing rather than periodic testing is the part that matters. Stock is withdrawn from sale where the certificate for the Dihexa 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
HPLC is a separation method, and the number it yields is a ratio. Material passes through a packed column, each component leaves at its own retention time, and the detector output is integrated into peak areas. Dividing the target peak by the total gives the purity figure printed on the certificate. What the method does not tell you is identity, which is why a second method is run alongside it. The same methods are run on the Dihexa 10mg vial as on every other lot on this shelf, and formulae and expected masses for compounds of this class can be checked through the FDA drugs section.
Names, abbreviations and how to keep the Dihexa 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. Some names in this category spell out an intended effect once expanded. Those stay abbreviated, because writing them out would turn a catalogue entry into an assertion about biological activity. The catalogue name carried by the Dihexa 10mg vial is the one the trade uses, and a trade name is not an identifier.
Handling notes are short. Sealed, dry, cold and dark, at 2 to 8 degrees Celsius for the short term and minus 20 degrees Celsius or below for anything longer. The stability window for the lot is printed on this listing. Keep the certificate with the vial, since the lot number is the only thing joining the two.
What this listing refuses to say
The material is a reagent. It is not a medicine, not a supplement, not for human or veterinary consumption, and it is sold for in vitro and laboratory work by purchasers qualified to handle it. You will not find a dose, a schedule, an injection site or a mixing instruction here. Those belong to a use that is not offered. 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.
The limits of that sentence need stating. A research use only line describes what is sold, it is not a shield, and the enforcement record shows whole product pages being read rather than disclaimers alone. See research use only is not a legal strategy.
Read the certificate, check the lot number against the vial, and the listing has told you everything it can tell you. This item sits on the nootropic shelf, inside the research peptide catalogue, and every certificate we hold is on the lab results page.
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