Confirm four identifiers first: CAS 616204-22-9, molecular formula C34H60N14O12S, molecular weight 889 and the INCI name Acetyl Hexapeptide-8, also known by the trade name Argireline. It is supplied as a white powder. Then agree the analytical method and the calculation basis, because two certificates can report different numbers for the same material. One condition applies throughout: specification, shelf life, minimum order and documents are agreed per order and stated on the batch COA rather than asserted in a catalogue.
Why does the INCI name matter in a purchase order?
Because it is the name that appears on a finished-product ingredient list, while the CAS number is the name that appears on a chemical document. A buyer sourcing for a brand should confirm that the two refer to the same material in the supplier's documentation. If a quotation uses only a trade name, ask for the INCI name and the registry number in writing before the order is placed.
What can molecular weight tell you about a weighing error?
It makes small-quantity arithmetic checkable. At 889 g/mol, 1.00 g of the peptide is about 1.12 mmol. Suppose an illustrative laboratory batch of 10 kg of base is prepared at an inclusion of 0.05% by weight: that is 5.0 g of peptide. If the same brief were read as 0.05% of a 6 kg sub-mix, it would be 3.0 g instead. The 2.0 g difference is about 2.25 mmol at this molecular weight. These figures are an example of how a stated basis changes the weighed mass, not a suggested inclusion rate or a specification.
Which method questions should be settled before sampling?
Ask which HPLC column, gradient, wavelength and integration rule will be used; whether the assay is reported on an as-supplied or dried basis; and whether an LC-MS identity trace will accompany the COA. Also ask about solubility in the intended matrix: a powder that disperses well in one base can behave differently in another, so the sample should be evaluated in the actual formula.
What should the check sheet contain?
Check: registry number, INCI name, molecular formula and weight, appearance, sequence confirmation, assay method and basis, identity method, solubility in the intended base, storage and the document list. What to confirm: which results appear on the batch COA, which limits were agreed before the sample shipped and which documents accompany a commercial shipment.
How do you compare it with other cosmetic peptides?
Build a two-column sheet with the identifiers above for each substance. Acetyl Hexapeptide-8 and Palmitoyl Pentapeptide-4, for example, have different registry numbers, different molecular weights and different INCI names, so a quotation that lists only "anti-ageing peptide" cannot be compared with another. Our product pages use this same structure.
What should not be assumed from a catalogue page?
Do not assume a purity figure, a two-year shelf life, a one-gram minimum order, a certificate badge, guaranteed stock or a fixed lead time. Those are supplier-specific commitments and belong in the quotation. We describe identifiers and the questions a buyer should ask, not finished-product performance.
References
[1] CAS Common Chemistry, entry 616204-22-9. [2] INCI naming convention, Personal Care Products Council. [3] General practice for HPLC assay and LC-MS identity confirmation of synthetic peptides.
Request the documentation
See our Acetyl Hexapeptide-8 product page for the 15-item identifier block, then email sales@yaxbio.com to request a COA, MSDS, TDS, a sample or a bulk quotation.