Frequently asked research questions

The proportion of total integrated peak area attributable to the main peak under the stated chromatographic conditions. It is a relative chromatographic statement, not a measure of peptide mass as a fraction of vial contents.

Because a truncated or deletion analogue can chromatograph cleanly. Mass spectrometry confirms that the main peak corresponds to the intended sequence rather than a closely related species.

Read the lot number from the vial label and locate that lot on the certificates page, where documents are indexed by compound and lot.

No. Net peptide content is the proportion of the lyophilized cake that is peptide by mass, after counter-ion and residual moisture. It is determined by a separate method and matters for exact molar concentration work.

That depends on your protocol and the compound's solubility characteristics. Bacteriostatic or sterile diluent is common laboratory practice; we describe mechanics rather than prescribing a protocol.

Add diluent slowly against the vial wall and swirl or roll to dissolve. Vigorous shaking shears peptide and generates foam, which can affect recovery.

Refrigerated storage suits near-term work; for longer periods, aliquot into single-use volumes and freeze. Repeated freeze-thaw cycling is the most common cause of measurable potency loss.

Because storage conditions and chain of custody cannot be verified after a vial leaves the facility. Shipments arriving damaged, or lots that do not match their certificate, are resolved directly with laboratory support.

Support covers documentation, analytical methodology and handling. Experimental design and anything involving administration to a living subject are outside what we can address.