Independent analytical testing. Results apply only to the sample received, for research use only.

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Peptide base versus gross salt

Seen on content calculation basis.

Definition

Two different bases for expressing content. Peptide base excludes counter-ion and residual moisture; gross salt includes them. The same vial gives two different numbers depending on which is used, so the basis is agreed at scope review and printed on the certificate.

Related terms

Counter-ion
The ion paired with a charged peptide in its salt form, commonly acetate or trifluoroacetate.
Peptide content
The measured amount of target peptide in the sample as submitted, determined against a calibrated reference standard and expressed on a stated basis.

About quantitation and content

How much is actually there, on what basis, and against what standard.

Label claimResidual moistureReference standardCalibration curveLinearityWorking rangeRecoveryLimit of detectionLimit of quantitationReporting limitMeasurement uncertaintyMatrix effect

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