Definition
Water retained in a lyophilized powder. Like counter-ion, it is weight in the vial that is not peptide, and hygroscopic material picks up more of it every time a vial is opened.
Related terms
About quantitation and content
How much is actually there, on what basis, and against what standard.
Peptide contentLabel claimPeptide base versus gross saltReference standardCalibration curveLinearityWorking rangeRecoveryLimit of detectionLimit of quantitationReporting limitMeasurement uncertaintyMatrix effect