Definition
The range within which the true value is expected to lie, given the known sources of variation in the measurement. Any quantitative figure is a best estimate with an uncertainty around it, not an exact count.
About quantitation and content
How much is actually there, on what basis, and against what standard.
Peptide contentLabel claimPeptide base versus gross saltCounter-ionResidual moistureReference standardCalibration curveLinearityWorking rangeRecoveryLimit of detectionLimit of quantitationReporting limitMatrix effect