AssayIndex
Content & mass

Salt-free basis

A content figure recalculated as if the sample contained no counter-ion. Like the anhydrous basis, must be stated explicitly.

Related terms

Anhydrous basis
A content figure recalculated as if the sample contained no water. Must be stated, or a mass balance will not close.
Counter-ion
The anion paired with a peptide's basic residues in the isolated salt. Usually trifluoroacetate or acetate. Mass in the vial that is not peptide.

Where this term appears

The glossary exists to make record pages readable without a chemistry degree. Every technical term on a report resolves here.