Enter two quotes. The result is the cost per gram of actual peptide, after salt, water, freight and qualification. Nothing you type is stored or sent anywhere.
active77.1—related1.4—counterion14.2—water5.4—solvent0.9—unaccounted1.0
▲ 1.0% of mass unaccounted for — ask for a full mass balance.
Quoted
$412
Landed $443/g
True cost / g active
$574
active88.4—related0.8—counterion5.8—water4.1—solvent0.4—unaccounted0.5
Quoted
$486
Landed $489/g
True cost / g active
$553
Supplier B lands at $553 per gram of active peptide against $574 for Supplier A, a difference of $20,853 per kilogram of active peptide, after freight, qualification and payment terms.
Measured by amino acid analysis or nitrogen determination. It already nets out the counterion, the water and the residual solvent, so a jar at 78% content is 78% peptide before purity is considered at all. Trifluoroacetate salts sit far lower than acetate.
Area percent across the chromatogram, measured on a peptide basis. This is the number most suppliers lead with, and on its own it says almost nothing about what you are buying by weight.
Content times purity gives the fraction that is usable peptide. Applying only one of them is the most common costing error in this market, and it consistently favours the supplier with the heavier salt.
The Pure Chain