[PSA] area percent is not what most of this community thinks it is
area percent is not what most of this community thinks it is. If you already knew this, the post is not for you and you can scroll on.
Net peptide content is the fraction of the powder that is actually peptide once counterion, water and residual solvent are accounted for. A 99% pure acetate salt can still be about 85% peptide by mass.
Related substances itemised individually is a much stronger document than a single total, because it tells you the shape of the impurity profile rather than its size.
UV at 214nm sees the peptide bond and picks up almost everything; at 280nm you are looking at aromatics only. Which wavelength the number came from is part of the number.
Tell me where this is wrong. That is the useful part of posting it.
best — the order this archive was captured in
Area percent is the peak area of your compound over the total integrated area, at one wavelength, on one gradient. It is a relative measure of what the detector saw, not a mass fraction of the vial.
That is not what the method line says. It names the technique; it does not certify the operator.
Pushing back a little: a missing field is usually presentation, not concealment. Ask for the full document before drawing conclusions.
water content is on there and everyone skips it