[Question] related substances — what am I missing here
related substances — what am I missing here — that is what I am asking, and I have already read the wiki twice. Ask what the stability statement was written against — temperature, light, and whether it was the lyophilised powder or the reconstituted solution. Those are three different claims. The PDF creation date…
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.
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post the whole document, not the headline number
My first certificate had a compound name, a percentage and a logo. I thought that was normal. It is not, and now I know what to ask for.
ask for the storage condition the stability statement was written against
Cosigning. The batch identifier is load-bearing, and a certificate that cannot be tied to the vial in your hand is not about your vial.
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.