[Lab] SGN BPC — VendorInvestigate came back 97.8% against a claimed 97.0%
Filing this under things worth writing down: SGN BPC — VendorInvestigate came back 97.8% against a claimed 97.0%.
Figures up front so nobody has to dig: 97.8% and 97.0%.
Net peptide content accounts for counterion, water and residual solvent. On some of these compounds the gap between purity and net content is substantial and entirely honest.
Purity methods differ by compound class. A gradient and wavelength developed for one peptide will not necessarily resolve the relevant impurities of another.
Happy to answer the boring questions. Those are usually the ones worth asking.
- SGSGN source pageSangon Biotech (Shanghai) Co., Ltd. · Shanghai · 95% here, rank 8 · shop at sangonbio.com →
nofollow and sponsored; nobody here is paid for it.best — the order this archive was captured in
Which exact molecule? That name covers more than one.
Asked for a catalogue number rather than removing. Common names are ambiguous here and it makes threads unusable later.
Correction: that name covers two different molecules and the thread has been discussing both as one.
Correcting my own comment: the storage condition I quoted was for the lyophilised powder, not for solution.
a secretagogue and a fragment are not the same class of thing
lyophilised and stored cold is the default for a reason
What lead time were you quoted for that line?
Small fix — that is net peptide content, not purity. Both are on the certificate and they differ substantially here.
Stocked lines and made-to-order lines have different lead times and different storage histories. Both are ordinary; the difference is worth confirming before you commit.
handling and storage vary enormously across this catalogue
a mass spectrum costs little and answers the real question
That result is an area percent from an unspecified method, which is not the same as the identity confirmation being discussed.
Asked for identity confirmation on an unusual line and got a mass spectrum with the theoretical mass alongside. That is the answer I now look for everywhere.
Storage conditions came back specific rather than generic when I asked. That told me somebody had actually done stability work.
the less-tested the compound, the more the identity test matters
Stocked lines and made-to-order lines have different lead times and different storage histories.
elin_trevino is right that a purity figure without a method is not comparable to one with a method.
Net peptide content on the certificate was well below the purity figure and both were honest. Chemistry, not deception.
- 1Which exact molecule? That name covers more than one.8 comments in this branch · started by u/throwaway_9182
- 2Stocked lines and made-to-order lines have different lead times and…8 comments in this branch · started by u/elin_trevino