[Lab] TFC BPC — Janoshik came back 98.4% against a claimed 98.0%
TFC BPC — Janoshik came back 98.4% against a claimed 98.0%. That is the headline. The document, the batch and the service are below so you can argue with the method rather than with me.
Figures up front so nobody has to dig: 98.4% and 98.0%.
Bought small on anything without a testing history here. That rule has never once cost me anything.
Storage conditions came back specific rather than generic when I asked. That told me somebody had actually done stability work.
If somebody has the same thing measured a different way, post it next to mine and we will see whether they agree.
- TFTFC source pageTianjin Finder Chemical Co., Ltd. · Tianjin · 98% here, rank 1 · shop at tfcpeptides.com →
nofollow and sponsored; nobody here is paid for it.best — the order this archive was captured in
Naming in this space is inconsistent. Several widely used names map to more than one molecule, so a catalogue number and a sequence beat a common name every time.
Which exact molecule? That name covers more than one.
the less-tested the compound, the more the identity test matters
Purity methods differ by compound class. A gradient and wavelength developed for one peptide will not necessarily resolve the relevant impurities of another.
Purity methods differ by compound class.
two_mil_or_one is right that a purity figure without a method is not comparable to one with a method.
catalogue depth is not the same as catalogue quality
On the thin testing history in this board, and what to do about it.
Most of the compounds discussed here have a handful of independent results across the entire site, and several have none. That is a fact about how few members have paid for testing, not a judgement about the material.
What follows: buy small, test identity first for anything unusual, and post the result even when it is unremarkable. The vendor source pages are built from exactly these submissions, and the compounds with the thinnest coverage are the ones where one more entry changes the picture most. Research material is not approved for human use, so what this board can usefully build is an analytical record.
On the thin testing history in this board, and what to do about it.
Disagreeing with this bit: handling for one compound does not transfer to another by default.
Disagreeing with this bit: handling for one compound does not transfer to another by default.
This is the rule for anything unusual. Identity before anything else.
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.
Has anyone here tested that compound at all?
Push back: handling advice from one compound does not transfer to another just because both are peptides.
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.
The three questions to ask before ordering anything from the long tail of a catalogue.
What exactly is it — catalogue number or sequence, not a common name, because several common names map to more than one molecule. How was identity established — mass against theoretical, ideally, rather than a bare purity figure. What are the storage conditions, stated specifically, with a state and a duration attached.
Then two commercial questions that save time: is this a stocked line or made to order, and what is the lead time in writing. All five are one email, and the shape of the reply tells you a great deal before any material moves.
[deleted]
Yes. Naming conventions in this corner are loose enough that the same word covers several different molecules.
Net peptide content on the certificate?
Net peptide content on the certificate?
Agreed — and the naming problem is worse than most people here realise.
purity methods differ between compound classes
- 1The three questions to ask before ordering anything from the long tail of a…6 comments in this branch · started by u/heart_rate_bump