Those tests both work really well as preindicators if you actually know what your doing and how to read them. Why your suggesting jano over analiza is what im curious about . Ive only been met with group think comments not basis for one being superior because that I would love to hear . How do we know janos 89 was correct or is that just the board favorite so it automatically means the other was wrong . 89 is extremely low also thats 11% contamination and would cause visible change in the product if viewed under a microscope yes I do that also to check thr crystals appearance and look for particulates that should be present.
It works great for anything with a MP above 75°C anything below thats melts around or slightly above ambient temperature it sucks for . But anyone that truly understands what there doing would have never even used it for test D . And you said within half a degree of the MP the MP is usually a range but what your looking for in a purity test is the length of time from the start of melt till its a complete liquid . They will all melt in that range the duration is the important factor. Your faded line in TLC doesn't say much either what were your RF measurements. Thats why you use a wide range of tools for analysis.
I prefer the ones who use superior testing equipment, proper reference materials and has properly calibrated equipment is the testing lab i prefer.
So either 1. Jano
or 2. my local Uni (if i need it quickly/cheaper) or if i want to recheck.
Jano and Uni are usually similar, while AB ALWAYS returns higher purity than my two go-to options. (Test base from QSC, which sent in, had 96 at my uni, 95 at jano, and the absolute maximum at AB, if I recall correctly. I have also seen some reports from friends regarding verifiably shit <92% raws coming back as acceptable >96% from AB)
89% purity is shit, I agree, but sadly common in the current market. (or for cumpounds like tren base, BU, MENT E and D, etc.)
MP, as you said, should always be around the same, with the only differences being the speed at which the compound melts. Great, but in what world do I care about the specifics if i can simply send it off for testing? (after MP test)
it will never be as assuring as running GCMS or a HPLC on it.
for TLC, I geniunely do not think I could find proper, satisfactory reference materials for Test D at a reasonably price. and proper reference materials are everything when it comes to TLC
Plus, a washed line definitely says somethingIf it looks like a texan highway (one compound should not move at different speeds along the same line, if you do it right you should have ONE DOT, not multiple dots/a smear on a line), I do not believe the compound to be high in purity.
ALL that being said, TLC is a qualitative method, not a quantitative one. It is useful for determining a compound, but MP tests are more useful for that purpose.
TLC is NOT GREAT FOR DETERMINING PURITY. like, at all. It only throws warning signs when you have absolutely piss poor product. which a MP test for confirmation of compound and a subsequent standard raws test at jano would also do. Doing MP (+jano if compound is acceptable in regards to melting speed etc.) is far cheaper and a lower time investment than doing TLC. also avoids stinking up your lab with ea and aa or other solvents.
RF was .4something., while the reference material was around .5 (iirc) (via Sigma aldrich) was a much clearer dot, without streaks/ no breaking up.
Anyways, you seem to know quite a bit, and the idea of actually looking at the product through a microscope is fun. I will incorporate that once I get some more stuff in. Other than that, I still believe in Labs with proper Equipment and reference material and calibration of said equipment over whatever it is AB is doing for raws testing.