Don't give a shit Jim, you are God, you've made that obvious...You are now the official tester of MESO, I'm off to my night run...
-Myth-
-Myth-
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Not God, it's called Narcissistic personality disorder.Don't give a shit Jim, you are God, you've made that obvious...You are now the official tester of MESO, I'm off to my night run...
-Myth-
FLENSER, I don't get involved in the explanation of the results anymore because I am not a chemist nor an expert. Even the most basic answers I am hesitant to answer because of the way that it gets twisted around. I am happy with helping someone out from time to time. That being said, I DID ask the dr at the University your question and his reply follows but I fear it is not as black and white as I had hoped it to be.
For that particular sample, the purity was low (29%), because many ions present (245, 397, 548, 700, 873, doubly charged and all related to each other) in abundant quantities that reduced ionization of 345 (Test Propionate), thus affect its purity estimation. These ions were not normally seen in the similar samples where we used them for reference, it must be something added other than the vegetable oils normally seen.
The concentration estimation was based on vegetable oil background for ionization from most other samples, so it was off, due to, the ionization competition in the electrospray, so that 76 mg/ml could be underestimate. Very likely, the manufacture did have 1 gram pure material dissolved in 10 mL solvent to make a 100mg/ml solution, but when it was analyzed by ESI, because of other ions in the solvent that are so much ionized, they reduced amount of Testosterone Propionate detected.
In short, our estimation can be affected by many variables, only when the variables are controlled (with reference compound, known amount in the same environment), then the estimation can be accurate.
We don't know "the purity is 72%" and THAT is why NOBODY is happy. I asked you earlier to post the calculations that you used to arrive at the 75% purity you claimed to have found and you ignored me.
I did not ignore you, I wrote that the rough estimate is about 75% but the reported 72% is correct
by rough I meant just by taking quick look at this.
the report is good but it is simply missing more data.
How can a report be "good" if ALL data is not present?
I did not ignore you, I wrote that the rough estimate is about 75% but the reported 72% is correct
by rough I meant just by taking quick look at this.
the report is good but it is simply missing more data.
Here's an explanation of one of these tests. Don't believe it adds to the credibility of the analysis but paints a decent picture of how he is "guesstimating" purity data.
@Dr JIM
One thing that I haven't read in this thread or others regarding these tests and the lack of standards is the magnitude of the inaccuracies caused by the missing calibration data. Is there a way to know this?
@Dr JIM
One thing that I haven't read in this thread or others regarding these tests and the lack of standards is the magnitude of the inaccuracies caused by the missing calibration data. Is there a way to know this?
If the accuracy of these reports is, let's say +-5% without this data, and +-.05% with it, then this is a largely moot point for a lot of members. It's always better to have more accurate information, but a ballpark number like 68-78% is not without value. If we know that a given sample tests in the 70s and another tests in the upper 80s/low 90s, that's a big leap from knowing nothing at all, even if that's as accurate as it gets for the time being. Is this knowable?
As soon as the raw comes, it will be sent directly for MS. Hopefully this whole process will take no longer than 3 weeks, but you never know. I still have a decent bit left but you never know when large orders will come in.