dreamtheatervt said:
There is probably some conversion chart to convert capsacium/pepper to Scoville, but those are probably secrets of the various analysis companies (they want your continued business).
I have often seen the conversion quoted as SHU = 15 * ppm. But thinking about it just a few minutes ago, using the number 15 stuck me as odd, and set off my engineering b.s. detector. This is because the most concentrated substance possible would be 1,000,000 parts per million. That would yield a maximum Scoville rating of......15,000,000? What's going on here?
I researched a bit into the efficacy of weaponized capsaicin, figuring that would be a good place to start. I found a reference to American Spice Trade Association, Analytical Methods 21.0. This document outlines a recognized procedure to conduct a sensory test for scoville units. Going on that, I found out about ASTA Analytical Methods 21.1, dated 1980 - governing a recognized procedure for HPLC testing, which declared the maximum possible scoville rating to be 15,000,000.
So, at last,
this facinating page, which states that the ASTA didn't declare the maximum Scoville rating to be 16,000,000 until 1997.
So, by that guide, the conversion from HPLC to scoville should be SHU = 16*ppm, or more directly SHU = 16*%capsacin*1,000,000.
Not that it has a huge effect. For instance, if a certain famous sauce was tested in 1995, and came out at 50,000, then was tested again in 1999, it would come out at 53,000 SHU. Probably within the error of the test. But still, an interesting bit of history.