hmmm… nice paper, it has put all of the methods of testing cannabinoid potency, including TLC and HPLC… Spectrophotometry… Sounds tempting… But… They used cannabinoid isolates, not flower material… AFAIK it would be impossible to detect potency of each cannabinoid together from a flower sample… Maybe with some heavy, 11-dimensional topology mathematic formulas, i sure hope there is a formula… You would need UV spectrophotometer… They used this one:
Varian Cary 1e CARY1E Uv-visible Spectrophotometer System With Manuals for sale online | eBay
" A spectrophotometer is a color measurement device that is used to capture and evaluate color on just about anything, including liquids, plastics, paper, metal and fabrics." - Difference Between a Spectrometer and a Spectrophotometer | X-Rite Blog
There is a project for DIY spectrophotometer:
A Simple DIY Spectrophotometer : 8 Steps (with Pictures) - Instructables
but you would need uv spectra diffraction grating and a reliable UV source, or at least such a software that can account for spectre of UV lamp and some diy difrraction grate… Do you have any other resource about this method? Ill go for a hunt, ill report when i find something that can be of use to us… Peace…
*edit:
Ill post here what i find, so that i dont spam the thread…
How plotting of data is done:
The Spectrophotometer: A demo and practice experiment - YouTube
Spectrophotometry Experiment - Full Explanation & Analysis by Mr Pauller - YouTube
Difference Spectrum–Deconvoluting a Mixture - YouTube
What is spectrophotometry
2.1.5: Spectrophotometry - Chemistry LibreTexts
Hmmm… It seems it should be possible to determine each cannabinoid in a mixture, but we would have to know measured extinction (absorption) coefficient on each wavelenght to have precise data… Something like its shown in 3. YT video, not just ext. coeff. at peaks… Quest goes on!
*edit nr. 2:
ok, i found an online tool to convert graph to number data:
WebPlotDigitizer - Extract data from plots, images, and maps (automeris.io)
i wont play with it yet, as it is morning christmas where i am, and i want to be with my family… but im definetly chasing this one!! if this works, only thing left to do is to make our own and test, test, test!!! <3 good job on finding this one mate! it may be of great usefulness to us…
peace…
edit nr. 3:
it seems there is a good diy solution for spectrophotometer found here:
(129) Building a Nanodrop Style UV/Vis Spectrometer - YouTube
but it measures only from 400nm… for anything below that, you need another sensor and special laser source, or deuterium bulb… im not giving up yet, but ill stop for today… ill report when i find something useful by the sunday… peace…
edit nr. 4:
couldnt rest, had to search for parts… so far, nothing useful… deuterium lamp is used as light source, which cost around 150$ to 200$ as for sensor, there are cameras that could pick >= 200nm wavelengths that cost around 500$… imo its better then to aim for cheap chinese uv/vis spectrophotometer, i inquired for some looking more professional, but it can be found for 2000 usd… if you buy your own lamp and camera, you need to account for spectrum curve of emitter and sensor, finished products have that accounted for… there are cameras with removed uv sensors, but i couldnt find any data on spectrum they detect… done as much as i could, hope youll have more luck… peace…