Cocoa butter and cocoa solids
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Tasting Notes
Lots of pros and cons here. A few highlights to consider:
NMR and NIR will be be expensive instruments to acquire ($50-90k?).
NMR can be heavily influenced by metals content - so your process becomes very important. IE if you have a ball/attritor mill, the media will abrade off small pieces of metal and will impact your results.
NIR is heavily matrix and temperature dependent - you'll need to have a robust calibration curve for accuracy. Actually that's true with NMR as well.
If you have the funds to spend, and the expertise to create and maintain a calibration curve - i prefer the NIR, as you can calibrate it to predict other things as well. I've never used Oxford instruments specifically, but that they indicate in their literature that you only need 2 calibration points would concern the hell out of me.
A 3rd option is gravimetric extraction. Grinding your sample up, extracting the lipids with a solved, evaporating the solvent, and measuring what's left behind. Far less expensive up front costs, but you are now dealing with a solvent, and the consistency of the tech doing the prep work is important.