A temperature-controlled ZnSe ATR-MIR benchtop and diamond
ATR-MIR portable handheld spectrometers have proven to
be fast, reliable and rapid techniques to characterize and authenticate
sacha inchi oil. The ATR-MIR portable handheld instrument
gave spectral information comparable to the ATR-MIR benchtop
but there was a slight increase in noise. Sacha inchi oil (44%) has
a x-3 composition similar to that of flax (53%), but it had approximately
twice as much x-6 fatty acids. Combining FT-IR spectroscopy
with chemometrics has proven to be a great alternative to
traditional testing methods. SIMCA projection plots formed distinct
clusters for each oil class, making prediction about oil fatty
acid composition easy. PLSR showed good correlation coefficients
(R2 > 0.9) between reference tests and spectra from infrared devices,
allowing for rapid determination of fatty acid composition
and predicting oxidative stability.