Olive Oil NIR/VIS Spectra – 001 (ChemSpec)

June 25, 2012
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(This article was first published on NIR-Quimiometría, and kindly contributed to R-bloggers)

I continue with the practicing with ChemSpec, and this time I import seven spectra of olive oil. This time I have been more careful and I have the frequency column as numeric form the CSV file. Once I have the spectra (with and offset):
Take in account the comment form Bryan in the previous post when importing CSV files into ChemSpec.


 I want to go into some details in this post about the visible part of the spectra. So let´s select just this part of the spectra:
plotSpectra(olive, title = "olive oil", which = 1:7,
xlim = c(400,800),yrange = c(0.5,3),offset = 0.3)



Here we can see the bands for the carotenoids (3 peaks in the range between 40-500 nm) and  the band for the chlorophyll  which shifts between 650 and 700 nm. These bands can be change, depending of many circumstances (starting from the quality of the extraction process),  and affects obviously the color of the oil.
These bands change during the oil storage depending of the light conditions and disappear when the oil is refined.

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