Fig. 2: Quantitative modelling of β-carotene spiked into coconut oil to rank the palm oil samples according to β-carotene content.
From: Raman on the palm: handheld Raman spectroscopy for enhanced traceability of palm oil
PLS-R prediction plot for β-carotene spiked into coconut oil across concentrations ranging from 0 to 2 mM (a). Three Raman spectra were recorded for each concentration and the mean value is shown. Predicted relative β-carotene levels in palm oil samples from each country based on the PLS-R model (b). To calculate the LoD, a PLS-R model was constructed using β-carotene spiked at concentrations between 0.1 mM to 0.5 mM, increasing in 0.1 mM increments. This concentration range was chosen because if an extended range of concentrations is used, beyond what would be seen, then the LoD generated is underestimated and thus will give an artificially optimistic result.
