Because there is such a high worldwide demand for cinnamon spices, true cinnamon (Cinnamomum verum) powder is often adulterated with another inferior quality of cinnamon known as cassia cinnamon (Cinnamomum aromaticum). Korean researchers employed Fourier transform near-infrared (FT-NIR) and Fourier transform infrared (FT-IR) spectroscopic analysis to determine the spectral differences in authentic and adulterated samples. Absorbance spectra of 195 samples of true, cassia and various adulterated samples (5-50% w/w adulterant) with 15 replicates for each sample were collected. The partial least square regression (PLSR) models with spectral pre-processing methods were applied to predict the presence of cassia cinnamon in true cinnamon powder. The predictive value of FT-NIR data was greater than the FT-IR data. The study shows that FT-NIR and FT-IR spectroscopic techniques combined with multivariate analysis could be utilised as a controlled procedure or as an alternative rapid detection method to identify adulterated cinnamon powder.
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