Both FTIR and fluorescence spectroscopy are rapid, non-destructive,
environmentally friendly analytical methods. Adulteration
of walnut oil could be detected accurately and rapidly
using FTIR or fluorescence spectroscopy in combination with
chemometrics. The determining limit of soybean oil adulterated
in walnut oil was 10% by FTIR spectroscopy, and fluorescence spectroscopy
has a high sensitivity with a determination limit of less
than 5%. Fluorescence spectroscopy is therefore more applicable
than FTIR spectroscopy in the quantitative determination of walnut
oil adulteration.