Fig. 1. Fluorescence spectra of original and corrected Z7 samples. (a) Original three-dimensional spectral map; (b) corrected three-dimensional spectral map; (c) original contour map; (d) corrected contour map

Fig. 2. Trilinear model

Fig. 3. Fluorescence spectral data of Z7 before and after compression. (a) Before compression; (b) after compression

Fig. 4. Partial emission spectra of Z7 before and after compression. (a1)-(a4) Before compression; (b1)-(b4) after compression

Fig. 5. Analytical results of Z7 and Z9 with APTLD algorithm. (a) Emission spectra; (b) excitation spectra

Fig. 6. Analytical results of Z7 and F6 with APTLD algorithm. (a) Emission spectra; (b) excitation spectra

Fig. 7. Analytical results of Z7 and F12 with APTLD algorithm. (a) Emission spectra; (b) excitation spectra

Fig. 8. Fitting curves between fluorescence intensity of each component obtained by APTLD algorithm and proportion of each component. (a) Sesame essence in F1-F7 and L1-L4 samples; (b) corn oil in F1-F7 and L1-L4 samples; (c) sesame essence in F8-F13 and L5-L8 samples; (d) rapeseed oil in F8-F13 and L5-L8 samples

Table 1. Brand of vegetable oil samples

Table 2. Proportion of each component in adulterated oil samples

Table 3. Compression results of several analytical samples

Table 4. Predicted proportion and recovery rate of each component in adulterated sesame oil samples L1-L4

Table 5. Predicted proportion and recovery rate of each component in adulterated sesame oil samples L5-L8