4. Conclusion
In this work, the application of UV–Vis spectrometry coupled with chemometrics for studying the impact of heating on edible oils (CO, SFO, RO, PO, SBO, SO) and determining their acid value was investigated for the first time. The peak at 370 nm in the first derivative spectra was a common indicator of the heated oils. The PLS models for each kind of oil allowed predictions with R2 of 0.9907–0.9977 and RMSE of 0.0230–0.0794 and the integrate SVR model for all the six kinds of oils possessed a satisfactory predictive ability with a R2 of 0.9932 and a RMSE of 0.0656. These implied that UV–Vis spectrometry coupled with chemometrics had a good potential for quantitative analysis of AV of edible oil and preliminarily identifying whether an oil sample was heated or not.