Quantitative determination of acacia honey adulteration by terahertz-frequency dielectric properties as an alternative technique

•Dielectric properties of adulterated honey were measured in the terahertz region.•Correlations of dielectric property with adulterant at all frequencies were found.•PLS models for the prediction of invert syrup proportion were constructed.•Stability competitive adaptive reweighted sampling was applied to select variables.•Accuracy and uncertainty in the model predictions were quantified.