Assessment of the water content in extra virgin olive oils by Time Domain Reflectometry (TDR) and Partial Least Squares (PLS) regression methods

► The research aims to assess the water content in extra virgin olive oils (EVOO) by TDR. ► EVOO samples ranging from 714 to 2800 mg of water/kg of oil were considered. ► Predictive methods were built by using PLS regression analysis of reflectometric signals. ► R2 values up to 0.984 were obtained.