The Electronic nose Heracles II (AlphaMos, Toulouse, France) was used to discriminate the odor patterns of different aroma models. Whole milk was irradiated at UV-A doses 0(control), 143, 279, 571, and 838 mJ/cm 2 . For each treatment, 10 ml of each sample was placed in a 20 mL glass vial. The samples were prepared in a septa-sealed screw cap vials and equilibrated for 200 s at 50°C, separately. Subsequently, the aroma headspace above the sample was introduced into the electronic nose at the speed of 270 L/s using an automatic headspace sampler. The column temperature program was set at 40°C (1 min)-2°C/min-200°C (3 min), and the injection temperature of the injector and detector were set at 180°C and 220°C, respectively. The FID detector placed at the end of each column digitalized the acquired signal every 0.01 s. The Heracles electronic nose was equipped with a non-polar column (MXT5: 5% diphenyl, 95% methylpolysiloxane, 10m length, and 180µm diameter), and a slightly polar column (MXT1701: 14% cyanopropylphenyl, 86% methylpolysiloxane, 10m length, and 180µm diameter) working in parallel mode. A single comprehensive chromatogram was generated by joining the chromatograms obtained from these two columns. For calibration of the instrument, an alkane solution (from n-hexane to n-hexadecane) was used to convert retention time in Kovats indices and to identify the volatile compounds using specific software (AromChemBase). Each analysis was repeated a total of three times, and all of the response data was analyzed using Alpha Soft software (Version 3.0.0, Toulouse, France).