Identification of irradiated meats by determining o- and m-tyrosine as markers

► Separation of trace m- and o-tyrosine from high amount of matrices was achieved. ► Effect of extraction parameters on recovery of m- and o-tyrosine was studied. ► Both LC-FLD and LC-MS/MS provided wide linearity, good recovery and repeatability. ► Quantitative evaluation of radiation dose by nonlinear correlation in each meat