Compound-specific δ13C and δ15N analyses of fatty acids and amino acids for discrimination of organic, pesticide-free, and conventional rice (Oryza sativa L.)

•This work focuses on the detection of incorrect or fraudulent organic rice labeling.•Compound-specific isotope analysis was employed for organic rice authentication.•Best results were achieved by OPLS-DA combined with δ13C/δ15N amino acid analysis.•δ13Clysine was identified as the greatest contributor (VIP > 1) for all OPLS-DA models.