-The detection of honey adulteration with invert sugar syrups from various C3 and C4 plant sources was realized by coupling an isotope ratio mass spectrometer both to an elemental analyzer and to a liquid chromatograph (EA/LC-IRMS). For 451 authentic honeys measured, the individual δ 13 C values of bulk honey, its protein fraction, fructose, glucose, and di-and trisaccharides ranged from -22.5 to -28.2% and did not show differences (Δδ 13 C) of more than ± 0.9% (average), with a maximum standard deviation of 0.7% . The Δδ 13 C (fructose -glucose) value was significantly lower (0 ± 0.3% ). Based on the obtained results and considering a confidence level of 99.7%, the following limits for Δδ 13 C values of authentic honey are proposed: Δδ 13 C max.: ± 2.1% (maximum difference between all measured δ 13 C values); Δδ 13 C fruglu: ± 1.0% ; Δδ 13 C (% ) protein -honey: -1.0% . The newly developed EA/LC-IRMS method and the purity criteria defined represent a significant improvement compared to existing methods.honey / adulteration / LC-IRMS / EA-IRMS / δ 13 C values / C3 sugar / C4 sugar

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