Sulfonamide Residues: Honey Quality in the Czech Market

Table 1

Retention times, matrix calibration curve, and linear range of the four SAs (LC–MS/MS).

Analytes	Retention time (min)	Calibration curve	Linear range (μg/l)	R^2
SDZ	2.66	y = 238.125x + 28.0015	0.1–100	0.997
SDX	3.56	y = 618.869x + 3.41238	0.1–100	0.996
SMZ	3.49	y = 350.874x − 25.7008	0.1–100	0.996
STZ	2.82	y = 500.568x − 46.9565	0.1–100	0.998

SAs: sulfonamides; LC–MS/MS: liquid chromatography with tandem mass spectrometry; R²: correlation coefficient; SDZ: sulfadiazine; SDX: sulfadoxine; SMZ: sulfamethoxazole; STZ: sulfathiazole.