Table 2.

Antibiotics analyzed, recovery percentages, method detection limits, and concentrations detected in seafood samples in units of ng/g fresh weight.

Antibiotic Class	Compound, Recovery %, (MDL*), Concentration If Detected
	DETECTED	NOT DETECTED
Tetracyclines	Oxytetracycline, 100, (2.4), 7.72, 2.73 3.96, 8.68 4-Epioxytetracycline, 112.5, (3.9), 4.18	Anhydrochlortetracycline, 46.8, (7.4); Anhydrotetracycline, 137.5, (6.0); Chlortetracycline, 130.5, (9.2); Demeclocycline, 97.7, (6.0); Doxycycline, 117, (2.4); 4-Epianhydrochlortetracycline, 15.9, (24.1); 4-Epianhydrotetracycline, 104.1, (6.2); 4-Epichlortetracycline, 104, (9.1); 4-Epitetracycline, 130.5, (4.2); Isochlortetracycline, 87.2, (2.4); Minocycline, 109.5, (25.5); Tetracycline, 135, (3.5)
Sulfonamides	Sulfadimethoxine, 79.5, (0.2), 0.31	Sulfachloropyridazine, 83, (0.6); Sulfadiazine, 102.3, (0.6); Sulfamerazine, 111, (0.2); Sulfamethazine, 109, (0.4); Sulfamethizole, 85.5, (0.9); Sulfamethoxazole, 112.4, (0.2); Sulfanilamide, 56.5, (6.0); Sulfathiazole, 138, (0.6)
Macrolides	Virginiamycin, 89.5, (4.2), 5.29	Azithromycin, 97.7, (0.7); Clarithromycin, 96.4, (0.6); Erythromycin-H2O, 117, (0.9); Lincomycin, 129.5, (1.2); Roxithromycin, 75.1, (0.1); Tylosin, 72.1, (2.4);
Quinolones	-	Ciprofloxacin, 99.6, (2.); Clinafloxacin, 119, (2.6); Enrofloxacin, 119, (1.2); Flumequine, 104.7, (0.6); Lomefloxacin, 72.7, (1.2); Norfloxacin, 114, (6.); Ofloxacin, 81.8, (0.6); Oxolinic Acid, 54.8, (0.3); Sarafloxacin, 65.7, (0.6)
Penicillins	-	Cloxacillin, 86, (1.2); Oxacillin, 87.7, (1.2); Penicillin G, 28.3, (1.2); Penicillin V, 120.5, (1.2)
Cephalosporin	-	Cefotaxime, 65.1, (9.9)
Other	Ormetoprim, 93.1, (0.4), 0.510	Carbadox, 24.7, (0.6); Trimethoprim, 91.5, (0.6)

Superscripts of detected concentrations indicate sample number; see Table 1 for additional sample information.

^*Highest method detection limit (MDL) for each analyte is reported. See Table S2 in the Supplemental Information for all MDLs.