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Table 5 Repeatability study at MRL, 0.5 MRL or concentration < 0.5 MRL

From: Primary validation of Charm II tests for the detection of antimicrobial residues in a range of aquaculture fish

Family

Compound

Spiking concentration (µg/kg)

Mean cpm

SDr

RSDr (%)

Tetracyclines

Chlortetracycline

25 µg/kg (0.25 MRL)

1207.0

118.2

9.8

Oxytetracycline

100 µg/kg (MRL)

1270.06

98.41

7.75

Macrolides

Erythromycin A

100 µg/kg (0.5 MRL)

1762.4

110.4

6.3

200 µg/kg (MRL)

1478.1

41.2

2.8

β-Lactams

Penicillin G

25 µg/kg (0.5 MRL)

1285.6

89.3

6.9

50 µg/kg (MRL)

648.5

62.7

9.7

Aminoglycosides

Streptomycin

250 µg/kg (0.5 MRL)

1125.8

112.7

10.01

500 µg/kg (MRL)

1110.5

127.2

11.5

Sulfonamides

Sulfathiazole

25 µg/kg (0.25 MRL)

922.2

80.1

8.7

100 µg/kg (MRL)

706.5

8.6

1.2

  1. SDr, standard deviation under repeatability conditions, RSDr, relative standard deviation under repeatability conditions, Mean cpm average of counts per minute under reproducibility conditions