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Table 3 Evaluation of commercial monensin standards used routinely in feed mills

From: Chemical assessment of mycotoxin contaminants and veterinary residues in Costa Rican animal feed

Sample Guaranteed analysis, g/100 g Experimental resulta, Concentration ± Ux/x g/100 g Variation, g/100 g (percentileb)
1 20 17.04 ± 0.98 −2.96 (14.8)
2 20 22.26 ± 1.28 2.26 (11.3)
3 7 8.39 ± 0.48 1.39 (19.9)
4 0.2 0.15 ± 0.04 −0.05 (21.1)
  1. aMonensin standard (M5273 lot 117 K5006) used for quantification, 91% purity as reported by the manufacturer. Work solution concentration, ca. 10 mg L−1
  2. bCalculated as the subtraction between the experimental value and guaranteed value divided by the guaranteed value