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In your response to my comments you have written "We defined LOD as the lowest drug concentration in the samples can be measured with a signal to the background signal (S/N) ratio of 3/1(S/N), and LOD as the lowest drug concentration in food samples can be measured with a signal to the background signal (S/N) ratio of 10/1(S/N). After the detection, we found that the LOD was 5 g/kg and the LOQ was 10 g/kg."  If 5 µg/kg gives a signal ise ratio of 3/1, 10 µg/kg cannot give a signal ise ratio of 10/1 (it would give just a signal ise ratio of 6/1) !!! Either your value for the LOD or your value for the LOQ is wrong.
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