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Table 1 Analytical characteristics of the IL-DLLME method combined with HPLC–UV analysis

From: One-step ionic liquid-based ultrasound-assisted dispersive liquid–liquid microextraction coupled with high-performance liquid chromatography for the determination of pyrethroids in traditional Chinese medicine oral liquid preparations

Samples Analytes Linearity equation R2 Linear range (mg L−1) LOD (mg L−1) LOQ (mg L−1) Enrichment factor Extraction recovery (%) Precision (% RSD)
Intra-day (n = 5) Inter-day (n = 5)
Simotang oral liquid Beta-cyfluthrin y = 124,226.43x + 7577.64 0.9999 0.1–10 0.019 0.067 99 82.8 0.8 0.7
Fenvalerate y = 114418x + 7708.3 0.9999 0.1–10 0.024 0.080 98 92.5 1.4 2.5
Tau-fluvalinate y = 144216x + 9161 0.9999 0.1–10 0.011 0.037 103 91.2 3.0 3.5
Bifenthrin y = 167,084.12x + 8753.71 0.9999 0.1–10 0.010 0.033 114 91.8 0.8 1.2
Kangbingdu oral liquid Beta-cyfluthrin y = 111083x + 7169.3 0.9993 0.1–10 0.012 0.040 120 96.1 1.3 3.1
Fenvalerate y = 106583x + 5899.6 0.9993 0.1–10 0.016 0.053 112 89.2 2.9 2.1
Tau-fluvalinate y = 138510x + 16,352 0.9991 0.1–10 0.008 0.027 102 81.1 2.0 0.9
Bifenthrin y = 168772x + 7222 0.9999 0.1–10 0.007 0.023 102 81.0 1.7 2.3
Huaji oral liquid Beta-cyfluthrin y = 121491x + 16,306 0.9998 0.1–10 0.019 0.067 131 85.1 1.2 3.1
Fenvalerate y = 114327x + 5899.6 0.9999 0.1–10 0.021 0.070 129 83.8 2.9 3.9
Tau-fluvalinate y = 140657x − 14,435 0.9999 0.1–10 0.009 0.030 136 88.3 2.0 2.2
Bifenthrin y = 158771x + 14,879 0.9997 0.1–10 0.011 0.036 150 97.7 1.7 1.4