Table 5: Recovery rates of four pesticides in the spiked blank yacon samples when molecularly imprinted nanomicrospheres were used for extracting pesticides and results of actual samples (mean ± SD, ).

PesticidesSamples (ng·g−1)Spiked level = 0.5 ng·g−1Spiked level = 2.5 ng·g−1
YaconDetected content Recovery (%)/RSD (%)Detected contentRecovery (%)/RSD (%)

PhoximN.D0.447 ± 0.02589.4/(5.6)2.38 ± 0.2295.2/(9.2)
Tolclofos-methyl0.470.427 ± 0.02185.4/(4.9)2.31 ± 0.1992.4/(8.2)
Chlorpyrifos1.260.486 ± 0.02497.2/(4.9)2.28 ± 0.1491.2/(6.1)
Parathion-methylN.D0.506 ± 0.031101.2/(6.1)2.36 ± 0.1694.4/(6.8)

N.D: no detection; RSD: relative standard deviation.