Table 2.
Consistency and Comparison between dr-ICGA and LC-MS/MS for the Determination of Phenamacril in Wheat Floura
| sample types | sample sources | sample no. | spiked level (mg/kg) | LC-MS/MS (n = 3) | dr-ICGA (n = 5) | ||
|---|---|---|---|---|---|---|---|
| detected concentration (μg/kg) | recovery (%) | CV (%) | close up to left visual result (dilute 10 times) | ||||
| spiked positive samples | Hema supermarket | 1 | 0 | 00 | ND | ND | −, −, −, −, −, |
| 1–1 | 0.0125 | 1.02 | 81.60 | 9.66 | −, −, −, −, −, | ||
| 1–2 | 0.025 | 2.28 | 91.20 | 6.64 | −, ± , −, ± , −, | ||
| 1–3 | 0.05 | 4.68 | 93.60 | 7.77 | ±, ± , ± , ± , ± , | ||
| 1–4 | 0.1 | 985 | 98.50 | 3.99 | ±, + , + , + , + , | ||
| 1–5 | 0.2 | 19.67 | 9835 | 1 95 | +, + , + , + , + , | ||
| blinded samples | Hema supermarket | 1 | ND | ND | ND | −, −, −, −, −, | |
| 2 | ND | ND | ND | −, −, −, −, −, | |||
| 3 | ND | ND | ND | −, −, −, −, −, | |||
| Suguo supermarket | 4 | ND | ND | ND | −, −, −, −, −, | ||
| 5 | ND | ND | ND | −, −, −, −, −, | |||
| 6 | ND | ND | ND | −, −, −, −, −, | |||
| local market | 7 | ND | ND | ND | −, −, −, −, −, | ||
| 8 | ND | ND | ND | −, −, −, −, −, | |||
| 9 | ND | ND | ND | −, −, −, −, −, | |||
a
−, negative: the concentration of phenamacril in wheat flour is <0.05 mg/kg; ±, weakly positive: the concentration of phenamacril in wheat flour is 0.05–0.1 mg/kg; +, positive: the concentration of phenamacril in wheat flour is > 0.1 mg/kg; ND, none detected.