Abstract:

A method for determining flufiprole residues in brown rice and rice husk was proposed by gas chromatography
(GC). The flufiprole residues in samples were extracted with aqueous acetonitrile, cleaned up on a Florisil column, separated
using gas chromatography equipped with a DB-1MS capillary column and detected with an electron capture detector.
An excellent linear relationship between flufiprole concentration (x) in the range of 0.01–0.2 mg/L and peak area (y) was
achieved. The linear equation was y = 1 × 106x ＋ 3677.6, with a coefficient of determination of was 0.9958. For brown
rice, the mean recoveries of the method varied from 84.2% to 104.1% with a relative standard deviation ranging from 5.2%
to 12.7% at three spiked levels of 0.01, 0.02 mg/kg and 0.1 mg/kg. For rice husk, the mean recoveries varied from 89.7%
to 97.3% with a relative standard deviation ranging from 4.3% to 15.5% at three spiked levels of 0.01, 0.02 mg/kg and 0.1 mg/kg.
The limit of detection for both brown rice and rice husk was 0.01 mg/kg. This method is simple, rapid, sensitive, and can be
used for the determination of flufiprole residues in brown rice and rice husk.

Key words: flufiprole, residue, gas chromatography (GC), brown rice, rice husk