Simultaneous determination of two plant growth regulators in ten food samples using ion chromatography combined with QuEChERS extraction method (IC-QuEChERS) and coupled with fluorescence detector

A new simple, isocratic, selective and highly sensitive method has been developed for the simultaneous separation and determination of two plant growth regulators (PGRs): 2-(1-Naphthyl) acetic acid (NAA) and 2(Naphthalen-1-yl) acetamide (NAD). Both PGRs were extracted by modified and miniaturized ion chromatography-Quick, Easy, Cheap, Effective, Rugged and Safe (IC-QuEChERS) method from ten food samples. The separation and sensitive determination were carried out by using ion chromatography coupled with fluorescence and ultraviolet (IC-FLD/UV) detector. The proposed analytical and extraction methods were validated by using blank samples, fortified with a standard solution of these two PGRs at three concentration levels 5, 15 and 25 mu g/ kg. The method showed good linearity (r(2) = 0.980), satisfactory recoveries (76.3-112) with tolerable precision having relative standard deviations less than 15.4% (RSDs, n = 3). The limit of detection and limit of quantification were also in the range of 0.08-6.6 ng/kg and 2.2-20 ng/kg, respectively.