Determination of benzoylureas in tomato by high-performance liquid chromatography using continuous on-line post-elution photoirradiation with fluorescence detection

Coupled‐column liquid chromatography method with photochemically induced derivatization for the direct determination of benzoylureas in vegetables

“…In all cases, these LODs and LOQs were significantly lower than those reported by other techniques without column switching mode, such as GC-ECD [37], LC-UV [18,20,21] or PIF [38,39] and are in the same order as those obtained by LC-PIF-FD [22] and LC-MS [23][24][25], using a SPE step in all cases.…”

“…Benzoylurea residues are generally analyzed by LC using UV [18][19][20][21], FD [22], or MS detection [23][24][25]. Because of their high polarity and poor detectability using any kind of detector, these methodologies require considerable effort in sample preparation steps such as extraction, concentration, and clean-up techniques.…”

“…In a previous study [22], we developed a new methodology with LC linked to photochemically induced fluorescence (PIF) with post-column derivatization to determine benzoylurea insecticides in vegetable samples. The photodegradation mechanism certainly involves a modification of the aromatic moiety but is probably complex and therefore further investigation is necessary to characterize the structure of the photoproduct(s).…”

Determination of benzoylurea insecticides in food by pressurized liquid extraction and LC‐MS

“…Their greatest value is the control of caterpillars and beetle larvae [6][7][8][9]. Although these pesticides show a low toxicity for mammals because the chitin is absent in plants and in vertebrates, their residues can often reach populations through the food chain causing chronic exposure and long-term toxicity effects [10][11][12].…”

Solid‐phase microextraction for the determination of benzoylureas in orange juice using liquid chromatography combined with post‐column photochemically induced fluorimetry derivatization and fluorescence detection

“…It was recently demonstrated that UV irradiation yields photochemical reactions in several classes of pesticides, whose photochemistry has been reviewed by Crosby [9] and Marcheterre [10], and more recently by Aaron [6]. BU insecticides are a group of non-fluorescent pesticides, which may be converted into fluorescent species by photochemical reactions [11,12]. With respect to their photochemistry, only diflubenzuron has been studied by Coly et al [6,13], among several aromatic insecticides.…”