Persistence and effect of processing on reduction of fipronil and its metabolites in chilli pepper (Capsicum annum L.) fruits

Abstract

A single laboratory UPLC-MS/MS method was developed and validated for the estimation of fipronil and its metabolites in fresh and dry chilli pepper fruits. Dissipation of fipronil on chilli fruits was studied following the application of fipronil (Jump 80 WG) at 40 and 80 g active ingredient (a.i.) ha(-1) in the fruiting stage of the crop. The initial deposits of total fipronil on fresh chilli fruits at single and double dose application were 0.69 and 1.43 μg g(-1), respectively, and were dissipated to below quantitation level at 27 days after application. The half-life of fipronil at single and double dose in fresh chilli pepper was 4.22 and 4.32 days and the waiting period was 25.9 and 30.6 days, respectively. Processing factor due to sun drying was calculated by measuring fipronil residues in dry chilli fruits, and it ranged from 2.96 to 3.50 during 0 to 21st day after application. Among the metabolites of fipronil, fipronil desulfenyl and fipronil sulfone had maximum residues in fresh and dried chilli, respectively, followed by fipronil sulfide. Dipping in solutions of tamarind, turmeric, vinegar and slaked lime and wet scrubbing could remove more than 90% of fipronil residues in fruits.

Dissipation of some Pesticide Residues in Tomato (Lucopersicon esculentum L.) Fruits Using QuECHERS Methodology under the Egyptian Field Conditions

“…Similar results were found by (Xavier et al, 2014) who determined the dissipation of fipronil on chili fruits after the spraying at double and single dose. The half-life time of fipronil at double and single dose in fresh chili pepper was 4.32 and 4.22 days and the waiting periods were 30.6 and 25.9 days, respectively.…”

Dissipation behavior of octachlorodipropyl ether residues during tea planting and brewing process

“…The following are factors affecting pesticide’s persistence in crops: the physical and chemical properties of the pesticide (chemical stability, water solubility, and volatility), the environmental factors (light, temperature, pH, and moisture) and the crop characteristics, such as the growth dilution factor (Liu et al 2014; Xavier et al 2014; Jacobsen et al 2015). The physical and chemical properties of the pesticide might have played a basic role in the degradation of the insecticides.…”

Exposure to fipronil elevates systolic blood pressure and disturbs related biomarkers in plasma of rats

“…(2012) and adapted from Xavier et al (2014). Briefly, blood samples were subjected to extraction by stirring with acetonitrile (Merck, Germany) and the filtered material was evaporated at room temperature and re-suspended with acetonitrile, then, passed with hydrophilic syringe filter with 13 mm diameter and pore 0.22 m (PTFE membrane, VWR, Atlanta, GA, USA).…”