Dissipation behavior, residue distribution, and dietary risk assessment of fluopimomide and dimethomorph in taro using HPLC-MS/MS

The demand for Chinese chives is growing as they are also rich in vitamins, fiber, and sulfur nutrients. Chinese chives should be sprayed with imidacloprid to control pests and diseases to safeguard their yield and to meet the demands of East Asian consumers for Chinese chives. Overspraying of imidacloprid can lead to residues in Chinese chives, posing a severe risk to human health. To reduce the harmful effects of imidacloprid residues on humans, we investigated the imidacloprid dissipation pattern and the final residue on Chinese chives using the quick, easy, cheap, effective, rugged, and safe (QuEChERS) method combined with liquid chromatography-tandem mass spectrometry (LC-MS/MS). Good linearity (R2= 0.9988), accuracy (expressed as recovery % of 78.34–91.17%), precision [expressed as relative SDs (RSDs) of 0.48–6.43%], and sensitivity [a limit of quantification (LOQ) ≤ 8.07 × 104 mg/kg] were achieved. The dissipation dynamics were consistent with the first-order kinetics, with a half-life of 2.92 days. The final residual levels on Chinese chives were 0.00923–0.166 mg/kg, which is lower than the maximum residue limits (MRLs) of 1 mg/kg for imidacloprid on Chinese chives. A risk assessment index of <1 indicates that Chinese chives are safe for consumption.

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“…We assessed the risk of imidacloprid in Chinese chives using a chronic dietary risk quotient (RQc) based on a risk factor approach ( 17 ).…”

Section: Methodsmentioning

confidence: 99%

Residue, Dissipation Pattern, and Dietary Risk Assessment of Imidacloprid in Chinese Chives

et al. 2022

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“…The calculated MEs using Equation (1) were −13% for SeCys 2 , 8% for MeSeCys, and 9% for SeMet. These MEs were between −20% and 20%, indicating that there was no matrix effect [20]. In addition, the values of spike recovery were tested by F-test.…”

Section: Analytical Performance Of the Methodsmentioning

confidence: 99%

“…When ME is between 20 and 50% or between −50 and −20%, there is a medium matrix effect, while a strong matrix effect is less than −50% or more than 50%. Positive and negative values mean signal enhancement and suppressions induced by matrix, respectively [20].…”

Section: Matrix Effectmentioning

confidence: 99%

Determination of Selenomethionine, Selenocystine, and Methylselenocysteine in Egg Sample by High Performance Liquid Chromatography—Inductively Coupled Plasma Mass Spectrometry

et al. 2022

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The deficiency of selenium in dietary is recognized as a global problem. Eggs, as one of the most widely consumed food products, were readily enriched with selenium and became an important intake source of selenium for humans. In order to better understand the speciation and bioaccessibility of selenium in eggs, a simple and reliable approach that could be easily used in a routine laboratory was attempted to develop for analyzing selenium species. Three of organic selenium species (selenocystine, methylselenocysteine, and selenomethionine) in liquid whole egg were completely released by enzymatic hydrolysis and detected by high performance liquid chromatography in combination with inductively coupled plasma mass spectrometry (HPLC-ICP-MS). All the parameters in enzymatic hydrolysis and separation procedures were optimized. The effect of matrix in analysis was critically evaluated by standard addition calibrations and external calibrations. Under the optimal conditions, the spike recoveries of selenium species at 0.1–0.4 μg g−1 spike levels all exceeded 80%. This method was successfully applied to the determination of selenium species in fresh egg and cooked eggs.

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“…Dimethomorph (DMM) is widely used to control downy mildew in cucurbitaceous crops 15 . Its function is to destroy the formation of the cell wall membrane, cause the decomposition of the sporangium wall, and induce the death of pathogenic bacteria 16 . Despite its beneficial effects in disease control, DMM shows toxicity to a wide range of organisms, including soil and water microbial communities, while showing moderate toxicity to fish and invertebrates and exhibiting sublethal effects 17–19 .…”

Section: Introductionmentioning

confidence: 99%

“…15 Its function is to destroy the formation of the cell wall membrane, cause the decomposition of the sporangium wall, and induce the death of pathogenic bacteria. 16 Despite its beneficial effects in disease control, DMM shows toxicity to a wide range of organisms, including soil and water microbial communities, while showing moderate toxicity to fish and invertebrates and exhibiting sublethal effects. [17][18][19] Frequent and heavy use of pesticides increases chemical residues in vegetables and endangers human health.…”

Section: Introductionmentioning

confidence: 99%

A pH‐ and redox‐stimulated responsive hollow mesoporous silica for triggered delivery of fungicides to control downy mildew of Luffa cylindrica

Yang

Chen

Yan

et al. 2022

Pest Management Science

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BACKGROUND: Downy mildew, a devastating disease of cucurbitaceous crops caused by Pseudoperonospora cubensis. Although a variety of fungicides are used to control downy mildew, choosing an effective product can be challenging. Environmental stimulus-responsive pesticide delivery systems have great potential to improve the effectiveness of disease and pest control and reduce the impact on environmentally beneficial organisms. RESULTS: In this work, a disulfide bond (SS)-modified and chitosan oligosaccharide (COS)-capped hollow mesoporous silica (HMS) pesticide delivery system was synthesized using a hard template method for the control of downy mildew in cucurbit crops. The synthesized nanoparticles were loaded with dimethomorph (DMM)

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Dissipation behavior, residue distribution, and dietary risk assessment of fluopimomide and dimethomorph in taro using HPLC-MS/MS

Cited by 13 publications

References 18 publications

Residue, Dissipation Pattern, and Dietary Risk Assessment of Imidacloprid in Chinese Chives

Residue, Dissipation Pattern, and Dietary Risk Assessment of Imidacloprid in Chinese Chives

Determination of Selenomethionine, Selenocystine, and Methylselenocysteine in Egg Sample by High Performance Liquid Chromatography—Inductively Coupled Plasma Mass Spectrometry

A pH‐ and redox‐stimulated responsive hollow mesoporous silica for triggered delivery of fungicides to control downy mildew of Luffa cylindrica

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