Dinotefuran Residues and their Dissipation in Chilli Pepper (Capsicum annuum L.) and Soil and their Risk Assessment

Kumar, S Visal; Subhashchandran, KP; George, Thomas; Paul, Ambily; Xavier, George; Vijayasree, V.; Suryamol, S

doi:10.5958/2249-524x.2019.00032.3

Cited by 7 publications

(3 citation statements)

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“…The half-life ranged from 32 to 41 days, indicating that it remained for a relatively long time when compared to the other test pesticides. Dinotefuran presented a half-life of 1.4-3.1 days and 2.1-2.6 days for Chinese matrimony vine and chili peppers, respectively [19,23], which is much shorter than persimmon, the material used in this study. This can be attributed to the fact that Chinese matrimony vine and red chili peppers present a clear change in the weight due to growth during the pesticide spraying period, but in the case of persimmons, there is minimal change in the weight because the pulp only exhibits ripening rather than growth during the pesticide spraying period.…”

Section: Dissipation Pattern Of Test Pesticide In Fresh Persimmonmentioning

confidence: 85%

Dissipation and Residue Pattern of Dinotefuran, Fluazinam, Indoxacarb, and Thiacloprid in Fresh and Processed Persimmon Using LC-MS/MS

Noh¹,

Shin

et al. 2022

Foods

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Pesticides which are diluted and sprayed according to the pre-harvest interval (PHI) are generally decomposed and lost through various factors and pathways, and the leftover pesticides are known as residual pesticides. This study aims to determine the dissipation of residual amounts of dinotefuran, fluazinam, indoxacarb, and thiacloprid in persimmon and the changes in the concentration of various processing products. Pesticide spraying is performed in accordance with the GAP (good agricultue practice) of Korea, and the processed products are manufactured using a conventional method after removing the skin of persimmons. The modified QuEchERS (Quick, Easy, Cheap, Effective, Rugged, and Safe) method and an optimized method using LC-MS/MS (liquid chromatography mass spectrometry) is implemented to analyze the residual pesticides. The linearity, recovery, and LOQ (limit of quantitation) are presented to verify the analysis method. The amount of residual pesticides tested decreases significantly in a time-dependent manner, regardless of the minimal dilution effect present due to growth. The residual concentration does not vary significantly during the processing stage despite the removal of the systemic pesticides, dinotefuran and thiacloprid. The residues of non-systemic pesticides, fluazinam and indoxacarb, are typically removed by the peeling removal and processing methods. The reduction factor of dinotefuran, whose residual concentration is increased, is less than 1, and the absolute amount of pesticides is decreased through processing. The results of this study can be used as the scientific basis data to ensure the safety of residual pesticides in processed products in the future.

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Section: Dissipation Pattern Of Test Pesticide In Fresh Persimmonmentioning

confidence: 85%

Dissipation and Residue Pattern of Dinotefuran, Fluazinam, Indoxacarb, and Thiacloprid in Fresh and Processed Persimmon Using LC-MS/MS

Noh¹,

Shin

et al. 2022

Foods

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“…The uptake of total soil-residual dinotefuran by lettuce has recently demonstrated that about a 24–28% level of initial concentration was translocated into leaves 30 and 60 days after treatment [ 38 ]. This high uptake ratio was explained by high water solubility and lower sorption to soil organics [ 39 , 40 ]. Thus, the evaluation of soil-residual pesticide in leaf vegetables is important for pesticide safety in agricultural products.…”

Section: Discussionmentioning

confidence: 99%

Uptake of Soil-Residual Diazinon by Rotational Lettuce under Greenhouse Conditions

Yoon

Lim

Lee

et al. 2022

Foods

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Pesticide residue is an increasing concern in rotational crop practices. The pesticide used for the primary crop may re-enter the secondary crop, thus exceeding pesticide levels set by the positive list system (PLS). As such, evaluation of pesticide residue translocated into rotational crops is required for ensuring pesticide safety. In this study, we investigated the residue pattern of diazinon translocated into lettuce as a typical rotational crop in Korea. Diazinon was used to treat greenhouse soil at the maximum annual application rate before crop planting. Diazinon residues in soil and lettuce were investigated using liquid chromatography/tandem mass spectroscopy and a modified quick, easy, cheap, effective, rugged, safe (QuEChERS) method. The limit of quantitation (LOQ) of diazinon was found as 0.005 mg/kg for the plant and soil samples. The recovery of diazinon at the LOQ and 10× the LOQ ranged from 100.2% to 108.7%. The matrix calibration curve showed linearity, with R2 values > 0.998. Diazinon residue in soil dissipated over time after the initial treatment, generating first-order kinetics (R2 = 0.9534) and having a half-life of about 22 days. The uptake ratio (UTR) of diazinon from the soil to the plant ranged from 0.002 to 0.026 over the harvest period. Considering the UTRs, diazinon residue in the edible leaf could exceed the PLS level (0.01 mg/kg) if lettuce is rotated in soil containing >0.357 mg/kg of diazinon. Based on our findings, to comply with the PLS, a 3-month plant-back interval is required following diazinon treatment and/or setting the maximum residue limit of diazinon for lettuce.

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“…There have been many studies on the residue behaviors in various crops such as coffee beans, cucumber, eggplant, plum, melon, chilli pepper, wolfberry and rice. [9][10][11][12][13][14][15][16] Analytical methods for investigating dinotefuran and its metabolites in animalderived foods such as milk, egg and pork, as well as environmental samples including soil and water, were also developed using liquid chromatography tandem mass spectrometry (LC-MS/MS). 17 In the earlier study, dinotefuran and metabolites residue in green tea were analyzed by a slightly modified QuEChERS (i.e.…”

Section: Introductionmentioning

confidence: 99%

Residue behavior, transfer and risk assessment of tolfenpyrad, dinotefuran and its metabolites during tea growing and tea brewing

Bai

Chen

et al. 2021

J Sci Food Agric

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BACKGROUND: Tolfenpyrad and dinotefuran are two representative pesticides used for pest control in tea gardens. Their application may bring about a potential risk to the health of consumers. Therefore, it is essential to investigate the residue behavior, transfer and risk assessment of tolfenpyrad, dinotefuran and metabolites from tea garden to teacup.RESULTS: An effective analytical method was established and validated to simultaneously determine tolfenpyrad, dinotefuran and its metabolites (DN and UF) in tea. The average recoveries of tolfenpyrad, dinotefuran, DN and UF were in the range 72.1-106.3%, with relative standard deviations lower than 11.8%. On the basis of the proposed method, the dissipation of tolfenpyrad and dinotefuran in fresh tea leaves followed first-order kinetics models with half-lives of 4.30-7.33 days and 4.65-5.50 days, respectively. With application amounts of 112.5-168.75 g a.i. ha -1 once or twice, the terminal residues of tolfenpyrad and total dinotefuran in green tea were lower than 19.6 and 7.13 mg kg −1 , respectively, and below their corresponding maximum residue limits . The leaching rates of tolfenpyrad and total dinotefuran during the tea brewing were in the ranges 1.4-2.3% and 93.7-98.1%, respectively. CONCLUSION: Tolfenpyrad and dinotefuran in tea were easily degraded. The RQ c and RQ a values for tolfenpyrad were 37.6% and 5.4%, which were much higher than for dinotefuran at 24.7% and 0.84%, respectively. The data indicated that there was no significant health risk in tea for consumers at the recommended dosages. The results provide scientific data regarding the reasonable use of tolfenpyrad and dinotefuran aiming to ensure safe tea consuption.

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Dinotefuran Residues and their Dissipation in Chilli Pepper (Capsicum annuum L.) and Soil and their Risk Assessment

Cited by 7 publications

References 0 publications

Dissipation and Residue Pattern of Dinotefuran, Fluazinam, Indoxacarb, and Thiacloprid in Fresh and Processed Persimmon Using LC-MS/MS

Dissipation and Residue Pattern of Dinotefuran, Fluazinam, Indoxacarb, and Thiacloprid in Fresh and Processed Persimmon Using LC-MS/MS

Uptake of Soil-Residual Diazinon by Rotational Lettuce under Greenhouse Conditions

Residue behavior, transfer and risk assessment of tolfenpyrad, dinotefuran and its metabolites during tea growing and tea brewing

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