Establishment of Pre-Harvest Residue Limit (PHRL) of Methoxyfenozide and Novaluron on Peaches

Cho, Kyung-Won; Park, Jaehun; Kim, Jiwon; Yoon, Ji-Yeong; Moon, Hye-Ree; Lee, Kyu-Seung

doi:10.7585/kjps.2013.17.1.6

Cited by 5 publications

(2 citation statements)

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“…Besides, t 1/2 varies with the type of plant as well. The t 1/2 of methoxyfenozide in cauliflower is similar to that in Chinese cabbage 11 but shorter than that in peaches 12 and grape. 13 In the present study, the t 1/2 in tea shoots (1.2 days) is shorter than that in cauliflower (2.5-3.5 days), though the initial residue in tea shoots (12.9 mg kg −1 ) is much higher than that in cauliflower (0.14-4.38 mg kg −1 ).…”

Section: Discussionmentioning

confidence: 54%

“…Lee et al 11 studied the residual characteristic of methoxyfenozide and found that its half-life in Chinese cabbage was 3.5 days. Cho et al 12 reported that the half-life of methoxyfenozide in peaches was 4.4 days at single treatment and 4.2 days at triple treatment. Kim et al 13 revealed that the half-life of methoxyfenozide was 5.1-6.1 days in grape.…”

Section: Introductionmentioning

confidence: 99%

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Residue dissipation and dietary exposure risk assessment of methoxyfenozide in cauliflower and tea via modified QuEChERS using UPLC/MS/MS

et al. 2020

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BACKGROUND Methoxyfenozide possesses efficacy against a variety of lepidopteron pests, including the major pests in cauliflower and tea, so it is of great importance to generalize the practical use of methoxyfenozide in the field. RESULTS An efficient method was developed and validated in both vegetable matrix and extract‐rich matrix (cauliflower and tea) using modified QuEChERS combined with UPLC/MS/MS analysis. The recoveries in cauliflower, made tea and tea shoots ranged from 94.5 to 108.0%, from 85.0 to 91.6% and from 77.3 to 82.0% respectively, with relative standard deviations (RSDs) below 17.3% in all cases. The field results showed that methoxyfenozide dissipated in cauliflower with half‐life (t1/2) at 2.5–3.5 days and in tea with t1/2 at 1.2 days. Combining the above experimental data and statistical food intake values, the risk quotient (RQ) values were significantly lower than 1. CONCLUSION The quantification method of methoxyfenozide in cauliflower or tea has not been established until this study. The dissipation and dietary exposure risk assessment of methoxyfenozide in cauliflower and tea were investigated in the field. Methoxyfenozide dissipated rapidly in cauliflower despite different climates, and it dissipated faster in tea. The dietary risk of methoxyfenozide through cauliflower or tea was negligible to humans. This study not only provides guidance for the safe use of methoxyfenozide but also serves as a reference for the establishment of maximum residue limits (MRLs) in China. © 2019 Society of Chemical Industry

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Section: Discussionmentioning

confidence: 54%

Section: Introductionmentioning

confidence: 99%

Residue dissipation and dietary exposure risk assessment of methoxyfenozide in cauliflower and tea via modified QuEChERS using UPLC/MS/MS

et al. 2020

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Assessment of Pre-Harvest Environmental Factors in Domestic Production of Organic Lettuce

Namgung¹,

Kim²,

Heo

et al. 2014

The Korean Journal of Pesticide Science

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Among pre-harvest environmental factors, increasing attention has been paid to the effects of chemical and microbiological factors on fresh produce. The occurrence and prevalence of these factors have been usually studied with regard to the final products at the post-harvesting stage and/or when they are sold in the market. However, the origin and routes of transmission of both factors remain to be clarified. In the present study, we examined the contamination levels of food-borne pathogens and chemical factors such as pesticide residues and heavy metals in 83 and 43 samples, respectively, including various soil, water, and fertilizer samples, as well as post-harvested and processed samples. Among the organic farming samples, only one pesticide, dimethomorph, was detected in the soil sample, however no pesticides were observed from any other samples in organic farming system. Thus, it was thought that might be contaminated from conventional farm land in the vicinity. Whereas many pesticide residues were detected in conventional farming systems such as soil, fertilizer, water, and fresh produce as expected. Furthermore, heavy metals detected from all tested samples did not shown contamination levels higher than the standard limit. We comparatively assessed the levels of contamination by food-borne pathogens on the samples from organic and conventional farming systems, and found aerobic bacteria at approximately 7 log CFU/g, with no significant differences observed between the two systems. Coliforms were present at lower levels than aerobic bacteria. No human pathogens were present among the coliforms detected, indicating that these bacteria are saprophytes without the ability to cause food-borne illnesses. In contrast, among the high-risk food-borne pathogens, only sporadic cells of Bacillus cereus were found on samples of organic farming system. These data extend previous findings that the most prevalent food-borne pathogen is B. cereus and demonstrate that it spreads to whole living plants via soil.

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Establishment of Pre-Harvest Residue Limit for Buprofezin and Penthiopyrad during Cultivation of Oriental melon (Cucumis melon var. makuwa)

Kim¹,

Kim²,

Choi

et al. 2014

The Korean Journal of Pesticide Science

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The present work was aimed to determine the pre-harvest residue limits (PHRLs) and the safety management of commonly used pesticides namely buprofezin and penthiopyrad on oriental melon (Cucumis melon var. makuwa). In this study, the buprofezin (diluted two thousand fold) and penthiopyrad (diluted four thousand fold) were sprayed single time on oriental melon in the cultivation areas Sangju (site 1) and Sungju (site 2). Oriental melon were randomly collected from the both areas at the end of 0 (2 hours after pesticides spaying), 1, 2, 3, 5, 7, 9 and 10 days. For analysis, each samples were partitioned twice (80 and 70 mL) with dichloromethane and purified by florisil SPE cartridge. Finally, the residual amounts of both pesticides in all samples were analyzed using gas chromatography/nitrogen phosphorus detector (GC/NPD). In this study, the method limit of quantification (MLOQ) for both buprofezin and penthiopyrad in oriental melon was found to be 0.01 mg kg −1 and their recovery levels were 91.1~98.6% and 90.0~104.6%, respectively. Further, the calculated biological half-life for buprofezin and penthiopyrad in oriental melon were 3.9 and 3.5, and 3.0 and 2.7 days in site 1 and 2, respectively. The results of this study found that the PHRLs for buprofezin and penthiopyrad were 4.24 and 2.31 mg kg −1 , respectively at 10 days before harvest. Consequently, the present study suggest that the residual amounts of both pesticides will be lower than the maximum residue limits (MRLs) when oriental melon is harvested.

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Establishment of Pre-Harvest Residue Limit (PHRL) of Methoxyfenozide and Novaluron on Peaches

Cited by 5 publications

References 1 publication

Residue dissipation and dietary exposure risk assessment of methoxyfenozide in cauliflower and tea via modified QuEChERS using UPLC/MS/MS

Residue dissipation and dietary exposure risk assessment of methoxyfenozide in cauliflower and tea via modified QuEChERS using UPLC/MS/MS

Assessment of Pre-Harvest Environmental Factors in Domestic Production of Organic Lettuce

Establishment of Pre-Harvest Residue Limit for Buprofezin and Penthiopyrad during Cultivation of Oriental melon (Cucumis melon var. makuwa)

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