FOOD CHEMISTRY
·
2022
·
IF 9.231
Changjian Li,Kexin Chi,Hang Yu,Yahui Guo,Weirong Ya,He Qian
Dissipation of an organophosphorus pesticide, trichlorfon, in natural and waxed apples during storage was studied. The results showed that the trichlorfon content in natural and waxed apples decreased by 85% and 64%, respectively, during storage. The morphology of the surface film was dense and regular, which resulted in a higher water vapor resistance and a lower respiration rate in the waxed apples. This indicates that waxing affected the dissipation of pesticide residues in the apple storage environment, increasing food safety risk. Ozone was used to remove the residual pesticides on the apple surface. The trichlorfon degradation rate reached 73%. The ozone treatment had no effect on the surface color of the apple, which means that the fruit can be pre-treated with ozone prior to waxing or storage.
研究领域:
食品安全
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植物保护
·
环境科学
✓ 已验证
DOI
PubMed
高影响因子
Analytical Methods
·
2016
·Vol. 8
·期 15
·3196-3203
·
IF 1.915
Jing-Nie,Yang-Guang Wang,Li-Ye Yang,Wei-Jian Wu,Di Yu,Xiao-kun OuYang
In this study, the dissipation and enantioselective degradation of trichlorfon (TF) enantiomers in mariculture pond water was investigated under various conditions using a chiral HPLC method. The results showed that the TF enantiomers dissipated following first-order kinetics in the mariculture pond water under natural, dark, sterile, and dark and sterile conditions. S-(+)-TF degraded more rapidly than R-(−)-TF under natural and dark conditions, whereas the dissipation of TF enantiomers in mariculture pond water was non-enantioselective under sterile, and dark and sterile conditions. Light and microbial activity played important roles in the dissipation of the TF enantiomers in mariculture pond water, and the TF enantiomers degraded faster at higher temperatures. Microbial activity was found to be responsible for the enantioselectivity under these conditions. The results of the study can be used to evaluate the environmental risk of TF at the enantiomer level.
研究领域:
环境科学
·
毒理学
✓ 已验证
DOI
高影响因子
ANALYTICA CHIMICA ACTA
·
2025
·
IF 6
Songrui Li,Fubin Yang,Junying Li,Yongcun Zou,Qiong Jia
Background As a common organophosphorus pesticide, trichlorfon (TC) is being extensively used in agriculture due to its high efficiency in plant diseases and insect pest control. However, TC should be monitored in a timely manner due to its severe threat to public health. Currently reported fluorescence methods for TC detection largely depend on enzyme inhibition effect, which suffers from their intrinsic defects such as poor selectivity, complexity, or high cost. Hence, it is of essential value to develop a facile and low-cost fluorescence approach to achieve specific enzyme-free detection of TC. Results In this work, L-cysteine protected copper nanoclusters (CuNCs) with good stability were prepared as the fluorescence sensing probe. Under alkaline conditions, TC tends to be hydrolyzed to produce dichloroacetaldehyde, which was directly employed as an effective reducing agent to in-situ synthesize silver nanoparticles (AgNPs). The fluorescence of L-cys-CuNCs was quenched by AgNPs through the inner filter effect (IFE), realizing specific enzyme-free determination of TC. Besides, portable and visual detection of TC was achieved depending on a smartphone sensing platform. This method was further employed to monitor TC in cherry tomatoes, potatoes, and cultivated soil samples with satisfying results, illustrating its high potential in monitoring TC in real samples. Overall, this method possesses the attractive superiorities of simplicity, cost efficiency, and specificity for the detection of TC. Significance The strategy has the following advantages. (i) Specific enzyme-free detection of TC was achieved based on CuNCs/AgNPs fluorescent platform. (ii) AgNPs, as CuNCs fluorescence quencher, was directly in-situ synthesized using the hydrolysis products of TC, which avoids adding extra reducing agent and provides a possibility for the waste utilization of TC. (iii) A portable and low-cost smartphone sensing platform was constructed for visually specific determination of TC.
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
PEDOSPHERE
·
2023
·
IF 5.7
Hongfeng CHEN,Zhouyang HE,Mingxia HOU,Cilai TANG,Yonghong WU
ABSTRACT The effect of low molecular weight organic acids on the adsorption behaviour of trichlorphon on phyllosilicate minerals was investigated by the combination of adsorption measurements and molecular spectroscopic technique (Attenuated total reflection-fourier transform infrared spectroscopy (ATR-FTIR) and X-ray Photoelectron Spectroscopy (XPS)). The adsorption of trichlorphon on kaolinite (KAO) and montmorillonite (MON) was suppressed by increasing pH, indicating electrostatic interaction was the key role in the adsorption especially at low pH. In the presence of citric acid (CA), there was obvious promotion of the adsorption of trichlorphon on KAO and MON. In the presence of oxalic acid (OA), the adsorption on KAO was also promoted, while the adsorption on MON was inhibited especially at pH 4.0. The presence of CA and OA increased the adsorption by increasing the exposure of hydrophobic sites of KAO and MON. The ATR-FTIR and XPS results also indicated that the hydrophobic Si-O sites of phyllosilicate minerals were the preferred adsorption sites of trichlorphon in the presence of CA and OA and probably was driven by the hydrophobic effect. However, the weak effect of OA on MON caused the increasing of electrostatic repulsion between MON and trichlorphon molecule and thus inhibited the adsorption. This study has great significance for deeper understanding of the self-purification of soil and sediment systems in the presence of organic pollutants.
研究领域:
环境科学
·
土壤学
✓ 已验证
产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）