Method For Detection Of Residues Research Articles

Sensitive and rapid fluorescent detection of metronidazole based on stable light-emitting vinylene-linked covalent organic framework

Sensitive and rapid fluorescent detection of metronidazole based on stable light-emitting vinylene-linked covalent organic framework

Rapid on-site detection of imazaquin residue in corn and soybeans using an immunochromatographic assay.

Imazaquin (IMQ) is an imidazolinone group herbicide widely used for weed control around the world. Due to excessive use during crop production, IMQ can accumulate in corn and soybeans, positing a potential threat to human health. In this study, a hapten that had high specificity and sensitivity was designed using computer-simulated technology. A monoclonal antibody (mAb) was synthesized with a half inhibitory concentration of 0.98 ng mL-1. The mAb was incorporated into an immunochromatographic assay (ICA) for the detection of IMQ in corn and soybeans. The visual limit of detection was 10 μg kg-1 in corn with a linear range of 3.85-208.26 μg kg-1 and 5 μg kg-1 in soybeans with a linear range of 3.78-106.71 μg kg-1. Additionally, the ICA strips had excellent recovery rates, and the results were confirmed by liquid chromatography tandem mass spectrometry. Our study developed a method for the rapid on-site detection of IMQ residues in corn and soybeans.

Selective colorimetric detection of carbosulfan based on its hydrolysis behavior and Ti3C2/AuPt nanozyme

Selective colorimetric detection of carbosulfan based on its hydrolysis behavior and Ti3C2/AuPt nanozyme

Public Health Implications of Pesticide Residues in Food: Risks, Regulations, and Interventions

Pesticides enter food primarily through direct application to crops during farming, where residues can remain on the surface or be absorbed into plant tissues. Additionally, pesticide drift from nearby treated areas and contamination of soil or water used for irrigation can introduce residues into food crops, further increasing the risk of exposure. This paper focuses on the public health implications of pesticide residues in food. The paper found that pesticide residues in food pose significant public health challenges, with potential risks ranging from acute toxicity to chronic health issues such as cancer, endocrine disruption, and neurological disorders. Vulnerable populations, including children, pregnant women, and the elderly, are particularly at risk. Effective regulation and monitoring become crucial as the agricultural sector relies heavily on pesticides for crop protection. Regulatory bodies such as the World Health Organization (WHO), Food and Agriculture Organization of the United Nations (FAO), Environmental Protection Agency (EPA), and European Food Safety Authority (EFSA) play crucial roles in setting Maximum Residue Limits (MRLs) to ensure food safety. However, implementing these regulations faces obstacles, particularly in developing countries, where resource constraints, lack of technical expertise, and socio-economic factors impede effective monitoring. Integrating pest management (IPM), advanced monitoring techniques and consumer education are essential to mitigate the risks posed by pesticide residues. The global harmonization of pesticide standards and continued research into safer alternatives and residue detection methods are critical for ensuring a secure food supply. As agricultural practices evolve, a multi-stakeholder approach involving policymakers, farmers, and consumers will be vital in reducing pesticide exposure and safeguarding public health.

Multiresidue analysis of 200 pesticides in jasmine (Jasminum sambac (L.) Aiton) flowers

Multiresidue analysis of 200 pesticides in jasmine (Jasminum sambac (L.) Aiton) flowers

Highly efficient Z-scheme CeO2/Bi2MoO6 heterojunction strengthened by redox mediator for photoelectrochemical detection of tetracycline with enhanced sensitivity

Highly efficient Z-scheme CeO2/Bi2MoO6 heterojunction strengthened by redox mediator for photoelectrochemical detection of tetracycline with enhanced sensitivity

Single-atom ruthenium nanozyme-induced signal amplification strategy in photoelectrochemical aptasensor for ultrasensitive detection of chloramphenicol

Single-atom ruthenium nanozyme-induced signal amplification strategy in photoelectrochemical aptasensor for ultrasensitive detection of chloramphenicol

Research on detection and protection technology of DC residual current

Abstract To realize that the residual current device can accurately and quickly detect the fault when the fluctuating DC residual current occurs in the system and improve the system’s safety, a DC residual current detection and protection method based on VMD was proposed. Particle Swarm Optimization (PSO) was used to optimize the penalty factor and the number of decomposition layers of VMD. The minimum envelope entropy of the residual current signal is used as the fitness function to obtain the optimal combination. The criterion of fault occurrence is established based on the optimal modal component mutation characteristic of the residual current decomposed by VMD. Experiments show that this method can identify faults quickly and effectively when pulsating DC residual current is generated in the system.

β-Cyclodextrin based magnetic hyper-crosslinked polymer: A recyclable adsorbent for effective preconcentration of triazine herbicides in complex sample matrices

β-Cyclodextrin based magnetic hyper-crosslinked polymer: A recyclable adsorbent for effective preconcentration of triazine herbicides in complex sample matrices

A novel fluorescent and photothermal probe based on nanozyme-mediated cascade reaction for detecting organophosphorus pesticide residues

A novel fluorescent and photothermal probe based on nanozyme-mediated cascade reaction for detecting organophosphorus pesticide residues

Standardization of Gas chromatography method for detection of Deltamethrin residues in chicken meat

Standardization of Gas chromatography method for detection of Deltamethrin residues in chicken meat

Active ingredient identification and purification of organosilicon spray adjuvant and its uptake and translocation in rice (Oryza sativa L.).

The assessment of residue, absorption, conduction, and degradation of agricultural organosilicon surfactants in the environment is hindered by the lack of information on active ingredients and corresponding quantitative standards for organosilicon spray adjuvants. The spray adjuvant 'Jiexiaoli,' a primary organosilicon spray agent in China, was identified as hydroxy (polyethylene) propyl-heptamethyl trisiloxane (TSS-H) with 3-15 ethoxy (EO) groups. Purification of TSS-H was achieved through semi-preparative separation using high-performance liquid chromatography (HPLC), resulting in TSS-H purity exceeding 96%. An accurate residual detection method for nine oligomers (4-12 EO) of TSS-H in rice roots, stems, leaves, and culture solution samples was developed using HPLC tandem high-resolution mass spectrometry (HPLC-HRMS). Recoveries for nine oligomers of TSS-H in the four matrices ranged from 80.22% to 104.01%. Foliar application experiments demonstrated that TSS-H did not transfer from the upper to the lower parts of the rice plant. The half-lives of each oligomer (4-12 EO) in leaves were less than 3.21 days. Root application experiments revealed a root concentration factor (RCF) ranging from 0.20 to 0.56, a biological enrichment factor (BCF) ranging from 0.36 to 0.68, a transpiration factor (TSCF) ranging from 0.069 to 0.086, and a transport factor (TF) ranging from 0.08 to 0.43. These results indicated that TSS-H could be absorbed by rice roots and conducted to the above-ground parts of rice plants. This study fills the data gap in the environmental risk and food safety assessment of agricultural silicone spray adjuvants. © 2024 Society of Chemical Industry.

Stable detection of diazinon residues in vegetables by an electrochemiluminescent aptasensor based on the in-situ production of H2O2 from dual-catalytic glucose

Stable detection of diazinon residues in vegetables by an electrochemiluminescent aptasensor based on the in-situ production of H2O2 from dual-catalytic glucose

Migration characteristics and risk assessment of chemical hazardous substances in infant teether toys

Migration characteristics and risk assessment of chemical hazardous substances in infant teether toys

Validation and application of a method for determination of multi-class pesticides in muscle chicken breast fillets using QuEChERS extraction and GC/MS.

The occurrence of pesticide residues in animal products deserves attention because of the contamination by environmental pollutants and pesticides that may be present in the food that animals are fed. The goal of this work was the validation of a method for detection of residues of multiple classes of pesticide and determination of their residues in chicken breast fillets. Gas chromatography with mass spectrometry was used for analysis. A modified quick, easy, cheap, effective, rugged and safe (QuEChERS) method was put into practice for its validation and applied to real samples. The study optimised mass detection and investigated the effect of a freezing step during the preparation of samples. Pesticides were determined in samples from conventional and organic production. The impact of the matrix effect decreased, with the largest number of pesticides and satisfactory recovery determined by the application of mixed solvent acetonitrile and ethyl acetate for extraction. Detection of pesticide residues was achieved in a linear range between 5 and 50 µg/kg with satisfactory excellent correlation coefficients greater than 0.99. The recovery of all the pesticide residues ranged between 71.2 and 118.80%. The relative standard deviation was from 2.9% to 18.1% for all validated pesticide residues. The limits of quantification were in the range of 3.0-4.9 µg/kg. Out of 56 pesticide residues analysed in real samples, 5 were detected: α endosulfan, cypermethrin, endosulfan sulphate, permethrin and p,p´-dichlorodiphenyltrichloroethane (DDT) and their concentrations ranged from 4.9 to 15.2 µg/kg. All tested samples were compliant with the evaluation criteria, and detected values of pesticide residues were lower than the maximum residual levels.

Mechanism and Method for Residual Flux Detection of Transformer Cores Based on Different Polarities Response Currents

This paper proposes a residual flux detection method based on the different polarities of response currents. When a positive–negative alternating DC voltage is loaded, the direction of the residual flux can be determined by the difference between the various polarities of the response current waveforms. As a result, residual flux value can be calculated using the empirical formula that relates residual flux to the responce current. In this formula, unknown parameters can be obtained using the field-circuit coupling method. Finally, this paper employs a closed iron core as an example to obtain the corresponding formula and then verifies its accuracy through experiments. The results show that the accuracy of the proposed method is less than 5%, which is higher than that of other existing methods. The method presented in this paper not only accurately detects the residual flux of a transformer but also requires no additional energy from the transformer.

Smartphone-based dual inverse signal MOFs fluorescence sensing for intelligent on-site visual detection of malachite green

Smartphone-based dual inverse signal MOFs fluorescence sensing for intelligent on-site visual detection of malachite green

Immunochromatographic method based on PCN-222 with dual-signal output for the rapid and sensitive detection of furazolidone metabolites in animal-derived food

Immunochromatographic method based on PCN-222 with dual-signal output for the rapid and sensitive detection of furazolidone metabolites in animal-derived food

Carboxymethyl chitosan–modified UiO-66 for the rapid detection of fenpropathrin in grains

Carboxymethyl chitosan–modified UiO-66 for the rapid detection of fenpropathrin in grains

Dissipation behaviours, residues, and health risk of six herbicides in sugar beets under field conditions

Dissipation behaviours, residues, and health risk of six herbicides in sugar beets under field conditions