JOURNAL OF FOOD COMPOSITION AND ANALYSIS
·
2023
·
IF 4.3
Qinghua Yao,Deseng Su,Minmin Huang,Yunyun Zheng,Meizhen Chen,Qiu Lin,Hui Xu,Shaoxiao Zeng
Sensitive, simple and quick methods for determination of dinotefuran , cyromazine , and the metabolites 1-methyl-3-(tetrahydro-3-furylmethyl) guanidine (DN), 1-methyl-3-(tetrahydro-3-furylmethyl) urea (UF), and melamine in Agrocybe aegerita were established and validated by ultra-performance liquid chromatography tandem mass spectrometry (UPLC-MS/MS). The dissipation and residues of these compounds in A. aegerita were investigated. The field results showed that dinotefuran and cyromazine dissipated rapidly with half-lives ranging from 24.9 h to 38.5 h. The terminal residues of total dinotefuran (the sum of dinotefuran and its metabolites), cyromazine, and melamine in fresh mushroom samples collected with sampling intervals of 3 d to 6 d ranged from 0.089 to 0.652 mg/kg, 0.593 to 2.054 mg/kg, and 0.002 to 0.005 mg/kg, respectively. During the drying processes of A. aegerita, the processing factors of dinotefuran, cyromazine, DN, UF, and melamine were 0.028, 0.012, 0.301, 0.002, and 0.001, respectively. Given that cyromazine and dinotefuran are not registered for use on A. aegerita , dietary risk was assessed. Based on a consumption survey, risk quotient (RQ) values significantly below 1 implied that the risk of A. aegerita consumption was acceptable, although the risk for children was relatively higher. The findings could provide valuable guidance for the appropriate use of these insecticides in A. aegerita cultivation and serve as a scientific reference for setting corresponding maximum residue limits (MRL) in China.
研究领域:
食品科学
·
环境毒理学
·
分析化学
✓ 已验证
DOI
高影响因子
MICROCHEMICAL JOURNAL
·
2025
·
IF 5.1
Bin Yang,Jia Liu,Xin Liu,Shiyue Niu,Liqian Niu,Xian Wang,Xinxin Liu,Shuyun Bi
Acetamiprid and pymetrozine are effective pyridine insecticides used to kill aphids and whiteflies in agricultural products such as fruits, vegetables and rice, whose residues pose a serious threat to human health. Herein, the silver nanoparticles (AgNPs) modified by β -cyclodextrin ( β -CD) and nano-CuO (named as β -CD/CuO@AgNPs) were synthesized and it was used as surface-enhanced Raman spectroscopy (SERS) substrate to determine acetamiprid and pymetrozine. Among four SERS substrates such as AgNPs, β -CD/AgNPs, CuO@AgNPs and β -CD/CuO@AgNPs, β -CD/CuO@AgNPs exhibited the most substantial enhancement of the Raman signals for acetamiprid and pymetrozine, with the enhancement factors (EFs) of 2.16 × 10 6 and 3.86 × 10 6 , respectively. The XRD, TGA, TEM, HAADF-STEM, UV–vis and FT-IR were used to characterize β -CD/CuO@AgNPs and the combination of the substrate with acetamiprid/pymetrozine. Single factor experiment and response surface method were used to optimize pH, dosage of coagulant and nanosubstrate and mixing time. The influences of various interfering substances on the detection system were studied. The excellent linear relationships were respectively established for acetamiprid and pymetrozine in the range of 6.67 × 10 −9 –6.67 × 10 −7 and 1.00 × 10 −8 –1.00 × 10 −6 mol L −1 , with the limits of detection (LODs) were 0.36 and 0.94 nmol L −1 (S/N = 3). This project was successfully used for the detection of acetamiprid and pymetrozine in apple, pear and peach samples. The recoveries in the fruit samples were in the range of 95.5 %–105.0 %.
研究领域:
农业科学
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分析化学
·
食品安全
✓ 已验证
产品关联
DOI
高影响因子
Environmental Technology & Innovation
·
2025
·
IF 7.1
Haixu Zhang,Sen Yang,Xilu Zhang,Yaxin Pei,Mengxiao Chen,Hongge Chen,Jiran Zhang
Cyromazine, a widely used insect growth regulator, accumulates in livestock manure and poses risks to beneficial insects such as black soldier fly larvae (BSFL) during waste bioconversion. This study isolated two bacterial strains capable of degrading cyromazine, Bacillus subtilis CYR1 (CYR1) and Bacillus velezensis CYR2 (CYR2), from contaminated chicken manure. Both strains demonstrated significant degradation efficiency via hydrolysis of cyromazine to cyanuric acid, a less toxic metabolite. However, in chicken manure systems, degradation efficiency reached a plateau at approximately 20%, likely due to preferential utilization of alternative nitrogen sources and inherent metabolic constraints. These findings highlight the potential of microbial remediation to mitigate cyromazine contamination while underscoring the need for strain optimization and comprehensive ecotoxicological assessments.
研究领域:
环境科学
·
微生物学
·
昆虫学
✓ 已验证
产品关联
DOI
高影响因子
ANALYTICAL LETTERS
·
2012
·
IF 1.016
Kai Wu,Yunyou Zhou,Tao Li,Junyong Sun,Xiaoqing Xing,Qian Song
This paper reports a new optical probe for detect dalapon. We have synthesized the luminescent and stable CdTe quantum dots(QDs) capped with calix[6]arene(C[6]/SiO2/CdTe) via the sol-gel technique in aqueous media. These hybrid organic-inorganic compounds are characterized by IR spectroscopy, ultraviolet-visible spectroscopy (UV-vis), transmission electron microscopy (TEM), and fluorescence. We found that the C[6]/SiO2/CdTe were more stable and had higher fluorescence than the SiO2/CdTe nanoparticles (NPs). The C[6]/SiO2/CdTe show selectivity and sensitivity to dalapon via significant fluorescence intensity decrease. It can be ascribed to the Stern-Volmer equation. Under the optimal conditions, the relative fluorescent intensity was decreased linearly with increasing dalapon concentration in the range of 1.0–25.0 nmol/L with a detection limit of 0.262 nmol/L of dalapon. The possible underlying mechanism is discussed by Langmuir binding isotherm.
研究领域:
分析化学
·
环境科学
✓ 已验证
产品关联
DOI
高影响因子
FLUID PHASE EQUILIBRIA
·
2018
·
IF 2.197
Pengshuai Zhang,Rui Zhao,Chi Zhang,Tao Li,Baozeng Ren
The solubility of cyromazine in the pure solvents (methanol, ethanol, 1-propanol, 1-butanol, 1-pentanol, 1-hexanol, 1-heptanol, water, acetone, 2-propanol, isobutanol , 3-methyl-1-butanol and 2-butanol) at 283.15 K–323.15 K, cyromazine in the pure solvents (acetic acid and acrylic acid) at 293.15 K–333.15 K and cyromazine in the pure solvent of propanoic acid at 278.15 K–318.15 K. were measured by a laser dynamic method under atmospheric pressure. The experimental results show that the mole fraction solubility of cyromazine in the sixteen pure solvents decreased according to the following order: acrylic acid > acetic acid > propanoic acid > methanol > ethanol ≈ water > 1-propanol > 1-butanol >1-pentanol >1-hexanol > 1-heptanol > 3-methyl-1-butanol ≈ (2-propanol, 2-butanol, isobutanol and acetone). In order to facilitate industrial application (to improve the purity of cyromazine by crystallization in industry) and other research studies, the experimental solubility data are correlated with the five thermodynamic models: modified Apelblat equation, λh equation, non-random two liquid (NRTL) model equation, Wilson model equation and van't Hoff equation. Moreover, the mixing Gibbs energy (Δ mix G ), mixing entropy (Δ mix S ), mixing enthalpy (Δ mix H ), activity coefficient ( γ 1 ∞ ) at infinitesimal concentration and reduced excess enthalpy ( H 1 E , ∞ ) were obtained and the mixing process of cyromazine in the selected solvents are evaluated based on the Wilson model. The relatively close values of γ 1 ∞ and γ 1 indicated that the cyromazine -selected solvents solution systems are not highly non-ideal.
研究领域:
化学工程
·
药学
✓ 已验证
产品关联
DOI
高影响因子
JOURNAL OF MOLECULAR LIQUIDS
·
2018
·
IF 4.513
Pengshuai Zhang,Rui Zhao,Chi Zhang,Yameng Wan,Tao Li,Baozeng Ren
The solubility of cyromazine in three binary solvent mixtures (acetic acid + water, propanoic acid + water, ethylene glycol + water) were measured by a gravimetric method from 278.15 K to 333.15 K under atmospheric pressure. The experimental results reveal that the mole fraction solubility of cyromazine increased with the increase of temperature in the three solvents. The Apelblat equation, the λh equation, the general single model ( GSM ) equation and the modified Jouyban-Acree model equation were all applied to correlate the experimental solubility of cyromazine well. Moreover, the dissolution thermodynamic properties: Δ sol H 0 (the apparent standard enthalpy change), Δ sol S 0 (the apparent standard entropy change), Δ sol G 0 (the apparent standard Gibbs energy change), ζ H (relative contribution of enthalpy) and ζ TS (relative contribution of entropy) of the dissolution of cyromazine in the selected solvents were calculated. The positive values of Δ sol H 0 , Δ sol G 0 , ζ H ≥ 0.5984 and ζ TS ≤ 0.4016 indicated that the dissolution of cyromazine in the three binary solvents was enthalpy-driving and endothermic process. The experimental solubility of cyromazine in this work can provide good guidance and fundamental data for the crystallization, purification and application of cyromazine.
研究领域:
化学工程
·
药物化学
✓ 已验证
产品关联
DOI
高影响因子
Food Analytical Methods
·
2016
·Vol. 10
·期 5
·1386-1396
·
IF 2.167
Wang Yu,Gao Lei,Qin Dongli,Chen Ligang
In this work, a simple and selective method based on matrix solid phase dispersion (MSPD) using molecularly imprinted polymers (MIPs) as sorbents was successfully developed for the determination of melamine (MEL) in milk powder. The MIPs have been prepared by surface imprinted polymerization method using carbon nanotube (CNT) as support, MEL as template molecule, γ-aminopropyltriethoxysilane as functional monomer, and tetraethyl orthosilicate as cross-linking agent. The MIPs were characterized by Fourier transform infrared spectrometer and scanning electron microscopy. At the same time, the adsorption isotherm, dynamic adsorption, and selective adsorption of MIPs to MEL were also studied. The prepared MIPs were used as dispersant of MSPD to extraction and separate MEL in milk powder. We optimized the extraction conditions as follows: the ratio of MIPs to sample was 2:3; the dispersion time was 10 min; washing solvent was 2.0 mL acetonitrile; and elution solvent was 4.0 mL ammonium methanol (5:95, v / v ). Once the MSPD process was completed, the MEL extracted from milk powder was determined by LC-MS/MS. Under the optimal conditions, the limit of detection of MEL was 0.2 ng g −1 . The relative standard deviations of intra-day and inter-day were obtained in the range of 0.4∼5.1 %. The satisfied recoveries of MEL were 92.5∼97.2 %. The MIP-MSPD method has some advantages, such as higher selectivity, lower cost of preparation, less time consuming and organic solvent consumption, simpler sample pretreatment procedure, and higher extraction recovery compared with those existing methods which were used for determination of MEL.
研究领域:
食品科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
NEW JOURNAL OF CHEMISTRY
·
2017
·Vol. 41
·期 22
·13370-13376
·
IF 3.269
Junbo Liu,Yan Wang,Shanshan Tang,Qian Gao,Ruifa Jin
In this study, molecular imprinted polymers (MIPs) have been prepared using dicyandiamide (DCD) as the template molecule, methacrylic acid (MAA) as the functional monomer, and pentaerythritol triacrylate (PETA) as the cross-linker. On the basis of density functional theory (DFT), we simulated the pre-configuration between DCD and MAA by Gaussian 09 software. The best imprinted molar ratio was optimized according to the geometric configuration of the stable complexes, the bonding situation, and the binding energy (ΔE). The nature of the imprinting effect was also studied by topological analysis. The theoretical results indicated that the optimum molar ratio was 1 : 5. The ultraviolet spectra showed that the complex with the molar ratio 1 : 5 showed the largest absorbance at λ = 216 nm. The apparent maximum adsorption quantity (Qmax) was 17.24 mg g−1. In this study, the DCD-MIPs displayed good adsorption properties towards DCD, which could be applied for the separation and detection of DCD in a complex matrix.
研究领域:
化学
·
材料科学
✓ 已验证
产品关联
DOI
高影响因子
FOOD AND CHEMICAL TOXICOLOGY
·
2023
·
IF 4.3
Yuanhao Zhou,Jiawen Ai,Lingli Cai,Yiyong Yan,BingZhi Wang,Hongzhen Ma,Quan Yu,Jianhua Zhou,Xinming Huo
Excessive pesticide use poses a significant threat to food safety. Rapid on-site detection of multi-target pesticide residues in vegetables is crucial due to their widespread distribution and limited shelf life. In this study, a rapid on-site screening method for pesticide residues on vegetable surfaces was developed by employing a miniature mass spectrometer . A direct pretreatment method involves placing vegetables and elution solution into a customized flexible ziplock bag, allowing thorough mixing, washing, and filtration. This process effectively removes pesticide residues from vegetable surfaces with minimal organic solvent usage and can be completed within 2 min. Moreover, this study introduced a deep learning algorithm based on a one-dimensional convolutional neural network, coupled with a feature database, to autonomously discriminate detection outcomes. By combining full scan MS and tandem MS analysis methods, the proposed method achieved a qualitative recognition accuracy of 99.62%. Following the qualitative discrimination stage, the target pesticide residue and internal standard can be simultaneously isolated and fragmented in the ion trap, thus enabling on-site quantitative analysis and warning. This method achieved a quantitative detection limit of 10 μg/kg for carbendazim in cowpea. These results demonstrate the feasibility of the proposed analytical system and strategy in food safety applications.
研究领域:
食品安全
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
危险品化学品经营许可证（带存储）