TALANTA
·
2020
·
IF 5.339
Bing Qiang Zou,Hong Zhi Zhang,Zhu Fu,Tianrong Zhan,Jian Wang
As an important sulfur compound , thiourea (TU) has caused great concern because of its wide application as well as its serious toxicity and hazard to the environment. Thus, it is necessary to develop a sensitive and selective method for TU analysis. In this work, gold nanorods (AuNRs) acted as an optical probe to realize the sensitive and colorimetric detection of TU. In HCl medium, Fe 3+ at low concentration was difficult to oxide Au 0 to form Au + because of the high redox potential or the positive Gibbs free energy change . However, this process was possible when TU was present since the association constant between Au + and TU is great enough to bind with TU to form a stable complex to further promote the etching of AuNRs, resulting in the lower aspect ratio of AuNRs with the blue shift and intensity decrease in extinction spectra, accompanied by the divisive colors of AuNRs solution or colorful dark-field light scattering imaging of single AuNR. The blue-shift of AuNRs longitudinal plasmon resonance absorption (LPRA) band was proportional to the concentration of TU in the range of 1–250 nM and the limit of detection (3σ/k) was as low as 0.4 nM. In addition, the colorimetric method was proven with high selectivity in the presence of potential interfering compounds, which was successfully applied to the detection of TU in fruit juice samples. This proposed colorimetric method provides a simple, sensitive yet selective measurement tool for TU sensing, which may offer new opportunities in the development of colorimetric sensors for food safety in the future.
研究领域:
分析化学
·
食品安全
✓ 已验证
产品关联
DOI
PubMed
高影响因子
Food Analytical Methods
·
2022
·Vol. 15
·期 5
·1356-1367
·
IF 3.498
Gu Yu-Xin,Yan Tian-Ci,Yue Zi-Xuan,Li Min-Hui,Zheng Hui,Wang Shu-Ling,Cao Jun
A novel dispersive micro-solid-phase extraction (DMSPE) method is established for the determination of seven acaricides (clofentezine, benzomate, fenpyroximate, diafenthiuron, pyridaben, doramectin, and ivermectin) in fruit juice and functional food by ultra-high-performance liquid chromatography. In this method, these analytes were extracted from apple juice and curcuma wenyujin using cucurbituril used as the adsorbent, water as the extraction solvent, and methanol as the elution solvent. The primary parameters affecting the extraction efficiency were optimized by experiments for concentration of adsorbent, oscillation time, desorption solvent, and pH value and by response surface methodology. Under the optimal conditions, all target analytes had a good linear relationship, with correlation coefficients ranging from 0.9900 to 0.9940, the limits of detection were 0.42–5.16 ng/mL, the limits of quantification were 1.39–17.18 ng/mL, and the spiked recoveries of seven target compounds in real samples ranged from 70.04 to 94.95%. The intra-day precision RSD variations ranged from 0.13 to 0.70%, and the inter-day precision RSDs were between 0.38 and 1.4%, which had good reproducibility and repeatability. In general, DMSPE is a convenient, efficient, and environmentally friendly method for sample preparation, which has the potential for microextraction.
研究领域:
分析化学
·
食品安全
✓ 已验证
产品关联
DOI
高影响因子
FOOD CHEMISTRY
·
2016
·
IF 4.052
Yi Hao,Ruixia Gao,Dechun Liu,Gaiyan He,Yuhai Tang,Zengjun Guo
In this paper, the novel hydrophilic magnetic molecularly imprinted nanoparticles were developed for selective separation and determination of chlorogenic acid in aqueous fruit juices. The polymers were prepared by using amino-functionalized magnetic nanoparticles as carriers, branched polyethyleneimine as functional monomer, and chlorogenic acid as template molecule. Branched polyethyleneimine with abundant active amino groups could react with template sufficiently, and its unique dendritic structure may amplify the number of the imprinted cavities. Meanwhile, it would improve the hydrophilicity of imprinted materials for attaining high extraction efficiency. The resulted polymers exhibit fast kinetics, high adsorption capacity, and favorable selectivity. In addition, the obtained nanoparticles were used as solid-phase extraction sorbents for selective isolation and determination of chlorogenic acid in peach, apple, and grape juices (0.92, 4.21, and 0.75 μg mL −1 , respectively).
研究领域:
食品科学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2021
·Vol. 11
·期 3
·1668-1678
·
IF 3.361
Dechao Chen,Sai Ma,Xiaofan Zhang,Xuedong Wang,Ming Gao,Jieyi Li,Huili Wang
The reported ionic liquid (IL)-based magnetic effervescent tablets are a result of direct addition of ILs and magnetic nanoparticles (MNPs). In effervescent reaction-enhanced microextraction procedures, the dissociation between ILs and MNPs easily leads to loss of ILs due to aqueous solubility, thereby decreasing the extraction efficiency. Herein, we attached a hydrophilic IL ([BMIM]Br) onto the surface of NiFe2O4@SiO2@polyaniline (NiFe2O4@SiO2@PANI-IL) to prepare novel core–shell-like multi-layer nanocomposites. Magnetic effervescent tablets were composed of Na2CO3 as an alkaline source, tartaric acid as an acidic source and as-synthesized nanocomposites as an extractant. The nanocomposites were used in an effervescent reaction-enhanced magnetic solid-phase extraction (ERMSE) for the extraction of four organophosphorus pesticides (OPPs) in fruit juices prior to HPLC-DAD detection. Under optimized conditions, this method provided low limits of detection (0.06–0.17 μg L−1), high recoveries (80.6–97.3%) and excellent precision (1.1–5.2%) for OPP quantification in five fruit juices. Notably, the three-layer core–shell nanocomposites were efficiently recycled for at least eight extraction cycles with a recovery loss of <10%. The novelty of this study lies in: (1) for the first time, the ILs-based hybrid magnetic nanocomposites were prepared with appropriate pore size/volume and more active sites for OPPs; (2) the combination of the nanocomposites with effervescent tablets realizes rapid dispersion of CO2 bubbles, and convenient magnetic separation/collection into one synchronous step; and (3) due to there being no requirement of electrical power, it is feasible for use in field conditions. Thus, the ERMSE method has excellent potential for conventional monitoring of trace-level OPPs in complex fruit juice matrices.
研究领域:
分析化学
·
环境科学
·
食品科学
✓ 已验证
DOI
高影响因子
Analytical Methods
·
2014
·Vol. 6
·期 20
·8328-8336
·
IF 1.938
Yubo Li,Xiaoling Yang,Jiaheng Zhang,Min Li,Xuhao Zhao,Kun Yuan,Xiaobing Li,Runhua Lu,Wenfeng Zhou,Haixiang Gao
A fast microextraction technique, termed as ultrasound-assisted emulsification magnetic microextraction, was developed for the determination of triazole fungicides (penconazole, tebuconazole and myclobutanil) in fruit juice samples by gas chromatography flame ionization detection. The distinct advantage of the proposed method is that a low toxic solvent, 1-octanol, is used as an extractant, without using a disperser. With the help of ultrasound, emulsification can be obtained. Magnetic nanoparticles are applied to retrieve the extractant, replacing centrifugation. Under optimal conditions, good linearity in the range of 5 μg L−1 to 500 μg L−1, repeatability (RSD 3.5–7.7%), low LODs (1.8–2.3 μg L−1) and good recovery (85.4–105%) were obtained. Additionally, the intermolecular binding energies were theoretically studied using density functional theory and the explicit solvent molecule model. A high correlation was found among the extraction efficiency, Kow and the calculated energies, which may guide the application of extractants and the selectivity of the target analytes in analytical methods.
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
JOURNAL OF CHROMATOGRAPHIC SCIENCE
·
2025
·Vol. 63
·期 5
·
IF 1.3
Yang Qinghua,Deng Honghai,Shi Yilan,Qiu Qianying,Wang Jinxin,Ping Wenhui,Gu Jun,Zhang Weibing
A fast, simple and effective method was developed and validated for determination of 11 fungicides using magnetic solid-phase extraction with NH2-Fe3O4@GO (graphene oxide) combined with gas chromatography–triple quadrupole mass spectrometry (GC–MS/MS). To carry out the extraction of the fungicides from samples, NH2-Fe3O4@GO nanocomposites were synthesized and characterized by scanning electron microscopy, Fourier transform infrared spectroscopy and X-ray diffraction. The target analytes were extracted on NH2-Fe3O4@GO and then eluted by ethyl acetate and acetonitrile (1:1 v/v). Finally, the extraction solvent concentrated by nitrogen blowing was analyzed by GC–MS/MS, which demonstrated good linearity between 0.05 and 5.0 mg L−1. The limits of detection (signal-to-noise ratio = 3) and the limits of quantification (signal-to-noise ratio = 10) for the 11 fungicides ranged from 1.0 to 3.5 and 3.0 to 10.5 μg kg−1, respectively. The accuracy and precision of the proposed method were evaluated by measuring tagged samples; the recoveries and relative standard deviations ranged from 75.3% to 103.9% and 2.19% to 4.68%, respectively. The utility of the adsorbent was demonstrated to determine trace fungicides in fresh fruit juice samples.
研究领域:
分析化学
·
食品安全
✓ 已验证
DOI
PubMed
高影响因子
FOOD RESEARCH INTERNATIONAL
·
2024
·
IF 7
Bingzhi Li,Kun Cheng,Pengyu Chen,Linpin Luo,Liang Zhang,Ting Du,Tong Zhang,Qingqing Li,Yiyue Ma,Jing Sun,Maojun Jin,Jianlong Wang,Yiping Chen
The acidophilic and heat-resistant characteristics of Alicyclobacillus acidoterrestris ( A. acidoterrestris ) pose significant challenges to fruit juice production. Traditional thermal removal methods are often ineffective against this resilient bacterium. To address this issue, we developed a novel adsorbent, magnetic carbonation carbon-lysozyme nanohybrid (MCL), composed of magnetic nanoparticles with a thin carbon shell and covalently grafted lysozyme. The outer lysozyme facilitates binding to the bacterial surface through two modes: electrostatic attraction and chemical interaction, acting as a vital engine for bacterial adhesion. The ultrathin carbon coating enhances dispersion, reduces magnetic loss, provides more adsorption sites for lysozyme grafting, and ensures stable function in acidic environments. Benefiting from the large surface area of MCL and the specific peptidoglycan recognition structure of lysozyme, MCL exhibits rapid adsorption kinetics and can completely remove 10 4 CFU/mL of A. acidoterrestris from juice within 20 min. The MCL demonstrates excellent capture performance, negligible cytotoxicity, and no significant impact on juice quality, offering a promising non-thermal strategy to improve juice safety.
研究领域:
食品科学
·
微生物学
·
纳米技术
·
生物技术
✓ 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）