JOURNAL OF MOLECULAR LIQUIDS
·
2024
·
IF 5.3
Kexin Yang,Yanyan Huang,Huan Lin,Yiming Zhao,Yushan Hou,Jie Zhou,Chenxi Zhao,Chenyu Qi,Yaowei Zhang,Lingyun Li,Chen Yin,Gaofeng Cao,Guangyang Liu,Miaomiao Liu,Donghui Xu
Inspired by the surface structure of mussel, a novel bionic adsorbent (MPN@COFs) was prepared using an in situ synthetic strategy for the selective adsorption of caffeine and the physicochemical structure, surface morphology and composition of were characterized by scanning electron microscopy, Fourier-transform infrared spectrometry, X-ray photoelectron spectroscopy. The analytical data showed that the specific surface area of MPN @ COF was as high as 133.62 m 2 /g, which was stable and adaptable to acid and alkaline environments, with a adsorption rate of 78 %, and still maintained a high adsorption rate after reuse for three times. The adsorption isotherms and adsorption kinetics fit the Langmuir model and the quasi-secondary kinetic model better, respectively. Compared with single COFs and MPN, the adsorption efficiency of MPN@COFs increased by 40.54 % and 57.65 %, respectively. Moreover, the composite material could be reused three times, the HPLC-MS/MS method established in this study has high sensitivity, and this rapid detection technique can provide strong support for the detection of caffeine in beverages and the removal of caffeine from tea and its products.
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
JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY
·
2023
·
IF 6.1
Lingyuan Xu,A. M. Abd El Aty,Zhen Cao,Xingmei Lei,Jing Zhao,Jia Li,Song Gao,Yun Zhao,Yongxin She,Fen Jin,Jing Wang,Maojun Jin,Bruce D. Hammock
The synthesis of a hapten and antigen for the preparation of a monoclonal antibody (mAb) for buprofezin is described. The recognition mechanism of hapten and buprofezin by monoclonal antibodies (mAb-19F2) is described. The effectiveness of the mAb-19F2 immunoassay technique was assessed, and the effective detection of buprofezin in tea samples was achieved through the establishment of indirect competitive enzyme-linked immunosorbent assay (ic-ELISA) and colloidal gold immunochromatography assay (GICA). The mAb-19F2 subtype was IgG1, with an IC50 of 1.8 ng/mL and a linear range (IC20–IC80) of 0.6–5.4 μg/L, and had a cross-reaction rate of less than 0.18% with 29 other pesticides (neonicotinoids and insect growth regulators). The study identified π–π stacking interactions between hapten and TYR-61 at the mAb-19F2 site and alkyl/phosphate interactions with TRP-105 and ARG-103. The ic-ELISA had an IC50 of 12.9 ng/mL in green tea and 5.65 ng/mL in black tea, with a recovery rate of 92.4%–101.0% and RSD of 2.1%–4.8%. The GICA had a limit of detection (LOD) was 500 ng/mL, with the complete disappearance of the test lines visible to the naked eye. The limit of quantitation (LOQ, IC20) was determined to be 16.8 ng/mL. Additionally, the developed GICA showed no cross-reactivity with neonicotinoid pesticides. The recovery rate of tea spiked recovered samples was 83.6%–92.2%, with an RSD of 5.3%–12.6%, and the results were consistent with the LC/MS method. This study is important for the real-time detection of buprofezin residues to ensure food safety and human health.
研究领域:
食品科学
·
免疫学
·
分析化学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
TALANTA
·
2016
·
IF 4.035
Qiming Zhao,Shuchao Wu,Peimin Zhang,Yan Zhu
Monodisperse carbonaceous spheres produced by the hydrothermal carbonization of sucrose were first applied as green stationary phase for ion chromatography after quaternization . Depending on the polycondensation of methylamine and 1,4-butanediol diglycidyl ether, polymer containing quaternary ammonium groups were facilely grafted onto the surfaces of hydrothermal carbonaceous spheres (HCSs). The quaternized HCSs with different number of polyelectrolyte layers were characterized by scanning electron microscopy, brunauer-emmett-teller, fourier transform infrared spectroscopy, X-ray photoelectron spectroscopy, thermogravimetric analysis and elemental analysis . The measurements of breakthrough curves demonstrated that more layers of grafted polyelectrolyte resulted in higher anion exchange capacity of stationary phase. With good stability, common inorganic anions , monocarboxylic acids , polarizable anions and carbohydrates were effectively separated on the stationary phases, respectively. The high hydrophilicity of HCS surface afforded excellent peak symmetry for all analytes. Furthermore, high-capacity HCSs stationary phase was successfully applied to detect fluoride in tea samples.
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
SPECTROCHIMICA ACTA PART A-MOLECULAR AND BIOMOLECULAR SPECTROSCOPY
·
2021
·
IF 4.098
Yujiao Wang,Qingyu Guo,Xingyi Wu,Haixiang Gao,Runhua Lu,Wenfeng Zhou
In this study, a novel FONs-based sensor P-M(w) was synthesized using 1-Pyrenecarboxaldehyde and L-methionine through facile hydrothermal strategy. The fluorescence emission peaks of the acquired P-M(w) would show specific changes after the addition of Hg 2+ due to interfering the PET process and inducing nano-structure conformational rigidification of P-M(w). Notably, the water-soluble FONs-based sensor was firstly used to detect Hg 2+ in tea samples providing a new material choice for the fluorescence sensor construction of metal ion detection. Besides, the qualitative and quantitative analysis of Hg 2+ could be carried out with P-M (w) at a very low concentration (1 μg/mL) meaning that the acquired P-M(w) synthesized by few grams of reactants may satisfy the detection of approximate fifty thousand samples.
研究领域:
分析化学
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环境科学
·
食品科学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
MICROCHEMICAL JOURNAL
·
2020
·
IF 3.594
Huanhuan Li,Shujat Ali,Wenya Wei,Yi Xu,Haowei Lu,Md Mehedi Hassan,Xiangyang Wu,Min Zuo,Qin Ouyang,Quansheng Chen
In this study, a novel fluorescence approach for the rapid and selective detection of organophosphorus pesticides is presented. The strategy is based on inhibition of acetylcholinesterase (AChE) activity and NaY/GdF 4 :Yb, Er up-conversion nanoparticles (UCNPs) fabricated with manganese dioxide (MnO 2 ) nanosheets. Water-soluble UCNPs were first synthesized, and MnO 2 nanosheets were fabricated on their surface to get an efficient quencher for up-conversion fluorescence. Subsequently, AChE was used to restore the fluorescence by dissociation of MnO 2 nanosheets from the surface of UCNPs. When diazinon was added into the system, AChE activity was irreversibly impeded and resulted in the quenching of fluorescence. The inhibitory effect was linearly dependent on the concentration of the pesticide. Under the optimized conditions, the proposed sensor showed excellent performance for the detection of diazinon with a wide detection range of 0.1 to 30 ng/mL and a low detection limit (LOD) of 0.1 ng/mL. Besides, the system showed a good selectivity and was applied for diazinon detection in adulterated tea samples with a recovery rate of 98% to 111%. The unique advantages of the strategy such as simple, cost-effective, highly selective and sensitive make it an attractive approach for the detection of OPs in tea commodities.
研究领域:
分析化学
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食品安全
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纳米技术
·
生物传感
✓ 已验证
DOI
高影响因子
Analytical Methods
·
2015
·Vol. 7
·期 5
·2093-2099
·
IF 1.821
Wei Xiong,Chunsheng Cheng,Yaling Yang
A method to separate and preconcentrate trace levels of chromium using silver nanoparticle (Ag NP) technology and suspension dispersive solid phase extraction is proposed. The synthesized Ag NPs combine with chromium to form aggregations. Suspension dispersive solid phase extraction is based on the reaction of zinc sulfate (ZnSO4) and sodium hydroxide (NaOH) to form a zinc hydroxide suspension. The UV-vis absorption spectra and transmission electron microscopy (TEM) confirmed the aggregation of the Ag NPs. The influence of several parameters, such as volume of silver nitrate, extraction temperature, the solution pH, type and mass of the sorbent, vortex time, equilibration time, Ag NP volume, and the type, concentration and volume of the acid and foreign ions were investigated and optimized. Linearity was investigated from 10 to 1000 μg L−1, and the correlation coefficient was 0.9988. Recoveries of 97.7–103.3% and an enrichment factor of 20 were achieved with 40 mL of sample. The LOD was 3.2 μg L−1 for total chromium, and the relative standard deviation (RSD) was 4.2% at 20 μg L−1. This method is simple and is successfully applied for the determination of chromium in tea samples with satisfactory results.
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 Cleaner Production
·
2024
·
IF 9.7
Liushan Jiang,Yue Zhang,Shiyu Huang,Jingwen Niu,Huanhuan Liu,Shuai Yuan,Qingxiang Zhou
Polycyclic aromatic hydrocarbons (PAHs) and sulfur-containing heterocyclic aromatic hydrocarbons (PASHs) are typical organic pollutants that are commonly present in the environment. Due to the continuous accumulation and transfer in the food chain, they will pose a significant threat to human life and health. In the present work, a new method was constructed with a ternary magnetic nanocomposite (Fe 0 @MXene@COF-LZU1) based magnetic solid phase extraction in combination with gas chromatography-tandem mass spectrometry (GC-MS/MS) for sensitive determination of them at trace level in Chinese tea samples. The magnetic nanomaterial Fe 0 @MXene@COF-LZU1 was synthesized via reduction and Schiff base reactions. The experimental results demonstrated that Fe 0 @MXene@COF-LZU1 had high adsorption ability and satisfactory chemical stability. Under the optimal experimental conditions, the method possessed good linearity in the concentration ranges of 0.0005 μgL −1 - 50 μg L −1 for dibenzothiophene (DBT), phenanthrene (PHE), fluoranthene (FLT) and pyrene (PYR), and 0.001 μg L −1 - 50 μg L −1 for 4-methyldibenzothiophene (4-MDBT) and 4,6-dimethyldibenzothiophene (4,6-DMDBT). The detection limits of this method were in the range of 0.014 ng L −1 -0.83 ng L −1 . The results of real samples demonstrated that the designed magnetic nanocomposite had a promising application prospect for measuring PAHs and PASHs.
研究领域:
环境科学
·
分析化学
✓ 已验证
产品关联
DOI
高影响因子
MICROCHIMICA ACTA
·
2020
·Vol. 187
·期 10
·1-10
·
IF 6.232
Zhen Deshuai,Shi Sisi,Gao Chan,Kang Qing,Xiao Xilin,Grimes Craig A.,Cai Qingyun
Bi, Fe, and Ti ternary co-doped ZrO 2 (BFT-ZrO 2 ) nanocomposites have been prepared by a sol-gel process and used as both adsorbent and matrix for the enrichment and determination of small molecules by surface-enhanced laser desorption/ionization time-of-flight mass spectrometry (SELDI-TOF MS). The BFT-ZrO 2 nanocomposites not only can selectively enrich a wide variety of low-mass toxic pollutants but can also be used as an excellent matrix to enhance the laser desorption/ionization efficiency with low background noise and uniform co-crystalline film. Low limits of detection (LODs) (0.1 pg mL −1 for bisphenol A (BPA), 2 pg mL −1 for tetrabromobisphenol A (TBBPA), 0.1 pg mL −1 for alizarin (AZ), 0.001 pg mL −1 for bisphenol S (BPS), 0.01 pg mL −1 for indigo blue (ID), 0.01 pg mL −1 for pentachlorophenol (PCP), 100 pg mL −1 for estradiol (E2), 0.001 pg mL −1 for cetyltrimethylammonium bromide (CTAB), 0.1 pg mL −1 for crystal violet (CV), 1 pg mL −1 for malachite green (MG), 0.01 pg mL −1 for rhodamine B (RhB), and 0.01 pg mL −1 for perfluorooctane sulfonate (PFOS) were achieved. The relative standard deviations (RSDs) of shot-to-shot are 9.4–24% and of sample-to-sample 5.2–17%. The BFT-ZrO 2 matrix was successfully applied to the determination of TBBPA and BPA in tea samples. This method shows a new strategy for determination of toxic compounds in tea.
Graphical abstract
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
JOURNAL OF CHROMATOGRAPHY A
·
2020
·
IF 4.049
Huixiao Duo,Xiaofen Lu,Xiaobin Nie,Licheng Wang,Shuai Wang,Xiaojing Liang,Yong Guo
Ferric oxide/carbon (Fe 2 O 3 @C) was fabricated via direct carbonization of metal-organic framework of iron (MOF-235) under argon atmosphere. The magnetic Fe 2 O 3 nanoparticles are evenly embedded in porous carbon matrix, while original morphology of MOF-235 was well-maintained. The synthesized Fe 2 O 3 @C was used as magnetic sorbent for extracting five benzoylurea insecticides (BUs). The materials exhibited excellent extraction performance, which benefited not only from the strong π-π interaction and hydrophobic interaction (π-conjugated system), but also to the abundant adsorption sites and flexible transport channel (the interconnected 3D porous structure). A three-factor-three-level Box-Behnken design (BBD) was selected to optimize three greatly influential parameters: amount of adsorbent (A), desorption time (B) and volume of desorption solvent (C) by response surface methodology. The established method coupled to HPLC-UV detection showed wide linearity with the range of 0.2–450 μg•L −1 , relatively low limits of detection (0.05–0.10 μg•L −1 ) with the relative standard deviation (RSD) ( n = 7) lower t than 5.47%. Moreover, the proposed method was successfully applied to analyze BUs in tea samples and investigate the removal effect of different washing on BUs residues from tea leaf. These results indicated that the synthesized Fe 2 O 3 @C is a promising adsorbent material for magnetic solid phase extraction of BUs at trace concentrations from tea samples.
研究领域:
分析化学
·
环境科学
·
材料科学
✓ 已验证
DOI
高影响因子
Food Analytical Methods
·
2013
·Vol. 7
·期 2
·291-297
·
IF 1.969
Wen Shengping,Zhu Xiashi
A simple and rapid method based on dispersive liquid–liquid microextraction with room temperature ionic liquid 1,3-dibutylimidazolium hexafluorophosophate ([BBIM][PF 6 ]) coupled to flame atomic absorption spectrometry was developed for the speciation of Mn(II)/Mn(VII) in tea samples. The main factors affecting dispersive liquid–liquid microextraction were investigated in detail. Mn(II) and total manganese [Mn(II)+Mn(VII)] were quantitatively extracted after adjusting aqueous sample solution to pH 10.0 and 7.0, respectively. Mn(VII) was calculated by subtraction of Mn(II) from total manganese. Under the optimized conditions, the limits of detection (3 σ ) for Mn(II) and Mn(VII) were 0.26 and 1.86 ng/mL, and their relative standard deviations were 2.6 and 4.8 % ( n = 7, c = 25.00 ng/mL). The proposed method was validated by the determination of Mn(II) and Mn(VII) in the certified reference material [GBW(E)08513] of tea sample and different local tea samples with satisfactory results.
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
International Journal of Electrochemical Science
·
2023
·
IF 1.5
Yanju Wu,Jianyao Kou,Lijie Wang,Long Cheng,Kui Lu
In this work, Langmuir-Blodgett (LB) technique was proposed to fabricate the homogeneous and controlled films of Nafion-nitrogen doped carbon nanotubes (Nafion-NCNTs). Microstructure and electrochemical performance of LB films of Nafion-NCNTs was characterized by atomic force microscopy (AFM) images, scanning electron microscopy (SEM) images and electrochemical experiments. Moreover, the LB film of Nafion-NCNTs was transferred to the surface of glassy carbon (GC) electrode to fabricate the electrochemical sensor to apply for determination of caffeine. Electrochemical experiments show that the LB films of Nafion-NCNTs modified GC electrode can effectively increase electrochemical response of caffeine. Under the optimum conditions, the oxidation peak current of caffeine was proportional to its concentration in the range of 8.0 × 10 -8 ~ 4.0 x 10 -6 mol L -1 , with a detection limit of 2.0 × 10 -8 mol L -1 . And the modified GC electrode showed excellent selectivity, good stability and repeatability. It also was successfully used for determination of the content of caffeine in tea samples.
研究领域:
材料科学
·
分析化学
✓ 已验证
DOI
高影响因子
JOURNAL OF SEPARATION SCIENCE
·
2019
·Vol. 42
·期 7
·1304-1311
·
IF 2.516
Guanwei Gao,Hongping Chen,Yunfeng Chai,Lili Jin,Xin Liu,Chengyin Lu
Phthalimide can be formed from either the degradation of folpet and phosmet, or reaction of phthalic anhydride with primary amino groups. Consequently, the sum of phthalimide and folpet, expressed as folpet-residue definition, is highly prone to false-positive levels of folpet in tea. An analytical method is thus urgently needed to investigate the residue level and source of phthalimide in tea. In this work, we developed an accurate method of determining phthalimide and phthalic acid (the indicator of phthalic anhydride) by acetonitrile extraction and 3-bromopropyltrimethylammonium bromide derivatization coupled with ultra high performance liquid chromatography and high-resolution mass spectrometry. The method was validated, and linearity (correlation coefficients > 0.99) was obtained. Satisfactory recoveries at 10, 20, 50, and 100 μg/kg ranged from 76 to 117%, and the intra- and interday accuracies were <23%. The limit of quantification for phthalimide and phthalic acid was 10 μg/kg. The developed method was further successfully used to determine phthalimide and phthalic acid in some tea samples. The positive rate of phthalimide and phthalic acid detected in the tea samples ranged from 30–75 and 50–90%, respectively.
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
危险品化学品经营许可证（带存储）