ANALYTICA CHIMICA ACTA
·
2024
·
IF 5.7
Longrui Yang,Xiaoyun Sun,Jiaci Chen,Juan Zhang,Xiaoyu Li,Song Qu,Kai Wu,Fengchun Huang,Ailiang Chen
The somatic cell count (SCC) and total plate count (TPC) are essential quality indicators for raw milk. Traditional detection methods require separate measurements and rely on complex, large-scale instruments or cultivation techniques, which are both time-consuming and laborious. To address these challenges, this study developed a novel method for the simultaneous detection of SCC and TPC in the same raw milk sample using the ATP bioluminescence assay. This method utilizes oxy-ethylated iso-nonyl phenol (Neonol-10) and cetyltrimethylammonium bromide (CTAB) to selectively lyse somatic cells and microorganisms, respectively. This technique is straightforward to operate and can be completed within 2.5 h, with detection ranges of 1 × 10⁴ to 3 × 10⁶ cells/mL for SCC and 1 × 10⁵ to 5 × 10⁷ CFU/mL for TPC. Importantly, this technique meets the requirements of detection standards in China, European Union, Canada, United States, etc. For SCC or TPC in raw milk. Overall, this innovative approach does not rely on expensive equipment or facilities and the stepwise reagent addition procedure can be easily developed into an automated high-throughput system for rapid on-site testing of SCC and TPC in raw milk.
研究领域:
乳品科学
·
分析化学
·
微生物学
·
食品安全
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DOI
PubMed
高影响因子
ANALYTICA CHIMICA ACTA
·
2020
·
IF 5.977
Zhi Li,Jiayue Hu,Yongguang Xiao,Qingbing Zha,Lixi Zeng,Mingshan Zhu
Due to their highly porous structures, metal organic framework materials are widely used in analytic areas. In this paper, Cr-metal organic framework (MIL-101(Cr)) modified electrode was prepared and then was used as electrochemical sensor for the detection of bisphenol A (BPA). By using one kind of surfactant of cetyltrimethylammonium bromide (CTAB), the analytic performances of MIL-101 (Cr) towards BPA detection were greatly improved. Compared with pure MIL-101 (Cr), the differential pulse voltammetry (DPV) behavior of CTAB/MIL-101 (Cr) was improved 3.0 times in the presence of BPA. The hydrophobic long chain alkanes of CTAB can improve the enrichment and electrochemical oxidation for BPA. The CTAB/MIL-101 (Cr) sensor exhibited a linear range from 20 to 350 nM and a low detection limit of 9.95 nM (LOD = 3 s b / S ) and showed good reproducibility, stability and selectivity . Finally, real samples of dusts from E-waste recycling area in South China were collected and the CTAB/MIL-101 (Cr) sensor demonstrated satisfactory results for BPA detection from these dust samples.
研究领域:
分析化学
·
环境科学
·
材料科学
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产品关联
DOI
PubMed
高影响因子
Chemosensors
·
2026
·Vol. 14
·期 4
·77
·
IF 4.4
Juan Ma,Hong Li,Siyu Huang,Xiaojing Hu,Tingjuan Xia,Dongyun Zheng
In the present study, an amperometric aflatoxin B1 sensor was constructed via modifying a nano-graphite carbon paste microelectrode with a cationic surfactant of cetyltrimethylammonium bromide (CTAB) and a perfluorosulfonic acid resin of Nafion through a simple and controllable electrochemical scanning method. The experiment results show that CTAB–Nafion composite film has a good catalytic effect on the electrochemical response of aflatoxin B1. The electrocatalytic mechanism was investigated with the aid of different analytical techniques, including square wave voltammetry, electrochemical impedance spectroscopy, chronocoulometry, energy-dispersive spectroscopy and scanning electron microscopy. Under the optimal conditions, the linear range of the sensor is from 0.1 nM to 100 nM, and its detection limit and sensitivity are 20 pM (S/N = 3) and (24.9 ± 1.51) μA/nM, respectively. The accurate and rapid detection of aflatoxin B1, which has strong carcinogenicity, is of great significance for food quality monitoring and the protection of human health. Therefore, finally, the sensor was used to detect the concentration of aflatoxin B1 in milk and soy sauce samples, and the favorable recovery results indicated its good application prospects.
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DOI
高影响因子
SURFACE AND INTERFACE ANALYSIS
·
2025
·
IF 1.8
Huiling Jia,Sen Li,Menghao Liang,Jinxiu Wu,Xin Tan
The cationic surfactant hexadecyltrimethylammonium bromide (CTAB), Ce (NO 3 ) 3 ·6H 2 O, and ammonium nitrate/ethanol mixed solution were used as the mesoporous guiding template, the cerium source, and the selective solvent. PS@ m CeO 2 abrasives were synthesized using polystyrene (PS) as the core and mesoporous ceria ( m CeO 2 ) as the shell. The properties of PS@ m CeO 2 abrasives were examined by field emission scanning electron microscopy (FESEM), Fourier transform infrared (FTIR), small-angle X-ray diffraction (XRD), HRTEM, X-ray photoelectron spectroscopy (XPS), and nitrogen adsorption–desorption. The results showed that m CeO 2 was completely coated on the PS, with the PS core size of 240 nm and the m CeO 2 shell thickness of 15–20 nm. The content of O vacancies and Ce 3+ increased in the m CeO 2 shell. Irregular mesopores were formed in the shell. Young's modulus ( E ) and polishing property of CeO 2 abrasive, PS@CeO 2 composites, and PS@ m CeO 2 composites were measured by atomic force microscopy. The E of core@shell-structured composites significantly decreased. The PS@ m CeO 2 composites reduced mechanical damage and scratches and improved the material removal rate to 172 nm/min.
研究领域:
材料科学
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纳米技术
·
表面科学
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产品关联
DOI
高影响因子
JOURNAL OF MATERIALS CHEMISTRY
·
2012
·Vol. 22
·期 11
·4847-4854
·
IF 5.968
Desong Wang,Yandong Duan,Qingzhi Luo,Xueyan Li,Jing An,Leilei Bao,Lei Shi
A new method for the preparation of mesoporous TiO2 with a surface deposited with nanoparticles of Ag and AgBr was developed. Cetyltrimethylammonium bromide (CTAB) was used as both a template agent and bromine source in the preparation process of the mesoporous TiO2. Mesoporous TiO2 containing CTAB was synthesized by a sol–gel method, and was dipped into AgNO3 solution to form a mesoporous AgBr/TiO2 nanocomposite. The AgBr/TiO2 nanocomposite was irradiated by visible light to accelerate photolysis of AgBr, forming mesoporous Ag/AgBr/TiO2 photocatalyst. The Ag/AgBr/TiO2 photocatalyst was characterized by small angle X-ray diffraction (SAXRD), wide angle X-ray diffraction (WAXRD), transmission electron microscopy (TEM), UV-Vis diffuse reflectance spectroscopy (UV-Vis DRS), X-ray photoelectron spectroscopy (XPS), Auger electron spectroscopy (AES) and N2 isothermal adsorption–desorption. Ag/AgBr/TiO2 exhibits high photocatalytic activity for the degradation of methyl orange under visible light irradiation. The photocatalytic reaction follows the first-order kinetics and the rate constant (k) for the degradation of methyl orange photocatalyzed by Ag/AgBr/TiO2 is 63.6, 36.1 and 2.7 times that of mesoporous TiO2 (M-TiO2), commercial TiO2 (P-25), and Ag/AgBr/SiO2, respectively. The recycling runs experiment shows that the photocatalytic stability of the Ag/AgBr/TiO2 photocatalyst is excellent. The visible light photocatalytic mechanism of Ag/AgBr/TiO2 is also discussed.
研究领域:
材料科学
·
光催化化学
·
纳米材料
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环境功能材料
·
表面科学
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DOI
高影响因子
RSC Advances
·
2014
·Vol. 4
·期 54
·28683-28690
·
IF 3.708
Jie Feng,Zhifei Wang,Bin Shen,Liming Zhang,Xia Yang,Nongyue He
Mesoporous silica-coated Au nanorods (Aurod@SiO2) have recently attracted considerable interest in nanomedicine, and the template removal procedure is crucial for the preparation of such hybrid nanostructure. Herein, two kinds of typical extraction solvents, i.e., NH4NO3–CH3OH and HCl–CH3OH, were separately used to extract the surfactant cetyltrimethylammonium bromide (CTAB) from the obtained Aurod@SiO2. The results show that CTAB molecules could be completely removed from the pores of Aurod@SiO2 without damaging the internal Au nanorod by NH4NO3–CH3OH, while Aurod@SiO2 treated with HCl–CH3OH suffered from both poor extraction efficiency and the shape transformation of Au nanorod due to selective etching in the presence of oxygen. In addition, the consequent drug loading experiment shows that Aurod@SiO2 extracted by NH4NO3–CH3OH possesses a larger drug loading capacity with a loading efficiency of 82.5%. Furthermore, the in vitro photo-thermal therapy experiment shows that Aurod@SiO2 extracted by NH4NO3–CH3OH is more efficient in killing the YCC-2 gastric cancer cells as compared with that extracted by HCl–CH3OH.
研究领域:
纳米医学
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材料科学
·
生物医学工程
·
癌症研究
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产品关联
DOI
高影响因子
Analytical Methods
·
2014
·Vol. 7
·期 2
·708-715
·
IF 1.938
Wenlong Liao,Anyi Chen,Yaling Yang
A simple and effective method based on magnetic solid-phase extraction combined with high performance liquid chromatography was used for the determination of hindered phenolic antioxidants in plastic packaging injections. The extraction and clean-up via Fe3O4@CTAB magnetic adsorbent dispersion in injections was followed by magnetic isolation and desorption of the analytes using acetonitrile. The cationic surfactant cetyltrimethylammonium bromide (CTAB) coated on the surface of Fe3O4 nanoparticles adsorbent was synthesized. The main parameters affecting the adsorption recoveries were evaluated and optimized, including the amounts of surfactant and adsorbent, pH, ionic strength, desorption conditions, and sample volume. Under the optimum conditions, the method was successfully applied to the determination of hindered phenolic antioxidants in plastic packaging injections. Low limits of detection (LODs) of 0.14 and 0.15 µg mL−1 and limits of quantification (LOQs) of 0.45 and 0.50 µg mL−1 were achieved. The mean recoveries were in the range from 85.0% to 93.5% at 5, 10, and 20 µg mL−1 spiked levels, and the relative standard deviations (RSDs) were in the range from 1.16% to 2.81%.
研究领域:
分析化学
·
环境科学
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产品关联
DOI
高影响因子
Small
·
2018
·Vol. 14
·期 31
·1801680
·
IF 9.598
Jiangjiang Zhang,Wenshu Zheng,Xingyu Jiang
Chemical regulation of enzyme-mimic activity of nanomaterials is challenging because it requires a precise understanding of the surface chemistry and mechanism, and rationally designed applications. Herein, Ag + -gated peroxidase activity is demonstrated by successfully modulating surface chemistry of cetyltrimethylammonium bromide-capped gold nanoparticles (CTAB-AuNPs). A surface blocking effect of long-chain molecules on surfaces of AuNPs that inhibit peroxidase activity of AuNPs is found. Ag + ions can selectively bind on the surfaces of AuNPs and competitively destroy CTAB membrane forming Ag + @CTAB-AuNPs complexes to result in enhanced peroxidase activity. Ag + @CTAB-AuNPs show the highest peroxidase activity compared to similar-sized citrate-capped and ascorbic acid-capped AuNPs. Ag + @CTAB-AuNPs can potentially develop into analyte-responsive systems and exhibit advantages in the optical sensing field. For example, the Ag + @CTAB-AuNPs system shows an enhanced sensitivity and selectivity for acetylcholinesterase activity sensing compared to other methods.
研究领域:
纳米生物技术
·
分析化学
·
酶学
·
生物传感器
·
分子诊断
·
转化医学
·
药物代谢
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DOI
高影响因子
Science China-Chemistry
·
2022
·Vol. 65
·期 10
·2023-2030
·
IF 10.138
Liu Mengjun,Zhang Minmin,Chen Jiamei,Yang Ruizhi,Huang Zhaofan,Liu Zhenping,Li Na,Shui Lingling
The sensitive and differential detection of Gram-negative bacteria is essential in food processing, environmental monitoring, and the daily chemical industry. Herein, we propose and validate a liquid crystal (LC)-based aptasensor for the ultrasensitive detection of Escherichia coli ( E. coli ), a model of Gram-negative bacteria. The nematic liquid crystal of 4-cyano-4′-pentylbiphenyl (5CB) molecules can be orderly or disorderly arranged at the LC-aqueous interface via different stimuli, causing changes in optical texture due to birefringence. Bright schlieren texture is observed when a mixture solution of aptamer and hexadecyl trimethyl ammonium bromide (CTAB) is dripped onto the segmented LC films on a copper mesh. The specific binding of aptamers with target bacteria biomarkers liberates the CTAB molecules, which then self-assemble at the LC-aqueous interface to induce the vertical alignment of LCs. An optical transition from bright to dark is therefore achieved via the LC molecular orientation and serves as an aptasensor. Given the prominent affinity and specificity of the aptamer, the established sensitive and selective E. coli assay shows an ultralow detection limit of 27 cfu/mL. The prepared aptasensor can also be applied for the sensitive and selective determination of E. coli in fruit juice, soft drink, and cosmetic products, and shows great promise for the on-site detection of Gram-negative bacteria with high sensitivity and specificity for environmental monitoring, food safety assessment, and household chemical inspection.
研究领域:
生物传感器
·
分析化学
·
微生物学
·
食品科学
·
环境监测
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产品关联
DOI
高影响因子
APPLIED SURFACE SCIENCE
·
2025
·
IF 6.9
Jiale Zhao,Lukai Zhuang,Yang Chen,Xiaodan Zhao,Zhongmin Fang,Jing Zou
Application of the cobalt-based heterogeneous activators for peracetic acid (PAA) activation has attracted significant interests, though the efficacy limitations arise from delayed >Co(II)/>Co(III) redox cycling. The biochar-supported cobalt oxide (C-CoO/BC) composite prepared by cetyl trimithyl ammonium bromide (CTAB) assisted pyrolysis method possesses rich pore structure and surface functional groups, which can effectively promote the >Co(II)/>Co(III) redox cycle. Morphological and structural analyses confirm successful loading of cobalt oxide on biochar. The degradation performance results show that the C-CoO/BC/PAA system can achieve complete degradation of tetracycline (TC) within 5 min under neutral conditions, and exhibits excellent degradation performance in different water matrixes. The C-CoO/BC composite exhibits superior electron transfer performance than CoO and CoO/BC. The negligible influence of different ionic strength on TC abatement indicates the inner-sphere complexation between PAA and C-CoO/BC. The functional groups on the BC surface can continuously activate PAA through the >Co(II)/>Co(III) cycle to generate active species such as organic radical and 1 O 2 , achieving efficient TC abatement. According to the degradation intermediates, the TC degradation process mainly includes ring-opening, dehydroxylation and deamidation reaction with significantly reduced toxicity of the intermediate products. Finally, the system demonstrates strong interference resistance and reusability, as shown by its good TC degradation under varying factors and cyclic application. This study provides an efficient, stable and environmentally friendly technical solution for the treatment of antibiotic pollution in water bodies.
研究领域:
环境科学
·
化学工程
·
水污染控制
·
高级氧化技术
·
材料科学
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DOI
高影响因子
FOOD CHEMISTRY
·
2023
·
IF 8.8
Junmin Ji,Yaxin Zhang,Dan Wang,Yan Wang
The coconut shell-based activated charcoal was decorated by three different electronegativities of surfactants (CTAB, SDS, and Triton X-100) through the impregnation method, and the decorated activated charcoal adsorbents were used for the removal of PAHs from peanut oil, respectively. The influence of surfactant decoration on the adsorption and detoxification effect of coconut shell-based activated charcoal was discussed. The thermodynamic and kinetic behaviors of PAHs adsorption on the surfactant-modified activated charcoal were investigated, and the adsorption mechanism was analyzed in-depth. Notably, the prepared modified coconut shell activated charcoal could not only remove more than 90% of PAHs from the peanut oil but also keep the cytotoxicity of the treated peanut oil low. Meanwhile, the detoxification procedure has little effect on the nutritional quality and flavor of the peanut oil. The results of this fundamental study demonstrate that the low-cost surfactant-modified coconut shell-based activated charcoal was effective and feasible.
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DOI
PubMed
高影响因子
APPLIED SURFACE SCIENCE
·
2015
·
IF 2.711
J. Li,L.X. Chen,X. Li,C.C. Zhang,F.L. Zeng
In this study, a facile and effective surface hydrophobic layer protected selective etching strategy has been adopted to fabricate organic functionalized hollow silica nanospheres (OHSNSs). Our experiments demonstrated that the morphology and structure of OHSNSs were greatly affected by the types of organosilanes and concentrations of cetyltrimethylammonium bromide (CTAB) as pore-making agent. At low concentration of CTAB (1.9 mg/mL −1 ), it was found that the protective effect of the hydrophobic layer of 3-thiocyanatopropyltriethoxysilane (TCPTES) was so strong that can be endured long time etching (8 h), leading to the formation of hollow core and organic porous shell structure. And yet, the protective effect of the hydrophobic layer of vinyltriethoxysilane (VTES) was too weak to withstand alkali etching, resulting in preferentially etched of the outer vinyl protection shell. Whereas, at a higher concentration of CTAB (2.5 mg/mL −1 ), for TCPTES, the irregular and capsules-like spheres were obtained. In contrast, for VTES, porous core/solid shell structures with shell thickness of 16 nm were generated. In addition, no particles were observed when the CTAB concentration was above 2.5 mg/mL −1 .
研究领域:
纳米技术
·
材料科学
·
化学工程
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产品关联
DOI
高影响因子
危险品化学品经营许可证（带存储）