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Xu Z, Jin L, Yang B, Wang W, Yang Y, Wang G, Wu J, Sun D, Ma J. An advanced optic-fiber differential sensing system enhanced by molecularly imprinted polymer for specific sodium benzoate detection. Food Chem 2024; 455:139773. [PMID: 38833856 DOI: 10.1016/j.foodchem.2024.139773] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/20/2024] [Revised: 04/29/2024] [Accepted: 05/19/2024] [Indexed: 06/06/2024]
Abstract
A molecularly imprinted polymer (MIP) based microfiber differential demodulation sensing system for sodium benzoate (SB) concentration detection is proposed. The specific binding of MIP on the surface of microfibers with SB can lead to changes in local refractive index (RI). RI change induces a drift in the interference wavelength, which can be monitored by the power difference between two fiber Bragg gratings (FBGs). The sensing system can detect SB in the concentration range of 0.1-50 μg/ml, and interference wavelength and FBG power difference sensitivities are 0.55 nm/(μg/ml) and 2.64 dB/(μg/ml) in the low concentration range of 0.1-1 μg/ml, respectively, with a limit of detection (LOD) of 0.1 μg/ml. This microfiber differential demodulation sensing system is not only simple to fabricate, but also simplifies the demodulation equipment to reduce the cost, which providing a simple, reliable and low-cost technique for the quantitative detection of SB concentration in beverages and flavoured foods.
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Affiliation(s)
- Ze Xu
- School of Physics and Electronic Engineering, Shanxi University, Taiyuan 030006, China
| | - Li Jin
- School of Physics and Electronic Engineering, Shanxi University, Taiyuan 030006, China
| | - Bowen Yang
- School of Physics and Electronic Engineering, Shanxi University, Taiyuan 030006, China
| | - Wenwen Wang
- School of Physics and Electronic Engineering, Shanxi University, Taiyuan 030006, China
| | - Yukun Yang
- School of Life Science, Shanxi University, Taiyuan 030006, China
| | - Guanjun Wang
- School of Information and Communication Engineering, Hainan University, Haikou 570228, China
| | - Jizhou Wu
- School of Physics and Electronic Engineering, Shanxi University, Taiyuan 030006, China; Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China
| | - Dandan Sun
- School of Physics and Electronic Engineering, Shanxi University, Taiyuan 030006, China.
| | - Jie Ma
- School of Physics and Electronic Engineering, Shanxi University, Taiyuan 030006, China; Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China.
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2
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Wei X, Zhang Z, Li G. Preparation of MIL-101(Cr)-NH 2@TAPB-DVA-COF based membrane solid-phase extraction for efficient enrichment and sensitive determination of trace aromatic disinfection by-products in juice drinks. Talanta 2024; 273:125901. [PMID: 38503122 DOI: 10.1016/j.talanta.2024.125901] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2023] [Revised: 03/05/2024] [Accepted: 03/09/2024] [Indexed: 03/21/2024]
Abstract
Aromatic disinfection by-products (DBPs) have garnered considerable interest in recent years for their potential carcinogenicity. However, efficient separation and enrichment of DBPs in complex samples is a challenge due to the extremely low content of aromatic DBPs and the complexity of sample matrices. In this study, a MIL-101(Cr)-NH2@TAPB-DVA-COF hybrid material was prepared as the enrichment medium of membrane solid-phase extraction (M-SPE) to efficiently determine trace emerging aromatic DBPs. This medium exhibited excellent enrichment capacity and selectivity for aromatic DBPs because of the strong hydrogen bonding, π-π stacking and hydrophobic interactions. An efficient analytical method for five aromatic DBPs in juice drinks was successfully established by use of this hybrid material as the enrichment medium for M-SPE in combination with liquid chromatography tandem mass spectrometry (LC-MS/MS). The limits of detection of the established method were from 0.50 to 3.00 ng/L. Moreover, the method had been successfully used in real juice drinks to determine trace five aromatic DBPs with the spiked recoveries ranging from 84.1% to 125%. The method possessed high analytical sensitivity and accuracy for these five aromatic DBPs in juice drinks with the aid of the efficient M-SPE technology proposed.
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Affiliation(s)
- Xueyun Wei
- School of Chemistry, Sun Yat-Sen University, Guangzhou, 510006, PR China
| | - Zhuomin Zhang
- School of Chemistry, Sun Yat-Sen University, Guangzhou, 510006, PR China.
| | - Gongke Li
- School of Chemistry, Sun Yat-Sen University, Guangzhou, 510006, PR China.
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3
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Huang Q, Gong H, Wang G, Hu W, Wang W, Pan S, Xu J, Liu G, Tian Z. Positively Charged Silver and Gold Nanoparticles with Controllable Size Distribution for SERS Detection of Negatively Charged Molecules. LANGMUIR : THE ACS JOURNAL OF SURFACES AND COLLOIDS 2024; 40:1305-1315. [PMID: 38164750 DOI: 10.1021/acs.langmuir.3c02846] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/03/2024]
Abstract
Surface-enhanced Raman spectroscopy (SERS) has been demonstrated as an ultrasensitive tool for various molecules. However, for the negatively charged molecules, the widely used SERS substrate [negatively charged Ag and Au nanoparticles (Ag or Au NPs (-)] showed either low sensitivity or poor stability. The best solution is to synthesize positively charged silver or gold nanoparticles [Ag or Au NPs (+)] with high stability and excellent SERS performance, which are currently unavailable. To this end, we revitalized the strategy of "charge reversal and seed growth". By selection of ascorbic acid as the reductant and surfactant, the surface charge of Ag or Au NP (-) seeds is adjusted to a balanced state, where the surface charge is negative enough to satisfy the stabilization of the NPs (-) but does not hinder the subsequent charge reversal. By optimization of the chain length and electric charge of polyamine molecules, the highly stable and size-controllable uniform Ag NPs (+) and Au NPs (+) were seed-growth synthesized with high reproducibility. More importantly, the SERS performance of both Ag NPs (+) and Au NPs (+) achieved the trace detection of negatively charged molecules at the level of 1 μg/L, demonstrating an improved SERS sensitivity of up to 3 orders of magnitude compared to the previously reported sensitivity. Promisingly, the introduction of polyamine-capped Ag NPs (+) and Au NPs (+) as SERS substrates with high stability (1 year shelf life) will significantly broaden the application of SERS.
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Affiliation(s)
- Qiuting Huang
- State Key Laboratory of Marine Environmental Science, Fujian Provincial Key Laboratory for Coastal Ecology and Environmental Studies, Center for Marine Environmental Chemistry & Toxicology, College of the Environment and Ecology, Xiamen University, Xiamen 361102, China
| | - Hongbo Gong
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Guoqiang Wang
- State Key Laboratory of Marine Environmental Science, Fujian Provincial Key Laboratory for Coastal Ecology and Environmental Studies, Center for Marine Environmental Chemistry & Toxicology, College of the Environment and Ecology, Xiamen University, Xiamen 361102, China
| | - Weiye Hu
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
| | - Weili Wang
- State Key Laboratory of Marine Environmental Science, Fujian Provincial Key Laboratory for Coastal Ecology and Environmental Studies, Center for Marine Environmental Chemistry & Toxicology, College of the Environment and Ecology, Xiamen University, Xiamen 361102, China
| | - Siqi Pan
- State Key Laboratory of Marine Environmental Science, Fujian Provincial Key Laboratory for Coastal Ecology and Environmental Studies, Center for Marine Environmental Chemistry & Toxicology, College of the Environment and Ecology, Xiamen University, Xiamen 361102, China
| | - Jing Xu
- State Key Laboratory of Marine Environmental Science, Fujian Provincial Key Laboratory for Coastal Ecology and Environmental Studies, Center for Marine Environmental Chemistry & Toxicology, College of the Environment and Ecology, Xiamen University, Xiamen 361102, China
| | - Guokun Liu
- State Key Laboratory of Marine Environmental Science, Fujian Provincial Key Laboratory for Coastal Ecology and Environmental Studies, Center for Marine Environmental Chemistry & Toxicology, College of the Environment and Ecology, Xiamen University, Xiamen 361102, China
| | - Zhongqun Tian
- State Key Laboratory of Physical Chemistry of Solid Surfaces, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen 361005, China
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Maurya P, Verma R. MIP integrated surface plasmon resonance in vitro detection of sodium benzoate. Analyst 2023; 148:1141-1150. [PMID: 36728403 DOI: 10.1039/d2an01910h] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
Food safety is a major concern, with several new diseases arising from unhealthy foods and their composition. Our lifestyle leads us to use ready-to-eat and ready-to-cook foods. The use of preservatives is necessary to make these foods long-lasting. Sodium Benzoate (SB) is one of the most used preservatives in foodstuffs due to its antifungal and antibacterial properties and it also works as a microbial agent. SB keeps foodstuffs fresh and prevents mould and spoilage. The permissible limit of SB is 0-5 mg per kg of body weight per day, which is generally recognized to be safe, as a high intake of SB may increase your risk of inflammation, oxidative stress, obesity, allergies, and disrupting hormones. Therefore, one needs to design a rapid, sensitive, and selective sensor for SB detection. Thus, in this work, we report a Kretschmann-based surface plasmon resonance (SPR) sensor for the detection of SB using the molecularly imprinted polymer (MIP) method over silver-coated SF-11 glass. The wavelength interrogation method was used for the characterization of the Ag/MIP probe. The SPR spectra were blue-shifted with increasing concentrations of SB. The detection range of the sensor is found to be from 0-40 μg ml-1 and the sensor gets saturated beyond these concentrations. The proposed sensor has high sensitivity and a high figure of merit (FOM) at low concentrations, with these parameters decreasing with increasing SB concentration. The sensor is highly selective for SB as it does not respond to the other chemical compounds we tested, - atrazine, melamine and chitosan. The limit of detection of the sensor is found to be 0.083 μg ml-1, which is very low compared to other reported methods for SB sensing. The FOM is recorded as 0.026 (μg ml-1)-1 for 4 μg ml-1 concentration. This sensor works within the permissible limit and beyond for SB. This sensor can be utilized for the detection of traces of SB in packed food/juice, pickles, drinks, wines, sauces, and ready-to-cook foodstuffs, and also in personal care products: serums, toothpaste etc. This sensor is cost-effective, highly selective, reliable, easy to handle and has the advantage of online monitoring.
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Affiliation(s)
| | - Roli Verma
- Department Of Physics, University of Lucknow, India.
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Zhang H, Zeng P, Guan Q, Yan X, Yu L, Wu G, Hong Y, Wang C. Combining thin-film microextraction and surface enhanced Raman spectroscopy to sensitively detect thiram based on 3D silver nanonetworks. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2023; 287:122073. [PMID: 36399817 DOI: 10.1016/j.saa.2022.122073] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2022] [Revised: 10/25/2022] [Accepted: 11/01/2022] [Indexed: 06/16/2023]
Abstract
By coupling thin-film microextraction (TFME) with surface enhanced Raman scattering (SERS), a facile method was developed for the determination of thiram in the complex matrix (orange juice or grape peel). The substrate of TFME was made by self-assembling silver sol on the silicon wafer to form a three-dimensional (3D) silver nanonetwork structure, without adding any template, which was used for TFME and SERS detection, respectively. The substrate exhibits high reproducibility with a relative standard deviation of about 7.32 % in spot and spot SERS intensity. The SERS signal intensity at a shift of 1384 cm-1 and the thiram concentration showed good linearity in the range of 0.01-5 µg/L and the linear correlation coefficient was 0.9912. The detection limit for thiram was found to be 0.01 µg/L. The TFME-SERS method was applied for the determination of thiram in fruit juice and the results were obtained very well. Therefore, this method is expected to play a role in the detection of trace pollutants.
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Affiliation(s)
- Huan Zhang
- School of Food Science & Engineering, Jiangxi Agricultural University, Nanchang 330045, People's Republic of China
| | - Pei Zeng
- School of Food Science & Engineering, Jiangxi Agricultural University, Nanchang 330045, People's Republic of China
| | - Qi Guan
- School of Food Science & Engineering, Jiangxi Agricultural University, Nanchang 330045, People's Republic of China
| | - Xianzai Yan
- School of Food Science & Engineering, Jiangxi Agricultural University, Nanchang 330045, People's Republic of China
| | - Lili Yu
- School of Food Science & Engineering, Jiangxi Agricultural University, Nanchang 330045, People's Republic of China
| | - Guoping Wu
- School of Food Science & Engineering, Jiangxi Agricultural University, Nanchang 330045, People's Republic of China
| | - Yanping Hong
- School of Food Science & Engineering, Jiangxi Agricultural University, Nanchang 330045, People's Republic of China
| | - Chunrong Wang
- School of Food Science & Engineering, Jiangxi Agricultural University, Nanchang 330045, People's Republic of China.
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6
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Mohammadi M, Khosravi S, Nili-Ahmadabadi A, Kamalabadi M, Ghasemzadeh-Mohammadi V, Afkhami A. Rapid determination of ampyra in urine samples using dispersive liquid-liquid microextraction coupled with ion mobility spectrometry. J Pharm Biomed Anal 2023; 224:115185. [PMID: 36516725 DOI: 10.1016/j.jpba.2022.115185] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/13/2022] [Revised: 11/22/2022] [Accepted: 11/23/2022] [Indexed: 12/03/2022]
Abstract
Ampyra (AMP, 4-Aminopyridine) is a potassium channel blocker that attracts growing research interest due to its adverse effects at high doses. The fast analysis of AMP is challenging because it typically requires complex analytical techniques. In this research, we developed and validated a novel method to assess the fast and quantitative analysis of AMP from real samples. This method combines the strength of ion mobility spectrometry (IMS) for rapid detection and the dispersive liquid-liquid microextraction as a fast and effective preconcentration method for the preconcentration/extraction of AMP. In this method, Ag nanoparticles were used as modifier agents. Moreover, the proposed mechanism for interaction of AMP with AgNPs was investigated based on the quantum theory of atoms in molecules (QTAIM) analysis. Also, the sensitivity of the proposed method was improved through the application of a delay on the carrier gas flow after sample injection. Under the optimum conditions, the developed method detected AMP in the linear range of 0.4-16 μmol L-1 with a detection limit of 0.12 µmol L-1. Finally, the developed method was successfully employed to quantify AMP in urine samples. Method validation was performed by comparing our results with those obtained by HPLC-UV/Vis, confirming the applicability of the proposed method for the AMP analysis in real samples. The proposed method will open up a new door toward developing simple, fast, and effective analytical methods.
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Affiliation(s)
- Mojdeh Mohammadi
- Department of Pharmacology and Toxicology, School of Pharmacy, Hamadan University of Medical Sciences, Hamadan, Iran
| | - Sara Khosravi
- Department of Pharmacology and Toxicology, School of Pharmacy, Hamadan University of Medical Sciences, Hamadan, Iran
| | - Amir Nili-Ahmadabadi
- Department of Pharmacology and Toxicology, School of Pharmacy, Hamadan University of Medical Sciences, Hamadan, Iran
| | - Mahdie Kamalabadi
- Department of Pharmacology and Toxicology, School of Pharmacy, Hamadan University of Medical Sciences, Hamadan, Iran.
| | | | - Abbas Afkhami
- Faculty of Chemistry, Bu-Ali Sina University, Hamadan, Iran
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7
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Jing X, Wu J, Wang H, Feng J, Zheng X, Wang X, Wang S. Bio-derived solvent-based dispersive liquid-liquid microextraction followed by smartphone digital image colorimetry for the detection of carbofuran in cereals. J Food Compost Anal 2022. [DOI: 10.1016/j.jfca.2022.104782] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
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8
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Tian T, Zhang WY, Zhou HY, Peng LJ, Zhou X, Zhang H, Yang FQ. A Catechol-Meter Based on Conventional Personal Glucose Meter for Portable Detection of Tyrosinase and Sodium Benzoate. BIOSENSORS 2022; 12:bios12121084. [PMID: 36551051 PMCID: PMC9776396 DOI: 10.3390/bios12121084] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/25/2022] [Revised: 11/22/2022] [Accepted: 11/24/2022] [Indexed: 05/28/2023]
Abstract
In this study, the personal glucose meter (PGM) was first used as a fast and user-friendly meter for analyzing catechol (CA) based on the reduction of the mediator K3[Fe(CN)6] to K4[Fe(CN)6] in the glucose test strip. Then, an easy, low-cost, and convenient PGM-based method for detecting tyrosinase (TYR) activity and sodium benzoate (SBA) was developed on the basis of the TYR-catalyzed reaction. In this method, CA is oxidized to form o-benzoquinone by TYR, thereby reducing the residual amount of CA and the PGM readout. On the other hand, SBA can inhibit the oxidation of CA catalyzed by TYR and increase the residual amount of CA after the enzymatic reaction. Therefore, the activity of TYR is proportional to the difference in the PGM readout of CA, and the concentration of SBA is positively correlated with the residual amount of CA. After the relevant experimental conditions were systematically optimized, the proposed PGM-based method for the detection of TYR and SBA was successfully validated. The liner ranges are 1.0-103.3 U/mL and 6.25-1000 ppm, and the quantification limits are 1.0 U/mL and 6.25 ppm for TYR and SBA, respectively. Moreover, the spiked recovery tests in normal human serum and carbonate beverages (i.e., Cola, Sprite, and Fanta) were performed, and the recoveries (91.6-106.8%) further confirm the applicability of the PGM-based method in real sample analysis.
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Affiliation(s)
- Tao Tian
- Chongqing Key Laboratory of High Active Traditional Chinese Drug Delivery System, Chongqing Medical and Pharmaceutical College, Chongqing 401331, China
- School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 401331, China
| | - Wei-Yi Zhang
- School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 401331, China
| | - Hang-Yu Zhou
- School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 401331, China
| | - Li-Jing Peng
- School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 401331, China
| | - Xi Zhou
- School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 401331, China
| | - Hao Zhang
- Chongqing Key Laboratory of High Active Traditional Chinese Drug Delivery System, Chongqing Medical and Pharmaceutical College, Chongqing 401331, China
| | - Feng-Qing Yang
- School of Chemistry and Chemical Engineering, Chongqing University, Chongqing 401331, China
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Zhang H, Yang H, Liu P, Qin X, Liu G. Colorimetric quantification of sodium benzoate in food by using d-amino acid oxidase and 2D metal organic framework nanosheets mediated cascade enzyme reactions. Talanta 2022; 237:122906. [PMID: 34736643 DOI: 10.1016/j.talanta.2021.122906] [Citation(s) in RCA: 14] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2021] [Revised: 07/16/2021] [Accepted: 09/25/2021] [Indexed: 01/06/2023]
Abstract
A rapid colorimetric method for detecting sodium benzoate in food products was established based on the d-amino acid oxidase (DAAO) and 2D metal organic framework (2D MOF) nanosheets mediated cascade enzyme reactions. Firstly, the synthesized 2D MOF nanosheets served as high efficient nanozyme with outstanding peroxidase-like catalytic activity and catalyzed the color reaction between H2O2 and 3, 3', 5, 5'- tetramethylbenzidine. Secondly, sodium benzoate as a competitive inhibitor of DAAO, could influence the production of H2O2 in DAAO mediated oxidation reaction. After a combination of those two reactions, this colorimetric quantitative method was constructed and validated for sodium benzoate determination with wide linear range (2.0-200.0 μM), low limit of detection (2.0 μM), high accuracy (recovery rate in 95.80-108.00%) and satisfied selectivity. Lastly, this method was utilized to analyze sodium benzoate concentration in juice, wine and vinegar by naked eyes.
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Affiliation(s)
- Haizhi Zhang
- College of Food Science and Engineering, Wuhan Polytechnic University, Wuhan, 430023, China.
| | - Huanyu Yang
- College of Food Science and Engineering, Wuhan Polytechnic University, Wuhan, 430023, China
| | - Pei Liu
- College of Food Science and Engineering, Wuhan Polytechnic University, Wuhan, 430023, China
| | - Xinguang Qin
- College of Food Science and Engineering, Wuhan Polytechnic University, Wuhan, 430023, China
| | - Gang Liu
- College of Food Science and Engineering, Wuhan Polytechnic University, Wuhan, 430023, China.
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10
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From lab to field: Surface-enhanced Raman scattering-based sensing strategies for on-site analysis. Trends Analyt Chem 2022. [DOI: 10.1016/j.trac.2021.116488] [Citation(s) in RCA: 10] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/18/2022]
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11
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Dummy template based molecularly imprinted solid-phase microextraction coating for analysis of trace disinfection by-product of 2,6-dichloro-1,4-benzoquinone using high-performance liquid chromatography. Talanta 2021; 239:123065. [PMID: 34875523 DOI: 10.1016/j.talanta.2021.123065] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/19/2021] [Revised: 11/09/2021] [Accepted: 11/12/2021] [Indexed: 12/19/2022]
Abstract
Trace disinfection by-products (DBPs) produced during the disinfection of drinking water are potentially carcinogenic, teratogenic and mutagenic, which has aroused much attention recently. In this study, a molecularly imprinted (MIP) solid -phase microextraction (SPME) fiber coating was prepared by an in-situ polymerization method using a dummy template molecule for the analysis of trace 2,6-dichloroindole-1,4-benzoquinone (2,6-DCBQ), a typical DBP. The characterization results suggested that this monolithic SPME fiber under the optimized conditions had the porous structure, large surface area and good thermal stability. Due to the strong structural recognition and molecular interaction between MIP SPME coating and target molecule, it showed good extraction selectivity and capacity to trace 2,6-DCBQ with an imprinting factor of 4.7. Then, coupling with high-performance liquid chromatography (HPLC)-ultraviolet (UV) detection, a sensitive analytical method for trace 2,6-DCBQ in water samples was successfully established with a detection limit down to 2.3 ng/mL. The recoveries of the proposed method were in range of 84.4-122% with the relative standard deviations of 1.0-13% (n = 3). The results showed that this MIP SPME-HPLC-UV method possessed high analytical selectivity and sensitivity for trace 2,6-DCBQ in water, which would benefit the improvement of the practicability of DBPs monitoring and detection methodology.
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Ko CH, Liu CC, Chen KH, Sheu F, Fu LM, Chen SJ. Microfluidic colorimetric analysis system for sodium benzoate detection in foods. Food Chem 2020; 345:128773. [PMID: 33302108 DOI: 10.1016/j.foodchem.2020.128773] [Citation(s) in RCA: 17] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/30/2020] [Revised: 11/09/2020] [Accepted: 11/28/2020] [Indexed: 12/11/2022]
Abstract
Sodium benzoate (SBA) is a widely-used additive for preventing food spoilage and deterioration and extending the shelf life. However, the concentration of SBA must be controlled under safe regulations to avoid damaging human health. Accordingly, this study proposes a microfluidic colorimetric analysis (MCA) system composing of a wax-printed paper-microchip and a self-made smart analysis equipment for the concentration detection of SBA in common foods and beverages. In the presented method, the distilled SBA sample is mixed with NaOH to obtain a nitro compound and the compound is then dripped onto the reaction area of the paper-microchip, which is embedded with two layers of reagents (namely acetophenone and acetone). The paper-microchip is heated at 120 °C for 20 min to cause a colorimetric reaction and the reaction image is then obtained through a CMOS (complementary metal oxide semiconductor) device and transmitted to a cell-phone over a WiFi connection. Finally, use the self-developed RGB analysis software installed on the cell-phone to obtain the SBA concentration. A calibration curve is constructed using SBA samples with known concentrations ranging from 50 ppm (0.35 mM) to 5000 ppm (35 mM). It is shown that the R + G + B value (Y) of the reaction image and SBA concentration (X) are related via Y = -0.034 X +737.40, with a determination coefficient of R2 = 0.9970. By measuring the SBA concentration of 15 commercially available food and beverage products, the actual feasibility of the current MCA system can be demonstrated. The results show that the difference from the measurement results obtained using the macroscale HPLC method does not exceed 6.0%. Overall, the current system provides a reliable and low-cost technique for quantifying the SBA concentration in food and drink products.
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Affiliation(s)
- Chien-Hsuan Ko
- Department of Engineering Science, National Cheng Kung University, Tainan 70101, Taiwan
| | - Chan-Chiung Liu
- Department of Food Science, National Pingtung University of Science and Technology, Pingtung 91201, Taiwan
| | - Kuan-Hong Chen
- Department of Horticulture and Landscape Architecture, National Taiwan University, Taipei 10617, Taiwan
| | - Fuu Sheu
- Department of Horticulture and Landscape Architecture, National Taiwan University, Taipei 10617, Taiwan; Center for Biotechnology, National Taiwan University, Taipei 10617, Taiwan
| | - Lung-Ming Fu
- Department of Engineering Science, National Cheng Kung University, Tainan 70101, Taiwan; Graduate Institute of Materials Engineering, National Pingtung University of Science and Technology, Pingtung 912, Taiwan.
| | - Szu-Jui Chen
- Department of Engineering Science, National Cheng Kung University, Tainan 70101, Taiwan; Graduate Institute of Materials Engineering, National Pingtung University of Science and Technology, Pingtung 912, Taiwan
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13
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Li M, Cao R, Dyett B, Zhang X. Encapsulated Nanodroplets for Enhanced Fluorescence Detection by Nano-Extraction. SMALL (WEINHEIM AN DER BERGSTRASSE, GERMANY) 2020; 16:e2004162. [PMID: 33103337 DOI: 10.1002/smll.202004162] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/09/2020] [Revised: 09/18/2020] [Indexed: 05/21/2023]
Abstract
Enhancement of the detection signal of fluorescence microscopy in highly diluted solutions is of great importance in chemical analysis, sensing, and bioassay applications. Surface nanodroplets with atto- to femto-liter volumes are promising tools for sensitive online detection by integrating their extremely efficient nano-extraction and optical advantages. In this paper, the development of novel basic units of nanodroplets-in-a-microdroplet by simple solvent exchange is reported. The encapsulated nanodroplets are applied for ultrasensitive and online detection in fluorescence imaging. The biphasic nature of the droplet composite enables simultaneous extraction and enrichment of both hydrophobic and hydrophilic compounds. Furthermore, the desirable lensing effect of the curved surface of the nanodroplets enhances the collection of light emitted from the fluorophore extracted in the droplets by ≈60-fold, allowing sensitive and quantitative analysis of the fluorophore using fluorescence microscopy. The results highlight the potential of encapsulated nanodroplets as a simple and innovative method of signal enhancement in chemical analysis. By integrating selective concentration, extraction, and sensitive detection, the encapsulated nanodroplets reported here may have broad applications in many chemical and biological matrices.
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Affiliation(s)
- Miaosi Li
- School of Chemistry and Chemical Engineering, South China University of Technology, Guangzhou, 510640, China
- Guangzhou New Chemical Material Technology Ltd., Guangzhou, 510640, China
| | - Rong Cao
- Key Laboratory of Tropical Translational Medicine of Ministry of Education and Hainan Provincial Key Laboratory of Tropical Medicine, Hainan Medical University, Haikou, 571199, China
| | - Brendan Dyett
- School of Science, RMIT University, Melbourne, Victoria, 3001, Australia
| | - Xuehua Zhang
- Department of Chemical and Materials Engineering, University of Alberta, Alberta, T6G 1H9, Canada
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Lin D, Tsai C, Huang Y, Ye S, Lin C, Lee K, Wu M. Novel strategy for food safety risk management and communication: Risk identification for benzoic acid residues in pickled vegetables. Food Sci Nutr 2020; 8:5419-5425. [PMID: 33133544 PMCID: PMC7590341 DOI: 10.1002/fsn3.1839] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/09/2020] [Revised: 07/26/2020] [Accepted: 07/27/2020] [Indexed: 01/05/2023] Open
Abstract
Benzoic acid (BA) is widely used as an antimicrobial preservative to prolong the shelf-life of pickled vegetables. A method for rapidly determining the BA content in forty pickled vegetable samples was developed by coupling ultrasonic extraction with surface-enhanced Raman scattering (SERS) and an adaptive iteratively reweighted penalized least-squares (AirPLS) algorithm. The results obtained with this method were compared and correlated with those from high-performance liquid chromatography measurements. Amplification of the Raman scattering via the SERS effect was induced by gold nanoparticles (AuNPs) when BA was irradiated with a 785 nm laser. The AirPLS algorithm was used to reduce the background interference signal, which was also amplified. The amplified Raman scattering effect of BA in the pickled vegetables displayed a positive and significant correlation with the HPLC concentration of BA, with high reproducibility. For HPLC determination of the concentration of BA in the range of 0-820 ppm, the BA monomer's intensity of the 944-1,005 cm-1 and 1,366-1,373 cm-1 peaks, and BA dimer's intensity of the 1,025 cm-1 and 1,465-1,482 cm-1 peaks in the SERS spectrum were respectively converted to the Z-ratio BA monomer and Z-ratio BA dimer standard scores by Z-Score conversion. The sum's (Z-ratio BA monomer + Z-ratio BA dimer) sensitivity was 100%, and specificity was 90.9% by receiver operating characteristic curve. This study found that a Raman spectroscopy-based monitoring method can be one of the fastest screening inspection options that can complete an analysis within a short period of time and produce reliable results. This approach is particularly cost-effective, which makes it suitable for the initial screening of raw materials and provides an effective management strategy easy to communicate with food safety officials.
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Affiliation(s)
- Ding‐Yan Lin
- Institute of Food Safety ManagementNational Pingtung University of Science and TechnologyPingtungTaiwan
| | - Cheng‐Han Tsai
- Chiayi County Health Bureau Laboratory SectionChiayiTaiwan
| | - Ying Huang
- Chiayi County Health Bureau Laboratory SectionChiayiTaiwan
| | - Siou‐Bang Ye
- Institute of Food Safety ManagementNational Pingtung University of Science and TechnologyPingtungTaiwan
- Chiayi County Health Bureau Laboratory SectionChiayiTaiwan
| | - Che‐Hsuan Lin
- Chiayi County Health Bureau Laboratory SectionChiayiTaiwan
| | - Ku‐Yuan Lee
- College of IntelligenceNational Taichung University of Science and TechnologyTaichung CityTaiwan
| | - Min‐Hua Wu
- Institute of Food Safety ManagementNational Pingtung University of Science and TechnologyPingtungTaiwan
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15
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Bodur S, Borahan T, Ates N, Bakırdere S. Sensitive Determination of Acetochlor, Alachlor, Metolachlor and Fenthion Utilizing Mechanical Shaking Assisted Dispersive Liquid-Liquid Microextraction Prior to Gas Chromatography-Mass Spectrometry. BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY 2020; 105:460-467. [PMID: 32839840 DOI: 10.1007/s00128-020-02965-z] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/05/2020] [Accepted: 08/13/2020] [Indexed: 06/11/2023]
Abstract
A green, sensitive and accurate dispersive liquid-liquid microextraction (DLLME) method was used to preconcentrate four selected pesticides in dam lake water samples for determination by gas chromatography-mass spectrometry (GC-MS). Conditions of the DLLME method were comprehensively investigated and optimized according to type/volume of extraction solvent, type/volume of dispersive solvent, and type/period of mixing. The developed method was validated according to the limits of detection and quantitation, accuracy, precision and linearity. Under the optimum conditions, limit of detection values calculated for alachlor, acetochlor, metolachlor and fenthion were 1.7, 1.7, 0.2 and 7.8 µg/kg (mass based), respectively. The method recorded 202, 104, 275 and 165 folds improvement in detection power values for acetochlor, alachlor, metolachlor and fenthion, respectively, when compared with direct GC-MS measurements. In order to evaluate the accuracy of the developed method, real sample application with spiking experiments was performed on dam lake water samples, and satisfactory percent recovery results in the range of 81%-120% were obtained.
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Affiliation(s)
- Süleyman Bodur
- Chemistry Department, Yıldız Technical University, 34210, Istanbul, Turkey
| | - Tülay Borahan
- Chemistry Department, Yıldız Technical University, 34210, Istanbul, Turkey
| | - Nuray Ates
- Environmental Engineering Department, Engineering Faculty, Erciyes University, 38039, Kayseri, Turkey.
| | - Sezgin Bakırdere
- Chemistry Department, Yıldız Technical University, 34210, Istanbul, Turkey.
- Turkish Academy of Sciences (TÜBA), Piyade Street No: 27, Çankaya, 06690, Ankara, Turkey.
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16
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Molecular complex based dispersive liquid–liquid microextraction for simultaneous HPLC determination of eight phenolic compounds in water samples. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.113115] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/31/2022]
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17
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Terzioğlu D, Dalgıç Bozyiğit G, Fırat Ayyıldız M, Chormey DS, Bakırdere S. Combination of Slotted Quartz Tube Flame Atomic Absorption Spectrometry and Dispersive Liquid–Liquid Microextraction for the Trace Determination of Silver in Electroplating Rinse Bath. ANAL LETT 2020. [DOI: 10.1080/00032719.2020.1780603] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
Affiliation(s)
- Duygu Terzioğlu
- Department of Chemistry, Yıldız Technical University, İstanbul, Turkey
| | - Gamze Dalgıç Bozyiğit
- Faculty of Civil Engineering, Department of Environmental Engineering, Yıldız Technical University, İstanbul, Turkey
| | | | | | - Sezgin Bakırdere
- Department of Chemistry, Yıldız Technical University, İstanbul, Turkey
- Turkish Academy of Sciences (TÜBA), Ankara, Turkey
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18
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Xie Q, Cao J, Sun D, Lu H, Xia M, Hou B, Li D, Jia L. Determination of aqueous bisphenol A and tetrabromobisphenol A using molecular-complex-based liquid-liquid microextraction. J Mol Liq 2020. [DOI: 10.1016/j.molliq.2020.112501] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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19
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Majeed SA. Combining microextraction methods with surface-enhanced Raman spectroscopy towards more selective and sensitive analyte detection by plasmonic metal nanoparticles. Analyst 2020; 145:6744-6752. [DOI: 10.1039/d0an01304h] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
Raman signals of analytes can be enhanced on the surface of noble nanoparticles by generating SERS signals, which can be further enhanced using microextraction (ME) techniques.
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