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Hernandez-Gonzalez H, Paez-Hernandez ME, Pérez-Silva I, Miranda JM, Mondragon A, Islas G, Ibarra IS. Development, synthesis, and application of magnetic layered double hydroxides (Fe 3O 4@SiO-LDH/DS -) as an efficient adsorbent for the removal of tetracyclines from milk samples. J Chromatogr A 2024; 1729:465035. [PMID: 38851029 DOI: 10.1016/j.chroma.2024.465035] [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: 02/23/2024] [Revised: 05/14/2024] [Accepted: 05/28/2024] [Indexed: 06/10/2024]
Abstract
This work presents the development, synthesis, and application of a layered double hydroxide (LDH) coupled to magnetic particles for the removal of antibiotics as tetracyclines (TC´s): tetracycline (TC), chlortetracycline (CT), oxytetracycline (OT), and doxycycline (DT) from milk samples. The LDH synthesis conditions, reaction time (30-90 min), molar ratios Mg2+/Al3+ (7:1-1:7), interlayer anion (NO3-, Cl-, CO32-, and dodecyl sulphate (DS-)) were evaluated. Under synthesis conditions (reaction time of 30 min, Mg2+/Al3+ molar ratio of 7:1, and DS- as interlayer anion), the LDH was coupled in a magnetic solid phase microextraction (MSPμE) methodology. At the optimal extraction conditions (pH 6, 5 min of contact time, 10 mg of adsorbent), a removal percentage of 99.0 % was obtained for each tetracycline. FTIR, TGA, SEM, and adsorption isotherms were employed to characterize the optimal adsorbent. Each experiment was corroborated by large-volume sample stacking capillary electrophoresis (LVSS-CE). The adsorbent was applied directly to positive milk samples (previously tested) for TC´s removal.
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Affiliation(s)
- H Hernandez-Gonzalez
- Area Academica de Quimica, Universidad Autonoma del Estado de Hidalgo, Carr. Pachuca- Tulancingo km 4.5, 42184 Mineral de la Reforma, Hgo, Mexico
| | - M E Paez-Hernandez
- Area Academica de Quimica, Universidad Autonoma del Estado de Hidalgo, Carr. Pachuca- Tulancingo km 4.5, 42184 Mineral de la Reforma, Hgo, Mexico
| | - I Pérez-Silva
- Area Academica de Quimica, Universidad Autonoma del Estado de Hidalgo, Carr. Pachuca- Tulancingo km 4.5, 42184 Mineral de la Reforma, Hgo, Mexico
| | - J M Miranda
- Laboratorio de Higiene, Inspeccion y Control de Alimentos, Departamento de Química Analitica, Nutricion y Bromatologia, Facultad de Veterinaria, Universidad de Santiago de Compostela, 27002 Lugo, Spain
| | - A Mondragon
- Laboratorio de Higiene, Inspeccion y Control de Alimentos, Departamento de Química Analitica, Nutricion y Bromatologia, Facultad de Veterinaria, Universidad de Santiago de Compostela, 27002 Lugo, Spain
| | - G Islas
- Area Academica de Quimica, Universidad Autonoma del Estado de Hidalgo, Carr. Pachuca- Tulancingo km 4.5, 42184 Mineral de la Reforma, Hgo, Mexico; Universidad Politecnica de Francisco I. Madero, Area de Ingenieria Agroindustrial, Domicilio Conocido, 42640 Tepatepec, Hgo, Mexico
| | - I S Ibarra
- Area Academica de Quimica, Universidad Autonoma del Estado de Hidalgo, Carr. Pachuca- Tulancingo km 4.5, 42184 Mineral de la Reforma, Hgo, Mexico.
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Jiao Y, Yi Y, Fang Z, Eric Tsang P. Selective removal of oxytetracycline by molecularly imprinted magnetic biochar. BIORESOURCE TECHNOLOGY 2024; 395:130394. [PMID: 38301940 DOI: 10.1016/j.biortech.2024.130394] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/14/2023] [Revised: 01/22/2024] [Accepted: 01/25/2024] [Indexed: 02/03/2024]
Abstract
Molecularly imprinted magnetic biochar (MBC@MIPs) was synthesized through molecular imprinting precipitation polymerization. This material demonstrated a selective adsorption capacity of oxytetracycline (OTC) from water samples. Upon characterization of MBC@MIPs, results revealed the formation of a memory cavity shell layer on the magnetic biochar's surface, exhibiting a distinctive recognition effect alongside commendable magnetic and thermal stability. Analysis of the adsorption kinetics indicated that the OTC adsorption process aligned well with the pseudo-second-order rate equation, with chemisorption acting as the predominant mechanism for antibiotic adsorption onto MBC@MIPs. The data could be well described by the Langmuir isotherm model. At 299 K, MBC@MIPs showed a maximum binding capacity of 67.89 mg·g-1, surpassing that of MBC (38.84 mg·g-1) by 1.77 times. MBC@MIPs exhibited the highest selectivity towards OTC, with an imprinting factor (IF) of 5.64. Even amidst interference from antibiotics, MBC@MIPs maintained a significant adsorption capacity for OTC (6.10 mg·g-1), with IF of 6.70.
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Affiliation(s)
- Yuhan Jiao
- School of Environment, South China Normal University, Guangzhou, 510006, China; Normal University (Qingyuan) Environmental Remediation Technology Co., Ltd., Qingyuan 511500, China
| | - Yunqiang Yi
- Normal University (Qingyuan) Environmental Remediation Technology Co., Ltd., Qingyuan 511500, China; Guangdong Technology Research Center for Ecological Management and Remediation of Water System, Guangzhou 510006, China; College of Resources and Environment, Zhongkai University of Agriculture and Engineering, Guangzhou 510006, China
| | - Zhanqiang Fang
- School of Environment, South China Normal University, Guangzhou, 510006, China; Normal University (Qingyuan) Environmental Remediation Technology Co., Ltd., Qingyuan 511500, China; Guangdong Technology Research Center for Ecological Management and Remediation of Water System, Guangzhou 510006, China.
| | - Pokeung Eric Tsang
- Department of Science and Environmental Studies, The Education University of Hong Kong, 00852, Hong Kong, China
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Li H, Yin Z, Zhang Y, Yang J, Ding Y, Wang S, Pan M. Computational simulation-assisted design and experimental verification of molecularly imprinted polymers for selective extraction of chlorogenic acid. J Chromatogr A 2024; 1714:464556. [PMID: 38056394 DOI: 10.1016/j.chroma.2023.464556] [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: 07/01/2023] [Revised: 11/28/2023] [Accepted: 12/01/2023] [Indexed: 12/08/2023]
Abstract
Chlorogenic acid (CGA) is an active ingredient in honeysuckle with a broad-spectrum of antibacterial activity, suppressing tumor growth and other pharmacological effects. However, it is susceptible to damage during traditional extraction and separation processes. Therefore, developing selective and efficient extraction methods of CGA is essential. Based on computational molecular simulations, a reliable and efficient molecularly imprinted polymers (MIPs) were successfully developed for selective extraction of CGA. MIPs and non-molecularly imprinted polymers (NIPs) were synthesized using a precipitation polymerization method, employing three different functional monomers: [methacrylic acid (MAA), 4-vinylpyridine (4-VP), and methyl methacrylate (MMA)], with CGA serving as the template molecule. To simulate the polymers and predict the optimal ratio between the template and functional monomer, the computational studies and adsorption performance experiments were carried out. The adsorption characteristics and thermal stability of polymers were evaluated by isothermal adsorption, adsorption kinetics, selective adsorption and thermogravimetric analysis, aiming to obtain the MIPs with specific recognition and selectivity for CGA. When the molar ratio of template CGA to functional monomer 4-VP was 1:8, the prepared MIPs was found to have the maximum adsorption capacity (14.85 mg g-1) and the highest imprinting factor (1.74) at the CGA concentration of 100 mg L-1. These results were consistent with those obtained by computational molecular simulation. This study not only provides good guidance for developing separation materials for extracting CGA from natural plants but also inspires the application of computer simulation and molecular docking techniques in the preparation of specific MIPs materials.
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Affiliation(s)
- Huilin Li
- State Key Laboratory of Food Nutrition and Safety, Tianjin University of Science and Technology, Tianjin 300457, China; Key Laboratory of Food Quality and Health of Tianjin, Tianjin University of Science & Technology, 300457 Tianjin, China
| | - Zongjia Yin
- State Key Laboratory of Food Nutrition and Safety, Tianjin University of Science and Technology, Tianjin 300457, China; Key Laboratory of Food Quality and Health of Tianjin, Tianjin University of Science & Technology, 300457 Tianjin, China
| | - Yihua Zhang
- State Key Laboratory of Food Nutrition and Safety, Tianjin University of Science and Technology, Tianjin 300457, China; Key Laboratory of Food Quality and Health of Tianjin, Tianjin University of Science & Technology, 300457 Tianjin, China
| | - Jingying Yang
- State Key Laboratory of Food Nutrition and Safety, Tianjin University of Science and Technology, Tianjin 300457, China; Key Laboratory of Food Quality and Health of Tianjin, Tianjin University of Science & Technology, 300457 Tianjin, China
| | - Yumei Ding
- State Key Laboratory of Food Nutrition and Safety, Tianjin University of Science and Technology, Tianjin 300457, China; Key Laboratory of Food Quality and Health of Tianjin, Tianjin University of Science & Technology, 300457 Tianjin, China
| | - Shuo Wang
- State Key Laboratory of Food Nutrition and Safety, Tianjin University of Science and Technology, Tianjin 300457, China; Key Laboratory of Food Quality and Health of Tianjin, Tianjin University of Science & Technology, 300457 Tianjin, China.
| | - Mingfei Pan
- State Key Laboratory of Food Nutrition and Safety, Tianjin University of Science and Technology, Tianjin 300457, China; Key Laboratory of Food Quality and Health of Tianjin, Tianjin University of Science & Technology, 300457 Tianjin, China.
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Zhang L, Mo H, Wang C, Li X, Jiang S, Fan W, Zhang Y. Synthesis and Properties of Cefixime Core-Shell Magnetic Nano-Molecularly Imprinted Materials. Polymers (Basel) 2023; 15:4464. [PMID: 38006188 PMCID: PMC10674183 DOI: 10.3390/polym15224464] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/12/2023] [Revised: 11/12/2023] [Accepted: 11/14/2023] [Indexed: 11/26/2023] Open
Abstract
Novel core-shell magnetic molecularly imprinted polymers (MMIPs) were synthesized using the sol-gel method for the adsorption of cefixime (CFX). Fe3O4@SiO2 is the core, and molecularly imprinted polymers (MIPs) are the shell, which can selectively interact with CFX. The preparation conditions, adsorption kinetics, adsorption isotherms, selective adsorption ability, and reutilization performance of the MMIPs were investigated. The adsorption capacity of MMIPs for CFX was 111.38 mg/g, which was about 3.5 times that of MNIPs. The adsorption equilibrium time was 180 min. The dynamic adsorption experiments showed that the adsorption process of MMIPs to CFX conformed to the pseudo-second-order model. Through static adsorption study, the Scatchard analysis showed that MMIPs had two types of binding sites-the high-affinity binding sites and the low-affinity binding sites-while the Langmuir model fit the adsorption isotherms well (R2 = 0.9962). Cefepime and ceftiofur were selected as the structural analogs of CFX for selective adsorption studies; the adsorption of CFX by MMIPs was higher than that of other structural analogs; and the imprinting factors of CFX, cefepime, and ceftiofur were 3.5, 1.7, and 1.4, respectively. Furthermore, the MMIPs also showed excellent reusable performance.
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Affiliation(s)
- Li Zhang
- College of Chemistry and Chemical Engineering, Xinjiang Normal University, Urumqi 830054, China;
| | - Hongbo Mo
- Chongqing Academy of Metrology and Quality Inspection, Chongqing 401123, China
| | - Chuan Wang
- Chongqing Academy of Metrology and Quality Inspection, Chongqing 401123, China
| | - Xiaofeng Li
- Chongqing Academy of Metrology and Quality Inspection, Chongqing 401123, China
| | - Shuai Jiang
- Chongqing Academy of Metrology and Quality Inspection, Chongqing 401123, China
| | - Weigang Fan
- College of Chemistry and Chemical Engineering, Xinjiang Normal University, Urumqi 830054, China;
| | - Yagang Zhang
- School of Materials and Energy, University of Electronic Science and Technology, Chengdu 611731, China;
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Wang S, Yang J, Sun J, Liu K, Xie X, Hong L, Wang S, Pan M. Nanomaterial-based magnetic surface molecularly imprinted polymers for specific extraction and efficient recognition of dibutyl phthalate. Food Chem 2023; 426:136621. [PMID: 37354582 DOI: 10.1016/j.foodchem.2023.136621] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/04/2022] [Revised: 05/27/2023] [Accepted: 06/10/2023] [Indexed: 06/26/2023]
Abstract
A rapid and selective sorbent for the enrichment of dibutyl phthalate (DBP) from water and Chinese Baijiu samples was established using magnetic surface molecularly imprinted polymers (MSMIPs) combined with gas chromatography-mass spectrometer (GC-MS). The MSMIPs were synthesized using a magnetic nanosphere material with silica layer, increasing the polymer surface area as a carrier. Compared with the traditional methods, the addition of magnetic microspheres simplified the process of food substrate purification and significantly shortened the pre-concentration time. The MSMIPs adsorption conforms to the Freundlich isotherm model as multilayer adsorption on an inhomogeneous surface and the pseudo-second-order model. The developed MSMIPs combined with GC-MS method showed good linearity in DBP concentration range of 0.02-1.0 mg L-1 with low LOD (0.0054 mg L-1) and LOQ (0.018 mg L-1), and obtained good recoveries in real samples (95.2-97.2%) with RSD < 5.0% (n = 9), which were consistent with those from Chinese national standard method.
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Affiliation(s)
- Shan Wang
- State Key Laboratory of Food Nutrition and Safety, Tianjin University of Science and Technology, Tianjin 300457, China; Tianjin Key Laboratory of Food Quality and Health, Tianjin University of Science and Technology, Tianjin 300457, China
| | - Jingying Yang
- State Key Laboratory of Food Nutrition and Safety, Tianjin University of Science and Technology, Tianjin 300457, China; Tianjin Key Laboratory of Food Quality and Health, Tianjin University of Science and Technology, Tianjin 300457, China
| | - Jiaqing Sun
- State Key Laboratory of Food Nutrition and Safety, Tianjin University of Science and Technology, Tianjin 300457, China; Tianjin Key Laboratory of Food Quality and Health, Tianjin University of Science and Technology, Tianjin 300457, China
| | - Kaixin Liu
- State Key Laboratory of Food Nutrition and Safety, Tianjin University of Science and Technology, Tianjin 300457, China; Tianjin Key Laboratory of Food Quality and Health, Tianjin University of Science and Technology, Tianjin 300457, China
| | - Xiaoqian Xie
- State Key Laboratory of Food Nutrition and Safety, Tianjin University of Science and Technology, Tianjin 300457, China; Tianjin Key Laboratory of Food Quality and Health, Tianjin University of Science and Technology, Tianjin 300457, China
| | - Liping Hong
- State Key Laboratory of Food Nutrition and Safety, Tianjin University of Science and Technology, Tianjin 300457, China; Tianjin Key Laboratory of Food Quality and Health, Tianjin University of Science and Technology, Tianjin 300457, China
| | - Shuo Wang
- State Key Laboratory of Food Nutrition and Safety, Tianjin University of Science and Technology, Tianjin 300457, China; Tianjin Key Laboratory of Food Quality and Health, Tianjin University of Science and Technology, Tianjin 300457, China.
| | - Mingfei Pan
- State Key Laboratory of Food Nutrition and Safety, Tianjin University of Science and Technology, Tianjin 300457, China; Tianjin Key Laboratory of Food Quality and Health, Tianjin University of Science and Technology, Tianjin 300457, China.
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Zhou Y, Sha T, Liu D, Liao B, Li K. Molecularly imprinted ratiometric fluorescence detection of tetracycline based on its fluorescence enhancement effect caused by tungsten trioxide quantum dots. SPECTROCHIMICA ACTA. PART A, MOLECULAR AND BIOMOLECULAR SPECTROSCOPY 2023; 290:122248. [PMID: 36580750 DOI: 10.1016/j.saa.2022.122248] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/07/2022] [Revised: 12/03/2022] [Accepted: 12/12/2022] [Indexed: 06/17/2023]
Abstract
This paper reports a novel probe developed based on the tungsten trioxide quantum dots (WO3-x QDs) and molecularly imprinted polymers for the detection of trace tetracycline (TC) in the complex food matrix. Tungsten ion (W6+) in WO3-x QDs has a fluorescence enhancement effect on TC, and TC has a fluorescence quenching effect on WO3-x QDs. The blue emission of the WO3-x QDs (λem = 470 nm) as a reference and the yellow emission of the TC (λem = 550 nm) as a response were utilized for the ratiometric fluorescence detection. In order to improve its selectivity, the molecular imprinting technology was combined to construct molecularly imprinted ratiometric fluorescent probes (MIRFPs). Therefore, the MIRFPs can not only selectively detect TC, but also realize the visual detection from blue to yellow. Under the optimal conditions, the linear ranges of 0.01 ∼ 10.0 μmol/L and 20.0 ∼ 80.0 μmol/L were obtained with the limits of detection of 3.23 nmol/L and 6.37 μmol/L, respectively. Furthermore, the MIRFPs had been successfully applied to the detection of TC in milk and eggs. The satisfactory recoveries were in the range of 92.7 ∼ 102.9 % with relative standard deviations (RSD, n = 3) below 1.59 %. This work offers a good strategy for the detection of food hazards.
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Affiliation(s)
- Yingjie Zhou
- School of Pharmacy, Guangdong Pharmaceutical University, Guangzhou 510006, China
| | - Tianjian Sha
- School of Pharmacy, Guangdong Pharmaceutical University, Guangzhou 510006, China
| | - Dong Liu
- School of Pharmacy, Guangdong Pharmaceutical University, Guangzhou 510006, China
| | - Baowen Liao
- School of Pharmacy, Guangdong Pharmaceutical University, Guangzhou 510006, China
| | - Kang Li
- School of Pharmacy, Guangdong Pharmaceutical University, Guangzhou 510006, China.
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Recent Advances in Molecularly Imprinted Polymers for Antibiotic Analysis. MOLECULES (BASEL, SWITZERLAND) 2023; 28:molecules28010335. [PMID: 36615529 PMCID: PMC9822428 DOI: 10.3390/molecules28010335] [Citation(s) in RCA: 9] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/25/2022] [Revised: 12/16/2022] [Accepted: 12/18/2022] [Indexed: 01/04/2023]
Abstract
The abuse and residues of antibiotics have a great impact on the environment and organisms, and their determination has become very important. Due to their low contents, varieties and complex matrices, effective recognition, separation and enrichment are usually required prior to determination. Molecularly imprinted polymers (MIPs), a kind of highly selective polymer prepared via molecular imprinting technology (MIT), are used widely in the analytical detection of antibiotics, as adsorbents of solid-phase extraction (SPE) and as recognition elements of sensors. Herein, recent advances in MIPs for antibiotic residue analysis are reviewed. Firstly, several new preparation techniques of MIPs for detecting antibiotics are briefly introduced, including surface imprinting, nanoimprinting, living/controlled radical polymerization, and multi-template imprinting, multi-functional monomer imprinting and dummy template imprinting. Secondly, several SPE modes based on MIPs are summarized, namely packed SPE, magnetic SPE, dispersive SPE, matrix solid-phase dispersive extraction, solid-phase microextraction, stir-bar sorptive extraction and pipette-tip SPE. Thirdly, the basic principles of MIP-based sensors and three sensing modes, including electrochemical sensing, optical sensing and mass sensing, are also outlined. Fourthly, the research progress on molecularly imprinted SPEs (MISPEs) and MIP-based electrochemical/optical/mass sensors for the detection of various antibiotic residues in environmental and food samples since 2018 are comprehensively reviewed, including sulfonamides, quinolones, β-lactams and so on. Finally, the preparation and application prospects of MIPs for detecting antibiotics are outlined.
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Lanjwani MF, Altunay N, Tuzen M. Preparation of fatty acid-based ternary deep eutectic solvents: Application for determination of tetracycline residue in water, honey and milk samples by using vortex-assisted microextraction. Food Chem 2023; 400:134085. [DOI: 10.1016/j.foodchem.2022.134085] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2022] [Revised: 08/03/2022] [Accepted: 08/29/2022] [Indexed: 10/14/2022]
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Wang Y, Li Y, Luo Y, Zhou K, Qiu X, Guo H. A novel molecularly imprinted polymer material for the recognition of ochratoxin A. JOURNAL OF POLYMER RESEARCH 2022. [DOI: 10.1007/s10965-022-03005-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/18/2022]
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Calahorrano-Moreno MB, Ordoñez-Bailon JJ, Baquerizo-Crespo RJ, Dueñas-Rivadeneira AA, B. S. M. Montenegro MC, Rodríguez-Díaz JM. Contaminants in the cow's milk we consume? Pasteurization and other technologies in the elimination of contaminants. F1000Res 2022; 11:91. [PMID: 35186276 PMCID: PMC8822143 DOI: 10.12688/f1000research.108779.1] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Accepted: 01/19/2022] [Indexed: 11/30/2022] Open
Abstract
Cow's milk is currently the most consumed product worldwide. However, due to various direct and indirect contamination sources, different chemical and microbiological contaminants have been found in cow's milk. This review details the main contaminants found in cow's milk, referring to the sources of contamination and their impact on human health. A comparative approach highlights the poor efficacy and effects of the pasteurization process with other methods used in the treatment of cow's milk. Despite pasteurization and related techniques being the most widely applied to date, they have not demonstrated efficacy in eliminating contaminants. New technologies have appeared as alternative treatments to pasteurization. However, in addition to causing physicochemical changes in the raw material, their efficacy is not total in eliminating chemical contaminants, suggesting the need for new research to find a solution that contributes to improving food safety.
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Affiliation(s)
- Micaela Belen Calahorrano-Moreno
- Departamento de Procesos Químicos, Facultad de Ciencias Matemáticas, Físicas y Químicas, Universidad Técnica de Manabí, Portoviejo, Manabí, 130104, Ecuador
| | - Jonathan Jerry Ordoñez-Bailon
- Departamento de Procesos Químicos, Facultad de Ciencias Matemáticas, Físicas y Químicas, Universidad Técnica de Manabí, Portoviejo, Manabí, 130104, Ecuador
| | - Ricardo José Baquerizo-Crespo
- Departamento de Procesos Químicos, Facultad de Ciencias Matemáticas, Físicas y Químicas, Universidad Técnica de Manabí, Portoviejo, Manabí, 130104, Ecuador
| | - Alex Alberto Dueñas-Rivadeneira
- Departamento de Procesos Agroindustriales, Facultad de Ciencias Zootécnicas, Universidad Técnica de Manabí, Portoviejo, Manabí, 130104, Ecuador
| | | | - Joan Manuel Rodríguez-Díaz
- Departamento de Procesos Químicos, Facultad de Ciencias Matemáticas, Físicas y Químicas, Universidad Técnica de Manabí, Portoviejo, Manabí, 130104, Ecuador
- Laboratorio de Análisis Químicos y Biotecnológicos, Instituto de Investigación, Universidad Técnica de Manabí, Portoviejo, Manabí, 130104, Ecuador
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Akbulut Söylemez M. Synthesis and characterization of tetracycline-imprinted membranes: A detailed positron annihilation lifetime spectroscopy investigation. J Mol Recognit 2021; 34:e2895. [PMID: 33719102 DOI: 10.1002/jmr.2895] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/26/2021] [Revised: 02/23/2021] [Accepted: 03/01/2021] [Indexed: 11/10/2022]
Abstract
Molecularly imprinted thin membranes for selective removal of tetracycline from real water samples were prepared using the radiation-induced polymerization method. The chemical and physical characterization of the membranes was conducted by FTIR, XPS, AFM and SEM analyses. The effect of the template on the size and the size distribution of the pores in the membrane structure was investigated by positron annihilation lifetime spectroscopy (PALS) experiments. The presence of the template molecule causes the formation of larger cavities, which have a strong correlation to the molecular size of the template molecule. The density of the free volume holes in the imprinted network shows a significant increase due to the presence of the template molecule. The binding performances of the membranes were tested against various factors such as pH, time and initial concentration of template molecules. The specific selectivity of the membranes was investigated by cross-reactivity experiments. The binding capacity of the imprinted membranes was obtained at 14.5 μmol g-1 , with the highest imprinting factor (2.84) for tetracycline. The imprinting factor was obtained at 1.44, 1.25 and 1.57 for oxytetracycline hydrochloride, doxycycline hyclate and chlortetracycline, respectively. The binding capability of the imprinted membranes in real water samples was promising for the application of the membranes as a filter material for removal of tetracycline with high binding capacity. Tetracycline binding percentage of the membranes was determined at 92.4, 81.1., 75.0 and 68.7 for ultra-pure water, tap water and natural water samples collected from different sources, respectively.
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