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Liu X, Wang H, Wang C, Zhao L, Pan H, Liu Y, Liang L, Zhao C, Huang S. Self-endowed magnetic photocatalysts derived from iron-rich sludge and its recycling in photocatalytic process for tetracycline degradation. BIORESOURCE TECHNOLOGY 2024; 395:130357. [PMID: 38262542 DOI: 10.1016/j.biortech.2024.130357] [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: 10/31/2023] [Revised: 01/17/2024] [Accepted: 01/18/2024] [Indexed: 01/25/2024]
Abstract
The disposal of iron-rich sludge by landfill or incineration poses environmental risks and wastes resources. The utilization of iron-rich sludge for magnetic material preparation offers a sustainable and resource-efficient solution for its disposal. Herein, self-endowed magnetic photocatalysts were initially prepared by pyrolysis using iron-rich sludge without any additives. The photocatalysts performance were evaluated for tetracycline degradation, with the highest degradation rate of 95.3 % at a concentration of 10 mg·L-1 (pH = 7) within 5 h being achieved for the photocatalyst prepared at 800 °C. The reactive radical species in the photocatalysis process were confirmed to be •OH and O2•- activated by ferrous oxygen species under light irradiation. Furthermore, quinone-like structures induced bound persistent free radicals, which emerged as the predominant factors influencing 1O2 formation. The employed photocatalyst can be efficiently separated and recovered owing to its magnetism. This work presents an economic solution for antibiotic removal using waste iron-rich sludge.
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Affiliation(s)
- Xixiang Liu
- Guangxi Colleges and Universities Key Laboratory of Environmental-friendly Materials and New Technology for Carbon Neutralization, Guangxi Key Laboratory of Advanced Structural Materials and Carbon Neutralization, School of Materials and Environment, Guangxi Minzu University, Nanning 530006, China; Research Center for Soil and Groundwater Environment, Guangxi Minzu University, Nanning 530006, China; Guangxi Research Institute of Chemical Industry Co., Ltd., Nanning 530001, China
| | - Hengyi Wang
- Guangxi Colleges and Universities Key Laboratory of Environmental-friendly Materials and New Technology for Carbon Neutralization, Guangxi Key Laboratory of Advanced Structural Materials and Carbon Neutralization, School of Materials and Environment, Guangxi Minzu University, Nanning 530006, China; Research Center for Soil and Groundwater Environment, Guangxi Minzu University, Nanning 530006, China
| | - Chenxu Wang
- Guangxi Colleges and Universities Key Laboratory of Environmental-friendly Materials and New Technology for Carbon Neutralization, Guangxi Key Laboratory of Advanced Structural Materials and Carbon Neutralization, School of Materials and Environment, Guangxi Minzu University, Nanning 530006, China; Research Center for Soil and Groundwater Environment, Guangxi Minzu University, Nanning 530006, China
| | - Liyang Zhao
- Guangxi Colleges and Universities Key Laboratory of Environmental-friendly Materials and New Technology for Carbon Neutralization, Guangxi Key Laboratory of Advanced Structural Materials and Carbon Neutralization, School of Materials and Environment, Guangxi Minzu University, Nanning 530006, China; Research Center for Soil and Groundwater Environment, Guangxi Minzu University, Nanning 530006, China
| | - Honghui Pan
- Guangxi Colleges and Universities Key Laboratory of Environmental-friendly Materials and New Technology for Carbon Neutralization, Guangxi Key Laboratory of Advanced Structural Materials and Carbon Neutralization, School of Materials and Environment, Guangxi Minzu University, Nanning 530006, China; Research Center for Soil and Groundwater Environment, Guangxi Minzu University, Nanning 530006, China; Guangxi Research Institute of Chemical Industry Co., Ltd., Nanning 530001, China.
| | - Yan Liu
- Guangxi Colleges and Universities Key Laboratory of Environmental-friendly Materials and New Technology for Carbon Neutralization, Guangxi Key Laboratory of Advanced Structural Materials and Carbon Neutralization, School of Materials and Environment, Guangxi Minzu University, Nanning 530006, China; Research Center for Soil and Groundwater Environment, Guangxi Minzu University, Nanning 530006, China.
| | - Liying Liang
- Guangxi Colleges and Universities Key Laboratory of Environmental-friendly Materials and New Technology for Carbon Neutralization, Guangxi Key Laboratory of Advanced Structural Materials and Carbon Neutralization, School of Materials and Environment, Guangxi Minzu University, Nanning 530006, China; Research Center for Soil and Groundwater Environment, Guangxi Minzu University, Nanning 530006, China
| | - Chuanqi Zhao
- Guangxi Colleges and Universities Key Laboratory of Environmental-friendly Materials and New Technology for Carbon Neutralization, Guangxi Key Laboratory of Advanced Structural Materials and Carbon Neutralization, School of Materials and Environment, Guangxi Minzu University, Nanning 530006, China; Research Center for Soil and Groundwater Environment, Guangxi Minzu University, Nanning 530006, China
| | - Shiyong Huang
- Guangxi Research Institute of Chemical Industry Co., Ltd., Nanning 530001, China
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2
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Billié S, Reversé K, Arlabosse JM, Bertin D, Boulier A, Cachot T, Chambon S, Charras K, Cren C, Furnes B, Gerfaud T, Joly-Battaglini M, Longoni D, Mouis G, Pierre R, Raynard H, Texier T, Trognon C, Zanelli U, Boiteau JG, Harris CS. Identification of unknown impurities J, RRT 2.2, 2.4, 2.6 and 3.4 in tetralysal® capsules. Eur J Pharm Sci 2023; 188:106519. [PMID: 37478583 DOI: 10.1016/j.ejps.2023.106519] [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: 05/19/2023] [Revised: 06/16/2023] [Accepted: 07/05/2023] [Indexed: 07/23/2023]
Abstract
Tetralysal® is a Galderma oral drug product (DP) marketed for the treatment of acne. Tetralysal® is sold in capsules containing either 150 mg or 300 mg of the drug substance. In the British Pharmacopoeia monograph for Lymecycline Capsules, the impurities already specified in the drug substance (A-G), visible in the European Pharmacopoeia 〈1654〉, are also specified together with an unidentified impurity at RRT 1.6 (Impurity J). Based on both monographs Galderma has focused on characterizing most of specified and unspecified impurities to better understand the stability and degradation processes of the formulation. In this manuscript, through both formal synthesis, preparative LCMS and formal degradation studies, we are the first group to confirm the structural identities of 5 unidentified impurities (Impurity J (RRT 1.6), RRT 2.2, 2.4, 2.6 and 3.4), conditions which exacerbate the formation of all 5 impurities and response factors for RRT 2.2, 2.6 and 3.4.
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Affiliation(s)
| | - Kevin Reversé
- Nuvisan France SARL - CS 10287, Sophia-Antipolis 06905, France
| | | | - Didier Bertin
- Galderma SA, Av. d'Ouchy 4, Lausanne 1006, Switzerland
| | - Antoine Boulier
- Laboratoires Galderma SAS, ZI Montdésir, Alby-sur-Chéran 74540, France
| | - Tony Cachot
- Nuvisan France SARL - CS 10287, Sophia-Antipolis 06905, France
| | | | - Karine Charras
- Laboratoires Galderma SAS, ZI Montdésir, Alby-sur-Chéran 74540, France.
| | - Cécile Cren
- Galderma SA, Av. d'Ouchy 4, Lausanne 1006, Switzerland
| | - Bjarte Furnes
- Galderma SA, Av. d'Ouchy 4, Lausanne 1006, Switzerland
| | - Thibaud Gerfaud
- Nuvisan France SARL - CS 10287, Sophia-Antipolis 06905, France
| | | | - Davide Longoni
- Olon SpA, Strada Rivoltana, km 6/7, Rodano, Milan 20053, Italy
| | - Gregoire Mouis
- Nuvisan France SARL - CS 10287, Sophia-Antipolis 06905, France
| | - Romain Pierre
- Nuvisan France SARL - CS 10287, Sophia-Antipolis 06905, France
| | | | - Thomas Texier
- Nuvisan France SARL - CS 10287, Sophia-Antipolis 06905, France
| | | | - Ugo Zanelli
- Galderma SA, Av. d'Ouchy 4, Lausanne 1006, Switzerland
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Liu X, Wang H, Shi X, Zhou Z, Li N, Pan H, Shi Q. Efficient photocatalytic degradation of tetracycline using magnetic biochar derived by iron-rich sludge. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2023; 30:90708-90720. [PMID: 37464209 DOI: 10.1007/s11356-023-28769-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/18/2023] [Accepted: 07/09/2023] [Indexed: 07/20/2023]
Abstract
Industrial wastewater treatment processes produce a large quantity of iron-rich sludge due to the extensive utilization of iron salt reagent. Reuse of iron-rich sludge is an attractive route for excess sludge disposal and management. In this study, sludge-derived magnetic photocatalyst was prepared using industrial iron-rich sludge as raw materials for the first time. The photocatalytic degradation system constructed by the sludge-derived photocatalysts were evaluated using tetracycline (TC) as the target contaminant, achieving a high degradation rate of 98.3% within 5 h under optimal conditions. Major reactive oxygen species in the photocatalytic systems were investigated using radical quenching experiments and electron paramagnetic resonance spectroscopy. The results suggested that •OH and O2•- were activated by photogenerated electrons and holes, respectively. Moreover, bound persistent free radicals induced by quinone-like structure in sludge-derived biochar were the predominant factors affecting radical 1O2 formation under the light irradiation. The reactive oxygen species of •OH, O2•-, and 1O2 played main roles in the degradation of TC. The used magnetic biochar can be effectively separated and recovered in aqueous solutions by the magnetism. This method provides a new cost-effective strategy for antibiotics removal from aqueous solution.
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Affiliation(s)
- Xixiang Liu
- Guangxi Colleges and Universities Key Laboratory of Environmental-friendly Materials and New Technology for Carbon Neutralization, Guangxi Key Laboratory of Advanced Structural Materials and Carbon Neutralization, School of Materials and Environment, Guangxi Minzu University, Nanning, 530006, China
- Research Center for Soil and Groundwater Environment, Guangxi Minzu University, Nanning, 530006, China
- Guangxi Research Institute of Chemical Industry Co., Ltd., Nanning, 530001, China
| | - Hengyi Wang
- Guangxi Colleges and Universities Key Laboratory of Environmental-friendly Materials and New Technology for Carbon Neutralization, Guangxi Key Laboratory of Advanced Structural Materials and Carbon Neutralization, School of Materials and Environment, Guangxi Minzu University, Nanning, 530006, China
- Research Center for Soil and Groundwater Environment, Guangxi Minzu University, Nanning, 530006, China
| | - Xinyi Shi
- Guangxi Colleges and Universities Key Laboratory of Environmental-friendly Materials and New Technology for Carbon Neutralization, Guangxi Key Laboratory of Advanced Structural Materials and Carbon Neutralization, School of Materials and Environment, Guangxi Minzu University, Nanning, 530006, China
- Research Center for Soil and Groundwater Environment, Guangxi Minzu University, Nanning, 530006, China
| | - Zheng Zhou
- Huahong Water Group Co. Ltd., Nanning, 530000, China
| | - Nan Li
- Huahong Water Group Co. Ltd., Nanning, 530000, China
| | - Honghui Pan
- Guangxi Colleges and Universities Key Laboratory of Environmental-friendly Materials and New Technology for Carbon Neutralization, Guangxi Key Laboratory of Advanced Structural Materials and Carbon Neutralization, School of Materials and Environment, Guangxi Minzu University, Nanning, 530006, China
- Research Center for Soil and Groundwater Environment, Guangxi Minzu University, Nanning, 530006, China
| | - Qin Shi
- Guangxi Colleges and Universities Key Laboratory of Environmental-friendly Materials and New Technology for Carbon Neutralization, Guangxi Key Laboratory of Advanced Structural Materials and Carbon Neutralization, School of Materials and Environment, Guangxi Minzu University, Nanning, 530006, China.
- Research Center for Soil and Groundwater Environment, Guangxi Minzu University, Nanning, 530006, China.
- Guangxi Research Institute of Chemical Industry Co., Ltd., Nanning, 530001, China.
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Carvalho Feitosa R, Souza Ribeiro Costa J, van Vliet Lima M, Sawa Akioka Ishikawa E, Cogo Müller K, Bonin Okasaki F, Sabadini E, Garnero C, Longhi MR, Lavayen V, da Silva-Júnior AA, Oliveira-Nascimento L. Supramolecular Arrangement of Doxycycline with Sulfobutylether-β-Cyclodextrin: Impact on Nanostructuration with Chitosan, Drug Degradation and Antimicrobial Potency. Pharmaceutics 2023; 15:pharmaceutics15041285. [PMID: 37111770 PMCID: PMC10144562 DOI: 10.3390/pharmaceutics15041285] [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: 02/15/2023] [Revised: 03/31/2023] [Accepted: 04/12/2023] [Indexed: 04/29/2023] Open
Abstract
Doxycycline (DX) is a well-established and broad-spectrum antimicrobial drug. However, DX has drawbacks, such as physicochemical instability in aqueous media and bacterial resistance. The inclusion of drugs in cyclodextrin complexes and their loading into nanocarriers can overcome these limitations. Thus, we studied the DX/sulfobutylether-β-CD (SBE-β-CD) inclusion complex for the first time and used it to reticulate chitosan. The resulting particles were evaluated by their physicochemical characteristics and antibacterial activity. DX/SBE-β-CD complexes were characterized by nuclear magnetic resonance, infrared spectroscopy, thermal analysis, X-ray diffraction, and scanning electron microscopy (SEM), whereas DX-loaded nanoparticles were characterized by dynamic light scattering, SEM, and drug content. The partial inclusion of the DX molecule in CD happened in a 1:1 proportion and brought increased stability to solid DX upon thermal degradation. Chitosan-complex nanoparticles measured approximately 200 nm, with a narrow polydispersity and particles with sufficient drug encapsulation for microbiological studies. Both formulations preserved the antimicrobial activity of DX against Staphylococcus aureus, whereas DX/SBE-β-CD inclusion complexes were also active against Klebsiella pneumoniae, indicating the potential use of these formulations as drug delivery systems to treat local infections.
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Affiliation(s)
- Renata Carvalho Feitosa
- Faculty of Pharmaceutical Sciences, University of Campinas (UNICAMP), Campinas 13083-871, SP, Brazil
| | | | - Marcelo van Vliet Lima
- Faculty of Pharmaceutical Sciences, University of Campinas (UNICAMP), Campinas 13083-871, SP, Brazil
| | | | - Karina Cogo Müller
- Faculty of Pharmaceutical Sciences, University of Campinas (UNICAMP), Campinas 13083-871, SP, Brazil
| | - Fernando Bonin Okasaki
- Department of Physical Chemistry, Institute of Chemistry, University of Campinas (UNICAMP), Campinas 13083-970, SP, Brazil
| | - Edvaldo Sabadini
- Department of Physical Chemistry, Institute of Chemistry, University of Campinas (UNICAMP), Campinas 13083-970, SP, Brazil
| | - Claudia Garnero
- Research and Pharmaceutical Technology Development Unit (UNITEFA, CONICET-UNC) and Department of Pharmacy, Faculty of Chemical Sciences, National University of Cordoba, Cordoba X5000HUA, Argentina
| | - Marcela Raquel Longhi
- Research and Pharmaceutical Technology Development Unit (UNITEFA, CONICET-UNC) and Department of Pharmacy, Faculty of Chemical Sciences, National University of Cordoba, Cordoba X5000HUA, Argentina
| | - Vladimir Lavayen
- Department of Inorganic Chemistry, Institute of Chemistry, Federal University of Rio Grande do Sul (UFRGS), Porto Alegre 91501-970, RS, Brazil
| | - Arnóbio Antônio da Silva-Júnior
- Laboratory of Pharmaceutical Technology and Biotechnology, Department of Pharmacy, Federal University of Rio Grande do Norte (UFRN), Natal 59012-570, RN, Brazil
| | - Laura Oliveira-Nascimento
- Faculty of Pharmaceutical Sciences, University of Campinas (UNICAMP), Campinas 13083-871, SP, Brazil
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Korać Jačić J, Milenković MR, Bajuk-Bogdanović D, Stanković D, Dimitrijević M, Spasojević I. The impact of ferric iron and pH on photo-degradation of tetracycline in water. J Photochem Photobiol A Chem 2022. [DOI: 10.1016/j.jphotochem.2022.114155] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/17/2022]
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6
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Peng A, Wang C, Zhang Z, Jin X, Gu C, Chen Z. Tetracycline photolysis revisited: Overlooked day-night succession of the parent compound and metabolites in natural surface waters and associated ecotoxicity. WATER RESEARCH 2022; 225:119197. [PMID: 36215839 DOI: 10.1016/j.watres.2022.119197] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/26/2022] [Revised: 09/29/2022] [Accepted: 09/30/2022] [Indexed: 06/16/2023]
Abstract
Despite the extensive study of tetracycline photolysis in aquatic environments, the phototransformation of tetracycline and its metabolites under natural day-night succession has not been examined. In this study, we investigated tetracycline photolysis and associated ecotoxicity in two natural surface waters and one artificial ultrapure water under simulated day/night cycling over two days. Previously unrecognized and highly pH- and temperature-dependent dark interconversions of tetracycline metabolites were observed. The liquid chromatography-mass spectrometry/mass spectrometry analysis identified a range of isomerized, hydroxylated, demethylated, deaminated, and open-ring photoproducts. The hydrolysis of tetracycline, isotetracycline, and several intermediate products was proposed as the major mechanism for the observed dark transformations. Exposure studies employing Escherichia coli indicated that although the tetracycline degradation products had lower bacterial toxicities than the parent compound, increasing toxicity with irradiation time after the near-complete degradation of the parent compound in natural waters implied that product mixtures retain ecotoxicity. The dark transformations also affected the bacterial toxicity and fluorescence properties of irradiated tetracycline solutions. Overall, this study provides new insights into the photochemical behavior of tetracycline and its associated ecological risk in aquatic environments.
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Affiliation(s)
- Anping Peng
- School of Environmental and Municipal Engineering, Tianjin Chengjian University, Tianjin, 300384, China; Ministry of Education Key Laboratory of Pollution Processes and Environmental Criteria, Nankai University, Tianjin 300350, China
| | - Chao Wang
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210093, China
| | - Zhanhua Zhang
- Ministry of Education Key Laboratory of Pollution Processes and Environmental Criteria, Nankai University, Tianjin 300350, China; College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China
| | - Xin Jin
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210093, China
| | - Cheng Gu
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, 210093, China
| | - Zeyou Chen
- Ministry of Education Key Laboratory of Pollution Processes and Environmental Criteria, Nankai University, Tianjin 300350, China; College of Environmental Science and Engineering, Nankai University, Tianjin 300350, China.
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7
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Sancho E, Granados-Chinchilla F, Barquero-Calvo E. Determination of streptomycin and doxycycline using LC/MS towards an effective treatment against an experimental Brucella abortus infection in mice. J Microbiol Methods 2022; 194:106436. [DOI: 10.1016/j.mimet.2022.106436] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/10/2022] [Revised: 02/22/2022] [Accepted: 02/22/2022] [Indexed: 12/27/2022]
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Sereshti H, Abdolhosseini G, Soltani S, Jamshidi F, Nouri N. Natural thymol-based ternary deep eutectic solvents: Application in air-bubble assisted-dispersive liquid-liquid microextraction for the analysis of tetracyclines in water. J Sep Sci 2021; 44:3626-3635. [PMID: 34355865 DOI: 10.1002/jssc.202100495] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/23/2021] [Revised: 07/31/2021] [Accepted: 08/03/2021] [Indexed: 11/06/2022]
Abstract
Four new thymol-based ternary deep eutectic solvents were prepared and evaluated as the extractive phase in air-bubbles assisted dispersive liquid-liquid microextraction for extraction of tetracycline, doxycycline, and oxytetracycline from the water before high-performance liquid chromatography. The maximum extraction efficiencies were obtained using 400 μL of [choline chloride]:[thymol]:[nonanoic acid] in the molar ratio of 1:2:2 at pH = 5. The solvent was characterized by FTIR and NMR spectroscopy. The hydrophobicity of the deep eutectic solvent and its effect on the pH of water samples after mixing was also studied. Besides, the extraction efficiency of the ternary deep eutectic solvent was compared with that of two binary thymol-based deep eutectic solvents, including [choline chloride]:[thymol] and [thymol]:[nonanoic acid] at the same conditions. Under optimal conditions, limits of detection and quantification were 1.2-8.0 and 3.8-26.6 μg/L, respectively. The linear ranges were 18.2-500 μg/L for oxytetracycline, 26.6-500 μg/L for tetracycline, and 3.8-500 μg/L for doxycycline with the determination coefficients > 0.9912. Intra- and inter-day relative standard deviations were 1.2-3.8 and 7.7-11.2%, respectively. The developed method was applied to the analysis of tetracyclines in unspiked and spiked environmental water samples, and the obtained recoveries were 74.5-95.4% with relative standard deviations of 1.2-4.0%.
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Affiliation(s)
- Hassan Sereshti
- School of Chemistry, College of Science, University of Tehran, Tehran, Iran
| | | | - Sara Soltani
- School of Chemistry, College of Science, University of Tehran, Tehran, Iran
| | - Fatemeh Jamshidi
- School of Chemistry, College of Science, University of Tehran, Tehran, Iran
| | - Nina Nouri
- School of Chemistry, College of Science, University of Tehran, Tehran, Iran
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Deol KK, Muller G. Luminescent and Chiroptical Properties of 1 : 1 Eu (III) : Tetracycline Species Probed by Circularly Polarized Luminescence. Chempluschem 2020; 84:1796-1804. [PMID: 31943861 DOI: 10.1002/cplu.201900627] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/18/2019] [Revised: 11/05/2019] [Indexed: 11/08/2022]
Abstract
This study investigates the significantly different luminescent and chiroptical properties of tetracycline (TC) when coordinated to Eu(III). The approach involves understanding the 1) speciation of TC and 2) conformation and species formed between Eu(III) and TC in a ratio of 1 : 1 in a dimethylformamide (DMF) solution and as a function of the pH value. By identifying the conformational changes of the various 1 : 1 Eu(III) : TC species, the results from this study explain information on the local microenvironment about the Eu(III) metal center. In particular, 5 D0 ←7 F0 Eu(III) laser excitation spectroscopy was employed to distinguish the different types of species found in solution in order to understand the interaction between Eu(III) and TC. On the other hand, circularly polarized luminescence (CPL) spectroscopy was used to understand the structural changes within the 1 : 1 Eu(III) : TC complex that could be related to the chirality of the Eu(III)-containing species. The CPL spectrum serves as a "fingerprint" to indicate the conformational changes within the 1 : 1 Eu(III) : TC complex as a result of the chiroptical signal arising from the various Eu(III) : TC species.
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Affiliation(s)
- Kirandeep K Deol
- Department of Chemistry, San José State University, One Washington Square, San José, CA 95192-0101, USA
| | - Gilles Muller
- Department of Chemistry, San José State University, One Washington Square, San José, CA 95192-0101, USA
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Rydzyński D, Piotrowicz-Cieślak AI, Grajek H, Wasilewski J. Investigation of chlorophyll degradation by tetracycline. CHEMOSPHERE 2019; 229:409-417. [PMID: 31082708 DOI: 10.1016/j.chemosphere.2019.05.035] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/22/2019] [Revised: 04/30/2019] [Accepted: 05/04/2019] [Indexed: 06/09/2023]
Abstract
Antibiotics represent a novel type of environment pollutants which modify chlorophyll content in plants. Spectroscopic methods were employed to investigate the effect of tetracycline on chlorophyll degradation. Changes in absorbance and fluorescence demonstrated that tetracycline reaction with chlorophyll results in the formation of pheophytin, which was confirmed by new bands typical of pheophytin which appeared in the absorbance spectrum. The rate of pheophytin formation depended on ratio tetracycline to chlorophyll concentration in solution. In solutions with chlorophyll concentration of C = 1 × 10-5 M and tetracycline concentrations of C = 1 × 10-3 M and C = 1 × 10-2 M, pheophytin was formed after 28 h and 25 min, respectively. The obtained lifetime for pheophytin formed during chlorophyll reaction - with tetracycline hydrochloride was τ = 5.71 ± 0.02 ns and its value coincides, within the error limits, with the value obtained for pure pheophytin purchased from ChromaDex. The experiment demonstrated two mechanisms of chlorophyll degradation to pheophytin by tetracycline hydrochloride, i.e. 1) loss of Mg2+ ions from the chlorophyll molecule as a result of the presence of H+ ions in solution (i.e. as a result of medium acidification), and 2) removal of Mg2+ ions directly from chlorophyll by tetracycline which binds Mg2+ ions from the chlorophyll. We demonstrated that magnesium occurring in low concentrations attached to a tetracycline molecule in the BCD ring, and that the second ion of Mg2+ may attach to the A ring of tetracycline at higher Mg2+ concentrations. Two fluorescence bands appeared which indicated such magnesium attachments indeed occurred.
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Affiliation(s)
- Dariusz Rydzyński
- Department of Plant Physiology, Genetics and Biotechnology, Faculty of Biology and Biotechnology, University of Warmia and Mazury in Olsztyn, Oczapowskiego 1A, 10-718, Olsztyn, Poland; Department of Physics and Biophysics, Faculty of Food Science, University of Warmia and Mazury in Olsztyn, Oczapowskiego 4, 10-719, Olsztyn, Poland
| | - Agnieszka I Piotrowicz-Cieślak
- Department of Plant Physiology, Genetics and Biotechnology, Faculty of Biology and Biotechnology, University of Warmia and Mazury in Olsztyn, Oczapowskiego 1A, 10-718, Olsztyn, Poland.
| | - Hanna Grajek
- Department of Physics and Biophysics, Faculty of Food Science, University of Warmia and Mazury in Olsztyn, Oczapowskiego 4, 10-719, Olsztyn, Poland
| | - Janusz Wasilewski
- Department of Biochemistry, Faculty of Biology and Biotechnology, University of Warmia and Mazury in Olsztyn, Oczapowskiego 1A, 10-718, Olsztyn, Poland
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Cherkashina K, Vakh C, Lebedinets S, Pochivalov A, Moskvin L, Lezov A, Bulatov A. An automated salting-out assisted liquid-liquid microextraction approach using 1-octylamine: On-line separation of tetracycline in urine samples followed by HPLC-UV determination. Talanta 2018; 184:122-127. [PMID: 29674022 DOI: 10.1016/j.talanta.2018.02.112] [Citation(s) in RCA: 40] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/26/2017] [Revised: 02/26/2018] [Accepted: 02/27/2018] [Indexed: 02/08/2023]
Abstract
An automated salting-out assisted liquid-liquid microextraction (SALLME) procedure based on a flow system was developed as new approach for pretreatment of complex sample matrix. In this procedure 1-octylamine was investigated as novel extractant for the SALLME. The procedure involved aspiration of the 1-octylamine and sample solution into a mixing chamber of a flow system followed by their air-bubble mixing resulting to isotropic solution formation. To provide phase separation a salting-out agent solution was added into the mixing chamber. After phase separation, the micellar 1-octylamine phase containing analyte was mixed with methanol and transported to a HPLC-UV system. To demonstrate the efficiency of the suggested approach, the automated procedure was applied for the HPLC-UV determination of tetracycline as a proof-of-concept analyte in human urine samples. Under the optimal conditions, the detector response of the analytes was linear in the concentration ranges of 0.5-20 mg L-1. The limit of detection, calculated from a blank test based on 3σ, was 0.17 mg L-1. The results demonstrate that the developed approach is highly cost-effective, simple and rapid.
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Affiliation(s)
- Ksenia Cherkashina
- Department of Analytical Chemistry, Institute of Chemistry, Saint-Petersburg University St. Petersburg State University, SPbSU, SPbU, 7/9 Universitetskaya nab., St. Petersburg 199034, Russia.
| | - Christina Vakh
- Department of Analytical Chemistry, Institute of Chemistry, Saint-Petersburg University St. Petersburg State University, SPbSU, SPbU, 7/9 Universitetskaya nab., St. Petersburg 199034, Russia
| | - Sofya Lebedinets
- Department of Analytical Chemistry, Institute of Chemistry, Saint-Petersburg University St. Petersburg State University, SPbSU, SPbU, 7/9 Universitetskaya nab., St. Petersburg 199034, Russia
| | - Aleksei Pochivalov
- Department of Analytical Chemistry, Institute of Chemistry, Saint-Petersburg University St. Petersburg State University, SPbSU, SPbU, 7/9 Universitetskaya nab., St. Petersburg 199034, Russia
| | - Leonid Moskvin
- Department of Analytical Chemistry, Institute of Chemistry, Saint-Petersburg University St. Petersburg State University, SPbSU, SPbU, 7/9 Universitetskaya nab., St. Petersburg 199034, Russia
| | - Aleksey Lezov
- Department of Molecular Biophysics and Polymer Physics, Saint-Petersburg University St. Petersburg State University, SPbSU, SPbU, 7/9 Universitetskaya nab., St. Petersburg 199034, Russia
| | - Andrey Bulatov
- Department of Analytical Chemistry, Institute of Chemistry, Saint-Petersburg University St. Petersburg State University, SPbSU, SPbU, 7/9 Universitetskaya nab., St. Petersburg 199034, Russia
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