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Chafi S, Ballesteros E. A sensitive, robust method for determining natural and synthetic hormones in surface and wastewaters by continuous solid-phase extraction-gas chromatography-mass spectrometry. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:53619-53632. [PMID: 35290579 PMCID: PMC9343308 DOI: 10.1007/s11356-022-19577-1] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/27/2021] [Accepted: 03/02/2022] [Indexed: 05/29/2023]
Abstract
Over recent decades, steroidal estrogens have become an emerging and very serious issue as they pose a serious threat to living organisms, soil, plants, and water resources in general. Estrogens have therefore been the subject of considerable scientific attention in order to develop new methodologies for its determination, being able of detecting them at very low concentrations. Those procedures minimize or eliminate the consumption of organic solvents and reagents that may be incompatible with the environment. In this respect, we developed a sensitive, selective method for the simultaneous determination of thirteen natural and synthetic hormones present at the nanogram-per-liter level in various types of water by using continuous solid-phase extraction in combination with gas chromatography and mass spectrometry (GC-MS). The target analytes were preferentially sorbed on an Oasis HLB sorbent column (80 mg) and eluted with acetone (600 µL) for derivatization with a mixture of 70 µL of N,O-bis(trimethylsilyl) trifluoroacetamide and trimethylchlorosilane and 35 µL of petroleum ether in a household microwave oven at 200 W for 4 min. Under optimum conditions, the ensuing method exhibited good linearity (r ≥ 0.998), good precision (RSD ≤ 7%), high recoveries (92-103%), and low detection limits (0.01-0.3 ng L-1). The method outperforms existing alternatives in robustness, sensitivity, throughput, flexibility-it allows both estrogens, progestogens, and androgens to be determined simultaneously-and compliance with the principles of Green Chemistry. It was successfully used to analyze various types of water samples (mineral, tap, well, pond, swimming pool, river, and waste) that were found to contain four estrogens (estrone, 17β-estradiol, 17α-ethinylestradiol, and hexestrol), two progestogens (testosterone, dihydrotestosterone), and one progestogen (progesterone) at concentrations ranging from 3.0 to 110 ng L-1.
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Affiliation(s)
- Safae Chafi
- Department of Physical and Analytical Chemistry, E.P.S of Linares, University of Jaén, Avenida de La Universidad, 23700, Linares, Jaén, Spain
| | - Evaristo Ballesteros
- Department of Physical and Analytical Chemistry, E.P.S of Linares, University of Jaén, Avenida de La Universidad, 23700, Linares, Jaén, Spain.
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Luo Y, Liu Z, Zeng Y, Zhang Y, Luan Y, Ma L, Chen L, Zou L, Yang J, Huang Z, Rao Y, Zhang C. A reliable tool for detecting 7-dehydrocholesterol and cholesterol in human plasma and its use in diagnosis of Smith-Lemli-Opitz syndrome. J Sep Sci 2021; 45:1080-1093. [PMID: 34962712 DOI: 10.1002/jssc.202100594] [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: 07/29/2021] [Revised: 12/19/2021] [Accepted: 12/24/2021] [Indexed: 11/08/2022]
Abstract
BACKGROUND Smith-Lemli-Opitz syndrome is a birth defect caused by the deficiency of 7-dehydrocholesterol reductase in cholesterol biosynthesis pathway, which leads to accumulation of 7-dehydrocholesterol and reduction of cholesterol in body fluids. To effectively diagnose Smith-Lemli-Opitz syndrome and monitor therapy, a reliable method for simultaneous detection of 7-dehydrocholesterol and cholesterol is needed. METHODS In the presence of antioxidants (2,6-ditert-butyl-4-methylphenol and triphenylphosphine), 50 μL of human plasma were hydrolyzed at 70℃ for 40 min with 1 M potassium hydroxide in 90% ethanol, and then 7-dehydrocholesterol and cholesterol were extracted by 600 μL of n-hexane for three times. After microwave-assisted derivatization with 70 μL of N,O-Bis(trimethylsilyl)trifluoroacetamide at 460 W for 3 min, the analytes were measured by gas chromatography-mass spectrometry (GC-MS). RESULTS The limits of detection were 100 ng/mL for 7-dehydrocholesterol and 300 ng/mL for cholesterol. Good linearity was obtained in the range of 1-600 μg/mL for 7-dehydrocholesterol and 10-600 μg/mL for cholesterol, which completely covered the biochemical levels of Smith-Lemli-Opitz syndrome patients that have been reported. CONCLUSION A time-saving and accurate GC-MS based method was developed for the determination of 7-dehydrocholesterol and cholesterol in human plasma, which also serves as a useful tool for Smith-Lemli-Opitz syndrome diagnosis, treatment and research. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Yitao Luo
- Department of Forensic Medicine, School of Basic Medical Sciences, Fudan University, Shanghai, 200032, PR China
| | - Zhengyuan Liu
- Department of Biochemistry and Pharmacology, University of Melbourne, Melbourne, VIC, 3010, Australia
| | - Yujie Zeng
- Department of Forensic Medicine, School of Basic Medical Sciences, Fudan University, Shanghai, 200032, PR China
| | - Yuxiao Zhang
- Institutes of Biomedical Sciences, Fudan University, Shanghai, 200032, PR China
| | - Yujing Luan
- Institute of Forensic Science, Ministry of Public Security, Beijing, 100038, PR China
| | - Li Ma
- Department of Neonatology Shanghai Children's Hospital Shanghai Jiao Tong University, Shanghai, 200040, PR China
| | - Li Chen
- Department of Medical Microbiology, Key Laboratory of Medical Molecular Virology of Ministries of Education and Health, School of Basic Medical Sciences, Fudan University, Shanghai, 200032, PR China
| | - Lin Zou
- Department of Medical Microbiology, Key Laboratory of Medical Molecular Virology of Ministries of Education and Health, School of Basic Medical Sciences, Fudan University, Shanghai, 200032, PR China
| | - Jingmin Yang
- Shanghai WeHealth BioMedical Technology Co., Ltd., Shanghai, 201315, PR China
| | - Zhibin Huang
- Department of Forensic Medicine, School of Basic Medical Sciences, Fudan University, Shanghai, 200032, PR China
| | - Yulan Rao
- Department of Forensic Medicine, School of Basic Medical Sciences, Fudan University, Shanghai, 200032, PR China
| | - Chengqiang Zhang
- Department of Neonatology, Obstetrics and Gynecology Hospital Affiliated to Fudan University, No. 419 Fang Xie Road, Shanghai, 200011, PR China
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Lee W, Lee H, Kim YL, Lee YC, Chung BC, Hong J. Profiling of Steroid Metabolic Pathways in Human Plasma by GC-MS/MS Combined with Microwave-Assisted Derivatization for Diagnosis of Gastric Disorders. Int J Mol Sci 2021; 22:ijms22041872. [PMID: 33668551 PMCID: PMC7918215 DOI: 10.3390/ijms22041872] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2021] [Revised: 02/10/2021] [Accepted: 02/11/2021] [Indexed: 12/17/2022] Open
Abstract
Steroid hormones are associated in depth to cellular signaling, inflammatory immune responses, and reproductive functions, and their metabolism alterations incur various diseases. In particular, quantitative profiling of steroids in plasma of patients with gastric cancer can provide a vast information to understand development of gastric cancer, since both sex hormones and glucocorticoids might be correlated with the pathological mechanisms of gastric cancer. Here, we developed a gas chromatography-tandem mass spectrometry-dynamic multiple reaction monitoring (GC-MS/MS-dMRM) method combined with solid-phase extraction (SPE) and microwave-assisted derivatization (MAD) to determine 20 endogenous steroids in human plasma. In this study, MAD conditions were optimized with respect to irradiation power and time. The SPE enabled effective cleanup and extraction for profiling of steroid hormones in human plasma samples. The MAD could improve laborious and time-consuming derivatization procedure, since dielectric heating using microwave directly increase molecular energy of reactants by penetrating through medium. Furthermore, dMRM method provided more sensitive determination of 20 steroids, compared to traditional MRM detection. The limits of quantification of steroids were below 1.125 ng/mL and determination coefficients of calibration curves were higher than 0.9925. Overall precision and accuracy results were below 19.93% and within ±17.04%, respectively. The developed method provided sufficient detection sensitivities and reliable quantification results. The established method was successfully applied to profile steroid metabolism pathways in plasma of patients with chronic superficial gastritis (CSG), intestinal metaplasia (IM), and gastric cancer. Statistical significances of steroid plasma levels between gastric disorder groups were investigated. In conclusion, this method provided comprehensive profiling of 20 steroids in human plasma samples and will be helpful to discover potential biomarkers for the development of gastric cancer and to further understand metabolic syndrome.
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Affiliation(s)
- Wonwoong Lee
- Department of Pharmacy, College of Pharmacy, Woosuk University, Wanju 55338, Korea;
| | - Hyunjung Lee
- Department of Pharmacy, College of Pharmacy, Kyung Hee University, Seoul 02447, Korea; (H.L.); (Y.L.K.)
| | - You Lee Kim
- Department of Pharmacy, College of Pharmacy, Kyung Hee University, Seoul 02447, Korea; (H.L.); (Y.L.K.)
| | - Yong Chan Lee
- Department of Internal Medicine, Institute of Gastroenterology, Yonsei University College of Medicine, Seoul 03722, Korea;
| | - Bong Chul Chung
- Molecular Recognition Research Center, Korea Institute of Science and Technology, Seoul 02792, Korea
- Correspondence: (B.C.C.); (J.H.); Tel.: +82-2-961-9255 (J.H.); Fax: +82-2-961-0357 (J.H.)
| | - Jongki Hong
- Department of Pharmacy, College of Pharmacy, Kyung Hee University, Seoul 02447, Korea; (H.L.); (Y.L.K.)
- Correspondence: (B.C.C.); (J.H.); Tel.: +82-2-961-9255 (J.H.); Fax: +82-2-961-0357 (J.H.)
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Akram M, Asghar MN, Saleem Khan M, Shahid S, Abdur Rahman HM, Nadeem I. Development and validation of an economical uric acid-Fe3+/Fe2+-ferrozine-based colorimetric assay to estimate uric acid level of pure and biological samples. Biosci Biotechnol Biochem 2020; 84:1967-1974. [DOI: 10.1080/09168451.2020.1781593] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
Abstract
Abstract
This work presents the development and validation of a simple, rapid, and cost-effective spectrophotometric method for quantitative analysis of uric acid in biological samples. The method relies upon uric acid-led reduction of Fe(III) to Fe(II) of sample/standard solutions which stoichiometrically engages ferrozine to form a magenta-colored complex. Different parameters including pH, metal and chelator concentrations, temperature, etc., were optimized for the maximum intensity and stability of the complex. The uric acid concentrations of synthetic/plasma solutions were determined by comparing the color intensity of Fe(ferrozine)32+ complex produced by test solution with the standard curve formed by known uric acid concentrations. The method was validated in accordance with ICH guidelines and subjected to human plasma analysis. The results obtained were compared with a reference (enzymatic) method which revealed that there was no significant difference between the two methods at 95% confidence level. The method is highly specific, precise, linear, accurate, and robust.
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Affiliation(s)
- Maryam Akram
- Department of Chemistry, Forman Christian College (A Chartered University), Lahore, Pakistan
| | - Muhammad Nadeem Asghar
- Department of Chemistry, Forman Christian College (A Chartered University), Lahore, Pakistan
| | - Maria Saleem Khan
- Department of Chemistry, Forman Christian College (A Chartered University), Lahore, Pakistan
| | - Sammia Shahid
- Department of Chemistry, School of Science and Technology, University of Management and Technology, Lahore, Pakistan
| | | | - Iram Nadeem
- Department of Chemistry, COMSATS University Islamabad, Lahore Campus, Pakistan
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Yao XH, Xu JY, Hao JY, Wan Y, Chen T, Zhang DY, Li L. Microwave assisted extraction for the determination of chlorogenic acid in Flos Lonicerae by direct analysis in real time mass spectrometry (DART-MS). J Chromatogr B Analyt Technol Biomed Life Sci 2018; 1092:82-87. [DOI: 10.1016/j.jchromb.2018.05.045] [Citation(s) in RCA: 19] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/22/2017] [Revised: 05/22/2018] [Accepted: 05/28/2018] [Indexed: 02/07/2023]
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Li C, Zhang J, Zhao C, Yang L, Zhao W, Jiang H, Ren X, Su W, Li Y, Guan J. Separation of the main flavonoids and essential oil from seabuckthorn leaves by ultrasonic/microwave-assisted simultaneous distillation extraction. ROYAL SOCIETY OPEN SCIENCE 2018; 5:180133. [PMID: 30109070 PMCID: PMC6083726 DOI: 10.1098/rsos.180133] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/31/2018] [Accepted: 06/13/2018] [Indexed: 05/10/2023]
Abstract
Volatile essential oils (EOs), non-volatile rutin (RU), quercetin (QU), kaempferol (KA) and isorhamnetin (IS) were effectively extracted and isolated from seabuckthorn (Hippophae rhamnoides L.) leaves by ionic liquid-based ultrasound/microwave-assisted simultaneous distillation extraction (ILUMASDE). After optimization by response surface methodology, EOs, RU, QU, KA and IS were separated under the following optimum conditions: an ionic liquid of 1.0 M 1-butyl-3-methyl imidazole bromine salt ([C4mim]), liquid/solid ratio of 12 ml g-1, extraction time of 34 min, microwave power of 540 W and a fixed ultrasonic power of 50 W. Under the optimized conditions of ILUMASDE, the extraction yields of RU, QU, KA, IS and EOs were 9.18 ± 0.35, 5.52 ± 0.23, 3.03 ± 0.11, 5.64 ± 0.24 mg g-1 and 0.095 ± 0.004%, respectively. The yield of EOs obtained using ILUMASDE was 1.07-fold higher than that obtained by conventional hydrodistillation extraction (HDE). In addition, the components of the EOs obtained using ILUMASDE and HDE were similar. The extraction yields of RU, QU, KA, IS obtained by ILUMASDE were 1.03-1.35-fold higher than that obtained by the ethanol ultrasonic-assisted extraction (EUAE), ionic liquid-based ultrasonic-assisted extraction (ILUAE) and ionic liquid-based microwave-assisted extraction (ILMAE). And the extraction time used by ILUMASDE was 34 min, which is 14.17%, 56.67%, 56.67% and 85.00% less than those used by HDE, EUAE, ILUAE and ILMAE, respectively. Therefore, ILUMASDE can be considered a rapid and efficient method for extracting flavonoids and EO from seabuckthorn (Hippophae rhamnoids L.) leaves.
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Affiliation(s)
- Chunying Li
- Key Laboratory of Forest Plant Ecology, Ministry of Education, Northeast Forestry University, Harbin 150040, People's Republic of China
- State Engineering Laboratory of Bio-Resource Eco-Utilization, Northeast Forestry University, Harbin 150040, People's Republic of China
| | - Jingjing Zhang
- Key Laboratory of Forest Plant Ecology, Ministry of Education, Northeast Forestry University, Harbin 150040, People's Republic of China
| | - Chunjian Zhao
- Key Laboratory of Forest Plant Ecology, Ministry of Education, Northeast Forestry University, Harbin 150040, People's Republic of China
- State Engineering Laboratory of Bio-Resource Eco-Utilization, Northeast Forestry University, Harbin 150040, People's Republic of China
- Author for correspondence: Chunjian Zhao e-mail:
| | - Lei Yang
- Key Laboratory of Forest Plant Ecology, Ministry of Education, Northeast Forestry University, Harbin 150040, People's Republic of China
| | - Wenyan Zhao
- Key Laboratory of Forest Plant Ecology, Ministry of Education, Northeast Forestry University, Harbin 150040, People's Republic of China
| | - Hongwei Jiang
- Key Laboratory of Forest Plant Ecology, Ministry of Education, Northeast Forestry University, Harbin 150040, People's Republic of China
| | - Xueting Ren
- Key Laboratory of Forest Plant Ecology, Ministry of Education, Northeast Forestry University, Harbin 150040, People's Republic of China
| | - Weiran Su
- Key Laboratory of Forest Plant Ecology, Ministry of Education, Northeast Forestry University, Harbin 150040, People's Republic of China
| | - Yuzheng Li
- Key Laboratory of Forest Plant Ecology, Ministry of Education, Northeast Forestry University, Harbin 150040, People's Republic of China
| | - Jiajing Guan
- Key Laboratory of Forest Plant Ecology, Ministry of Education, Northeast Forestry University, Harbin 150040, People's Republic of China
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Lin L, Zheng F, Zhou H, Li S. Biomimetic Gastrointestinal Tract Functions for Metal Absorption Assessment in Edible Plants: Comparison to In Vivo Absorption. JOURNAL OF AGRICULTURAL AND FOOD CHEMISTRY 2017; 65:6282-6287. [PMID: 28685577 DOI: 10.1021/acs.jafc.7b02054] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
A biomimetic gastrointestinal tract, including in vitro digestion and biomimetic biomembrane extraction, has been proposed for absorption assessment of metals from edible plants. However, its validity is still unknown. Herein, two species of edible plants, Anoectochilus roxburghii and Radix astragali, were selected and digested in a bionic mouth, stomach, and intestine, and then trace metals (Cr, Mn, Fe, Ni, Cu, Zn, Se, Sr, As, and Pb) were transformed to their final metal species. To check model predictability, in vitro and in vivo metal absorption were imitated and tested by monolayer liposome extraction and rat stomach or single-pass duodenal intestine, respectively. A strong correlation was established between in vivo and in vitro metal absorption ratios, with 0.89 > R2 > 0.66, and a significant relationship (p < 0.05) was exhibited for stomach, intestine, two plant species, and 10 metal species. Our biomimetic system could be used as low-cost alternatives to animal and clinical studies for multi-metal absorption.
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Affiliation(s)
- Luxiu Lin
- Fujian Province Key Laboratory of Modern Analytical Science and Separation Technology and §College of Chemistry and Environmental Science, Minnan Normal University , Zhangzhou, Fujian 363000, People's Republic of China
| | - Fengying Zheng
- Fujian Province Key Laboratory of Modern Analytical Science and Separation Technology and §College of Chemistry and Environmental Science, Minnan Normal University , Zhangzhou, Fujian 363000, People's Republic of China
| | - Haifeng Zhou
- Fujian Province Key Laboratory of Modern Analytical Science and Separation Technology and §College of Chemistry and Environmental Science, Minnan Normal University , Zhangzhou, Fujian 363000, People's Republic of China
| | - Shunxing Li
- Fujian Province Key Laboratory of Modern Analytical Science and Separation Technology and §College of Chemistry and Environmental Science, Minnan Normal University , Zhangzhou, Fujian 363000, People's Republic of China
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Rapid Analysis of the Essential Oil Components in Dried Lavender by Magnetic Microsphere-Assisted Microwave Distillation Coupled with HS-SPME Followed by GC-MS. FOOD ANAL METHOD 2017. [DOI: 10.1007/s12161-016-0790-1] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/07/2023]
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9
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Endocrine disrupting compounds (EDCs) in environmental matrices: Review of analytical strategies for pharmaceuticals, estrogenic hormones, and alkylphenol compounds. Trends Analyt Chem 2016. [DOI: 10.1016/j.trac.2016.08.004] [Citation(s) in RCA: 93] [Impact Index Per Article: 11.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/28/2022]
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10
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Poojary MM, Passamonti P. Improved conventional and microwave-assisted silylation protocols for simultaneous gas chromatographic determination of tocopherols and sterols: Method development and multi-response optimization. J Chromatogr A 2016; 1476:88-104. [PMID: 27876347 DOI: 10.1016/j.chroma.2016.10.064] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/24/2016] [Revised: 10/19/2016] [Accepted: 10/26/2016] [Indexed: 11/15/2022]
Abstract
This paper reports on improved conventional thermal silylation (CTS) and microwave-assisted silylation (MAS) methods for simultaneous determination of tocopherols and sterols by gas chromatography. Reaction parameters in each of the methods developed were systematically optimized using a full factorial design followed by a central composite design. Initially, experimental conditions for CTS were optimized using a block heater. Further, a rapid MAS was developed and optimized. To understand microwave heating mechanisms, MAS was optimized by two distinct modes of microwave heating: temperature-controlled MAS and power-controlled MAS, using dedicated instruments where reaction temperature and microwave power level were controlled and monitored online. Developed methods: were compared with routine overnight derivatization. On a comprehensive level, while both CTS and MAS were found to be efficient derivatization techniques, MAS significantly reduced the reaction time. The optimal derivatization temperature and time for CTS found to be 55°C and 54min, while it was 87°C and 1.2min for temperature-controlled MAS. Further, a microwave power of 300W and a derivatization time 0.5min found to be optimal for power-controlled MAS. The use of an appropriate derivatization solvent, such as pyridine, was found to be critical for the successful determination. Catalysts, like potassium acetate and 4-dimethylaminopyridine, enhanced the efficiency slightly. The developed methods showed excellent analytical performance in terms of linearity, accuracy and precision.
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Affiliation(s)
- Mahesha M Poojary
- University of Camerino, School of Science & Technology, Section Chemistry, Via S. Agostino 1, 62032 Camerino, Italy
| | - Paolo Passamonti
- University of Camerino, School of Science & Technology, Section Chemistry, Via S. Agostino 1, 62032 Camerino, Italy.
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11
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Collection and separation of extract in dispersive liquid-liquid microextraction with hollow fiber. Anal Bioanal Chem 2016; 408:3359-67. [DOI: 10.1007/s00216-016-9410-6] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/26/2015] [Revised: 01/24/2016] [Accepted: 02/09/2016] [Indexed: 01/26/2023]
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12
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A Microwave-Assisted Simultaneous Distillation and Extraction Method for the Separation of Polysaccharides and Essential Oil from the Leaves of Taxus chinensis Var. mairei. APPLIED SCIENCES-BASEL 2016. [DOI: 10.3390/app6020019] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
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13
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Na W, Park JW, An JH, Jang J. Size-controllable ultrathin carboxylated polypyrrole nanotube transducer for extremely sensitive 17β-estradiol FET-type biosensors. J Mater Chem B 2016; 4:5025-5034. [DOI: 10.1039/c6tb00897f] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
Size-controllable aptamer conjugated ultrathin carboxylated polypyrrole nanotubes (A-UCPPyNTs) were successfully fabricated as transducers in 17β-estradiol field-effect transistor (FET)-type biosensors which has extremely high sensitivity (∼1 fM) and unique selectivity.
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Affiliation(s)
- Wonjoo Na
- School of Chemical and Biological Engineering
- Seoul National University
- Seoul 151-742
- Korea
| | - Jin Wook Park
- School of Chemical and Biological Engineering
- Seoul National University
- Seoul 151-742
- Korea
| | - Ji Hyun An
- School of Chemical and Biological Engineering
- Seoul National University
- Seoul 151-742
- Korea
| | - Jyongsik Jang
- School of Chemical and Biological Engineering
- Seoul National University
- Seoul 151-742
- Korea
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Silvério ACP, Machado SC, Boralli VB, Martins I. Dialkyl phosphates determination by gas chromatography: Evaluation of a microwave-assisted derivatization†. J Sep Sci 2015; 38:2664-9. [DOI: 10.1002/jssc.201400997] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/12/2014] [Revised: 04/29/2015] [Accepted: 05/04/2015] [Indexed: 12/27/2022]
Affiliation(s)
- Alessandra Cristina Pupin Silvério
- Laboratory of Toxicants and Drugs Analysis- LATF, Faculty of Pharmaceutical Sciences; Federal University of Alfenas - Unifal-MG; 700 Gabriel Monteiro da Silva street Alfenas MG Brazil
| | - Simone Caetani Machado
- Laboratory of Toxicants and Drugs Analysis- LATF, Faculty of Pharmaceutical Sciences; Federal University of Alfenas - Unifal-MG; 700 Gabriel Monteiro da Silva street Alfenas MG Brazil
| | - Vanessa Bergamin Boralli
- Laboratory of Toxicants and Drugs Analysis- LATF, Faculty of Pharmaceutical Sciences; Federal University of Alfenas - Unifal-MG; 700 Gabriel Monteiro da Silva street Alfenas MG Brazil
| | - Isarita Martins
- Laboratory of Toxicants and Drugs Analysis- LATF, Faculty of Pharmaceutical Sciences; Federal University of Alfenas - Unifal-MG; 700 Gabriel Monteiro da Silva street Alfenas MG Brazil
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Du L, Ji W, Zhang Y, Zhang C, Liu G, Wang S. An ultrasensitive detection of 17β-estradiol using a gold nanoparticle-based fluorescence immunoassay. Analyst 2015; 140:2001-7. [DOI: 10.1039/c4an01952k] [Citation(s) in RCA: 36] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/05/2023]
Abstract
A fluorescence immunoassay based on functionalized gold nanoparticle amplification and immunomagnetic separation was constructed for E2detection.
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Affiliation(s)
- Lingyun Du
- Shandong Provincial Key Laboratory of Chemical Energy Storage and spectrometry (LC/MS/MS) and gas chromatography-mass Novel Cell Technology
- School of Chemistry and Chemical Engineering
- Liaocheng University
- Liaocheng 252059
- China
| | - Wei Ji
- Shandong Provincial Key Laboratory of Chemical Energy Storage and spectrometry (LC/MS/MS) and gas chromatography-mass Novel Cell Technology
- School of Chemistry and Chemical Engineering
- Liaocheng University
- Liaocheng 252059
- China
| | - Yuanfu Zhang
- Shandong Provincial Key Laboratory of Chemical Energy Storage and spectrometry (LC/MS/MS) and gas chromatography-mass Novel Cell Technology
- School of Chemistry and Chemical Engineering
- Liaocheng University
- Liaocheng 252059
- China
| | - Chunyan Zhang
- Shandong Provincial Key Laboratory of Chemical Energy Storage and spectrometry (LC/MS/MS) and gas chromatography-mass Novel Cell Technology
- School of Chemistry and Chemical Engineering
- Liaocheng University
- Liaocheng 252059
- China
| | - Guofu Liu
- College of Life Science
- Liaocheng University
- Liaocheng 252059
- China
| | - Shuhao Wang
- Shandong Provincial Key Laboratory of Chemical Energy Storage and spectrometry (LC/MS/MS) and gas chromatography-mass Novel Cell Technology
- School of Chemistry and Chemical Engineering
- Liaocheng University
- Liaocheng 252059
- China
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16
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Li C, Lu Z, Zhao C, Yang L, Fu Y, Shi K, He X, Li Z, Zu Y. Ionic-liquid-based ultrasound/microwave-assisted extraction of 2,4-dihydroxy-7-methoxy-1,4-benzoxazin-3-one and 6-methoxy-benzoxazolin-2-one from maize (Zea maysL.) seedlings. J Sep Sci 2014; 38:291-300. [DOI: 10.1002/jssc.201401081] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2014] [Revised: 10/28/2014] [Accepted: 10/29/2014] [Indexed: 12/25/2022]
Affiliation(s)
- Chunying Li
- Key Laboratory of Forest Plant Ecology, Ministry of Education; Northeast Forestry University; Harbin China
| | - Zhicheng Lu
- Key Laboratory of Forest Plant Ecology, Ministry of Education; Northeast Forestry University; Harbin China
| | - Chunjian Zhao
- Key Laboratory of Forest Plant Ecology, Ministry of Education; Northeast Forestry University; Harbin China
- College of Resources and Environmental Sciences; China Agricultural University; Beijing China
| | - Lei Yang
- Key Laboratory of Forest Plant Ecology, Ministry of Education; Northeast Forestry University; Harbin China
| | - Yujie Fu
- Key Laboratory of Forest Plant Ecology, Ministry of Education; Northeast Forestry University; Harbin China
| | - Kunming Shi
- Key Laboratory of Forest Plant Ecology, Ministry of Education; Northeast Forestry University; Harbin China
| | - Xin He
- Key Laboratory of Forest Plant Ecology, Ministry of Education; Northeast Forestry University; Harbin China
| | - Zhao Li
- Key Laboratory of Forest Plant Ecology, Ministry of Education; Northeast Forestry University; Harbin China
| | - Yuangang Zu
- Key Laboratory of Forest Plant Ecology, Ministry of Education; Northeast Forestry University; Harbin China
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17
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Mendez M, Visez N, Gosselin S, Crenn V, Riffault V, Petitprez D. Reactive and Nonreactive Ozone Uptake during Aging of Oleic Acid Particles. J Phys Chem A 2014; 118:9471-81. [DOI: 10.1021/jp503572c] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Maxence Mendez
- Physicochimie
des Processus de Combustion et de l’Atmosphère PC2A, UMR 8522 CNRS/Lille 1, Villeneuve d’Ascq, F-59655, France
| | - Nicolas Visez
- Physicochimie
des Processus de Combustion et de l’Atmosphère PC2A, UMR 8522 CNRS/Lille 1, Villeneuve d’Ascq, F-59655, France
| | - Sylvie Gosselin
- Physicochimie
des Processus de Combustion et de l’Atmosphère PC2A, UMR 8522 CNRS/Lille 1, Villeneuve d’Ascq, F-59655, France
| | - Vincent Crenn
- Sciences
de l’Atmosphère et Génie de l’Environnement, Ecole Nationale Supérieure des Mines de Douai, Douai, F-59508, France
| | - Veronique Riffault
- Sciences
de l’Atmosphère et Génie de l’Environnement, Ecole Nationale Supérieure des Mines de Douai, Douai, F-59508, France
| | - Denis Petitprez
- Physicochimie
des Processus de Combustion et de l’Atmosphère PC2A, UMR 8522 CNRS/Lille 1, Villeneuve d’Ascq, F-59655, France
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18
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Samokhin AS, Perevozchikova DV, Revelsky AI, Virus ED, Sobolevsky TG, Rodchenkov GM, Revelsky IA. An improved approach to determining the yield of derivatization reaction and its application to the investigation of the silylation of some anabolic steroids. JOURNAL OF ANALYTICAL CHEMISTRY 2013. [DOI: 10.1134/s1061934813140104] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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19
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Juang YM, She TF, Chen HY, Lai CC. Comparison of CID versus ETD-based MS/MS fragmentation for the analysis of doubly derivatized steroids. JOURNAL OF MASS SPECTROMETRY : JMS 2013; 48:1349-1356. [PMID: 24338890 DOI: 10.1002/jms.3300] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/28/2013] [Revised: 10/15/2013] [Accepted: 10/20/2013] [Indexed: 06/03/2023]
Abstract
Electrospray ionization coupled with collision-induced dissociation (CID) and tandem mass spectrometry (MS/MS) is a commonly used technique to analyze the chemical composition of steroids. However, steroids are structurally similar compounds, making it difficult to interpret their product-ion spectra. Electron transfer dissociation (ETD), a relatively new technique for protein and peptide fragmentation, has been shown to provide more detailed structural information. In this study, we compared the ability of CID with that of ETD to differentiate between eight 3,20-dioxosteroids that had been derivatizated with a quaternary ammonium salt, Girard reagent P (GirP), at room temperature or after exposure to microwave irradiation to generate doubly charged ions. We found that the derivatization of steroid with GirP hydrazine occurred in less than 10 min when the reaction was carried out in the presence of microwave irradiation compared to 30 min when the reaction was carried out at room temperature. According to the MS/MS spectra, CID provided rich, structurally informative ions; however, the spectra were complex, thereby complicating the peak assignment. In contrast, ETD generated simpler spectra, making it easier to recognize individual peaks. Remarkably, both CID and ETD were allowed to differentiate of steroid isomers, 17α-hydroxyprogesterone (17OHP) and deoxycorticosterone (DOC), but the signature ions obtained from CID were less intense than those generated by ETD, which generated much clearer spectra. These results indicate that ETD in conjunction with CID can provide more structural information for precise characterization of steroids.
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Affiliation(s)
- Yu-Min Juang
- Institute of Molecular Biology, National Chung Hsing University, Taichung, Taiwan
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20
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Chen Y, Zhang K, Zuo Y. Direct and indirect photodegradation of estriol in the presence of humic acid, nitrate and iron complexes in water solutions. THE SCIENCE OF THE TOTAL ENVIRONMENT 2013; 463-464:802-9. [PMID: 23872181 DOI: 10.1016/j.scitotenv.2013.06.026] [Citation(s) in RCA: 106] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/07/2013] [Revised: 05/31/2013] [Accepted: 06/06/2013] [Indexed: 05/15/2023]
Abstract
The photochemical behavior of a natural estrogen estriol (E3) was investigated in the presence of the natural photoreactive constituents including nitrate, iron(III), and humic acid (HA). The direct photodegradation of E3 increased with increasing incident light intensity, decreasing initial concentration of E3 and increasing pH in the range of 6.0 to 10.0. The direct photodegradation of the deprotonated speciation of E3 was much faster than that of its protonated form. The presence of NO3(-) and iron(III) promoted the photochemical loss of E3 in the aqueous solutions. The quenching experiments verified that hydroxyl radicals were predominantly responsible for the indirect photodegradation of E3. HA could act as photosensitizer, light screening agent and free radical quencher. For the first time, the enhancement or inhibition effect of HA on photodegradation was found to depend on the irradiation light intensity. HA enhanced the photodegradation of E3 under sunlight or weak irradiation of simulated sunlight. In contrast, under high irradiation light intensity, HA inhibited the photodegradation. The hydroxylation photoproducts were identified using GC-MS and the photodegradation pathway of E3 was proposed.
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Affiliation(s)
- Yong Chen
- Department of Chemistry & Biochemistry, University of Massachusetts Dartmouth, North Dartmouth, MA 02747, United States; School of Environmental Science & Engineering, Huazhong University of Science & Technology, Wuhan 430074, China
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21
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Caban M, Czerwicka M, Łukaszewicz P, Migowska N, Stepnowski P, Kwiatkowski M, Kumirska J. A new silylation reagent dimethyl(3,3,3-trifluoropropyl)silyldiethylamine for the analysis of estrogenic compounds by gas chromatography–mass spectrometry. J Chromatogr A 2013; 1301:215-24. [DOI: 10.1016/j.chroma.2013.05.073] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/26/2013] [Revised: 05/29/2013] [Accepted: 05/30/2013] [Indexed: 11/30/2022]
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22
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Zuo Y, Zhang K, Zhou S. Determination of estrogenic steroids and microbial and photochemical degradation of 17α-ethinylestradiol (EE2) in lake surface water, a case study. ENVIRONMENTAL SCIENCE. PROCESSES & IMPACTS 2013; 15:1529-1535. [PMID: 23788286 DOI: 10.1039/c3em00239j] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/02/2023]
Abstract
In this study, a GC-MS technique was applied to determine 17α-ethinylestradiol (EE2), an active ingredient of oral contraceptives, and its fate in Lake Quinsigamond, Massachusetts, USA. To the knowledge of the authors, this is the first study of EE2 and its microbial and photochemical degradation in a lake ecosystem. EE2 was detected at a concentration up to 11.1 ng L(-1). At this concentration EE2 may affect the reproduction of fish and other aquatic organisms in the lake due to its high estrogenic activity. EE2 was persistent to the biodegradation by the microorganisms in the lake. Under aerobic conditions a long lag phase (42 days) was observed before the biodegradation of EE2 and a half-life of 108 days was estimated. Under anaerobic conditions, EE2 experienced even a longer acclimation stage (63 days) and a slower microbial degradation in the lake water. The photodegradation of EE2 was rapid in the lake surface water under natural sunlight, with a half-life of less than 2 days in summer sunny days. Compared to biodegradation, photodegradation may represent a predominant removal mechanism for EE2 in natural surface waters.
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Affiliation(s)
- Yuegang Zuo
- Department of Chemistry and Biochemistry, University of Massachusetts Dartmouth, 285 Old Westport Road, North Dartmouth, MA 02747, USA.
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23
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Card ML, Schnoor JL, Chin YP. Transformation of natural and synthetic estrogens by maize seedlings. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2013; 47:5101-5108. [PMID: 23488817 DOI: 10.1021/es3040335] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
In agricultural fields, crop plants may transform or degrade hormonally active compounds in manure used as fertilizer and thereby affect the overall endocrine-disrupting activity of agricultural runoff. This study examined the transformation of two natural steroid estrogens [17β-estradiol (17β-E2) and estrone (E1)] and two synthetic estrogen mimics [zeranol (α-ZAL) and zearalanone (ZAN)] by maize seedlings. Growing whole maize seedlings in hydroponic solutions of target estrogens resulted in both oxidative (i.e., 17β-E2 to E1 and α-ZAL to ZAN) and reductive (i.e., E1 to 17β-E2 and ZAN to α-ZAL) transformations. Although all four estrogens accumulated in maize roots as both parents and products, the shoots contained only 17β-E2 and α-ZAL, regardless of whether they were the parent or the product. Crude plant enzyme extracts led to substantial reductive transformations but created only trace amounts of oxidation products. In contrast, only oxidative transformations occurred in solutions exposed to plant-associated microbes. Thus, the combined effects of plant enzymes and plant-associated microbes account for the reversible transformations observed with whole plants. These effects are expected to generally decrease the overall estrogenicity of runoff from manure-fertilized fields.
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Affiliation(s)
- Marcella L Card
- Environmental Science Graduate Program, The Ohio State University, 125 South Oval Mall, Columbus, Ohio 43210, United States.
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24
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Wang B, Huang B, Jin W, Zhao S, Li F, Hu P, Pan X. Occurrence, distribution, and sources of six phenolic endocrine disrupting chemicals in the 22 river estuaries around Dianchi Lake in China. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2013; 20:3185-94. [PMID: 23054796 DOI: 10.1007/s11356-012-1236-y] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/04/2012] [Accepted: 09/26/2012] [Indexed: 05/17/2023]
Abstract
The objectives of this study are to track the occurrence, distribution, and sources of phenolic endocrine disrupting compounds (EDCs) in the 22 rivers around Dianchi Lake in China, to estimate the input and output amounts of phenolic EDCs in the water system, and to provide more comprehensive fundamental data for risk assessment and contamination control of phenolic EDCs in aquatic environment. Six phenolic EDCs were systematically evaluated in water and surface sediment in the estuaries of those rivers. The water and sediment samples were preconcentrated by solid-phase extraction system and microwave-assisted extraction system, respectively. Phenolic EDCs were analyzed by GC-MS (Thermo Fisher Scientific, USA) after derivatization. Phenolic EDCs were found ubiquitously in the aquatic environment. The total concentrations ranged from 248 to 4,650 ng/L in water, and 113 to 3,576 ng/g dry weight in surface sediment. The residue amount of phenolic EDCs in Dianchi Lake was 258 kg/a. Concentrations of the phenolic EDCs in the Lake decreased with increase in distance to the estuaries of those rivers which run through urban and industrial areas. The rivers seriously contaminated by phenolic EDCs were Xin River, Yunliang River, Chuanfang River, Cailian River, Jinjia River, Zhengda River, and Daqing River which run through the old area of Kunming City. Satisfying correlations were observed between the concentrations of the target compounds in water and in surface sediment. NP1EO, NP2EO, and BPA were identified as the three predominant phenolic EDCs. There were significant correlations between phenolic EDCs and many basic water quality parameters. Urban and industrial areas are the major contributors for phenolic EDCs, especially in Kunming City. Compositional profiles of phenolic EDCs in surface sediment were similar to those in river water. The concentrations of phenolic EDCs in the rivers located in the northwest part of the valley were very high, and posed a potential risk to aquatic organisms and even human. The concentrations of NP2EO, NP1EO, and BPA were at moderate levels of other areas. The basic water quality parameters (TOC, TN, DO, and pH) play important roles on the distribution, fate, and behavior of phenolic EDCs in the valley.
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Affiliation(s)
- Bin Wang
- Faculty of Environmental Science and Engineering, Kunming University of Science and Technology, Kunming, Yunnan 650500, People's Republic of China
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25
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Abdel-Khalik J, Björklund E, Hansen M. Simultaneous determination of endogenous steroid hormones in human and animal plasma and serum by liquid or gas chromatography coupled to tandem mass spectrometry. J Chromatogr B Analyt Technol Biomed Life Sci 2013; 928:58-77. [PMID: 23598050 DOI: 10.1016/j.jchromb.2013.03.013] [Citation(s) in RCA: 46] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2012] [Revised: 03/05/2013] [Accepted: 03/13/2013] [Indexed: 01/20/2023]
Abstract
Analytical methodologies based on liquid or gas chromatography coupled to tandem mass spectrometry for the simultaneous determination of two or more endogenous steroid hormones in human and animal plasma and serum has received increased attention the last few years. Especially in the clinical setting steroid profiling is of major importance in disease diagnostics. This paper discusses recent findings in such multi-steroid hormone procedures published from 2001 to 2012. The aim was to elucidate possible relationships between chosen analytical technique and the obtained analyte sensitivity for endogenous steroid hormones. By evaluating the success, at which the currently applied techniques have been utilized, more general knowledge on the field is provided. Furthermore the evaluation provides directions in which future studies may be interesting to conduct.
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Affiliation(s)
- Jonas Abdel-Khalik
- Toxicology Laboratory, Analytical Biosciences, Department of Pharmacy, Faculty of Health and Medical Sciences, University of Copenhagen, Universitetsparken 2, DK-2100 Copenhagen, Denmark.
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26
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Tomšíková H, Aufartová J, Solich P, Nováková L, Sosa-Ferrera Z, Santana-Rodríguez JJ. High-sensitivity analysis of female-steroid hormones in environmental samples. Trends Analyt Chem 2012. [DOI: 10.1016/j.trac.2011.11.008] [Citation(s) in RCA: 81] [Impact Index Per Article: 6.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
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27
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Wang SY, Yang L, Zu YG, Zhao CJ, Sun XW, Zhang L, Zhang ZH. Design and Performance Evaluation of Ionic-Liquids-Based Microwave-Assisted Environmentally Friendly Extraction Technique for Camptothecin and 10-Hydroxycamptothecin from Samara of Camptotheca acuminata. Ind Eng Chem Res 2011. [DOI: 10.1021/ie201370m] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Shu-ya Wang
- Key Laboratory of Forest Plant Ecology, Northeast Forestry University, 150040 Harbin, People’s Republic of China
| | - Lei Yang
- Key Laboratory of Forest Plant Ecology, Northeast Forestry University, 150040 Harbin, People’s Republic of China
| | - Yuan-gang Zu
- Key Laboratory of Forest Plant Ecology, Northeast Forestry University, 150040 Harbin, People’s Republic of China
| | - Chun-jian Zhao
- Key Laboratory of Forest Plant Ecology, Northeast Forestry University, 150040 Harbin, People’s Republic of China
| | - Xiao-wei Sun
- Key Laboratory of Forest Plant Ecology, Northeast Forestry University, 150040 Harbin, People’s Republic of China
| | - Lin Zhang
- Key Laboratory of Forest Plant Ecology, Northeast Forestry University, 150040 Harbin, People’s Republic of China
| | - Zhong-hua Zhang
- Key Laboratory of Forest Plant Ecology, Northeast Forestry University, 150040 Harbin, People’s Republic of China
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28
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The role of the acquisition methods in the analysis of natural and synthetic steroids and cholic acids by gas chromatography–mass spectrometry. J Chromatogr A 2011; 1218:8264-72. [DOI: 10.1016/j.chroma.2011.09.006] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/20/2011] [Revised: 09/02/2011] [Accepted: 09/05/2011] [Indexed: 11/23/2022]
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29
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Simultaneous determination of eleven sex hormones in antler velvet health products by gas chromatography-tandem mass spectrometry. Se Pu 2011; 29:558-62. [DOI: 10.3724/sp.j.1123.2011.00558] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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30
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Karimi E, Jaafar HZ. HPLC and GC-MS determination of bioactive compounds in microwave obtained extracts of three varieties of Labisia pumila Benth. Molecules 2011; 16:6791-805. [PMID: 21829154 PMCID: PMC6264234 DOI: 10.3390/molecules16086791] [Citation(s) in RCA: 54] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2011] [Revised: 07/28/2011] [Accepted: 08/01/2011] [Indexed: 12/22/2022] Open
Abstract
Microwave extraction of phytochemicals from medicinal plant materials has generated tremendous research interest and shown great potential. This research highlights the importance of microwave extraction in the analysis of flavonoids, isoflavonoid and phenolics and the antioxidant properties of extracts from three varieties of the Malaysian medicinal herb, Labisia pumila Benth. High and fast extraction performance ability, equal or higher extraction efficiencies than other methods, and the need for small samples and reagent volumes are some of the attractive features of this new promising microwave assisted extraction (MAE) technique. The aims of the present research were to determine the foliar phenolics and flavonoids contents of extracts of three varieties of L. pumila obtained by a microwave extraction method while flavonoid, isoflavonoid and phenolic compounds were analyzed using RP-HPLC. Furthermore, the antioxidant activities were measured by the DPPH and FRAP methods and finally, the chemical composition of the crude methanolic extracts of the leaves of all three varieties were analyzed by GS-MS.
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Affiliation(s)
| | - Hawa Z.E. Jaafar
- Department of Crop Science, Faculty of Agriculture, University Putra Malaysia, UPM Serdang, Selangor 43400, Malaysia;
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31
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Wang C, Xu C, Chen F, Tang X. Simultaneous determination of three naturally occurring estrogens in environmental waters by high-performance liquid chromatography. J Sep Sci 2011; 34:2371-5. [PMID: 21793210 DOI: 10.1002/jssc.201100445] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2011] [Revised: 06/07/2011] [Accepted: 06/07/2011] [Indexed: 11/12/2022]
Abstract
A simple, sensitive and accurate reversed-phase high-performance liquid chromatographic (HPLC) method for simultaneous determination of three naturally occurring estrogenic steroids including estrone (E1), 17β-estradiol (E2) and estriol (E3) in environmental water samples was developed. Analytes were extracted with ethyl acetate solvents and preconcentrated prior to HPLC analysis. Separations were accomplished in <20 min using a reversed-phase C(18) column (4.6×250 mm id, 5 μm) with a gradient elution of mobile phase containing 3.0 mM ammonium acetate/acetonitrile mixtures (flow rate, 1.0 mL/min). UV light absorption responses at 205 nm were linear over a wide concentration range from 100,000 μg/L to the detection limits of 0.96 μg/L E1, 0.64 μg/L E2 and 0.78 μg/L E3. Quantitation was carried out by the peak area method. The relative standard deviation for the analysis of three estrogens was <3.0%. This method was applied for the simultaneous determination of estrogens in environmental water samples collected in Zhejiang, China. The higher concentrations of both E2 and E3 were found in Tang River and West Lake waters, and E1 was detected in lake water only. All three estrogens were below the detection limits in rain waters.
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Affiliation(s)
- Chengjun Wang
- College of Chemistry and Materials Engineering Wenzhou University, Wenzhou, PR China.
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32
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Xu X, Zhao X, Zhang Y, Li D, Su R, Yang Q, Li X, Zhang H, Zhang H, Wang Z. Microwave-accelerated derivatization prior to GC-MS determination of sex hormones. J Sep Sci 2011; 34:1455-62. [PMID: 21567948 DOI: 10.1002/jssc.201100033] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/13/2011] [Revised: 03/20/2011] [Accepted: 04/02/2011] [Indexed: 11/10/2022]
Abstract
A new microwave-accelerated derivatization method was developed for rapid determination of 13 natural sex hormones in feeds. Sex hormones were isolated from the sample matrix by ultrasonic extraction, followed by solid-phase extraction, derivatized under microwave irradiation, and then analyzed directly by gas chromatography-mass spectrometry (GC-MS) in selective ion monitoring (SIM) mode. The key parameters affecting derivatization efficiency, including microwave irradiation time, microwave power, and reaction solvent were studied. Under microwave power of 360 W and microwave irradiation for 3 min, 13 natural sex hormones were simultaneously derivatized using heptafluorobutyric acid anhydride (HFBA) as derivatization reagent. This method was applied to the determination of 13 natural sex hormones in different feed samples, and the obtained results were compared with those obtained by the traditional thermal derivatization. The recoveries from 58.1 to 111% were obtained at sex hormone concentrations of 10-300 μg/kg with RSDs ≤12.0%. The results showed that the proposed method was fast, simple, efficient and can be applied to the determination of 13 natural sex hormones in different feed samples.
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Affiliation(s)
- Xu Xu
- Department of Chemistry, Jilin University, Changchun, PR China
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33
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Zuo Y, Zhang K, Wu J, Men B, He M. Determination of o-phthalic acid in snow and its photochemical degradation by capillary gas chromatography coupled with flame ionization and mass spectrometric detection. CHEMOSPHERE 2011; 83:1014-1019. [PMID: 21376367 DOI: 10.1016/j.chemosphere.2011.02.008] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/02/2010] [Revised: 02/03/2011] [Accepted: 02/03/2011] [Indexed: 05/30/2023]
Abstract
Phthalic acid and its photochemical degradation has been determined in snow and rainwater samples collected during winters (2003-2010) in the Southeast of Massachusetts using capillary gas chromatography (GC) with flame ionization and mass spectrometric detection. Water samples were dried using a rotary evaporator and derivatized with a 14% BF(3)/methanol reagent before GC analysis. The developed method proved simple and accurate. Phthalic acid was found in snow samples collected in a concentration range of 7.22-76.5 nM. The photodegradation of phthalate was carried out under 300 nm UV light. The direct photodecomposition of the acid is slow (5%h(-1)). However, the addition of dissolved Fe(III) species at 2.0 μM accelerated the light-induced degradation of phthalic acid by 3.5 times in the atmospheric water samples. Photodegradation rates of phthalic acid increases with decreasing pH value of water samples in the range of pH 2.8-4.5.
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Affiliation(s)
- Yuegang Zuo
- Department of Chemistry and Biochemistry, Universityof Massachusetts Dartmouth, North Dartmouth, MA, USA.
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34
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Luque de Castro M, Priego-Capote F, Peralbo-Molina A. The role of ultrasound in analytical derivatizations. J Chromatogr B Analyt Technol Biomed Life Sci 2011; 879:1189-95. [DOI: 10.1016/j.jchromb.2010.09.002] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/05/2010] [Revised: 08/19/2010] [Accepted: 09/01/2010] [Indexed: 10/19/2022]
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35
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Andrási N, Helenkár A, Záray G, Vasanits A, Molnár-Perl I. Derivatization and fragmentation pattern analysis of natural and synthetic steroids, as their trimethylsilyl (oxime) ether derivatives by gas chromatography mass spectrometry: Analysis of dissolved steroids in wastewater samples. J Chromatogr A 2011; 1218:1878-90. [DOI: 10.1016/j.chroma.2011.01.051] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/04/2010] [Revised: 01/13/2011] [Accepted: 01/17/2011] [Indexed: 12/29/2022]
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36
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Simultaneous Determination of Steroid Endocrine Disrupting Chemicals in Water by Solid Phase Extraction-Derivatization- Gas Chromatographic-Mass Spectrometry. CHINESE JOURNAL OF ANALYTICAL CHEMISTRY 2011. [DOI: 10.1016/s1872-2040(10)60431-8] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
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37
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Zheng M, Wang L, Bi Y, Liu F. Improved method for analyzing the degradation of estrogens in water by solid-phase extraction coupled with ultra performance liquid chromatography-ultraviolet detection. J Environ Sci (China) 2011; 23:693-698. [PMID: 21793415 DOI: 10.1016/s1001-0742(10)60439-1] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 05/31/2023]
Abstract
We established an improved method for the determination of four estrogens including estriol (E3), 17beta-estradiol (E2), 17alpha-ethynylestrodiol (EE2) and estrone (El) in water. The method consisted of solid-phase extraction (0.5 L water) and subsequent analysis of analytes by ultra-performance liquid chromatography (UPLC) with an ultraviolet detector (UVD). Base-line separation was achieved for all studied estrogens using a column (50 mm x 2.1 mm) packed with 1.7 microm particle size stationary phase. Recovery was higher than 88% and detection limits ranged between 12.5-23.7 ng/L for the four estrogens, with the RSD ranging from 7% to 11%. The method was successfully applied to determine E2 and EE2 in simulated natural water, which found that about 70% of E2 was degraded (with a half-life of about 30 hr) within 48 hr and about 55% of EE2 was degraded (with a half-life of about 36 hr). Low levels of E1 were found, however E3 was undetectable during the process.
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Affiliation(s)
- Minggang Zheng
- The First Institute of Oceanography, Qingdao 266101, China.
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38
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Optimization of large volume injection-programmable temperature vaporization-gas chromatography–mass spectrometry analysis for the determination of estrogenic compounds in environmental samples. J Chromatogr A 2010; 1217:8327-33. [DOI: 10.1016/j.chroma.2010.10.098] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/26/2010] [Revised: 10/19/2010] [Accepted: 10/25/2010] [Indexed: 11/21/2022]
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An examination of pentafluorobenzoyl derivatization strategies for the analysis of fatty alcohols using gas chromatography/electron capture negative ion chemical ionization-mass spectrometry. J Chromatogr B Analyt Technol Biomed Life Sci 2010; 879:1375-83. [PMID: 21094100 DOI: 10.1016/j.jchromb.2010.10.031] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/29/2010] [Revised: 09/27/2010] [Accepted: 10/27/2010] [Indexed: 10/18/2022]
Abstract
Gas chromatography/electron capture negative ion chemical ionization-mass spectrometry (GC/ECNICI-MS) combined with pentafluorobenzoyl derivatization (PFBoyl) is frequently used for the sensitive detection of fatty alcohols (FOH). However, this derivatization technique suffers from a lack of established reaction protocols, time-consuming reactions, and the presence of reagent artifacts or unwanted derivatization by-products which can hinder analyte detection. Here, strategies are presented to reduce the problems associated with PFBoyl-derivatization, including (1) the optimization of reaction conditions (derivatization time and temperature) for a variety of PFBoyl-derivatized FOH, (2) an investigation of microwave-accelerated derivatization (MAD) as a rapid alternative heating mechanism for the PFBoyl-derivatization of FOH, and (3) an analysis of an alternative strategy employing a solvent extraction procedure post-derivatization to reduce the detrimental effects commonly associated with PFBoyl derivatization reagents. The optimal reaction conditions for the PFBoyl-derivatization of FOH were determined to be 60°C for 45 min. The investigation in MAD demonstrated the potential of obtaining comparable PFBoyl-derivatizations to those obtained using traditional heating methods, albeit in a reaction time of 3 min. An examination of several solvents for post-derivatization extraction revealed improved relative response factors in comparison to those obtained without solvent extraction. The best solvents for the PFBoyl-FOH extraction, dichloromethane and tert-butyl methyl ether, were also compared to the no solvent extraction samples with standard response curves and PFBoyl-derivatized FOH in Bligh-Dyer extracted rat plasma.
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Accelerated sample treatment for screening of banned doping substances by GC–MS: ultrasonication versus microwave energy. Anal Bioanal Chem 2010; 399:861-75. [DOI: 10.1007/s00216-010-4319-y] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2010] [Revised: 09/15/2010] [Accepted: 10/10/2010] [Indexed: 10/18/2022]
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41
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Fang K, Pan X, Huang B, Liu J, Wang Y, Gao J. Simultaneous Derivatization of Hydroxyl and Ketone Groups for the Analysis of Steroid Hormones by GC–MS. Chromatographia 2010. [DOI: 10.1365/s10337-010-1736-1] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/05/2022]
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42
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Galesio M, Rial-Otero R, Simal-Gándara J, de la Torre X, Botrè F, Capelo-Martínez JL. Improved ultrasonic-based sample treatment for the screening of anabolic steroids by gas chromatography/mass spectrometry. RAPID COMMUNICATIONS IN MASS SPECTROMETRY : RCM 2010; 24:2375-2385. [PMID: 20635322 DOI: 10.1002/rcm.4654] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/29/2023]
Abstract
A rapid sample treatment procedure for the gas chromatography/mass spectrometry (GC/MS) determination of anabolic steroids in human urine has been developed. The new procedure makes use of ultrasonic energy to reduce reaction times and increase the overall sensitivity. The following variables affecting the performance of the ultrasonic treatment were optimised: (i) time, (ii) device, (iii) frequency, and (iv) temperature. It was found that, under an ultrasonic field, the hydrolysis of conjugated steroids with beta-glucuronidase from Escherichia coli K12 was possible with a treatment time of 10 min. The accuracy and precision of the ultrasonic method were found to be in agreement with those achieved with the conventional thermal conductivity procedure (Student's t-test; p = 0.05, n = 10). After the enzymatic hydrolysis, the derivatisation of the target compounds with trimethylsilyl (TMS) reagent, methyl-N-trimethylsilyltrifluoroacetamide (MSTFA)/NH(4)I/dithioerythritol (DTE) (1000:2:4, v/w/w), was also accelerated using ultrasonic energy. In order to test the applicability of the use of ultrasonic energy in the acceleration of the derivatisation reaction with TMS, the classic method of thermal conductivity was applied for comparative purposes to a pool of 35 androgenic anabolic steroids (AAS) and/or their metabolites. The results demonstrated that after 3 min of sonication in a Sonoreactor device (50% amplitude), 19 of the 35 compounds studied showed similar reaction yield to those obtained with the classic procedure requiring 30 min (Student's t-test; p = 0.05, n = 5); 13 increased to higher silylation yields; and for the steroids 1-testosterone, danazol and etiocholanolone-D5, the same results were obtained using a sonication time of 5 min.The overall applicability of the ultrasonic-based sample treatment method is shown by the analysis of five urine samples. The results are similar to those achieved by the routine procedure. The new method is fast, robust, and allows high sample throughput.
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Affiliation(s)
- M Galesio
- REQUIMTE, Departamento de Química, Faculdade de Ciências e Tecnología, Universidade Nova de Lisboa, 2829-516 Monte de Caparica, Portugal
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Microwave-accelerated derivatization for capillary electrophoresis with laser-induced fluorescence detection: A case study for determination of histidine, 1- and 3-methylhistidine in human urine. Talanta 2010; 82:72-7. [DOI: 10.1016/j.talanta.2010.03.061] [Citation(s) in RCA: 42] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/18/2010] [Revised: 03/25/2010] [Accepted: 03/27/2010] [Indexed: 11/19/2022]
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Kouremenos KA, Harynuk JJ, Winniford WL, Morrison PD, Marriott PJ. One-pot microwave derivatization of target compounds relevant to metabolomics with comprehensive two-dimensional gas chromatography. J Chromatogr B Analyt Technol Biomed Life Sci 2010; 878:1761-70. [PMID: 20493787 DOI: 10.1016/j.jchromb.2010.04.036] [Citation(s) in RCA: 33] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/12/2010] [Revised: 04/23/2010] [Accepted: 04/23/2010] [Indexed: 11/27/2022]
Abstract
Metabolomics has been defined as the quantitative measurement of all low molecular weight metabolites (sugars, amino acids, organic acids, fatty acids and others) in an organism's cells at a specified time under specific environmental/biological conditions. Currently, there is considerable interest in developing a single method of derivatization and separation that satisfies the needs for metabolite analysis while recognizing the many chemical classes that constitute the metabolome. Chemical derivatization considerably increases the sensitivity and specificity of gas chromatography-mass spectrometry for compounds that are polar and have derivatizable groups. Microwave-assisted derivatization (MAD) of a set of standards spanning a wide range of metabolites of interest demonstrates the potential of MAD for metabolic profiling. A final protocol of 150 W power for 90 s was selected as the derivatization condition, based upon the study of each chemical class. A study of the generation of partially derivatized components established the conditions where this could potentially be a problem; the use of greater volumes of reagent ensured this would not arise. All compounds analyzed by comprehensive two-dimensional gas chromatography-time-of-flight mass spectrometry in a standard mixture showed good area ratio reproducibility against a naphthalene internal standard (RSD<10% in all but one case). Concentrations tested ranged from 1 microg/mL to 1000 microg/mL, and the calibration curves for the standard mixtures were satisfactory with regression coefficients generally better than 0.998. The application to gas chromatography-quadrupole mass spectrometry and comprehensive two-dimensional gas chromatography-time-of-flight mass spectrometry for a typical reference standard of relevance to metabolomics is demonstrated.
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Affiliation(s)
- Konstantinos A Kouremenos
- Australian Centre for Research on Separation Science, School of Applied Sciences, R.M.I.T. University, GPO Box 2476, Melbourne, Victoria, 3001, Australia
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Vallejo A, Usobiaga A, Martinez-Arkarazo I, Prieto A, Etxebarria N, Zuloaga O, Fernández LA. Ultrasonic-assisted derivatization of estrogenic compounds in a cup horn booster and determination by GC-MS. J Sep Sci 2010; 33:104-11. [PMID: 20024927 DOI: 10.1002/jssc.200900449] [Citation(s) in RCA: 15] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/08/2022]
Abstract
Cup horn boosters are miniaturized ultrasound baths that maximize efficiency and precision. The optimization of an ultrasonic-assisted derivatization step by means of a cup horn booster and the determination of estrone, 17beta-estradiol, estriol, 17alpha-ethynyl estradiol and mestranol was developed by GC-MS. Different derivatization reagents and solvents were studied for maximizing the di-derivatization of 17alpha-ethynyl estradiol under ultrasound energy. Only N,O-bis(trimethylsilyl)trifluoroacetamide with 1% of trimethylchlorosilane in pyridine gave satisfactory results and this mixture was further used in the optimization of the ultrasound assisted derivatization. The experiment designs included sonication time (1-10 min), sonication power (20-80%), sonication cycles (1-9), derivatization reagent volume (25-125 microL) and solvent volume (25-125 microL). Once the optimum conditions were fixed, the effect of organic matter and the frequency of the water bath change were studied. Finally, the validation of the analytical method was carried out using spiked natural and synthetic waters. Recoveries (natural (138-70%) and synthetic (112-89%)), the LODs (0.35-1.66 ng/L), and LOQs (1.16-5.52 ng/L) and the precision (0.2-5.3%) of the method were studied. This is the first work in the literature where a cup horn booster is used with the aim of minimizing derivatization time during the determination of estrogenic compounds.
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Affiliation(s)
- Asier Vallejo
- Department of Analytical Chemistry, University of Basque Country, Bilbao, Spain.
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46
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Söderholm SL, Damm M, Kappe CO. Microwave-assisted derivatization procedures for gas chromatography/mass spectrometry analysis. Mol Divers 2010; 14:869-88. [PMID: 20225067 DOI: 10.1007/s11030-010-9242-9] [Citation(s) in RCA: 55] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2009] [Accepted: 02/22/2010] [Indexed: 11/30/2022]
Abstract
In this review, published applications of microwave-assisted derivatization procedures for gas chromatography/mass spectrometry (GC/MS) are summarized. Among the broad range of analytical techniques available, GC/MS is still the method of choice for most high-throughput screening procedures in forensic/clinical toxicology, doping control and food and environmental analysis. Despite the many advantages of the GC/MS method, time-consuming derivatization steps are often required in order to obtain desirable chromatographic characteristics or to improve the stability and detectability of the target analytes. These derivatization processes typically require reaction times from 30 min up to several hours at elevated temperature. In contrast, microwave protocols have demonstrated to be able to reduce the time required for derivatization to a few minutes, and can thus very effectively shorten the overall analysis time, in particular when carried out in a high-throughput format. Herein, the literature in this field is summarized and recent experimental techniques for performing parallel GC/MS derivatization protocols are discussed.
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Affiliation(s)
- Sandra L Söderholm
- Christian Doppler Laboratory for Microwave Chemistry (CDLMC), Institute of Chemistry, Karl-Franzens-University Graz, Heinrichstrasse 28, 8010, Graz, Austria
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Prokai-Tatrai K, Bonds D, Prokai L. Simultaneous Measurement of 17β-Estradiol, 17α-Estradiol and Estrone by GC-Isotope Dilution MS/MS. Chromatographia 2010; 71:311-315. [PMID: 20625535 PMCID: PMC2901118 DOI: 10.1365/s10337-009-1441-0] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
Abstract
A convenient GC-MS/MS-based method was developed for the simultaneous measurement of 17β-estradiol, 17α-estradiol and estrone using liquid-liquid extraction, a single-step derivatization with N-(trimethylsilyl)imidazole and the corresponding deuterated estrogens as internal standards. Separation of these estrogens was achieved on a 50% phenyl polysilphenylene-siloxane bonded phase column. MS/MS response factors for the derivatized analytes and their corresponding internal standards were found to be practically identical. Therefore, analyte concentrations could be determined by multiplying the measured analyte to internal standard ion-current ratio with known molar concentration of the corresponding deuterated internal standards. Assay accuracies, determined from the analyses of quality control samples obtained by spiking known concentrations of analytes into charcoal-stripped human serum, were in the -11% to +14% range. Limits of quantitations were between 13 pg/mL and 21 pg/mL from this biological medium.
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Affiliation(s)
- Katalin Prokai-Tatrai
- Department of Molecular Biology and Immunology, University of North Texas Health Science Center, 3500 Camp Bowie Boulevard, Fort Worth, TX 76107, USA;
- Department of Pharmacology and Neuroscience, University of North Texas Health Science Center, 3500 Camp Bowie Boulevard, Fort Worth, TX 76107, USA
| | - Darius Bonds
- Department of Molecular Biology and Immunology, University of North Texas Health Science Center, 3500 Camp Bowie Boulevard, Fort Worth, TX 76107, USA;
| | - Laszlo Prokai
- Department of Molecular Biology and Immunology, University of North Texas Health Science Center, 3500 Camp Bowie Boulevard, Fort Worth, TX 76107, USA;
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Damm M, Rechberger G, Kollroser M, Kappe CO. Microwave-assisted high-throughput derivatization techniques utilizing silicon carbide microtiter platforms. J Chromatogr A 2010; 1217:167-70. [DOI: 10.1016/j.chroma.2009.11.071] [Citation(s) in RCA: 19] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/24/2009] [Revised: 11/18/2009] [Accepted: 11/23/2009] [Indexed: 11/26/2022]
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49
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Fiamegos YC, Karatapanis A, Stalikas CD. Microwave-assisted phase-transfer catalysis for the rapid one-pot methylation and gas chromatographic determination of phenolics. J Chromatogr A 2010; 1217:614-21. [DOI: 10.1016/j.chroma.2009.12.016] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2009] [Revised: 09/10/2009] [Accepted: 12/02/2009] [Indexed: 10/20/2022]
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50
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Microwave assisted phase-transfer catalytic ethoxylation of p-chloronitrobenzene—A kinetic study. J Taiwan Inst Chem Eng 2010. [DOI: 10.1016/j.jtice.2009.04.001] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/23/2022]
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