1
|
Li D, Huang W, Huang R. Analysis of environmental pollutants using ion chromatography coupled with mass spectrometry: A review. JOURNAL OF HAZARDOUS MATERIALS 2023; 458:131952. [PMID: 37399723 DOI: 10.1016/j.jhazmat.2023.131952] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/05/2023] [Revised: 06/17/2023] [Accepted: 06/26/2023] [Indexed: 07/05/2023]
Abstract
The rise of emerging pollutants in the current environment and requirements of trace analysis in complex substrates pose challenges to modern analytical techniques. Ion chromatography coupled with mass spectrometry (IC-MS) is the preferred tool for analyzing emerging pollutants due to its excellent separation ability for polar and ionic compounds with small molecular weight and high detection sensitivity and selectivity. This paper reviews the progress of sample preparation and ion-exchange IC-MS methods in the analysis of several major categories of environmental polar and ionic pollutants including perchlorate, inorganic and organic phosphorus compounds, metalloids and heavy metals, polar pesticides, and disinfection by-products in past two decades. The comparison of various methods to reduce the influence of matrix effect and improve the accuracy and sensitivity of analysis are emphasized throughout the process from sample preparation to instrumental analysis. Furthermore, the human health risks of these pollutants in the environment with natural concentration levels in different environmental medias are also briefly discussed to raise public attention. Finally, the future challenges of IC-MS for analysis of environmental pollutants are briefly discussed.
Collapse
Affiliation(s)
- Dazhen Li
- Sichuan Provincial Key Laboratory of Universities on Environmental Science and Engineering, MOE Key Laboratory of Deep Earth Science and Engineering, College of Architecture and Environment, Sichuan University, Chengdu 610065, China
| | - Weixiong Huang
- Hubei Key Laboratory of Yangtze Catchment Environmental Aquatic Science, School of Environmental Studies, China University of Geosciences, Wuhan 430078, Hubei, China.
| | - Rongfu Huang
- Sichuan Provincial Key Laboratory of Universities on Environmental Science and Engineering, MOE Key Laboratory of Deep Earth Science and Engineering, College of Architecture and Environment, Sichuan University, Chengdu 610065, China.
| |
Collapse
|
2
|
Ligina V, Martin R, Aiswarya MV, Mashirin KR, Chitra KC. Acute and sublethal effects of acrylamide on the freshwater fish Anabas testudineus (Bloch, 1792). ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:90835-90851. [PMID: 35879632 DOI: 10.1007/s11356-022-22155-0] [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: 11/23/2021] [Accepted: 07/19/2022] [Indexed: 06/15/2023]
Abstract
Acrylamide, a synthetic compound, has a wide range of industrial applications that find multiple ways to reach aquatic ecosystem. The median lethal concentration of acrylamide determined using probit analysis in the fish Anabas testudineus was 132 µg L-1 concentration together with altered behavioral patterns. Hematological and antioxidant status was evaluated at a sublethal concentration (one-tenth of LC50-96 h), i.e., 13.2 µg L-1 concentration for 24, 48, 72, and 96 h. A reduction in erythrocytes count, hemoglobin content, and packed cell volume with a significant (P < 0.05) increase in leukocyte counts and differential counts were observed. Erythrocyte indices like mean corpuscular volume (MCV) and mean corpuscular hemoglobin (MCH) increased, whereas the mean corpuscular hemoglobin concentration (MCHC) showed a significant (P < 0.05) decrease when compared with control groups. The activities of superoxide dismutase, catalase, and glutathione reductase in gill tissues showed significant (P < 0.05) reduction, whereas the levels of hydrogen peroxide and lipid peroxidation increased significantly (P < 0.05) indicating oxidative stress. The findings suggest that acrylamide at sublethal concentration caused alteration in hematological parameters and induced oxidative stress in gill tissue of the fish A. testudineus. Hence, restrictions on the use of acrylamide in food and industrial products are recommended since humans are the direct consumer of fish products.
Collapse
Affiliation(s)
- Velliyath Ligina
- Endocrinology and Toxicology Laboratory, Department of Zoology, University of Calicut, Malappuram District, Kerala, 673 635, India
| | - Ranjana Martin
- Endocrinology and Toxicology Laboratory, Department of Zoology, University of Calicut, Malappuram District, Kerala, 673 635, India
| | | | - Kajahussain Reeha Mashirin
- Endocrinology and Toxicology Laboratory, Department of Zoology, University of Calicut, Malappuram District, Kerala, 673 635, India
| | - Kumari Chidambaran Chitra
- Endocrinology and Toxicology Laboratory, Department of Zoology, University of Calicut, Malappuram District, Kerala, 673 635, India.
| |
Collapse
|
3
|
Wang X, Tang B, Bao L, Zhang H, He M, Yuan S. Degradation evaluation of acrylamide in advanced oxidation processes based on theoretical method: Mechanisms, kinetics, toxicity evaluation and the role of soil particles. JOURNAL OF HAZARDOUS MATERIALS 2022; 424:127592. [PMID: 34736216 DOI: 10.1016/j.jhazmat.2021.127592] [Citation(s) in RCA: 6] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/16/2021] [Revised: 10/12/2021] [Accepted: 10/21/2021] [Indexed: 06/13/2023]
Abstract
Acrylamide (AA) is now recognized as an imminent hazardous chemical in the aqueous environment, causing a potential threat to human health. As a neo-formed contaminant (NFC), the degradation measure of AA is largely lacking. In this work, we used quantum chemistry and experimental methods to identify the main degradation mechanism of AA in the UV/H2O2 advanced oxidation process (AOP) for the first time. Radical addition reactions dominate the •OH-initiated AA reaction, resulting in few toxic nitrosamines formation. The interaction between AA and the surface model of soil particles (SixOy(OH)z) is weak, and AA can rapidly migrate down to groundwater via seepage. However, the total rate constants of AA and COMADS2-AA with •OH are 2.75 × 109 and 2.09 × 109 M-1 s-1, and the removal of AA from aqueous and heterogeneous systems reaches 62.30% and 62.05% within 2 h. Whether in the aqueous-phase or on the surface of soil particles, •OH initiated AA reaction is an efficient way to remove AA. Furthermore, the toxicity of the main by-products of AA show less harmful to three aquatic organisms and rats than AA. UV/H2O2 AOP is evaluated as an efficient method to degrade AA while decreasing harm.
Collapse
Affiliation(s)
- Xueyu Wang
- Key Lab of Colloid and Interface Chemistry, Shandong University, Jinan 250100, China
| | - Bo Tang
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China
| | - Lei Bao
- School of Chemical Sciences, University of the Chinese Academy of Sciences, Beijing 100049, China
| | - Heng Zhang
- Key Lab of Colloid and Interface Chemistry, Shandong University, Jinan 250100, China
| | - Maoxia He
- Environment Research Institute, Shandong University, Qingdao 266237, China
| | - Shiling Yuan
- Key Lab of Colloid and Interface Chemistry, Shandong University, Jinan 250100, China.
| |
Collapse
|
4
|
Sirajuddin, Tagar ZA, Ul Haq MA, Shah MR, Mujeeb-ur-Rehman, Sherazi STH, Barek J, Kalhoro MS. Highly Sensitive Voltammetric Determination of Acrylamide Based on Ibuprofen Capped Mercury Nanoparticles. SENSORS (BASEL, SWITZERLAND) 2021; 21:7302. [PMID: 34770608 PMCID: PMC8587918 DOI: 10.3390/s21217302] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 08/23/2021] [Revised: 10/20/2021] [Accepted: 10/28/2021] [Indexed: 11/26/2022]
Abstract
Highly stable, small-sized and evenly distributed solid mercury nanoparticles capped with ibuprofen (Ibu-HgNPs) were prepared via reduction with hydrazine and capped with ibuprofen as a stabilizing agent. Characterization of Ibu-HgNPs was carried out by UV-Vis spectrophotometry and transmission electron microscopy (TEM). The prepared Ibu-HgNPs were immobilized onto a glassy carbon electrode (GCE) and used for the first time as the sensing element for voltammetric determination of low concentrations of acrylamide (AA) in aqueous solutions. Various parameters such as the type of supporting electrolyte, voltammetric mode, frequency, deposition time, stirring rate and initial potential were optimized to obtain the highest peak current of AA. The sensor delivered the best results in combination with the square wave voltammetry (SWV) mode, with good repeatability (relative standard deviation (RSD) of 25 repetitions was 1.4% for 1000 ppb AA). The study further revealed that Ibu-HgNPs are strongly adhered to GCE and hence do not contaminate the environment even after several runs. The newly developed AA sensor provides linear calibration dependence in the range of 100-1300 ppb with an R2 value of 0.996 and limit of detection (LOD) of 8.5 ppb. Negligible interference was confirmed from several organic compounds, cations and anions. The developed sensor was successfully applied for AA determination in various types of environmental real water samples to prove its practical usefulness and applicability.
Collapse
Affiliation(s)
- Sirajuddin
- International Center for Chemical and Biological Sciences, HEJ Research Institute of Chemistry, University of Karachi, Karachi 75270, Pakistan; (S.); (M.A.U.H.); (M.R.S.); (M.-u.-R.)
| | - Zulfiqar Ali Tagar
- National Center of Excellence in Analytical Chemistry, University of Sindh, Jamshoro 76080, Pakistan; (Z.A.T.); (S.T.H.S.)
| | - Muhammad Anwar Ul Haq
- International Center for Chemical and Biological Sciences, HEJ Research Institute of Chemistry, University of Karachi, Karachi 75270, Pakistan; (S.); (M.A.U.H.); (M.R.S.); (M.-u.-R.)
| | - Muhammad Raza Shah
- International Center for Chemical and Biological Sciences, HEJ Research Institute of Chemistry, University of Karachi, Karachi 75270, Pakistan; (S.); (M.A.U.H.); (M.R.S.); (M.-u.-R.)
| | - Mujeeb-ur-Rehman
- International Center for Chemical and Biological Sciences, HEJ Research Institute of Chemistry, University of Karachi, Karachi 75270, Pakistan; (S.); (M.A.U.H.); (M.R.S.); (M.-u.-R.)
| | - Syed Tufail Hussain Sherazi
- National Center of Excellence in Analytical Chemistry, University of Sindh, Jamshoro 76080, Pakistan; (Z.A.T.); (S.T.H.S.)
| | - Jiri Barek
- UNESCO Laboratory of Environmental Electrochemistry, Department of Analytical Chemistry, Faculty of Science, Charles University, Albertov 6, CZ-15843 Prague, Czech Republic
| | | |
Collapse
|
5
|
Cantrell MS, McDougal OM. Biomedical rationale for acrylamide regulation and methods of detection. Compr Rev Food Sci Food Saf 2021; 20:2176-2205. [PMID: 33484492 PMCID: PMC8394876 DOI: 10.1111/1541-4337.12696] [Citation(s) in RCA: 7] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/29/2020] [Revised: 11/12/2020] [Accepted: 11/30/2020] [Indexed: 12/21/2022]
Abstract
Acrylamide is the product of the Maillard reaction, which occurs when starchy, asparagine-rich foods including potato or grain products and coffee are fried, baked, roasted, or heated. Studies in rodents provide evidence that acrylamide is carcinogenic and a male reproductive harmful agent when administered in exceedingly high levels. A 2002 study identified acrylamide in popular consumer food and beverage products, stimulating the European Union (EU) and California to legislate public notice of acrylamide presence in fried and baked foods, and coffee products. The regulatory legislation enacted in the EU and California has scientists working to develop foods and processes aimed at reducing acrylamide formation and advancing rapid and accurate analytical methods for the quantitative and qualitative determination of acrylamide in food and beverage products. The purpose of this review is to survey the studies performed on rodents and humans that identified the potential health impact of acrylamide in the human diet, and provide insight into established and emerging analytical methods used to detect acrylamide in blood, aqueous samples, and food.
Collapse
Affiliation(s)
- Maranda S. Cantrell
- Department of Chemistry and Biochemistry, Boise State University, Boise, Idaho, USA
- Biomolecular Sciences Ph.D. Program, Boise State University, Boise, Idaho, USA
| | - Owen M. McDougal
- Department of Chemistry and Biochemistry, Boise State University, Boise, Idaho, USA
| |
Collapse
|
6
|
Kutlucinar KG, Hann S. Comparison of preconcentration methods for nontargeted analysis of natural waters using HPLC-HRMS: Large volume injection versus solid-phase extraction. Electrophoresis 2021; 42:490-500. [PMID: 33332608 PMCID: PMC7898308 DOI: 10.1002/elps.202000256] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/03/2020] [Revised: 12/11/2020] [Accepted: 12/14/2020] [Indexed: 11/24/2022]
Abstract
Nontargeted analysis of water samples using liquid chromatography combined with high‐resolution mass spectrometers is an emerging approach for surface water monitoring and evaluation of water treatment processes. In this study, sample preconcentration via direct, large volume injection with 500 μL and 1000 μL injection volumes was compared to SPE regarding analytical performance parameters in targeted and nontargeted workflows. In targeted analysis, the methods were evaluated in terms of LOD and intrabatch precision of the selected compounds, whereas in nontargeted analysis, the number of detected unknown compounds, the method's intra‐batch precision, and the retention time versus molecular mass pattern of the detected unknowns were evaluated. In addition, a novel intensity drift correction method was developed that is not based on quality control samples and makes use of the signals obtained for continuously infused reference compounds, which are conventionally utilized for online mass drift correction. It could be demonstrated that the new correction method significantly reduced the bias introduced by instrumental drift and is important for the reliable intercomparison of different nontargeted methods. Intercomparison of results showed that the 1000 μL large volume injection method revealed the best performance in terms of precision under repeatability conditions of measurement as well as lower LODs for targeted compound analysis. In nontargeted analysis, the SPE method detected a higher number of unknown compounds but exhibited also a higher uncertainty of measurement caused by matrix effects.
Collapse
Affiliation(s)
- Kaan Georg Kutlucinar
- Department of Chemistry, Institute of Analytical Chemistry, University of Natural Resources and Life Sciences, Vienna, Austria
| | - Stephan Hann
- Department of Chemistry, Institute of Analytical Chemistry, University of Natural Resources and Life Sciences, Vienna, Austria
| |
Collapse
|
7
|
Dugheri S, Mucci N, Bonari A, Marrubini G, Cappelli G, Ubiali D, Campagna M, Montalti M, Arcangeli G. Liquid phase microextraction techniques combined with chromatography analysis: a review. ACTA CHROMATOGR 2020. [DOI: 10.1556/1326.2019.00636] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Abstract
Sample pretreatment is the first and the most important step of an analytical procedure. In routine analysis, liquid–liquid microextraction (LLE) is the most widely used sample pre-treatment technique, whose goal is to isolate the target analytes, provide enrichment, with cleanup to lower the chemical noise, and enhance the signal. The use of extensive volumes of hazardous organic solvents and production of large amounts of waste make LLE procedures unsuitable for modern, highly automated laboratories, expensive, and environmentally unfriendly. In the past two decades, liquid-phase microextraction (LPME) was introduced to overcome these drawbacks. Thanks to the need of only a few microliters of extraction solvent, LPME techniques have been widely adopted by the scientific community. The aim of this review is to report on the state-of-the-art LPME techniques used in gas and liquid chromatography. Attention was paid to the classification of the LPME operating modes, to the historical contextualization of LPME applications, and to the advantages of microextraction in methods respecting the value of green analytical chemistry. Technical aspects such as description of methodology selected in method development for routine use, specific variants of LPME developed for complex matrices, derivatization, and enrichment techniques are also discussed.
Collapse
Affiliation(s)
- Stefano Dugheri
- 1 Industrial Hygiene and Toxicology Laboratory, Careggi University Hospital, Florence, Italy
| | - Nicola Mucci
- 2 Department of Experimental and Clinical Medicine, University of Florence, Florence, Italy
| | - Alessandro Bonari
- 2 Department of Experimental and Clinical Medicine, University of Florence, Florence, Italy
| | | | - Giovanni Cappelli
- 2 Department of Experimental and Clinical Medicine, University of Florence, Florence, Italy
| | - Daniela Ubiali
- 3 Department of Drug Sciences, University of Pavia, Pavia, Italy
| | - Marcello Campagna
- 4 Department of Medical Sciences and Public Health, University of Cagliari, Cagliari, Italy
| | - Manfredi Montalti
- 2 Department of Experimental and Clinical Medicine, University of Florence, Florence, Italy
| | - Giulio Arcangeli
- 2 Department of Experimental and Clinical Medicine, University of Florence, Florence, Italy
| |
Collapse
|
8
|
Sayah M, Kiarostami V. Rapid Analysis of Acrylamide in Tap and Well Water Samples by Solvent Terminated Dispersive Liquid-Liquid Microextraction Followed by GC-FID. BULLETIN OF ENVIRONMENTAL CONTAMINATION AND TOXICOLOGY 2019; 102:560-566. [PMID: 30859246 DOI: 10.1007/s00128-019-02575-4] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/09/2018] [Accepted: 02/19/2019] [Indexed: 06/09/2023]
Abstract
A fast, green and low cost method for analysis of acrylamide in tap and well water has been presented for the first time using solvent terminated-dispersive liquid liquid microextraction (ST-DLLME) with a simple equipment which does not need centrifugation step followed by GC-FID. The use of one variable at a time optimization method revealed that methanol and octanone were the superior disperser and extraction solvents, respectively. A central composite design (CCD) as a response surface methodology was used for multivariate optimization of five independent factors (volumes of extraction and dispersive solvents, pH, salt addition and extraction time) on the extraction efficiency. Under CCD optimal conditions, the linear range, detection limit (S/N = 3) and quantitation limit (S/N = 10) were 0.1, 0.3 and 0.3-550 ng mL-1, respectively. In these circumstances, the recoveries for real samples (tap and well water) spiked with 0.5, 1 and 10 ng g-1 were in the acceptable range (90.8%-94.1%). In comparison with other methods in the literature, the suggested ST-DLLME approach showed the best analytical performance. The presented green method has potential application as a routine method in the environmental and analytical laboratories for analysis of acrylamide in water samples.
Collapse
Affiliation(s)
- Maryam Sayah
- Department of Chemistry, North Tehran Branch, Islamic Azad University, Tehran, 1651153311, Iran
| | - Vahid Kiarostami
- Department of Chemistry, North Tehran Branch, Islamic Azad University, Tehran, 1651153311, Iran.
| |
Collapse
|
9
|
Sobhi HR, Ghambarian M, Behbahani M, Esrafili A. Application of modified hollow fiber liquid phase microextraction in conjunction with chromatography-electron capture detection for quantification of acrylamide in waste water samples at ultra-trace levels. J Chromatogr A 2017; 1487:30-35. [DOI: 10.1016/j.chroma.2017.01.051] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/18/2016] [Accepted: 01/22/2017] [Indexed: 10/20/2022]
|
10
|
Mnif I, Hurel C, Marmier N. Direct injection method for HPLC/MS/MS analysis of acrylamide in aqueous solutions: application to adsorption experiments. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2015; 22:6414-6422. [PMID: 25388555 DOI: 10.1007/s11356-014-3774-y] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/02/2014] [Accepted: 10/26/2014] [Indexed: 06/04/2023]
Abstract
Polyacrylamides are polymers used in many fields and represent the main source of release of the highly toxic acrylamide in the environment. In this work, a simple, rapid, and sensitive analytical method was developed with HPLC/MS/MS and direct injection for acrylamide analysis in water and adsorption samples. AFNOR standards NF T90-210 and NF T90-220 were used for the analytical method validation and uncertainty estimation. Limit of quantification (LOQ) for acrylamide was 1 μg/L, and accuracy was checked at three acrylamide levels (1, 6, and 10 μg/L). Uncertainties were estimated at 34.2, 22, and 12.4 % for acrylamide concentrations at LOQ, 6 μg/L, and 10 μg/L, respectively. Acrylamide adsorption on clays (kaolinite, illite) and sludge was then studied as a function of pH, time, and acrylamide concentrations. Acrylamide adsorption on kaolinite, illite, and sludge was found to be very weak since adsorption percentages were inferior to 10 %, whatever the pH value and the initial acrylamide concentration. The low affinity of acrylamide for clays and sludge is likely due to its hydrophilic property, small size, and charge neutrality.
Collapse
Affiliation(s)
- Ines Mnif
- ECOMERS, University Nice Sophia Antipolis, Parc Valrose, 28 Avenue Valrose, 06108, Nice Cedex 2, France,
| | | | | |
Collapse
|
11
|
Togola A, Coureau C, Guezennec AG, Touzé S. A sensitive analytical procedure for monitoring acrylamide in environmental water samples by offline SPE-UPLC/MS/MS. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2015; 22:6407-6413. [PMID: 25471720 DOI: 10.1007/s11356-014-3900-x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/03/2014] [Accepted: 11/23/2014] [Indexed: 06/04/2023]
Abstract
The presence of acrylamide in natural systems is of concern from both environmental and health points of view. We developed an accurate and robust analytical procedure (offline solid phase extraction combined with UPLC/MS/MS) with a limit of quantification (20 ng L(-1)) compatible with toxicity threshold values. The optimized (considering the nature of extraction phases, sampling volumes, and solvent of elution) solid phase extraction (SPE) was validated according to ISO Standard ISO/IEC 17025 on groundwater, surface water, and industrial process water samples. Acrylamide is highly polar, which induces a high variability during the SPE step, therefore requiring the use of C(13)-labeled acrylamide as an internal standard to guarantee the accuracy and robustness of the method (uncertainty about 25 % (k = 2) at limit of quantification level). The specificity of the method and the stability of acrylamide were studied for these environmental media, and it was shown that the method is suitable for measuring acrylamide in environmental studies.
Collapse
Affiliation(s)
- Anne Togola
- Bureau de recherches géologiques et minières (BRGM), 3 avenue Claude Guillemin, 45100, Orléans, France,
| | | | | | | |
Collapse
|
12
|
Kim TH, Shin S, Kim KB, Seo WS, Shin JC, Choi JH, Weon KY, Joo SH, Jeong SW, Shin BS. Determination of acrylamide and glycidamide in various biological matrices by liquid chromatography–tandem mass spectrometry and its application to a pharmacokinetic study. Talanta 2015; 131:46-54. [DOI: 10.1016/j.talanta.2014.07.042] [Citation(s) in RCA: 29] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/05/2014] [Revised: 07/14/2014] [Accepted: 07/15/2014] [Indexed: 11/28/2022]
|
13
|
Omar MMA, Elbashir AA, Schmitz OJ. Determination of acrylamide in Sudanese food by high performance liquid chromatography coupled with LTQ Orbitrap mass spectrometry. Food Chem 2014; 176:342-9. [PMID: 25624242 DOI: 10.1016/j.foodchem.2014.12.091] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/12/2014] [Revised: 12/20/2014] [Accepted: 12/20/2014] [Indexed: 10/24/2022]
Abstract
A sample preparation method based on modified Quick, Easy, Cheap Effective, Rugged and Safe (QuEChERS) with aluminum oxide (Al2O3) as dispersive solid phase extraction (dSPE) material and high performance liquid chromatography-linear trap quadruple-Orbitrap-mass spectrometry (HPLC LTQ-Orbitrap MS) was established. The performance of two analytical columns namely Kinetex C18 and Rezex ROA-organic acid was compared for acrylamide separation. The method was validated in term of matrix effect, linear range (standard addition method), limit of detection (LOD), limit of quantification (LOQ), precision (RSD%) and recovery. Good linearity (r(2)>0.9979) was achieved using standard addition method in the concentration range 0-200μgkg(-1). The LOD is in the range from 2.91 to 4.04μgkg(-1) and 1.50 to 3.94μgkg(-1) for C18 and ROA columns, respectively. The precision of the method was ⩽7.3% and 5.6% for C18 and ROA columns, respectively. Recoveries of acrylamide ranging from 90% to 97%, (n=3) were obtained. The proposed Al2O3 dSPE method was successfully applied to the analysis of acrylamide in real food samples.
Collapse
Affiliation(s)
- Mei Musa Ali Omar
- Applied Analytical Chemistry, Faculty of Chemistry, University of Duisburg-Essen, Essen, Germany; Department of Chemistry, Faculty of Science, University of Khartoum, Khartoum 11115, Sudan; Central Laboratory, Ministry of Sciences & Technology, P.O. Box Office 7099, Khartoum, Sudan
| | - Abdalla Ahmed Elbashir
- Applied Analytical Chemistry, Faculty of Chemistry, University of Duisburg-Essen, Essen, Germany; Department of Chemistry, Faculty of Science, University of Khartoum, Khartoum 11115, Sudan.
| | - Oliver J Schmitz
- Applied Analytical Chemistry, Faculty of Chemistry, University of Duisburg-Essen, Essen, Germany.
| |
Collapse
|
14
|
The determination of acrylamide in environmental and drinking waters by large-volume injection – hydrophilic-interaction liquid chromatography and tandem mass spectrometry. J Chromatogr A 2014; 1334:72-8. [DOI: 10.1016/j.chroma.2014.02.005] [Citation(s) in RCA: 42] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2013] [Revised: 01/27/2014] [Accepted: 02/02/2014] [Indexed: 11/23/2022]
|
15
|
Can NO, Arli G. ANALYSIS OF ACRYLAMIDE IN TRADITIONAL AND NONTRADITIONAL FOODS IN TURKEY USING HPLC–DAD WITH SPE CLEANUP. J LIQ CHROMATOGR R T 2014. [DOI: 10.1080/10826076.2012.758148] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Affiliation(s)
- Nafiz Oncu Can
- a Department of Analytical Chemistry , Faculty of Pharmacy, Anadolu University , Yunusemre Campus , Eskisehir , Turkey
| | - Goksel Arli
- a Department of Analytical Chemistry , Faculty of Pharmacy, Anadolu University , Yunusemre Campus , Eskisehir , Turkey
| |
Collapse
|
16
|
Lim HH, Shin HS. Ultra trace level determinations of acrylamide in surface and drinking water by GC-MS after derivatization with xanthydrol. J Sep Sci 2013; 36:3059-66. [PMID: 23836628 DOI: 10.1002/jssc.201300209] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/25/2013] [Revised: 06/07/2013] [Accepted: 06/11/2013] [Indexed: 11/06/2022]
Abstract
A sensitive GC-MS method has been established for the determination of acrylamide in surface and drinking water based on derivatization with xanthydrol. Deuterated acrylamide (acrylamide-d3 ) was chosen as the internal standard for analyzing the water sample. The derivatization of acrylamide was performed directly in water, and the best reaction conditions (xanthydrol of 1.6 mM, HCl concentration of 0.05 M, reaction for 30 min at ambient temperature) were established by variation of parameters. Under the established conditions, the detection and quantification limits were 3.0 and 9.7 ng/L, respectively, and the interday RSD was less than 8% at concentrations of 20 and 100 ng/L.
Collapse
Affiliation(s)
- Hyun-Hee Lim
- Department of Environmental Science, Kongju National University, Kongju, Republic of Korea
| | | |
Collapse
|
17
|
|
18
|
Characterization of liquid chromatography-tandem mass spectrometry method for the determination of acrylamide in complex environmental samples. Anal Bioanal Chem 2013; 405:4159-66. [DOI: 10.1007/s00216-013-6822-4] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2012] [Revised: 01/31/2013] [Accepted: 02/01/2013] [Indexed: 11/26/2022]
|
19
|
Backe WJ, Field JA. Is SPE necessary for environmental analysis? A quantitative comparison of matrix effects from large-volume injection and solid-phase extraction based methods. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2012; 46:6750-6758. [PMID: 22626028 DOI: 10.1021/es300235z] [Citation(s) in RCA: 36] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Environmental analysis by large-volume injection (LVI) was compared to solid-phase extraction (SPE) based methods using matrix effects as a quantitative indicator of analytical signal quality. LVI was performed by the direct injection of 900 μL of wastewater onto a high-performance liquid chromatography (HPLC) column while SPE-based methods utilized octadecyl silane (C18) and hydrophobic-lypophilic balance (HLB) solid phases to preconcentrate wastewater prior to analysis. Model analytes from three classes of environmental contaminants were selected for study including four estrogens (estrone, estradiol, estriol, and ethinylestradiol), eight perfluoroalkyl carboxylates (C4-C11), and five perfluoroalkyl sulfonates (C4, C6-C8, and C10). The matrix effects on analytes were assessed by two approaches (quantitatively by calculating percent matrix effects and qualitatively with postcolumn infusions) and compared across LVI- and SPE-based methods at constant (high and low) analyte-to-matrix mass ratios. The results from this study demonstrated that the LVI-based method produced analytical signals of quality similar to the two SPE-based methods. Furthermore, LVI presented a clear advantage over SPE because it was performed at lower cost, required fewer materials, involved less labor and eliminated the analyte loss associated with SPE.
Collapse
Affiliation(s)
- Will J Backe
- Chemistry Department, 153 Gilbert Hall, Oregon State University, Corvallis, Oregon 97331-4003, United States
| | | |
Collapse
|
20
|
Trace analysis of environmental matrices by large-volume injection and liquid chromatography–mass spectrometry. Anal Bioanal Chem 2011; 402:175-86. [DOI: 10.1007/s00216-011-5290-y] [Citation(s) in RCA: 41] [Impact Index Per Article: 3.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/28/2011] [Revised: 07/23/2011] [Accepted: 07/26/2011] [Indexed: 10/17/2022]
|
21
|
|
22
|
Zargar B, Sahraie NR, Khoshnam F. Catalytic Square-Wave Voltammetric Determination of Acrylamide in Potato Chips. ANAL LETT 2009. [DOI: 10.1080/00032710902954441] [Citation(s) in RCA: 11] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
|
23
|
Annola K, Keski-Rahkonen P, Vähäkangas K, Lehtonen M. Simultaneous determination of acrylamide, its metabolite glycidamide and antipyrine in human placental perfusion fluid and placental tissue by liquid chromatography-electrospray tandem mass spectrometry. J Chromatogr B Analyt Technol Biomed Life Sci 2008; 876:191-7. [PMID: 19010089 DOI: 10.1016/j.jchromb.2008.10.044] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2008] [Revised: 10/22/2008] [Accepted: 10/23/2008] [Indexed: 11/18/2022]
Abstract
A rapid and sensitive method using liquid chromatography-tandem mass spectrometry (LC-MS/MS) was developed for the simultaneous determination of acrylamide (AA) and its genotoxic metabolite glycidamide (GA) with a test marker antipyrine (AP) in placental tissue and perfusion medium used in human placental perfusion studies. An internal standard ((13)C-acrylamide) was added to the samples which were then deproteinized with acetonitrile. Chromatographic separation was performed on a reversed phase column with a gradient elution of acetonitrile and 0.01% formic acid at a flow rate of 0.3 mL/min. Detection and quantification of the analytes were carried out with a triple quadrupole mass spectrometer using positive electrospray ionization (ESI) and multiple reaction monitoring (MRM). The method was validated and linear over a concentration range of 0.5-20 microg/mL for acrylamide and glycidamide and 5-200 microg/mL for antipyrine. The lower limit of quantification for acrylamide and glycidamide was 0.5 microg/mL and for antipyrine 5 microg/mL. The method was selective, and good accuracy, precision, recovery, and stability were obtained for concentrations within the standard curve. The method was successfully used to analyze the placental perfusion medium and tissue samples in a toxicokinetic study for transplacental transfer of acrylamide and glycidamide. This is the first time that acrylamide, glycidamide and antipyrine are measured simultaneously.
Collapse
Affiliation(s)
- Kirsi Annola
- University of Kuopio, Department of Pharmacology and Toxicology, P.O. Box 1627, 70211 Kuopio, Finland.
| | | | | | | |
Collapse
|
24
|
Determination of acrylamide in starch-based foods by ion-exclusion liquid chromatography. J Food Compost Anal 2008. [DOI: 10.1016/j.jfca.2007.09.003] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
|
25
|
Alpmann A, Morlock G. Rapid and sensitive determination of acrylamide in drinking water by planar chromatography and fluorescence detection after derivatization with dansulfinic acid. J Sep Sci 2007; 31:71-7. [DOI: 10.1002/jssc.200700391] [Citation(s) in RCA: 45] [Impact Index Per Article: 2.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/11/2022]
|
26
|
Chu S, Metcalfe CD. Analysis of Acrylamide in Water Using a Coevaporation Preparative Step and Isotope Dilution Liquid Chromatography Tandem Mass Spectrometry. Anal Chem 2007; 79:5093-6. [PMID: 17539600 DOI: 10.1021/ac0623179] [Citation(s) in RCA: 22] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Acrylamide is a probable human carcinogen, and the drinking water quality guideline for this compound is 0.5 mg/L. However, analysis of this compound in water is difficult because of its very high water solubility, which limits the efficiency of sample preconcentration prior to analysis. We developed a robust and sensitive analytical method for the determination of trace quantities of acrylamide in samples of water using a novel preparative technique and isotope dilution liquid chromatography tandem mass spectrometry with atmospheric pressure chemical ionization as the ion source (LC-APCI-MS/MS). The preparative method involves coevaporation of acrylamide with water at pH 10 using a rotary evaporator, followed by acidification to pH 3.0 and concentration of the sample prior to analysis by LC-APCI-MS/MS. To compensate for the loss of the analyte during sample preparation and signal suppression due to interference from the sample matrix, isotope dilution with acrylamide-d3 was used for quantitation. Using this method, analyte recoveries ranged from 74 to 103% for acrylamide spiked into water at a concentration of 0.4 ng/mL. The limit of detection and limit of quantification (LOQ) for acrylamide in water were 0.02 and 0.06 ng/mL, respectively. This method was successfully applied to determine trace levels of acrylamide in samples of river water and in runoff from an agricultural field to which municipal biosolids (i.e., sludge) had been applied. Concentrations of acrylamide in these samples ranged from <LOQ to 0.16 microg/L.
Collapse
Affiliation(s)
- Shaogang Chu
- Worsfold Water Quality Center, Trent University, Peterborough, Ontario, K9J 7B8, Canada
| | | |
Collapse
|
27
|
Ferreira SLC, Bruns RE, da Silva EGP, Dos Santos WNL, Quintella CM, David JM, de Andrade JB, Breitkreitz MC, Jardim ICSF, Neto BB. Statistical designs and response surface techniques for the optimization of chromatographic systems. J Chromatogr A 2007; 1158:2-14. [PMID: 17416377 DOI: 10.1016/j.chroma.2007.03.051] [Citation(s) in RCA: 340] [Impact Index Per Article: 20.0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/02/2007] [Revised: 03/08/2007] [Accepted: 03/13/2007] [Indexed: 12/01/2022]
Abstract
This paper describes fundamentals and applications of multivariate statistical techniques for the optimization of chromatographic systems. The surface response methodologies: central composite design, Doehlert matrix and Box-Behnken design are discussed and applications of these techniques for optimization of sample preparation steps (extractions) and determination of experimental conditions for chromatographic separations are presented. The use of mixture design for optimization of mobile phases is also related. An optimization example involving a real separation process is exhaustively described. A discussion about model validation is presented. Some applications of other multivariate techniques for optimization of chromatographic methods are also summarized.
Collapse
Affiliation(s)
- Sergio Luis Costa Ferreira
- Universidade Federal da Bahia, Instituto de Química, Campus Universitário de Ondina, Salvador, Bahia 40170-290, Brazil.
| | | | | | | | | | | | | | | | | | | |
Collapse
|
28
|
Marín JM, Pozo OJ, Sancho JV, Pitarch E, López FJ, Hernández F. Study of different atmospheric-pressure interfaces for LC-MS/MS determination of acrylamide in water at sub-ppb levels. JOURNAL OF MASS SPECTROMETRY : JMS 2006; 41:1041-8. [PMID: 16832838 DOI: 10.1002/jms.1063] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
A rapid, sensitive and selective method based on LC-MS/MS has been developed for the direct determination of acrylamide residues in water in compliance with the current European Union (EU) 98/83 Drinking Water Directive. Given the high polarity of acrylamide, the application of a rapid on-line solid phase extraction step, commonly used for preconcentrating low analyte levels, was not found to be completely satisfactory. Therefore, an alternative approach based on the use of direct large-volume injection into the LC-MS/MS system has been used. Three atmospheric-pressure interfaces (ESI, APCI and Ion Sabre APCI) were checked to reach the required sensitivity (0.1 microg/l). All three interfaces were tested by analysis of six different water samples (surface water, groundwater, drinking water and three treated water samples) spiked at three concentration levels each (0.1, 1 and 10 microg/l). When using ESI, poor sensitivity and high matrix effects were observed. This situation improved when APCI was used as the interface because no matrix effect was found, although sensitivity was not completely satisfactory. The best results were obtained by interfacing the Ion Sabre APCI; its higher sensitivity for acrylamide (LOD 0.03 microg/l) and the absence of matrix effects recommended its selection. Using this approach, satisfactory recoveries (90-97%) and precision (<12%) were obtained for all water samples studied. Besides, the acquisition of two different MS/MS transitions allowed not only the quantification but also the confirmation of acrylamide in water at concentration levels around 0.1 microg/l.
Collapse
Affiliation(s)
- José M Marín
- Research Institute for Pesticides and Water, University Jaume I, Avda. Sos Baynat s/n E-12071 Castellón, Spain
| | | | | | | | | | | |
Collapse
|
29
|
Mori M, Tanaka K, Satori T, Ikedo M, Hu W, Itabashi H. Influence of acidic eluent for retention behaviors of common anions and cations by ion-exclusion/cation-exchange chromatography on a weakly acidic cation-exchange resin in the H+-form. J Chromatogr A 2006; 1118:51-5. [PMID: 16546200 DOI: 10.1016/j.chroma.2006.02.083] [Citation(s) in RCA: 25] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2005] [Revised: 02/25/2006] [Accepted: 02/27/2006] [Indexed: 11/21/2022]
Abstract
Influence of acidic eluent on retention behaviors of common anions and cations by ion-exclusion/cation-exchange chromatography (ion-exclusion/CEC) were investigated on a weakly acidic cation-exchange resin in the H(+)-form with conductivity. Sensitivities of analyte ions, especially weak acid anions (F(-) and HCOO(-)), were affected with degree of background conductivity level with pK(a1) (first dissociation constant) of acid in eluent. The retention behaviors of anions and cations were related to that of elution dip induced after eluting acid to separation column and injecting analyte sample. These results were largely dependent on the natures of acid as eluent. Through this study, succinic acid as the eluent was suitable for simultaneous separation of strong acid anions (SO(4)(2-), Cl(-), NO(3)(-) and I(-)), weak acid anions (F(-), HCOO(-) and CH(3)COO(-)), and cations (Na(+), K(+), NH(4)(+), Mg(2+) and Ca(2+)). The separation was achieved in 20 min under the optimum eluent condition, 20 mM succinic acid/2 mM 18-crown-6. Detection limits at S/N=3 ranged from 0.10 to 0.51 microM for strong acid anions, 0.20 to 5.04 microM for weak acid anions and 0.75 to 1.72 microM for cations. The relative standard deviations of peak areas in the repeated chromatographic runs (n=10) were in the range of 1.1-2.9% for anions and 1.8-4.5% for cations. This method was successfully applied to hot spring water containing strong acid anions, weak acid anions and cations, with satisfactory results.
Collapse
Affiliation(s)
- Masanobu Mori
- Faculty of Engineering, Gunma University, Kiryu, Gunma 376-8515, Japan.
| | | | | | | | | | | |
Collapse
|
30
|
Mori M, Ikedo M, Hu W, Helaleh MIH, Xu Q, Itabashi H, Tanaka K. High-speed ion-exclusion chromatography of dissolved carbon dioxide on a small weakly acidic cation-exchange resin column with ion-exchange enhancement columns of conductivity detection. J Chromatogr A 2005; 1092:250-3. [PMID: 16199234 DOI: 10.1016/j.chroma.2005.08.060] [Citation(s) in RCA: 9] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2004] [Revised: 08/16/2005] [Accepted: 08/18/2005] [Indexed: 10/25/2022]
Abstract
The high-speed ion-exclusion chromatographic determination of dissolved carbon dioxide, i.e., carbonic acid, hydrogencarbonate or carbonate, with conductivity detection was obtained using a small column packed with a weakly acidic cation-exchange resin in the H+-form (40 mm long x 4.6 mm i.d., 3 microm-particle and 0.1 meq./ml-capacity). Two different ion-exchange resin columns, which were a strongly acidic cation-exchange resin in the K+-form and a strongly basic anion-exchange resin in the OH- -form, were connected after the separation column. The sequence of columns could convert dissolved carbon dioxide to KOH having high conductivity response. The enhancement effect for dissolved carbon dioxide could retain even on the vast chromatographic runs, by using the enhancement columns with high ion-exchange capacity above 1.0 meq./ml. The retention time was in 60 s at flow-rate of 1.2 ml/min. The calibration graph of dissolved carbon dioxide estimated as H2CO3- was linear in the range of 0.005-10 mM. The detection limit at signal to noise of 3 was 0.15 microM as H2CO3-. This method was applicable to several rainwater and tap water samples.
Collapse
Affiliation(s)
- Masanobu Mori
- Faculty of Engineering, Gunma University, 1-5-1 Tenjin-cho, Kiryu, Gunma, Japan.
| | | | | | | | | | | | | |
Collapse
|
31
|
Zhang Y, Zhang G, Zhang Y. Occurrence and analytical methods of acrylamide in heat-treated foods. Review and recent developments. J Chromatogr A 2005; 1075:1-21. [PMID: 15974113 DOI: 10.1016/j.chroma.2005.03.123] [Citation(s) in RCA: 100] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
Abstract
In early 2002, Swedish National Food Administration (SNFA) and University of Stockholm together announced that certain foods that are processed or cooked at high temperature contain relatively high levels of acrylamide. The occurrence of acrylamide is derived from heat-induced reactions between the amino group of asparagine and the carbonyl group of reducing sugars during baking and frying. Corresponding chromatographic methods are used to determine various structural groups present during this process. Gas chromatography (GC)-mass spectrometry (MS) and liquid chromatography with tandem mass spectrometry (LC-MS/MS) analysis are both acknowledged as the major useful and authoritative methods for the acrylamide determination and other chromatographic methods are also briefly introduced. The aim of this review is to summarize the state-of-the-art about the occurrence, analytical methods, and extraction and clean-up procedures of acrylamide. Special attention is given to chromatographic techniques applied for the occurrence and determination of acrylamide.
Collapse
Affiliation(s)
- Yu Zhang
- Department of Food Science and Nutrition, College of Biosystems Engineering and Food Science, Zhejiang University, Hangzhou 310029, Zhejiang Province, China
| | | | | |
Collapse
|
32
|
Current literature in mass spectrometry. JOURNAL OF MASS SPECTROMETRY : JMS 2004; 39:1383-1394. [PMID: 15532071 PMCID: PMC7166839 DOI: 10.1002/jms.712] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/24/2023]
Abstract
In order to keep subscribers up‐to‐date with the latest developments in their field, John Wiley & Sons are providing a current awareness service in each issue of the journal. The bibliography contains newly published material in the field of mass spectrometry. Each bibliography is divided into 11 sections: 1 Books, Reviews & Symposia; 2 Instrumental Techniques & Methods; 3 Gas Phase Ion Chemistry; 4 Biology/Biochemistry: Amino Acids, Peptides & Proteins; Carbohydrates; Lipids; Nucleic Acids; 5 Pharmacology/Toxicology; 6 Natural Products; 7 Analysis of Organic Compounds; 8 Analysis of Inorganics/Organometallics; 9 Surface Analysis; 10 Environmental Analysis; 11 Elemental Analysis. Within each section, articles are listed in alphabetical order with respect to author (5 Weeks journals ‐ Search completed at 8th. Sept. 2004)
Collapse
|