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Lee J, Kim B, Sim HJ, Seo D, Kwak BM, Won J, Lee S, Baek SY, Han J. Development of a certified reference material for the analysis of vitamins in multivitamin tablets. J Anal Sci Technol 2023. [DOI: 10.1186/s40543-023-00368-3] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023] Open
Abstract
AbstractMultivitamin tablet certified reference material (CRM, 108-10-019) was developed for the analysis of seven water-soluble vitamins, including thiamine, riboflavin, nicotinamide, pantothenic acid, pyridoxine, biotin, and folic acid. The CRM was prepared in powder form by grinding multivitamin tablets and then mixing, sieving, and bottling the powder. For the certification of each water-soluble vitamin, the isotope dilution mass spectrometry based on the liquid chromatography was applied. The methods for each analyte were validated by confirming the repeatability and reproducibility and by comparing with other CRMs. The property values and uncertainties for the vitamins were determined with 10 units from sample stored at − 20 °C. The homogeneity of each certified component was also examined in the range of 0.48–2.2%. All certified values for the seven water-soluble vitamins were stable for 3 or 6 years after the initial certification under storage conditions at − 20 °C. For fat-soluble vitamins, including retinol, α-tocopherol, cholecalciferol, and phylloquinone, two expert laboratories participated in analyses based on official methods, and the mean values of the reported results were assigned as reference values. The multivitamin tablet CRM (108-10-019) will be useful for validating analytical methods and for ensuring the quality of results for vitamin analysis in multivitamin tablets or similar products.
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Lijalem YG, Gab-Allah MA, Choi K, Kim B. Development of isotope dilution-liquid chromatography/tandem mass spectrometry for the accurate determination of zearalenone and its metabolites in corn. Food Chem 2022; 384:132483. [PMID: 35202990 DOI: 10.1016/j.foodchem.2022.132483] [Citation(s) in RCA: 17] [Impact Index Per Article: 8.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/16/2021] [Revised: 01/12/2022] [Accepted: 02/14/2022] [Indexed: 12/26/2022]
Abstract
A method using isotope dilution-liquid chromatography-tandem mass spectrometry (ID-LC/MS/MS) was developed for the accurate determination of zearalenone (ZEN) and its five major metabolites in corn. 13C- or 2H-labeled analogues of the target mycotoxins were used as internal standards. As the immunoaffinity columns used demonstrated selectivity to a specific chiral isomer of a racemic mixture of zearalanone-d6, a clean-up cartridge without stereoselectivity (Mycosep 226 column) was selected for the same recovery of the analyte and its internal standard with adequate elimination of matrix interferences. The method demonstrated sufficient selectivity, sensitivity, accuracy and precision over a concentration range of 20-400 µg/kg. The limit of detections and limit of quantifications were 0.14-0.33 µg/kg and 0.45-1.11 µg/kg, respectively. The accuracy values were 96.7%-103.6%, with intra and inter-day precisions of less than 3% and 4%, respectively. The expanded measurement uncertainty was less than 7% (with a 95% confidence level).
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Affiliation(s)
- Yared Getachew Lijalem
- Organic Metrology Group, Division of Chemical and Biological Metrology, Korea Research Institute of Standards and Science, Daejeon 34113, South Korea; Department of Bio-Analytical Science, University of Science and Technology, Daejeon 34113, South Korea; National Metrology Institute of Ethiopia, Addis Ababa P. O. Box: 5722, Ethiopia
| | - Mohamed A Gab-Allah
- Organic Metrology Group, Division of Chemical and Biological Metrology, Korea Research Institute of Standards and Science, Daejeon 34113, South Korea; Department of Bio-Analytical Science, University of Science and Technology, Daejeon 34113, South Korea; Reference Materials Lab, National Institute of Standards, Tersa St, Haram, P. O. Box: 136, Giza 12211, Egypt
| | - Kihwan Choi
- Organic Metrology Group, Division of Chemical and Biological Metrology, Korea Research Institute of Standards and Science, Daejeon 34113, South Korea; Graduate School of Analytical Science and Technology, Chungnam National University, Daejeon 34134, South Korea.
| | - Byungjoo Kim
- Organic Metrology Group, Division of Chemical and Biological Metrology, Korea Research Institute of Standards and Science, Daejeon 34113, South Korea; Department of Bio-Analytical Science, University of Science and Technology, Daejeon 34113, South Korea.
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Kilvington A, Barnaba C, Rajasekaran S, Laurens Leimanis ML, Medina-Meza IG. Lipid profiling and dietary assessment of infant formulas reveal high intakes of major cholesterol oxidative product (7-ketocholesterol). Food Chem 2021; 354:129529. [PMID: 33761334 DOI: 10.1016/j.foodchem.2021.129529] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/24/2020] [Revised: 02/03/2021] [Accepted: 03/02/2021] [Indexed: 12/17/2022]
Abstract
Approximately two-thirds of US infants receive infant formula (IF) as a primary or sole nutritional source during the first six months of life. IF is available in a variety of commercial presentations; from a manufacturing standpoint, they can be categorized as powder- (PIF) or liquid- (LIF) based formulations. Thirty commercial IFs were analyzed in their oxidative and non-oxidative lipid profiles. We identified 7-ketocholesterol - a major end-product of cholesterol oxidation - as a potential biomarker of IF manufacturing. The statistical analysis allowed a re-classification of IF based on their metabolomic fingerprint, resulting in three groups assigned with low-to-high oxidative status. Finally, we modeled the dietary intake of cholesterol, sterols, and 7-ketocholesterol in the first year of life. The database provided in this study will be instrumental for scientists interested in infant nutrition, to establish bases for epidemiological studies aimed to find connections between nutrition and diet-associated diseases, such as sitosterolemia.
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Affiliation(s)
- Alice Kilvington
- Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, MI, USA.
| | - Carlo Barnaba
- Institute of Quantitative Health Science and Engineering, Michigan State University, East Lansing, MI, USA.
| | - Surender Rajasekaran
- Pediatric Intensive Care Unit, Helen DeVos Children's Hospital, 100 Michigan Street NE, Grand Rapids, MI, USA; Department of Pediatric and Human Development, College of Human Medicine, Michigan State University, East Lansing, MI, USA.
| | - Mara L Laurens Leimanis
- Pediatric Intensive Care Unit, Helen DeVos Children's Hospital, 100 Michigan Street NE, Grand Rapids, MI, USA; Department of Pediatric and Human Development, College of Human Medicine, Michigan State University, East Lansing, MI, USA.
| | - Ilce G Medina-Meza
- Department of Chemical Engineering and Materials Science, Michigan State University, East Lansing, MI, USA; Department of Biosystems and Agricultural Engineering, Michigan State University, East Lansing, MI, USA.
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Liu Z, Zhang P, Kästner L, Volmer DA. A simple MALDI target plate with channel design to improve detection sensitivity and reproducibility for quantitative analysis of biomolecules. JOURNAL OF MASS SPECTROMETRY : JMS 2019; 54:878-884. [PMID: 31652368 DOI: 10.1002/jms.4447] [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: 07/17/2019] [Revised: 09/13/2019] [Accepted: 09/21/2019] [Indexed: 06/10/2023]
Abstract
Overcoming the detrimental effects of sweet spots during crystallization is an important step to improve the quantitative abilities of matrix-assisted laser desorption/ionization (MALDI) mass spectrometry. In this study, we introduce MALDI targets, which exhibit a channel design to reduce sweet spot phenomena and improve reproducibility. The size of the channels was 3.0 mm in length, 0.35 mm in depth, and 0.40 mm in width, adjusted to the width of the implemented laser beam. For sample deposition, the matrix/sample mixture was homogenously deposited into the channels using capillary action. To demonstrate the proof-of-principle, the novel plates were used for the quantification of acetyl-L-carnitine in human blood plasma using a combined standard addition and isotope dilution method. The results showed that the reproducibility of acetyl-L-carnitine detection was highly improved over a conventional MALDI-MS assay, with RSD values of less than 5.9% in comparison with 15.6% using the regular MALDI method. The limits of quantification using the new plates were lowered approximately two-fold in comparison with a standard rastering approach on a smooth stainless-steel plate. Matrix effects were also assessed and shown to be negligible. The new assay was subsequently applied to the quantification of acetyl-L-carnitine in human plasma samples.
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Affiliation(s)
- Zhen Liu
- Institute of Bioanalytical Chemistry, Saarland University, Saarbrücken, Germany
| | - Peng Zhang
- School of Materials Science and Engineering, Sun Yat-sen University, Guanghzou, China
| | - Lars Kästner
- Department of Anatomy and Cell Biology, Saarland University, Homburg, Germany
| | - Dietrich A Volmer
- Department of Chemistry, Humboldt University of Berlin, Berlin, Germany
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Lee J, Kim B, Lee SY, Choi J, Kang D, Lee H, Choi K, Lee H, Sim HJ, Baek SY, Lee H, Hyung SW, Ahn S, Seo D, Hwang J, Park JS, Kwak BM, Won J. Development of an infant formula certified reference material for the analysis of organic nutrients. Food Chem 2019; 298:125088. [PMID: 31260987 DOI: 10.1016/j.foodchem.2019.125088] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2019] [Revised: 06/25/2019] [Accepted: 06/26/2019] [Indexed: 12/18/2022]
Abstract
Infant formula certified reference material (CRM, KRISS CRM 108-02-003) were developed for the analysis of organic nutrients. The CRM is a milk-based infant formula powder, packaged at 14 g per unit. Ten thousand units were prepared and stored at -70 °C. For the certification of each nutrient, ten units were analyzed for simultaneous value-assignment and homogeneity test. Analytical methods used were isotope dilution mass spectrometry (IDMS) based on liquid chromatography mass spectrometer (LC/MS) or gas chromatography mass spectrometer (GC/MS) as higher-order reference methods.13 vitamins, 3 fatty acids, and total cholesterol were certified. The between-unit relative standard deviation of measurement results for each nutrient ranged 0.2% to 2.5%, showing very good homogeneity. The expanded relative uncertainties of the certified values ranged from 1% to 8%, indicating that they have higher-order metrological quality. The values of proximates (proteins, lipids, carbohydrates, water, and ash) were assigned through inter-laboratory comparisons.
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Affiliation(s)
- Joonhee Lee
- Division of Chemical and Medical Metrology, Korea Research Institute of Standards and Science, Yuseong, Daejeon 34113, Republic of Korea
| | - Byungjoo Kim
- Division of Chemical and Medical Metrology, Korea Research Institute of Standards and Science, Yuseong, Daejeon 34113, Republic of Korea.
| | - Sun Young Lee
- Division of Chemical and Medical Metrology, Korea Research Institute of Standards and Science, Yuseong, Daejeon 34113, Republic of Korea
| | - Jongoh Choi
- Division of Chemical and Medical Metrology, Korea Research Institute of Standards and Science, Yuseong, Daejeon 34113, Republic of Korea
| | - Dukjin Kang
- Division of Chemical and Medical Metrology, Korea Research Institute of Standards and Science, Yuseong, Daejeon 34113, Republic of Korea
| | - Hwasim Lee
- Division of Chemical and Medical Metrology, Korea Research Institute of Standards and Science, Yuseong, Daejeon 34113, Republic of Korea
| | - KiHwan Choi
- Division of Chemical and Medical Metrology, Korea Research Institute of Standards and Science, Yuseong, Daejeon 34113, Republic of Korea
| | - Hyeyoung Lee
- Division of Chemical and Medical Metrology, Korea Research Institute of Standards and Science, Yuseong, Daejeon 34113, Republic of Korea
| | - Hee-Jung Sim
- Division of Chemical and Medical Metrology, Korea Research Institute of Standards and Science, Yuseong, Daejeon 34113, Republic of Korea
| | - Song-Yee Baek
- Division of Chemical and Medical Metrology, Korea Research Institute of Standards and Science, Yuseong, Daejeon 34113, Republic of Korea
| | - Honghee Lee
- Division of Chemical and Medical Metrology, Korea Research Institute of Standards and Science, Yuseong, Daejeon 34113, Republic of Korea
| | - Seok-Won Hyung
- Division of Chemical and Medical Metrology, Korea Research Institute of Standards and Science, Yuseong, Daejeon 34113, Republic of Korea
| | - Seonghee Ahn
- Division of Chemical and Medical Metrology, Korea Research Institute of Standards and Science, Yuseong, Daejeon 34113, Republic of Korea
| | - Dongwon Seo
- Food Analysis Center, Korea Food Research Institute, Wanju-Gun, Jeollabuk-do 55365, Republic of Korea
| | - Jinbong Hwang
- Food Analysis Center, Korea Food Research Institute, Wanju-Gun, Jeollabuk-do 55365, Republic of Korea
| | - Jong-Su Park
- Food Safety Center, Namyang Dairy Products Company, Sejong 30055, Republic of Korea
| | - Byung-Man Kwak
- Food Safety Center, Namyang Dairy Products Company, Sejong 30055, Republic of Korea
| | - Jongeun Won
- Food Safety Center, Namyang Dairy Products Company, Sejong 30055, Republic of Korea
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Evolution of reference materials for the determination of organic nutrients in food and dietary supplements-a critical review. Anal Bioanal Chem 2018; 411:97-127. [PMID: 30506091 DOI: 10.1007/s00216-018-1473-0] [Citation(s) in RCA: 20] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/03/2018] [Revised: 10/30/2018] [Accepted: 11/05/2018] [Indexed: 10/27/2022]
Abstract
For over 40 years, food-matrix certified reference materials (CRMs) have been available for determination of trace element content, and a wide variety of materials are available from most producers of CRMs. However, the availability of food-matrix CRMs for organic nutrients has been more limited. The European Commission (EC) Bureau Communautaire de Référence (BCR) and the National Institute of Standards and Technology (NIST) introduced food-matrix CRMs with values assigned for vitamins and other organic nutrients such as fatty acids and carotenoids in the 1990s. The number of organic nutrients for which values were assigned has increased significantly in the past decade, and the approach and analytical methods used for assignment of the certified values have also evolved. Recently, dietary supplement-matrix CRMs such as multivitamin tablets with values assigned for vitamins and carotenoids, and fish and plant oils with values assigned for fatty acids have appeared. The development, evolution, and improvement of food- and dietary supplement-matrix CRMs for determination of vitamins, carotenoids, and fatty acids are described, with emphasis on CRMs made available in the past 10 years. Recent food and dietary supplement CRMs for the determination of organic nutrients include infant formula, multivitamin tablets, milk and egg powders, breakfast cereal, meat homogenate, blueberries, soy flour, fish and plant oils, dry cat food, and protein drink powder. Many of these food- and supplement-matrix CRMs have values assigned for over 80 organic and inorganic nutrients, toxic elements, proximates, and contaminants. The review provides a critical assessment of the challenges and evolving improvements in the production and the analytical methods used for value assignment of these CRMs. The current status and future needs for additional food- and dietary supplement-matrix CRMs for organic nutrients are also discussed. Graphical abstract Food Composition Triangle with currently-available food-matrix certified reference materials (CRMs) for the determination of organic nutrients positioned according to fat, protein, and carbohydrate composition.
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Simultaneous determination of 21 trace perfluoroalkyl substances in fish by isotope dilution ultrahigh performance liquid chromatography tandem mass spectrometry. J Chromatogr B Analyt Technol Biomed Life Sci 2018; 1084:45-52. [PMID: 29567443 DOI: 10.1016/j.jchromb.2018.03.008] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/21/2017] [Revised: 02/22/2018] [Accepted: 03/06/2018] [Indexed: 12/29/2022]
Abstract
Perfluoroalkyl substances (PFASs) have been identified as emerging environmental contaminants. In this study, an efficient and accurate ultrahigh performance liquid chromatography tandem mass spectrometry (UHPLC-MS/MS) method was developed for simultaneous determination of 21 PFASs in fish. Acetonitrile was used for sample extraction. Solid phase extraction (SPE) by WAX cartridges and then freezing at -30 °C were adopted as cleanup strategies. Strict measurements were performed to control background contamination during the whole procedure. Matrix effects were evaluated by external standard and isotope dilution mass spectrometry (IDMS) methods. IDMS can compensate the matrix effects to a large extent. The method detection limits (MDLs) ranged from 2 pg/g to 10 pg/g except for PFBA (120 pg/g). The method quantitation limits (MQLs) ranged from 5 pg/g to 30 pg/g except for PFBA (300 pg/g). The matrix spiked recoveries of three spiked levels were in the range of 79.6%-109%. The intra-day relative standard deviation (RSD) and inter-day RSD were from 0.94% to 13.9% and 0.36% to 11.2% respectively. Two fish tissue reference materials were analyzed by the developed method. The results of reference materials were within the uncertainty of the given value. The quantitative results of IDMS and standard addition (SA) - IDMS were comparable. The developed UHPLC-MS/MS method was applied for PFASs detection in 20 marine fish samples. 9 PFASs were detected in the samples with the ∑9PFASs concentration range of 0.04 to 2.14 ng/g wet weight (ww).
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Abstract
Our body contains a wide variety of fatty acids that differ in chain length, the degree of unsaturation, and location of the double bonds. As the various fatty acids play distinct roles in health and disease, methods that can specifically determine the fatty acid profile are needed for fundamental and clinical studies. Here we describe a method for the separation and quantification of fatty acids ranging from 8 to 24 carbon chain lengths in blood samples using gas chromatography-mass spectrometry following derivatization using pentafluorobenzyl bromide. This method quantitatively monitors fatty acid composition in a manner that satisfies the requirements for comprehensiveness, sensitivity, and accuracy.
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Ahn S, Kim B, Baek SY, Aristiawan Y, Kim J, Kim B. Exact Matrix-matching Calibration by Standard Addition-Isotope Dilution-Liquid Chromatography/Mass Spectrometry for the Accurate Determination of Chloramphenicol in Infant Formula. B KOREAN CHEM SOC 2017. [DOI: 10.1002/bkcs.11200] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/06/2022]
Affiliation(s)
- Seonghee Ahn
- Division of Metrology for Quality of Life; Korea Research Institute of Standards and Science; Daejeon 34113 Korea
| | - Bomi Kim
- Division of Metrology for Quality of Life; Korea Research Institute of Standards and Science; Daejeon 34113 Korea
- Department of Chemistry; Chungnam National University; Daejeon 34134 Korea
| | - Song-Yee Baek
- Division of Metrology for Quality of Life; Korea Research Institute of Standards and Science; Daejeon 34113 Korea
| | - Yosi Aristiawan
- Division of Metrology for Quality of Life; Korea Research Institute of Standards and Science; Daejeon 34113 Korea
- Department of Bio-Analytical Science; University of Science and Technology; Daejeon 34113 Korea
| | - Jeongkwon Kim
- Department of Chemistry; Chungnam National University; Daejeon 34134 Korea
| | - Byungjoo Kim
- Division of Metrology for Quality of Life; Korea Research Institute of Standards and Science; Daejeon 34113 Korea
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Li XQ, Zhang QH, Yang Z, Li HM, Huang DF. The effects of isotope-labeled analogs on the LC-IDMS measurement by comparison of ESI responses and matrix effect of melamine, 13C3-melamine, 13C3+15N3-melamine, and 15N3-melamine. Anal Bioanal Chem 2017; 409:3233-3243. [DOI: 10.1007/s00216-017-0263-4] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/23/2016] [Revised: 02/06/2017] [Accepted: 02/16/2017] [Indexed: 10/20/2022]
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Development of isotope dilution-liquid chromatography/tandem mass spectrometry for the accurate determination of trans- and cis-vitamin K 1 isomers in infant formula. Food Chem 2016; 221:729-736. [PMID: 27979265 DOI: 10.1016/j.foodchem.2016.11.112] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/03/2016] [Revised: 11/07/2016] [Accepted: 11/21/2016] [Indexed: 11/22/2022]
Abstract
A method based on isotope dilution-liquid chromatography/tandem mass spectrometry (ID-LC/MS/MS) using a C30 column has been developed for the separate and accurate determination of trans- and cis-vitamin K1 in infant formula. Vitamin K1 and the deuterium-labeled internal standard eluted at slightly different retention times experiencing different matrix effects, and this possibly resulted in biased measurement. The matrix effect profiles obtained from post-column infusion experiments showed that atmospheric pressure chemical ionization (APCI) was less susceptible to matrix effects near the retention time than electrospray ionization (ESI); therefore, APCI was used in this study. The developed method was validated by measuring fortified samples, and the results agreed with the gravimetric values. Its repeatability and reproducibly were within 2% relative standard deviation. The relative expanded uncertainty was approximately 5%, indicating that the method was of higher-order metrological quality as a reference method.
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Lee J, Song YS, Sim HJ, Kim B. Isotope dilution-liquid chromatography/mass spectrometric method for the determination of riboflavin content in multivitamin tablets and infant formula. J Food Compost Anal 2016. [DOI: 10.1016/j.jfca.2016.05.008] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/24/2022]
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GC-MS and LC-MS approaches for determination of tocopherols and tocotrienols in biological and food matrices. J Pharm Biomed Anal 2016; 127:156-69. [PMID: 26964480 DOI: 10.1016/j.jpba.2016.02.051] [Citation(s) in RCA: 33] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/02/2015] [Revised: 02/17/2016] [Accepted: 02/28/2016] [Indexed: 11/20/2022]
Abstract
Tocopherols and tocotrienols, widely described as vitamin E derivatives, have been proven to take part in a number of important biological functions. Among them, antioxidant properties had been investigated and documented in the literature. Since tocochromanols have revealed their plausible beneficial impact on several pathological processes, such as cancerogenesis or cognitive impairment diseases, there is a growing interest in quantitative determination of these compounds in biological fluids, tissues and plant organs. However, due to vitamin E chemical features, such as lipophilic and non-polar characteristics, quantitative determination of the compounds seems to be problematic. In this paper we present current analytical approaches in tocopherols and tocotrienols determination in biological and food matrices with the use of chromatographic techniques, especially gas chromatography (GC) and high performance liquid chromatography (HPLC) coupled with mass spectrometry. Derivatization techniques applied for GC-MS analysis in the case of tocol derivatives, especially silylation and acylation, are described. Significant attention is paid to ionization process of tocopherols and tocotrienols.
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Aminot Y, Litrico X, Chambolle M, Arnaud C, Pardon P, Budzindki H. Development and application of a multi-residue method for the determination of 53 pharmaceuticals in water, sediment, and suspended solids using liquid chromatography-tandem mass spectrometry. Anal Bioanal Chem 2015. [DOI: 10.1007/s00216-015-9017-3 10.1007/s00216-015-9017-3] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/14/2023]
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Development and application of a multi-residue method for the determination of 53 pharmaceuticals in water, sediment, and suspended solids using liquid chromatography-tandem mass spectrometry. Anal Bioanal Chem 2015; 407:8585-604. [DOI: 10.1007/s00216-015-9017-3] [Citation(s) in RCA: 37] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2015] [Revised: 07/04/2015] [Accepted: 08/28/2015] [Indexed: 01/07/2023]
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Analysis of biologically-active, endogenous carboxylic acids based on chromatography-mass spectrometry. Trends Analyt Chem 2014. [DOI: 10.1016/j.trac.2014.05.008] [Citation(s) in RCA: 33] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/10/2023]
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