1
|
Hahm G, Redeker FA, Jorabchi K. Multielement Detection of Nonmetals by Barium-Based Post-ICP Chemical Ionization Coupled to Orbitrap-MS. J Am Soc Mass Spectrom 2024; 35:871-882. [PMID: 38650348 PMCID: PMC11066957 DOI: 10.1021/jasms.3c00424] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/08/2023] [Revised: 04/11/2024] [Accepted: 04/16/2024] [Indexed: 04/25/2024]
Abstract
Prevalence of F, Cl, S, P, Br, and I in pharmaceuticals and environmental contaminants has promoted standard-free quantitation using analyte-independent heteroatom responses in inductively coupled plasma (ICP)-MS. However, in-plasma ionization challenges and element-dependent isobaric interference removal methods have hampered the multielement nonmetal detection in ICP-MS. Here, we examine an alternative approach to enhance multielement detection capabilities. Analytes are introduced into an ICP leading to post-plasma formation of HF, HCl, H3PO3, H2SO4, HBr, and HI, which are then chemically ionized to BaF+, BaCl+, BaH2PO3+, BaHSO4+, BaBr+, and BaI+ via reactions with barium-containing ions supplied by a nanospray. Subsequent ion detection by high-resolution MS provides an element-independent approach for resolving isobaric interferences. We show that elemental response factors using these ions are linear within 2 orders of magnitude and independent of analytes' chemical structures. Using a single set of operating parameters, detection limits <1 ng/mL are obtained for Cl, Br, I, and P, while those for F and S are 1.8 and 6.2 ng/mL, respectively, offering improved multielement quantitation of nonmetals. Further, insights into ionization mechanisms indicate that the reactivities of reagent ions follow the order BaNO2+ > BaHCO2+ > Ba(H2O)n2+ ∼ BaCH3CO2+. Notably, the least reactive ions are generated directly by nanospray, suggesting that modification of these ions via interaction with plasma afterglow is critical for achieving good sensitivities. Moreover, our experiments indicate that the element-specific plasma products follow the order HF < H2SO4 ∼ HCl < H3PO3 ∼ HBr ∼ HI for their propensity to react with reagent ions. These insights provide guidelines to manage matrix effects and offer pathways to further improve the technique.
Collapse
Affiliation(s)
- Grace Hahm
- Department of Chemistry, Georgetown
University, Washington, D.C. 20057, United States
| | - Frenio A. Redeker
- Department of Chemistry, Georgetown
University, Washington, D.C. 20057, United States
| | - Kaveh Jorabchi
- Department of Chemistry, Georgetown
University, Washington, D.C. 20057, United States
| |
Collapse
|
2
|
Wise SA, Hahm G, Burdette CQ, Tai SSC, Camara JE, Sempos CT, Williams EL. Determination of 24,25-Dihydroxyvitamin D 3 [24,25(OH) 2D 3] in Archived Vitamin D External Quality Assessment Scheme (DEQAS) Samples using a Reference Measurement Procedure with Comparison to DEQAS Participant Results and Assessment of Contribution of 24,25(OH) 2D 3 to DEQAS Assay Results. J Steroid Biochem Mol Biol 2023; 231:106318. [PMID: 37169270 DOI: 10.1016/j.jsbmb.2023.106318] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 01/20/2023] [Revised: 04/19/2023] [Accepted: 05/03/2023] [Indexed: 05/13/2023]
Abstract
Ninety archived human serum samples from the Vitamin D External Quality Assessment Scheme (DEQAS) were analyzed using a reference measurement procedure (RMP) based on isotope dilution liquid chromatography - tandem mass spectrometry (ID LC-MS/MS) for the determination of 24,25-dihydroxyvitamin D3 [24,25(OH)2D3]. These 24,25(OH)2D3 results, in conjunction with concentration values assigned using RMPs for 25-hydroxyvitamin D2 [25(OH)D2] and 25-hydroxyvitamin D3 [25(OH)D3], provide a valuable resource for assessing the accuracy of measurements for 24,25(OH)2D3 and for investigating the relationship between 24,25(OH)2D3 and 25(OH)D3. Results for 24,25(OH)2D3 using the RMP were compared to DEQAS consensus values demonstrating that the consensus values were not sufficient to assess the accuracy of measurements among different laboratories and methods. A multivariable regression analysis approach using historical DEQAS consensus values for various total 25(OH)D assays was used to assess the contribution of 24,25(OH)2D3 concentration on the assay response. The response of several ligand binding assays for total 25(OH)D was shown to be impacted by the presence of 24,25(OH)2D3.
Collapse
Affiliation(s)
- Stephen A Wise
- Office of Dietary Supplements, National Institutes of Health, Bethesda, MD 20892, USA
| | - Grace Hahm
- National Institute of Standards and Technology (NIST), Gaithersburg, MD 20899, USA
| | - Carolyn Q Burdette
- National Institute of Standards and Technology (NIST), Gaithersburg, MD 20899, USA
| | - Susan S-C Tai
- National Institute of Standards and Technology (NIST), Gaithersburg, MD 20899, USA
| | - Johanna E Camara
- National Institute of Standards and Technology (NIST), Gaithersburg, MD 20899, USA
| | | | | |
Collapse
|
3
|
Redeker FA, Lesniewski JE, Hahm G, McMahon WP, Jorabchi K. High-Resolution Elemental Mass Spectrometry Using LC-ICP-Nanospray-Orbitrap for Simultaneous and Species-Independent Quantitation of Fluorinated and Chlorinated Compounds. Anal Chem 2022; 94:11865-11872. [PMID: 35977413 PMCID: PMC9427716 DOI: 10.1021/acs.analchem.2c02359] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
Simultaneous elemental detection of F and Cl offers quantitation of fluorinated and chlorinated compounds and their transformation products without compound-specific standards. Despite wide-ranging applications, this capability has been hindered by fundamental and technical shortcomings of current inductively coupled plasma (ICP)-MS methods in ion formation and isobaric interference elimination. These hurdles are alleviated here via a chemical ionization method. Fluorine and chlorine in analytes are first converted to HF and HCl by an ICP with post-plasma recombination and subsequently react with barium-containing ions supplied by a nanospray, yielding BaF+ and BaCl+ as elemental reporter ions. Notably, the method is readily interfaced to an Orbitrap MS which eliminates isobaric interferences at resolving powers as low as 35,000, far greater than that of current ICP-MS instruments. Moreover, the instrument is easily reverted to the ESI-MS mode for complementary molecular characterization. To demonstrate analytical capabilities, a workflow for rapid quantitation of compounds separated by reversed-phase liquid chromatography is developed using a species-independent calibration. The independent F and Cl measurements agree with each other, providing recoveries of >90% and LODs of 8-12 pmol Cl and 5-12 pmol F on the column. The workflow along with LC-ESI-MS on the same instrument is then applied to identify and quantify in-vitro drug metabolites, yielding total drug-related material recoveries of >80% and quantitation of minor metabolites summing to 8% of the total drug-related compounds. These results highlight the strengths of simultaneous F and Cl speciation for rapid quantitation with applications in early drug development.
Collapse
Affiliation(s)
- Frenio A. Redeker
- Department of Chemistry, Georgetown University, Washington, DC 20057
| | | | - Grace Hahm
- Department of Chemistry, Georgetown University, Washington, DC 20057
| | | | - Kaveh Jorabchi
- Department of Chemistry, Georgetown University, Washington, DC 20057
| |
Collapse
|
4
|
Sempos CT, Williams EL, Carter GD, Jones J, Camara JE, Burdette CQ, Hahm G, Nalin F, Duewer DL, Kuszak AJ, Merkel J, Hoofnagle AN, Lukas P, Cavalier É, Durazo-Arvizu RA, Crump PM, Popp C, Beckert C, Schultess J, Van Slooten G, Tourneur C, Pease C, Kaul R, Villarreal A, Ivison F, Fischer R, van den Ouweland JMW, Ho CS, Law EWK, Simard JN, Gonthier R, Holmquist B, Batista MC, Meadows S, Cox L, Jansen E, Khan DA, Robyak K, Creer MH, Kilbane M, Twomey PJ, Freeman J, Parker N, Yuan J, Fitzgerald R, Mushtaq S, Clarke MW, Breen N, Simpson C, Wise SA. Assessment of serum total 25-hydroxyvitamin D assays for Vitamin D External Quality Assessment Scheme (DEQAS) materials distributed at ambient and frozen conditions. Anal Bioanal Chem 2021; 414:1015-1028. [PMID: 34750644 DOI: 10.1007/s00216-021-03742-5] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2021] [Revised: 10/12/2021] [Accepted: 10/18/2021] [Indexed: 10/19/2022]
Abstract
The Vitamin D External Quality Assessment Scheme (DEQAS) distributes human serum samples four times per year to over 1000 participants worldwide for the determination of total serum 25-hydroxyvitamin D [25(OH)D)]. These samples are stored at -40 °C prior to distribution and the participants are instructed to store the samples frozen at -20 °C or lower after receipt; however, the samples are shipped to participants at ambient conditions (i.e., no temperature control). To address the question of whether shipment at ambient conditions is sufficient for reliable performance of various 25(OH)D assays, the equivalence of DEQAS human serum samples shipped under frozen and ambient conditions was assessed. As part of a Vitamin D Standardization Program (VDSP) commutability study, two sets of the same nine DEQAS samples were shipped to participants at ambient temperature and frozen on dry ice. Twenty-eight laboratories participated in this study and provided 34 sets of results for the measurement of 25(OH)D using 20 ligand binding assays and 14 liquid chromatography-tandem mass spectrometry (LC-MS/MS) methods. Equivalence of the assay response for the frozen versus ambient DEQAS samples for each assay was evaluated using multi-level modeling, paired t-tests including a false discovery rate (FDR) approach, and ordinary least squares linear regression analysis of frozen versus ambient results. Using the paired t-test and confirmed by FDR testing, differences in the results for the ambient and frozen samples were found to be statistically significant at p < 0.05 for four assays (DiaSorin, DIAsource, Siemens, and SNIBE prototype). For all 14 LC-MS/MS assays, the differences in the results for the ambient- and frozen-shipped samples were not found to be significant at p < 0.05 indicating that these analytes were stable during shipment at ambient conditions. Even though assay results have been shown to vary considerably among different 25(OH)D assays in other studies, the results of this study also indicate that sample handling/transport conditions may influence 25(OH)D assay response for several assays.
Collapse
Affiliation(s)
- Christopher T Sempos
- Office of Dietary Supplements (ODS), National Institutes of Health (NIH), Bethesda, MD, 20892, USA.,Vitamin D Standardization Program LLC, Havre de Grace, MD, 21078, USA
| | | | | | - Julia Jones
- Imperial Healthcare NHS Trust, London, W6 8RF, UK
| | - Johanna E Camara
- Chemical Sciences Division, National Institute of Standards and Technology (NIST), Gaithersburg, MD, 20899, USA
| | - Carolyn Q Burdette
- Chemical Sciences Division, National Institute of Standards and Technology (NIST), Gaithersburg, MD, 20899, USA
| | - Grace Hahm
- Chemical Sciences Division, National Institute of Standards and Technology (NIST), Gaithersburg, MD, 20899, USA
| | - Federica Nalin
- Chemical Sciences Division, National Institute of Standards and Technology (NIST), Gaithersburg, MD, 20899, USA
| | - David L Duewer
- Chemical Sciences Division, National Institute of Standards and Technology (NIST), Gaithersburg, MD, 20899, USA
| | - Adam J Kuszak
- Office of Dietary Supplements (ODS), National Institutes of Health (NIH), Bethesda, MD, 20892, USA
| | - Joyce Merkel
- Office of Dietary Supplements (ODS), National Institutes of Health (NIH), Bethesda, MD, 20892, USA
| | - Andrew N Hoofnagle
- Department of Laboratory Medicine and Pathology, University of Washington, Seattle, WA, 98185, USA
| | - Pierre Lukas
- Clinical Chemistry, University of Liège, CHU de Liège, 4000, Liège, Belgium
| | - Étienne Cavalier
- Clinical Chemistry, University of Liège, CHU de Liège, 4000, Liège, Belgium
| | - Ramón A Durazo-Arvizu
- Biostatistics Core, The Sabin Research Institute, Keck School of Medicine, University of Southern California, Los Angeles, CA, 90027, USA
| | - Peter M Crump
- Computing and Biometry, University of Wisconsin-Madison, Madison, WI, 53706, USA
| | - Christian Popp
- Abbott Laboratories, ADD Wiesbaden Abbott GmbH, 65205, Wiesbaden, Germany
| | - Christian Beckert
- Abbott Laboratories, ADD Wiesbaden Abbott GmbH, 65205, Wiesbaden, Germany
| | - Jan Schultess
- Abbott Laboratories, ADD Wiesbaden Abbott GmbH, 65205, Wiesbaden, Germany
| | | | | | | | - Ravi Kaul
- Bio-Rad Laboratories, Clinical Diagnostics, Hercules, CA, 94547, USA
| | | | - Fiona Ivison
- Central Manchester Foundation Trust, Manchester, M13 9WL, UK
| | - Ralf Fischer
- Chromsystems Instruments & Chemicals GmbH, 82166, Gräfelfing, Germany
| | | | - Chung S Ho
- Biochemical Mass Spectrometry Unit, Department of Chemical Pathology, Prince of Wales Hospital, The Chinese University of Hong Kong, Shatin, Hong Kong, 999077
| | - Emmett W K Law
- Biochemical Mass Spectrometry Unit, Department of Chemical Pathology, Prince of Wales Hospital, The Chinese University of Hong Kong, Shatin, Hong Kong, 999077
| | | | | | - Brett Holmquist
- Endocrine Sciences, LabCorp Specialty Testing Group, Agoura Hills, CA, 91301, USA
| | | | - Sarah Meadows
- Medical Research Council (MRC) Elsie Widdowson Laboratory (Closed Dec. 2018), Cambridge, CB2 0SL, UK.,NIHR BRC Nutritional Biomarker Laboratory, MRC Epidemiology Unit, University of Cambridge, Cambridge, CB2 0SL, UK
| | - Lorna Cox
- Medical Research Council (MRC) Elsie Widdowson Laboratory (Closed Dec. 2018), Cambridge, CB2 0SL, UK.,NIHR BRC Nutritional Biomarker Laboratory, MRC Epidemiology Unit, University of Cambridge, Cambridge, CB2 0SL, UK
| | - Eugene Jansen
- National Institute of Public Health and the Environment (RIVM), 3720 BA, Bilthoven, The Netherlands
| | - Dilshad Ahmed Khan
- National University of Medical Sciences (NUMS), Rawalpindi, 46000, Punjab, Pakistan
| | - Kimberly Robyak
- College of Medicine, Penn State University, Hershey, PA, 17033, USA
| | - Michael H Creer
- College of Medicine, Penn State University, Hershey, PA, 17033, USA
| | - Mark Kilbane
- Clinical Chemistry, St. Vincent's University Hospital, Elm Park, Dublin 4, D04 T6F4, Ireland
| | - Patrick J Twomey
- Clinical Chemistry, St. Vincent's University Hospital, Elm Park, Dublin 4, D04 T6F4, Ireland
| | | | - Neil Parker
- Siemens-Healthineers, Tarrytown, NY, 10591, USA
| | - Jinyun Yuan
- SNIBE, Shenzhen, 518122, People's Republic of China
| | - Robert Fitzgerald
- Health Clinical Laboratories, University of California at San Diego, La Jolla, CA, 92093, USA
| | | | - Michael W Clarke
- Metabolomics Australia, Centre for Microscopy, Characterisation and Analysis, The University of Western Australia, Perth, WA, 6009, Australia
| | - Norma Breen
- Waters Technologies Ireland Ltd., Wexford, Y35 D431, Ireland
| | | | - Stephen A Wise
- Office of Dietary Supplements (ODS), National Institutes of Health (NIH), Bethesda, MD, 20892, USA. .,Scientist Emeritus, National Institute of Standards and Technology (NIST), Gaithersburg, MD, 20899, USA.
| |
Collapse
|
5
|
Wise SA, Camara JE, Sempos CT, Lukas P, Le Goff C, Peeters S, Burdette CQ, Nalin F, Hahm G, Durazo-Arvizu RA, Kuszak AJ, Merkel J, Cavalier É. Vitamin D Standardization Program (VDSP) intralaboratory study for the assessment of 25-hydroxyvitamin D assay variability and bias. J Steroid Biochem Mol Biol 2021; 212:105917. [PMID: 34010687 PMCID: PMC8403635 DOI: 10.1016/j.jsbmb.2021.105917] [Citation(s) in RCA: 15] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/26/2021] [Revised: 04/07/2021] [Accepted: 05/04/2021] [Indexed: 12/20/2022]
Abstract
An intralaboratory study assessing assay variability and bias for determination of serum total 25-hydroxyvitamin D [25(OH)D] was conducted by the Vitamin D Standardization Program (VDSP). Thirteen assays for serum total 25(OH)D were evaluated in a single laboratory including 11 unique immunoassays and one liquid chromatography - tandem mass spectrometry (LC-MS/MS) assay. Fifty single-donor serum samples, including eight samples with high concentrations of 25(OH)D2 (> 30 nmol/L), were assigned target values for 25(OH)D2 and 25(OH)D3 using reference measurement procedures (RMP). Using four replicate measurements for each sample, the mean total percent coefficient of variation (%CV) and mean % bias from the target values were determined for each assay using the 50 single-donor samples and a 42-sample subset, which excluded 8 high 25(OH)D2 concentration samples, and compared with VDSP performance criteria of ≤ 10 % CV and ≤ ±5 % mean bias. All 12 assays achieved the performance criterion for % CV, and 9 of the 12 assays were within ≤ ±5 % mean bias. The Fujirebio Inc. assay exhibited the lowest %CV and highest percentage of individual measurements within ≤ ±5 % mean bias. Ten immunoassays exhibited changes in response due to the high 25(OH)D2 samples with Abbott, Biomérieux, DiaSorin, DIAsource, and IDS-iSYS assays having the largest deviations. The Fujirebio Inc. and Beckman Coulter assays were only minimally affected by the presence of the high 25(OH)D2 samples. Samples with high concentrations of 25(OH)D2 provided a critical performance test for immunoassays indicating that some assays may not have equal response or recovery for 25(OH)D2 and 25(OH)D3.
Collapse
Affiliation(s)
- Stephen A Wise
- Office of Dietary Supplements (ODS), National Institutes of Health (NIH), Bethesda, MD 20892, USA; Scientist Emeritus, Associate, National Institute of Standards and Technology (NIST), Gaithersburg, MD 20899, USA.
| | - Johanna E Camara
- Chemical Sciences Division, National Institute of Standards and Technology (NIST), Gaithersburg, MD 20899, USA
| | - Christopher T Sempos
- Office of Dietary Supplements (ODS), National Institutes of Health (NIH), Bethesda, MD 20892, USA; Vitamin D Standardization Program LLC, Havre de Grace, MD 21078 USA
| | - Pierre Lukas
- Clinical Chemistry, University of Liège, CHU de Liège, B-4000 Liège, Belgium
| | - Caroline Le Goff
- Clinical Chemistry, University of Liège, CHU de Liège, B-4000 Liège, Belgium
| | - Stephanie Peeters
- Clinical Chemistry, University of Liège, CHU de Liège, B-4000 Liège, Belgium
| | - Carolyn Q Burdette
- Chemical Sciences Division, National Institute of Standards and Technology (NIST), Gaithersburg, MD 20899, USA
| | - Federica Nalin
- Chemical Sciences Division, National Institute of Standards and Technology (NIST), Gaithersburg, MD 20899, USA
| | - Grace Hahm
- Chemical Sciences Division, National Institute of Standards and Technology (NIST), Gaithersburg, MD 20899, USA
| | - Ramón A Durazo-Arvizu
- Biostatistics Core, The Sabin Research Institute, Keck School of Medicine, University of Southern California, Los Angeles, CA 90027, USA
| | - Adam J Kuszak
- Office of Dietary Supplements (ODS), National Institutes of Health (NIH), Bethesda, MD 20892, USA
| | - Joyce Merkel
- Office of Dietary Supplements (ODS), National Institutes of Health (NIH), Bethesda, MD 20892, USA
| | - Étienne Cavalier
- Clinical Chemistry, University of Liège, CHU de Liège, B-4000 Liège, Belgium
| |
Collapse
|
6
|
Wise SA, Camara JE, Burdette CQ, Hahm G, Nalin F, Kuszak AJ, Merkel J, Durazo-Arvizu RA, Williams EL, Hoofnagle AN, Ivison F, Fischer R, van den Ouweland JMW, Ho CS, Law EWK, Simard JN, Gonthier R, Holmquist B, Meadows S, Cox L, Robyak K, Creer MH, Fitzgerald R, Clarke MW, Breen N, Lukas P, Cavalier É, Sempos CT. Interlaboratory comparison of 25-hydroxyvitamin D assays: Vitamin D Standardization Program (VDSP) Intercomparison Study 2 - Part 1 liquid chromatography - tandem mass spectrometry (LC-MS/MS) assays - impact of 3-epi-25-hydroxyvitamin D 3 on assay performance. Anal Bioanal Chem 2021; 414:333-349. [PMID: 34432104 DOI: 10.1007/s00216-021-03576-1] [Citation(s) in RCA: 14] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/29/2021] [Revised: 07/15/2021] [Accepted: 07/23/2021] [Indexed: 12/19/2022]
Abstract
An interlaboratory comparison study was conducted by the Vitamin D Standardization Program (VDSP) to assess the performance of liquid chromatography - tandem mass spectrometry (LC-MS/MS) assays used for the determination of serum total 25-hydroxyvitamin D (25(OH)D), which is the sum of 25-hydroxyvitamin D2 (25(OH)D2) and 25-hydroxyvitamin D3 (25(OH)D3). A set of 50 single-donor samples was assigned target values for concentrations of 25(OH)D2, 25(OH)D3, 3-epi-25-hydroxyvitamin D3 (3-epi-25(OH)D3), and 24R,25-dihydroxyvitamin D3 (24R,25(OH)2D3) using isotope dilution liquid chromatography - tandem mass spectrometry (ID LC-MS/MS). VDSP Intercomparison Study 2 Part 1 includes results from 14 laboratories using 14 custom LC-MS/MS assays. Assay performance was evaluated using mean % bias compared to the assigned target values and using linear regression analysis of the test assay mean results and the target values. Only 53% of the LC-MS/MS assays met the VDSP criterion of mean % bias ≤ |±5%|. For the LC-MS/MS assays not meeting the ≤ |±5%| criterion, four assays had mean % bias of between 12 and 21%. Based on multivariable regression analysis using the concentrations of the four individual vitamin D metabolites in the 50 single-donor samples, the performance of several LC-MS/MS assays was found to be influenced by the presence of 3-epi-25(OH)D3. The results of this interlaboratory study represent the most comprehensive comparison of LC-MS/MS assay performance for serum total 25(OH)D and document the significant impact of the lack of separation of 3-epi-25(OH)D3 and 25(OH)D3 on assay performance, particularly with regard to mean % bias.
Collapse
Affiliation(s)
- Stephen A Wise
- Office of Dietary Supplements (ODS), National Institutes of Health (NIH), Bethesda, MD, 20892, USA. .,Scientist Emeritus, National Institute of Standards and Technology (NIST), Gaithersburg, MD, 20899, USA.
| | - Johanna E Camara
- Chemical Sciences Division, National Institute of Standards and Technology (NIST), Gaithersburg, MD, 20899, USA
| | - Carolyn Q Burdette
- Chemical Sciences Division, National Institute of Standards and Technology (NIST), Gaithersburg, MD, 20899, USA
| | - Grace Hahm
- Chemical Sciences Division, National Institute of Standards and Technology (NIST), Gaithersburg, MD, 20899, USA
| | - Federica Nalin
- Chemical Sciences Division, National Institute of Standards and Technology (NIST), Gaithersburg, MD, 20899, USA
| | - Adam J Kuszak
- Office of Dietary Supplements (ODS), National Institutes of Health (NIH), Bethesda, MD, 20892, USA
| | - Joyce Merkel
- Office of Dietary Supplements (ODS), National Institutes of Health (NIH), Bethesda, MD, 20892, USA
| | - Ramón A Durazo-Arvizu
- Biostatistics Core, The Sabin Research Institute, Keck School of Medicine, University of Southern California, Los Angeles, CA, 90027, USA
| | | | - Andrew N Hoofnagle
- Department of Laboratory Medicine, University of Washington, Seattle, WA, 98185, USA
| | - Fiona Ivison
- Central Manchester Foundation Trust, Manchester, M13 9WL, UK
| | - Ralf Fischer
- Chromsystems Instruments & Chemicals GmbH, 82166, Gräfelfing, Germany
| | | | - Chung S Ho
- Biochemical Mass Spectrometry Unit, Department of Chemical Pathology, The Chinese University of Hong Kong, Prince of Wales Hospital, Hong Kong, 999077, Hong Kong
| | - Emmett W K Law
- Biochemical Mass Spectrometry Unit, Department of Chemical Pathology, The Chinese University of Hong Kong, Prince of Wales Hospital, Hong Kong, 999077, Hong Kong
| | | | | | - Brett Holmquist
- Endocrine Sciences, LabCorp Specialty Testing Group, Agoura Hills, CA, 91301, USA
| | - Sarah Meadows
- Medical Research Council (MRC) Elsie Widdowson Laboratory (closed Dec. 2018), Cambridge, UK.,NIHR BRC Nutritional Biomarker Laboratory, MRC Epidemiology Unit, University of Cambridge, Cambridge, CB2 0SL, UK
| | - Lorna Cox
- Medical Research Council (MRC) Elsie Widdowson Laboratory (closed Dec. 2018), Cambridge, UK.,NIHR BRC Nutritional Biomarker Laboratory, MRC Epidemiology Unit, University of Cambridge, Cambridge, CB2 0SL, UK
| | - Kimberly Robyak
- College of Medicine, Penn State University, Hershey, PA, 17033, USA
| | - Michael H Creer
- College of Medicine, Penn State University, Hershey, PA, 17033, USA
| | - Robert Fitzgerald
- Health Clinical Laboratories, University of California at San Diego, La Jolla, CA, 92093, USA
| | - Michael W Clarke
- Metabolomics Australia, Centre for Microscopy, Characterisation and Analysis, The University of Western Australia, Perth, WA, 6009, Australia
| | - Norma Breen
- Waters Technologies Ireland Ltd., Wexford, Y35 D431, Ireland
| | - Pierre Lukas
- Clinical Chemistry, University of Liège, CHU de Liège, B-4000, Liège, Belgium
| | - Étienne Cavalier
- Clinical Chemistry, University of Liège, CHU de Liège, B-4000, Liège, Belgium
| | - Christopher T Sempos
- Office of Dietary Supplements (ODS), National Institutes of Health (NIH), Bethesda, MD, 20892, USA.,Vitamin D Standardization Program LLC, Havre de Grace, MD, 217078, USA
| |
Collapse
|
7
|
Camara JE, Wise SA, Hoofnagle AN, Williams EL, Carter GD, Jones J, Burdette CQ, Hahm G, Nalin F, Kuszak AJ, Merkel J, Durazo-Arvizu RA, Lukas P, Cavalier É, Popp C, Beckert C, Schultess J, Van Slooten G, Tourneur C, Pease C, Kaul R, Villarreal A, Ivison F, Fischer R, van den Ouweland JMW, Ho CS, Law EWK, Simard JN, Gonthier R, Holmquist B, Batista MC, Pham H, Bennett A, Meadows S, Cox L, Jansen E, Khan DA, Robyak K, Creer MH, Kilbane M, Twomey PJ, Freeman J, Parker N, Yuan J, Fitzgerald R, Mushtaq S, Clarke MW, Breen N, Simpson C, Sempos CT. Assessment of serum total 25-hydroxyvitamin D assay commutability of Standard Reference Materials and College of American Pathologists Accuracy-Based Vitamin D (ABVD) Scheme and Vitamin D External Quality Assessment Scheme (DEQAS) materials: Vitamin D Standardization Program (VDSP) Commutability Study 2. Anal Bioanal Chem 2021; 413:5067-5084. [PMID: 34184102 PMCID: PMC8431775 DOI: 10.1007/s00216-021-03470-w] [Citation(s) in RCA: 12] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/06/2021] [Revised: 05/29/2021] [Accepted: 06/09/2021] [Indexed: 10/21/2022]
Abstract
An interlaboratory study was conducted through the Vitamin D Standardization Program (VDSP) to assess commutability of Standard Reference Materials® (SRMs) and proficiency testing/external quality assessment (PT/EQA) samples for determination of serum total 25-hydroxyvitamin D [25(OH)D] using ligand binding assays and liquid chromatography-tandem mass spectrometry (LC-MS/MS). A set of 50 single-donor serum samples were assigned target values for 25-hydroxyvitamin D2 [25(OH)D2] and 25-hydroxyvitamin D3 [25(OH)D3] using reference measurement procedures (RMPs). SRM and PT/EQA samples evaluated included SRM 972a (four levels), SRM 2973, six College of American Pathologists (CAP) Accuracy-Based Vitamin D (ABVD) samples, and nine Vitamin D External Quality Assessment Scheme (DEQAS) samples. Results were received from 28 different laboratories using 20 ligand binding assays and 14 LC-MS/MS methods. Using the test assay results for total serum 25(OH)D (i.e., the sum of 25(OH)D2 and 25(OH)D3) determined for the single-donor samples and the RMP target values, the linear regression and 95% prediction intervals (PIs) were calculated. Using a subset of 42 samples that had concentrations of 25(OH)D2 below 30 nmol/L, one or more of the SRM and PT/EQA samples with high concentrations of 25(OH)D2 were deemed non-commutable using 5 of 11 unique ligand binding assays. SRM 972a (level 4), which has high exogenous concentration of 3-epi-25(OH)D3, was deemed non-commutable for 50% of the LC-MS/MS assays.
Collapse
Affiliation(s)
- Johanna E Camara
- Chemical Sciences Division, National Institute of Standards and Technology (NIST), Gaithersburg, MD, 20899, USA
| | - Stephen A Wise
- Scientist Emeritus, National Institute of Standards and Technology (NIST), Gaithersburg, MD, 20899, USA.
- Office of Dietary Supplements (ODS), National Institutes of Health (NIH), Bethesda, MD, 20892, USA.
| | - Andrew N Hoofnagle
- Department of Laboratory Medicine, University of Washington, Seattle, WA, 98185, USA
| | | | | | - Julia Jones
- Imperial Healthcare NHS Trust, London, W6 8RF, UK
| | - Carolyn Q Burdette
- Chemical Sciences Division, National Institute of Standards and Technology (NIST), Gaithersburg, MD, 20899, USA
| | - Grace Hahm
- Chemical Sciences Division, National Institute of Standards and Technology (NIST), Gaithersburg, MD, 20899, USA
| | - Federica Nalin
- Chemical Sciences Division, National Institute of Standards and Technology (NIST), Gaithersburg, MD, 20899, USA
| | - Adam J Kuszak
- Office of Dietary Supplements (ODS), National Institutes of Health (NIH), Bethesda, MD, 20892, USA
| | - Joyce Merkel
- Office of Dietary Supplements (ODS), National Institutes of Health (NIH), Bethesda, MD, 20892, USA
| | - Ramón A Durazo-Arvizu
- Biostatistics Core, The Sabin Research Institute, Keck School of Medicine, University of Southern California, Los Angeles, CA, 90027, USA
| | - Pierre Lukas
- Clinical Chemistry, University of Liège, CHU de Liège, 4000, Liège, Belgium
| | - Étienne Cavalier
- Clinical Chemistry, University of Liège, CHU de Liège, 4000, Liège, Belgium
| | - Christian Popp
- Abbott Laboratories, ADD Wiesbaden Abbott GmbH, 65205, Wiesbaden, Germany
| | - Christian Beckert
- Abbott Laboratories, ADD Wiesbaden Abbott GmbH, 65205, Wiesbaden, Germany
| | - Jan Schultess
- Abbott Laboratories, ADD Wiesbaden Abbott GmbH, 65205, Wiesbaden, Germany
| | | | | | | | - Ravi Kaul
- Clinical Diagnostics, Bio-Rad Laboratories, Clinical Diagnostics, Hercules, CA, 94547, USA
| | - Alfredo Villarreal
- Clinical Diagnostics, Bio-Rad Laboratories, Clinical Diagnostics, Hercules, CA, 94547, USA
| | - Fiona Ivison
- Central Manchester Foundation Trust, Manchester, M13 9WL, UK
| | - Ralf Fischer
- Chromsystems Instruments & Chemicals GmbH, 82166, Gräfelfing, Germany
| | | | - Chung S Ho
- Biomedical Mass Spectrometry Unit, Department of Chemical Pathology, The Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, 999077, Hong Kong
| | - Emmett W K Law
- Biomedical Mass Spectrometry Unit, Department of Chemical Pathology, The Chinese University of Hong Kong, Prince of Wales Hospital, Shatin, 999077, Hong Kong
| | | | | | - Brett Holmquist
- LabCorp Specialty Testing Group, Endocrine Sciences, Agoura Hills, CA, 91301, USA
| | | | - Heather Pham
- Immunodiagnostic Systems (IDS), Boldon, NE35 9PD, UK
| | - Alex Bennett
- Immunodiagnostic Systems (IDS), Boldon, NE35 9PD, UK
| | - Sarah Meadows
- Medical Research Council (MRC) Elsie Widdowson Laboratory (closed Dec. 2018), Cambridge, CB2 0SL, UK
- NIHR BRC Nutritional Biomarker Laboratory, MRC Epidemiology Unit, University of Cambridge, Cambridge, CB2 0SL, UK
| | - Lorna Cox
- Medical Research Council (MRC) Elsie Widdowson Laboratory (closed Dec. 2018), Cambridge, CB2 0SL, UK
- NIHR BRC Nutritional Biomarker Laboratory, MRC Epidemiology Unit, University of Cambridge, Cambridge, CB2 0SL, UK
| | - Eugene Jansen
- National Institute of Public Health and the Environment (RIVM), 3720 BA, Bilthoven, The Netherlands
| | - Dilshad Ahmed Khan
- National University of Medical Sciences (NUMS), Rawalpindi, Punjab, 46000, Pakistan
| | - Kimberly Robyak
- College of Medicine, Penn State University, Hershey, PA, 17033, USA
| | - Michael H Creer
- College of Medicine, Penn State University, Hershey, PA, 17033, USA
| | - Mark Kilbane
- Clinical Chemistry, St. Vincent's University Hospital, Elm Park, Dublin 4, D04 T6F4, Ireland
| | - Patrick J Twomey
- Clinical Chemistry, St. Vincent's University Hospital, Elm Park, Dublin 4, D04 T6F4, Ireland
| | | | - Neil Parker
- Siemens-Healthineers, Tarrytown, NY, 10591, USA
| | - Jinyun Yuan
- SNIBE, Shenzhen, 518122, People's Republic of China
| | - Robert Fitzgerald
- University of California at San Diego, Health Clinical Laboratories, La Jolla, CA, 92093, USA
| | | | - Michael W Clarke
- Metabolomics Australia, Centre for Microscopy, Characterisation and Analysis, The University of Western Australia, Perth, WA, 6009, Australia
| | - Norma Breen
- Waters Technologies Ireland Ltd., Wexford, Y35 D431, Ireland
| | | | - Christopher T Sempos
- Office of Dietary Supplements (ODS), National Institutes of Health (NIH), Bethesda, MD, 20892, USA
- Vitamin D Standardization Program LLC, Havre de Grace, MD, 21078, USA
| |
Collapse
|
8
|
Spahn M, Strotzer M, Völk M, Böhm S, Geiger B, Hahm G, Feuerbach S. Digital radiography with a large-area, amorphous-silicon, flat-panel X-ray detector system. Invest Radiol 2000; 35:260-6. [PMID: 10764095 DOI: 10.1097/00004424-200004000-00007] [Citation(s) in RCA: 45] [Impact Index Per Article: 1.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
RATIONALE AND OBJECTIVES To investigate the image quality of a digital radiography system with an amorphous-silicon, large-area, digital flat-panel detector. METHODS A flat-panel detector based on a matrix of amorphous silicon was integrated into a projection radiography system. The scintillator consisted of a layer of structured cesium iodide. The active matrix size of 30002 pixels together with a pixel size of 143 microm provided a large image area of 43 x 43 cm2. Basic image quality parameters such as detective quantum efficiency (DQE) and modulation transfer function (MTF) were measured and compared with those obtained with conventional systems. RESULTS The measurement of DQE yielded a high value of 70% at zero spatial frequency. At a system dose equivalent to 400 speed, the DQE of the digital system was a factor of two larger than the DQE of a storage phosphor or screen-film system within the entire spatial frequency range between zero and the Nyquist limit of 3.5 line pairs per millimeter. The flat-panel detector furthermore has an MTF that is superior to that in regular screen-film systems and also provides a substantially larger dynamic range. CONCLUSIONS This new technology demonstrates its potential to provide equal or superior image quality to conventional screen-film systems and to reduce patient exposure to radiation dose. The advantages of digital radiography systems, based on a flat-panel detector as an instant image display, facilitation of work flow in the radiology department, and digital networking and archiving, are well in sight.
Collapse
Affiliation(s)
- M Spahn
- Siemens AG, Medical Engineering, Angio, Fluoro, and Rad Systems Development, Forchheim, Germany.
| | | | | | | | | | | | | |
Collapse
|
9
|
Verheggen R, Schulte-Baumann WJ, Hahm G, Lang J, Freudenthaler S, Schaake T, Markakis E. A new technique of dural closure--experience with a vicryl mesh. Acta Neurochir (Wien) 1998; 139:1074-9. [PMID: 9442223 DOI: 10.1007/bf01411563] [Citation(s) in RCA: 40] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Abstract
Treatment of postoperative dural CSF leaks following posterior fossa surgery remains a difficult and often perplexing problem. Their management includes either non-operative management or surgical re-exploration. In order to avoid CSF leaks we developed a simple but effective method using a well-cut sheet of a vicryl-poly-p-dioxanone mesh (Ethisorb) covering the whole defect of the craniectomy. This paper presents our technique of dural closure, experiences with and advantages of the vicryl mesh in comparison with conventional procedures using muscle patches in combination with fibrin sealant or fibrin glue alone. Attention is focused upon the frequency of postoperative complications, in particular infection rate and CSF leaks. Furthermore, histomorphological observations after implantation of a vicryl mesh are demonstrated. In conclusion, due to its specific qualities we consider the vicryl mesh as a suitable dural substitute with potential advantages over currently used material.
Collapse
Affiliation(s)
- R Verheggen
- Department of Neurosurgery, University Hospital and School of Medicine, Göttingen, Federal Republic of Germany
| | | | | | | | | | | | | |
Collapse
|