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Arnaud J, Weykamp C, Wenzel R, Patriarca M, González-Estecha M, Janssen L, Fofou-Caillierez MB, Alemany MV, Patriarca V, de Graaf I, Persoons R, Panadès M, China B, Winkel MT, van der Vuurst H, Thelen M. Analytical performance specifications for trace elements in biological fluids derived from six countries federated external quality assessment schemes over 10 years. Clin Chem Lab Med 2024; 0:cclm-2024-0551. [PMID: 39027966 DOI: 10.1515/cclm-2024-0551] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/02/2024] [Accepted: 07/07/2024] [Indexed: 07/20/2024]
Abstract
OBJECTIVES This article defines analytical performance specifications (APS) for evaluating laboratory proficiency through an external quality assessment scheme. METHODS Standard deviations for proficiency assessment were derived from Thompson's characteristic function applied to robust data calculated from participants' submissions in the Occupational and Environmental Laboratory Medicine (OELM) external quality assurance scheme for trace elements in serum, whole blood and urine. Characteristic function was based on two parameters: (1) β - the average coefficient of variation (CV) at high sample concentrations; (2) α - the average standard deviation (SD) at low sample concentrations. APSs were defined as 1.65 standard deviations calculated by Thompson's approach. Comparison between OELM robust data and characteristic function were used to validate the model. RESULTS Application of the characteristic function allowed calculated APS for 18 elements across three matrices. Some limitations were noted, particularly for elements (1) with no sample concentrations near analytical technique limit of detection; (2) exhibiting high robust CV at high concentration; (3) exhibiting high analytical variability such as whole blood Tl and urine Pb; (4) with an unbalanced number of robust SD above and under the characteristic function such as whole blood Mn and serum Al and Zn. CONCLUSIONS The characteristic function was a useful means of deriving APS for trace elements in biological fluids where biological variation data or outcome studies were not available. However, OELM external quality assurance scheme data suggests that the characteristic functions are not appropriate for all elements.
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Affiliation(s)
- Josiane Arnaud
- Member of French Society for Clinical Biology (SFBC), and French Speaking Society for Trace Elements, Vitamins and Biofactors (SETViB), Paris, France
| | - Cas Weykamp
- MCA Laboratory, Queen Beatrix Hospital, Winterswijk, The Netherlands
| | - Ross Wenzel
- Pathology NSW, Royal North Shore Hospital, St Leonards, NSW, Australia
| | - Marina Patriarca
- Department of Food Safety, Nutrition and Veterinary Public Health, Istituto Superiore di Sanità, Rome, Italy
| | | | - Liesbeth Janssen
- MCA Laboratory, Queen Beatrix Hospital, Winterswijk, The Netherlands
| | | | | | - Valeria Patriarca
- Department of Food Safety, Nutrition and Veterinary Public Health, Istituto Superiore di Sanità, Rome, Italy
| | - Irene de Graaf
- MCA Laboratory, Queen Beatrix Hospital, Winterswijk, The Netherlands
| | - Renaud Persoons
- University of Grenoble Alpes, CNRS, Grenoble INP, CHU Grenoble Alpes, TIMC, Grenoble, France
| | - Mariona Panadès
- External Quality Assessment Schemes, Spanish Society of Laboratory Medicine, Barcelona, Spain
| | - Bernard China
- Department of Quality of Laboratories, Sciensano, Brussels, Belgium
| | - Marieke Te Winkel
- MCA Laboratory, Queen Beatrix Hospital, Winterswijk, The Netherlands
| | | | - Marc Thelen
- Foundation of Quality Assurance in Laboratory Medicine (SKML), Nijmegen, The Netherlands
- Department of Laboratory Medicine, Radboud University Medical Center, Nijmegen, The Netherlands
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Handley SA, Wanandy T, Prentice L. Validation of the Randox colorimetric assays for serum copper and zinc. Ann Clin Biochem 2023:45632231208337. [PMID: 37789002 DOI: 10.1177/00045632231208337] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/05/2023]
Abstract
BACKGROUND Serum copper and zinc are measured to assess deficiency and toxicity. Atomic absorption spectrophotometry and mass spectrometry methods are expensive and require highly trained staff. Colorimetric assays are available from Randox which are inexpensive and can be automated. We validated serum copper and zinc colorimetric assays on the Binding Site Optilite analyser including comparison with flame atomic absorption spectrophotometry (FAAS) and inductively coupled plasma-mass spectrometry (ICP-MS). METHODS Accuracy, imprecision, lower limit of quantitation, and linearity were ascertained. The impact of triglycerides, bilirubin, nickel, and iron on assay performance was also investigated. Comparison of results from colorimetric analysis of patient and external quality assurance samples with those obtained by FAAS and ICP-MS was undertaken. RESULTS Intra-, and inter-assay imprecision was <9%. Serum copper and zinc assays were linear between 1.8-35.6 and 2.3-45.7 µmol/L, respectively. Agreement was good between colorimetry and FAAS (intercept = -0.7, slope = 1.04) and ICP-MS (intercept = 0.6, slope = 0.99) for serum copper in patients' samples. For serum zinc, agreement was poor between colorimetry and FAAS (intercept = 2.2, slope = 0.87) and ICP-MS (intercept = 1.9, slope = 0.98) in patients' samples. There was a poor concordance in assessment of hypozincaemia between colorimetry and FAAS/ICP-MS. CONCLUSION The Randox colorimetric assay for serum copper on the Optilite is simple to perform, has a short analysis time, and measured concentrations compare well with FAAS and ICP-MS. Due to poor agreement with FAAS and ICP-MS, colorimetry is not suitable for the measurement of serum zinc.
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Affiliation(s)
- Simon A Handley
- Biochemistry, Department of Pathology, Royal Hobart Hospital, Hobart, TAS, Australia
- School of Medicine, University of Tasmania, Menzies Institute for Medical Research, Hobart, TAS, Australia
| | - Troy Wanandy
- School of Medicine, University of Tasmania, Menzies Institute for Medical Research, Hobart, TAS, Australia
- Department of Clinical Immunology and Allergy, Royal Hobart Hospital, Hobart, TAS, Australia
| | - Louise Prentice
- Biochemistry, Department of Pathology, Royal Hobart Hospital, Hobart, TAS, Australia
- School of Medicine, University of Tasmania, Menzies Institute for Medical Research, Hobart, TAS, Australia
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Killilea DW, Schultz K. Pre-analytical variables influence zinc measurement in blood samples. PLoS One 2023; 18:e0286073. [PMID: 37713369 PMCID: PMC10503700 DOI: 10.1371/journal.pone.0286073] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/14/2023] [Accepted: 05/08/2023] [Indexed: 09/17/2023] Open
Abstract
Zinc deficiency continues to be a major concern for global public health. The zinc status of a target population is typically estimated by measuring circulating zinc levels, but the sampling procedures are not standardized and thus may result in analytical discrepancies. To examine this, we designed a study that controlled most of the technical parameters in order to focus on five pre-analytical variables reported to influence the measurement of zinc in blood samples, including (1) blood draw site (capillary or venous), (2) blood sample matrix (plasma or serum), (3) blood collection tube manufacturer (Becton, Dickinson and Company or Sarstedt AG & Co), (4) blood processing time (0, 4, or 24 hours), and (5) blood holding temperatures (4°C, 20°C, or 37°C). A diverse cohort of 60 healthy adults were recruited to provide sequential capillary and venous blood samples, which were carefully processed under a single chain of custody and measured for zinc content using inductively coupled plasma optical emission spectrometry. When comparing blood draw sites, the mean zinc content of capillary samples was 0.054 mg/L (8%; p<0.0001) higher than venous blood from the same donors. When comparing blood sample matrices, the mean zinc content of serum samples was 0.029 mg/L (5%; p<0.0001) higher than plasma samples from the same donors. When comparing blood collection tube manufacturer, the mean zinc content from venous blood samples did not differ between venders, but the mean zinc content from BD capillary plasma was 0.036 mg/L (6%; p<0.0001) higher than Sarstedt capillary plasma from the same donors. When comparing processing times, the mean zinc content of plasma and serum samples was 5-12% higher (p<0.0001) in samples processed 4-24 hour after collection. When comparing holding temperatures, the mean zinc content of plasma and serum samples was 0.5-7% higher (p = 0.0007 or p = 0.0061, respectively) in samples temporarily held at 20°C or 37°C after collection. Thus even with the same donors and blood draws, significant differences in zinc content were observed with different draw sites, tube types, and processing procedures, demonstrating that key pre-analytic variables can have an impact on zinc measurement, and subsequent classification of zinc status. Minimizing these pre-analytical variables is important for generating best practice guidelines for assessment of zinc status.
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Affiliation(s)
- David W. Killilea
- Office of Research, University of California San Francisco, San Francisco, California, United States of America
| | - Kathleen Schultz
- Office of Research, University of California San Francisco, San Francisco, California, United States of America
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Leger M, Despinasse Q, Faure P, Arnaud J, Ravelet C, Chovelon B. Influence of delayed separation of plasma from whole blood and centrifugation protocol on Zn plasma concentration. Clin Chem Lab Med 2021; 58:e279-e281. [PMID: 32609637 DOI: 10.1515/cclm-2020-0380] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/25/2020] [Accepted: 06/02/2020] [Indexed: 11/15/2022]
Affiliation(s)
- Mandy Leger
- Institute of Biology and Pathology, University Hospital of Grenoble and Alps, Grenoble, France
| | - Quentin Despinasse
- Institute of Biology and Pathology, University Hospital of Grenoble and Alps, Grenoble, France
| | - Patrice Faure
- Institute of Biology and Pathology, University Hospital of Grenoble and Alps, Grenoble, France
- University Grenoble Alpes, Laboratory of Hypoxy Physiopathology Study Inserm U1042, La Tronche, France
| | - Josiane Arnaud
- Institute of Biology and Pathology, University Hospital of Grenoble and Alps, Grenoble, France
| | - Corinne Ravelet
- University Grenoble Alpes, DPM UMR 5063, Grenoble, France
- CNRS, DPM UMR 5063, Grenoble, France
| | - Benoit Chovelon
- Institute of Biology and Pathology, University Hospital of Grenoble and Alps, Grenoble, France
- University Grenoble Alpes, DPM UMR 5063, Grenoble, France
- CNRS, DPM UMR 5063, Grenoble, France
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Are Obese Patients with Autism Spectrum Disorder More Likely to Be Selenium Deficient? Research Findings on Pre- and Post-Pubertal Children. Nutrients 2020; 12:nu12113581. [PMID: 33266486 PMCID: PMC7700552 DOI: 10.3390/nu12113581] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/28/2020] [Revised: 11/13/2020] [Accepted: 11/18/2020] [Indexed: 12/11/2022] Open
Abstract
Selenium is involved in many metabolic pathways that are critical for life. Information concerning the metabolic effects of selenium in autism spectrum disorder (ASD) and obesity is still conflicting and incomplete. The pre- and post-pubertal selenium profiles of patients with ASD and obesity have not yet been investigated. The goal of the study was to examine selenium content before and after puberty in euthyroid children diagnosed with ASD, compared to age-matched neurotypical controls, with respect to overweight or obesity as a co-existing pathology. Serum, toenail, and 24h urine selenium levels were determined by inductively coupled plasma mass spectrometry in 287 prepubertal children (mean age 8.09 years), divided into groups: ASD with overweight/obesity (ASD+/Ob+); ASD without overweight/obesity (ASD+/Ob-); non-ASD with overweight/obesity (ASD-/Ob+); and non-ASD without overweight/obesity (ASD-/Ob-). The assessment was repeated in 258 of the children after puberty (mean age 14.26 years).The lowest serum (p < 0.001), urine (p < 0.001) and toenail (p < 0.001) selenium levels before and after puberty were observed in ASD+/Ob+ patients, and the highest in ASD-/Ob-. There were no differences in serum/toenail selenium levels between ASD+/Ob- and ASD-/Ob+ groups. The presence of ASD was associatedwith lower serum (p < 0.001) and toenail (p < 0.001) selenium in BMI-matched groups. In neurotypical patients, post-pubertal serum selenium levels were lower (p < 0.001) than pre-pubertal levels. In the multiple linear regression analyses, selenium levels showed inverse relationships with BMI (p < 0.001) and male gender (p < 0.001), irrespective of the sample type. The serum (p = 0.002) and toenail (p < 0.001) selenium levels were inversely associated with the presence of ASD. ASD, obesity/overweight, and male gender have independent impacts on selenium levels in children. Puberty may affect selenium content in neurotypical children of both genders, but not in ASD patients.
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Arnaud J, Patriarca M, Fofou-Caillierez BM, González-Estecha M, Gómez MG, De Graaf I, Patriarca V, Ropert-Bouchet M, Schröer-Janssen L, Siebelder C, Te Winkel M, Ventura Alemany M, Weykamp C. External quality assessment schemes for inorganic elements in the clinical laboratory: Lessons from the OELM scheme. J Trace Elem Med Biol 2020; 59:126414. [PMID: 31810809 DOI: 10.1016/j.jtemb.2019.126414] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 06/03/2019] [Revised: 09/05/2019] [Accepted: 10/03/2019] [Indexed: 12/01/2022]
Abstract
Measurements of inorganic elements in clinical laboratories produce results used for the diagnosis, the treatment and the monitoring of deficiencies or overloads. The main objective of External Quality Assessment Schemes is to verify, on a regular frequency, that clinical laboratory results correspond to the quality requirement for patient care. Therefore, External Quality Assessment Schemes represent an essential component of a laboratory's quality management system. However, External Quality Assessment Schemes within the same analytical field remain heterogeneous for different reasons such as samples, determination of assigned value, acceptable limits, content of the reports. The aim of this review was to describe and illustrate some major critical aspects of External Quality Assessment Schemes based on Occupational and Environmental Laboratory Medicine external quality assessment scheme experience.
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Affiliation(s)
- Josiane Arnaud
- Unité de biochimie hormonale et nutritionnelle, Institut de Biologie et Pathologie, CHU Grenoble Alpes, CS 10217, 38043, Grenoble cedex 9, France.
| | - Marina Patriarca
- Istituto Superiore di Sanità, Viale Regina Elena 299, 00161, Roma (I), Italy.
| | - Béatrice Ma'atem Fofou-Caillierez
- Biochimie et Biologie Moléculaire, Nutrition et Métabolisme, Hôpital Brabois, CHRU Nancy, 5 rue du Morvan, 54511 Vandoeuvre-les-Nancy Cedex, France.
| | - Montserrat González-Estecha
- Servicio de Análisis Clínicos, IML. IdISSC, Hospital Clínico San Carlos, Calle Profesor Martín Lagos 1, 28040, Madrid, Spain.
| | - MªCarmen González Gómez
- Programas de Garantía Externa de la Calidad para Laboratorios Clínicos, Sociedad Española de Medicina de Laboratorio (SEQC-ML), Padilla 323, despacho 68, 08025 Barcelona, Spain.
| | - Irene De Graaf
- MCA Laboratorium, Streekziekenhuis Koningin Beatrix, Beatrixpark 1, Postbus 9005, 7100 GG Winterswijk, the Netherlands.
| | - Valeria Patriarca
- Istituto Superiore di Sanità, Viale Regina Elena 299, 00161, Roma (I), Italy.
| | - Martine Ropert-Bouchet
- Laboratoire de Biochimie Toxicologie, CHU de Rennes, 2 rue Henri Le Guilloux, 35033 Rennes cedex 9, France.
| | - Liesbeth Schröer-Janssen
- MCA Laboratorium, Streekziekenhuis Koningin Beatrix, Beatrixpark 1, Postbus 9005, 7100 GG Winterswijk, the Netherlands.
| | - Carla Siebelder
- MCA Laboratorium, Streekziekenhuis Koningin Beatrix, Beatrixpark 1, Postbus 9005, 7100 GG Winterswijk, the Netherlands.
| | - Marieke Te Winkel
- MCA Laboratorium, Streekziekenhuis Koningin Beatrix, Beatrixpark 1, Postbus 9005, 7100 GG Winterswijk, the Netherlands.
| | - Montserrat Ventura Alemany
- Programas de Garantía Externa de la Calidad para Laboratorios Clínicos, Sociedad Española de Medicina de Laboratorio (SEQC-ML), Padilla 323, despacho 68, 08025 Barcelona, Spain.
| | - Cas Weykamp
- MCA Laboratorium, Streekziekenhuis Koningin Beatrix, Beatrixpark 1, Postbus 9005, 7100 GG Winterswijk, the Netherlands.
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Xia SA, Leng A, Lin Y, Wu L, Tian Y, Hou X, Zheng C. Integration of Flow Injection Capillary Liquid Electrode Discharge Optical Emission Spectrometry and Microplasma-Induced Vapor Generation: A System for Detection of Ultratrace Hg and Cd in a Single Drop of Human Whole Blood. Anal Chem 2019; 91:2701-2709. [DOI: 10.1021/acs.analchem.8b04222] [Citation(s) in RCA: 25] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/20/2022]
Affiliation(s)
- Shu-an Xia
- Key Laboratory of Green Chemistry & Technology of MOE, College of Chemistry, Sichuan University, Chengdu, Sichuan 610064, China
| | - Anqin Leng
- Sichuan Center for Disease Control and Prevention, Chengdu, Sichuan 610041, China
| | - Yao Lin
- Key Laboratory of Green Chemistry & Technology of MOE, College of Chemistry, Sichuan University, Chengdu, Sichuan 610064, China
| | - Li Wu
- Analytical & Testing Center, Sichuan University, Chengdu, Sichuan 610064, China
| | - Yunfei Tian
- Analytical & Testing Center, Sichuan University, Chengdu, Sichuan 610064, China
| | - Xiandeng Hou
- Key Laboratory of Green Chemistry & Technology of MOE, College of Chemistry, Sichuan University, Chengdu, Sichuan 610064, China
- Analytical & Testing Center, Sichuan University, Chengdu, Sichuan 610064, China
| | - Chengbin Zheng
- Key Laboratory of Green Chemistry & Technology of MOE, College of Chemistry, Sichuan University, Chengdu, Sichuan 610064, China
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Chovelon B, Arnaud J. Influence of delayed separation of plasma from whole blood on Cu, I, Mn, Se, and Zn plasma concentrations. ACTA ACUST UNITED AC 2017; 56:e69-e71. [DOI: 10.1515/cclm-2017-0358] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/27/2017] [Accepted: 09/11/2017] [Indexed: 12/27/2022]
Affiliation(s)
- Benoit Chovelon
- Department of Biochemistry, Toxicology and Pharmacology , University Hospital of Grenoble and Alps , Grenoble , France
| | - Josiane Arnaud
- Department of Biochemistry, Toxicology and Pharmacology , University Hospital of Grenoble and Alps , CS 10217 , 38043 Grenoble Cedex 9 , France
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Kraus FB, Ludwig-Kraus B. Measuring zinc on the Roche cobas c502 analyzer-Validation, comparison, and pre-analytic aspects. J Clin Lab Anal 2017; 32. [PMID: 28187231 DOI: 10.1002/jcla.22169] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/30/2016] [Accepted: 01/14/2017] [Indexed: 12/30/2022] Open
Abstract
OBJECTIVES Characterization of an in vitro diagnostic zinc assay (LT-SYS) on a Roche cobas c502 analyzer and evaluation of the influence of pre-analytic factors on zinc concentration measurements. DESIGN AND METHODS Imprecision, bias, linearity, limit of blank (LoB), and limit of detection (LoD) were established and method comparisons were performed based on the respective CLSI guidelines. The influence of time elapsed until analysis, the usage of a pneumatic tube delivery system (PTDS) and of special trace element sample tubes was evaluated as well. RESULTS Estimates of imprecision ranged from 0.9% to 5.0% and bias was low with 1.3% and 1.5% deviation from target value. Linearity was met for the measuring range of 1.15-34.7 μmol/L (7.51-226.9 μg/dL), LoB and LoD were 0.17 μmol/L (1.11 μg/dL) and 0.73 μmol/L (4.77 μg/dL) respectively. The method comparison revealed an average deviation of 8.44% (y=0.542+1.036x). Plasma samples had 7.3% higher zinc values than serum samples on the average. Zinc values of uncentrifuged serum and plasma samples increased 20% in 8 hours, while after centrifugation no significant increase could be detected. Usage of PTDS increased zinc values by 17% and usage of trace element sample tubes showed no advantage over normal ones. CONCLUSIONS The LT-SYS zinc assay showed a fully acceptable performance with good degrees of imprecision and bias, no deviation from linearity and both a very low LoB and LoD. Samples for zinc analysis should be centrifuged timely and transport over PTDS should be avoided.
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Affiliation(s)
- Frank Bernhard Kraus
- Zentrallabor, Department of Laboratory Medicine, University Hospital Halle, Halle (Saale), Germany.,Department of Biology, Martin-Luther-University Halle-Wittenberg, Halle (Saale), Germany
| | - Beatrice Ludwig-Kraus
- Zentrallabor, Department of Laboratory Medicine, University Hospital Halle, Halle (Saale), Germany
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Huszank R, Csedreki L, Török Z. Direct Trace Element Analysis of Liquid Blood Samples by In-Air Ion Beam Analytical Techniques (PIXE–PIGE). Anal Chem 2017; 89:1558-1564. [DOI: 10.1021/acs.analchem.6b03541] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
Affiliation(s)
- Robert Huszank
- Institute for Nuclear Research, Hungarian Academy of Sciences (MTA Atomki), P.O. Box 51, H-4001 Debrecen, Hungary
| | - László Csedreki
- Institute for Nuclear Research, Hungarian Academy of Sciences (MTA Atomki), P.O. Box 51, H-4001 Debrecen, Hungary
| | - Zsófia Török
- Institute for Nuclear Research, Hungarian Academy of Sciences (MTA Atomki), P.O. Box 51, H-4001 Debrecen, Hungary
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Kraus FB, Mischereit M, Eller C, Ludwig-Kraus B. Characterization and Validation of the LT-SYS Copper Assay on a Roche Cobas 8000 c502 Analyzer. Lab Med 2016; 48:10-17. [DOI: 10.1093/labmed/lmw049] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022] Open
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Praamsma ML, Arnaud J, Bisson D, Kerr S, Harrington CF, Parsons PJ. An assessment of clinical laboratory performance for the determination of manganese in blood and urine. ACTA ACUST UNITED AC 2016; 54:1921-1928. [DOI: 10.1515/cclm-2015-1267] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/28/2015] [Accepted: 03/28/2016] [Indexed: 01/04/2023]
Abstract
AbstractBackground:Proficiency testing or external quality assessment schemes (PT/EQASs) are an important method of assessing laboratory performance. As each scheme establishes assigned values and acceptable ranges for the analyte according to its own criteria, monitoring of participant performance varies according to the scheme and can lead to conflicting conclusions.Methods:Standard deviations (SDs) for PT were derived from Thompson’s and biological variation models applied to blood and urine manganese (Mn) robust data from four EQASs from North America and Europe. The fitness for purpose was verified by applying these SDs to individual results.Results:Using Thompson characteristic function the relationship between SD and Mn concentration, expressed in nmol/L was the square root of [19.7Conclusions:The biological variation model can be used to propose quality specifications for blood, however it could not be applied to urine. The Thompson characteristic function model could be applied to derive quality specifications for Mn in urine and, to a lesser extent in blood. The more lenient quality specifications for blood highlight the difficulty of determining Mn in this matrix. Further work is needed to harmonize PT, such as using assigned ranges for the specimens.
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Bloom MS, Buck Louis GM, Sundaram R, Maisog JM, Steuerwald AJ, Parsons PJ. Birth outcomes and background exposures to select elements, the Longitudinal Investigation of Fertility and the Environment (LIFE). ENVIRONMENTAL RESEARCH 2015; 138:118-29. [PMID: 25707016 PMCID: PMC4385418 DOI: 10.1016/j.envres.2015.01.008] [Citation(s) in RCA: 38] [Impact Index Per Article: 4.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/19/2014] [Revised: 01/07/2015] [Accepted: 01/08/2015] [Indexed: 05/20/2023]
Abstract
Evidence suggests that trace exposures to select elements may increase the risk for adverse birth outcomes. To investigate further, we used multiple regression to assess associations between preconception parental exposures to Pb, Cd, and total Hg in blood, and 21 elements in urine, with n=235 singleton birth outcomes, adjusted for confounders and partner's exposure. Earlier gestational age at delivery (GA) was associated with higher tertiles of urine maternal W (-1.22 days) and paternal U (-1.07 days), but GA was later for higher tertiles of maternal (+1.11 days) and paternal (+1.30 days) blood Hg. Additional analysis indicated shorter GA associated with higher paternal urine Ba, W, and U, and with higher maternal blood Pb for boys, but GA was longer in association with higher maternal urine Cr. Birth weight (BW) was lower for higher tertiles of paternal urine Cs (-237.85g), U (-187.34g), and Zn (-209.08g), and for higher continuous Cr (P=0.021). In contrast, BW was higher for higher tertiles of paternal urine As (+194.71g) and counterintuitively for maternal blood Cd (+178.52g). Birth length (BL) was shorter for higher tertiles of urine maternal W (-1.22cm) and paternal U (-1.10cm). Yet, higher tertiles of maternal (+1.11cm) and paternal (+1.30) blood Hg were associated with longer BL. Head circumference at delivery was lower for higher tertiles of paternal urine U (-0.83cm), and for higher continuous Mo in boys (-0.57cm). Overall, associations were most consistently indicated for GA and measures of birth size with urine W and U, and paternal exposures were more frequently associated than maternal. Though limited by several factors, ours is the largest multi-element investigation of prospective couple-level trace exposures and birth outcomes to date; the novel observations for W and U merit further investigation.
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Affiliation(s)
- Michael S Bloom
- Department of Environmental Health Sciences, University at Albany School of Public Health, State University of New York, Rensselaer, NY, USA; Department of Epidemiology and Biostatistics, University at Albany School of Public Health, State University of New York, Rensselaer, NY, USA.
| | - Germaine M Buck Louis
- Division of Intramural Population Health Research, Eunice Kennedy Shriver National Institute of Child Health and Human Development, Rockville, MD, USA
| | - Rajeshwari Sundaram
- Division of Intramural Population Health Research, Eunice Kennedy Shriver National Institute of Child Health and Human Development, Rockville, MD, USA
| | - Jose M Maisog
- Division of Intramural Population Health Research, Eunice Kennedy Shriver National Institute of Child Health and Human Development, Rockville, MD, USA; Glotech, Incorporated, Rockville, MD, USA
| | - Amy J Steuerwald
- Department of Environmental Health Sciences, University at Albany School of Public Health, State University of New York, Rensselaer, NY, USA; Laboratory of Inorganic and Nuclear Chemistry, Wadsworth Center, New York State Department of Health, Albany, NY, USA
| | - Patrick J Parsons
- Department of Environmental Health Sciences, University at Albany School of Public Health, State University of New York, Rensselaer, NY, USA; Laboratory of Inorganic and Nuclear Chemistry, Wadsworth Center, New York State Department of Health, Albany, NY, USA
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Pineau A, Otz J, Guillard O, Fauconneau B, Dumont G, Françoise-Burg E. Interlaboratory comparison study on lead in blood, in external quality assessment schemes since 1996: a progress report. Toxicol Mech Methods 2014; 24:396-403. [DOI: 10.3109/15376516.2014.921965] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/13/2022]
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Chen S, Zhao Q, Liu F, Huang H, Wang L, Yi S, Zeng Y, Chen Y. Ultrasensitive Determination of Copper in Complex Biological Media Based on Modulation of Plasmonic Properties of Gold Nanorods. Anal Chem 2013; 85:9142-7. [DOI: 10.1021/ac401789n] [Citation(s) in RCA: 18] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/17/2023]
Affiliation(s)
- Shenna Chen
- Laboratory of
Theoretical Chemistry and Molecular Simulation of Ministry of Education,
School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan, Hunan, China
| | - Qian Zhao
- Laboratory of
Theoretical Chemistry and Molecular Simulation of Ministry of Education,
School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan, Hunan, China
| | - Fang Liu
- Laboratory of
Theoretical Chemistry and Molecular Simulation of Ministry of Education,
School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan, Hunan, China
| | - Haowen Huang
- Laboratory of
Theoretical Chemistry and Molecular Simulation of Ministry of Education,
School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan, Hunan, China
| | - Linqian Wang
- Department of
Laboratory, Hunan Provincial Tumor Hospital, the Affiliated Tumor Hospital of Xiangya Medical School of Central South University, Changsha, Hunan Province, China
| | - Shoujun Yi
- Laboratory of
Theoretical Chemistry and Molecular Simulation of Ministry of Education,
School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan, Hunan, China
| | - Yunlong Zeng
- Laboratory of
Theoretical Chemistry and Molecular Simulation of Ministry of Education,
School of Chemistry and Chemical Engineering, Hunan University of Science and Technology, Xiangtan, Hunan, China
| | - Yi Chen
- Key Laboratory of
Analytical Chemistry for Living Biosystems, Institute of Chemistry, Chinese Academy of Sciences, Beijing, China
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17
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McIntosh KG, Cusack MJ, Vershinin A, Chen ZW, Zimmerman EA, Molho ES, Celmins D, Parsons PJ. Evaluation of a prototype point-of-care instrument based on monochromatic x-ray fluorescence spectrometry: potential for monitoring trace element status of subjects with neurodegenerative disease. JOURNAL OF TOXICOLOGY AND ENVIRONMENTAL HEALTH. PART A 2012; 75:1253-1268. [PMID: 23030652 DOI: 10.1080/15287394.2012.709412] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/01/2023]
Abstract
Assessment of trace elements such as Cu, Zn, and Se in patients with neurodegenerative disease, such as Alzheimer's (AD) and Parkinson's disease (PD), may be useful in etiologic studies and in assessing the risk of developing these conditions. A prototype point-of-care (POC) instrument based on monochromatic x-ray fluorescence (M-XRF) was assembled and evaluated for the determination of Cu, Zn, and Se in whole blood, plasma, and urine. The prototype instrument was validated using certified reference materials for Cu and Zn in serum/plasma, and the reported bias and relative imprecision were <10%. The M-XRF prototype performance was further assessed using human specimens collected from AD and PD subjects, and was found to be satisfactory (<20% bias) for monitoring Cu and Zn levels in plasma and whole blood. However, the prototype M-XRF sensitivity was not sufficient for quantifying Cu, Zn, or Se in urine. Nonetheless, while validating the prototype instrument, body fluids (whole blood, plasma, and urine) were collected from 19 AD patients, 23 PD patients, and 24 controls specifically for trace element analysis using well-validated methods based on inductively coupled plasma mass spectrometry (ICP-MS). This limited biomonitoring study provided robust data for up to 16 elements including Sb, As, Ba, Cd, Cs, Co, Cr, Cu, Hg, Pb, Mo, Se, Tl, Sn, Zn, and U in plasma, whole blood, and urine. The results did not indicate any significant differences in most trace elements studied between AD or PD patients compared to controls, although the sample size is limited. A statistically significant increase in plasma Se was identified for PD patients relative to AD patients, but this could be due to age differences.
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Affiliation(s)
- Kathryn G McIntosh
- Laboratory of Inorganic and Nuclear Chemistry, Wadsworth Center, New York State Department of Health, Albany, NY 12201, USA
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18
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Palacios ER, Clavero A, Gonzalvo MC, Rosales A, Mozas J, Martinez L, Ramirez JP, Bjorndahl L, Morancho-Zaragoza J, Fernandez-Pardo E, Castilla JA. Acceptable variability in external quality assessment programmes for basic semen analysis. Hum Reprod 2011; 27:314-22. [DOI: 10.1093/humrep/der413] [Citation(s) in RCA: 24] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/12/2022] Open
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19
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Abstract
Assessing the quality of measurements is of interest to organizers of external quality assessment schemes (EQAS, or proficiency testing schemes), laboratory analysts and managers, users of laboratory results and other agencies. Scheme organizers run test programmes, define standards of acceptable and non-acceptable performance, and interact with participants and oversight authorities. Laboratory personnel are responsible for the quality management system and to choose whether to accept the standards set by scheme organizers or to adopt their own. Users receive and act upon the laboratory results. Schemes within the same analytical sector are often organized very differently causing contradictory assessment of performance. The Network of EQAS in occupational and environmental laboratory medicine established collaborative projects designed to enhance assessment of measurement quality and to improve the reliability of laboratory results. To address the issue of variations in assessing the quality of measurements, and in response to comments from some participants, standards derived from biological variation, rather than on the analytical performance of participants have been developed. Evaluation of test materials with respect to homogeneity and stability, and work on methods to give the assigned value to test materials, has also been undertaken. Following from these projects, further collaboration is planned which will provide better quality assessment of measurement to scheme participants and their users.
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Affiliation(s)
- Andrew Taylor
- Trace Element Centre, Faculty of Health and Medical Sciences, University of Surrey, Guildford, UK.
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20
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Maun HR, Wen X, Lingel A, de Sauvage FJ, Lazarus RA, Scales SJ, Hymowitz SG. Hedgehog pathway antagonist 5E1 binds hedgehog at the pseudo-active site. J Biol Chem 2010; 285:26570-80. [PMID: 20504762 DOI: 10.1074/jbc.m110.112284] [Citation(s) in RCA: 112] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/11/2023] Open
Abstract
Proper hedgehog (Hh) signaling is crucial for embryogenesis and tissue regeneration. Dysregulation of this pathway is associated with several types of cancer. The monoclonal antibody 5E1 is a Hh pathway inhibitor that has been extensively used to elucidate vertebrate Hh biology due to its ability to block binding of the three mammalian Hh homologs to the receptor, Patched1 (Ptc1). Here, we engineered a murine:human chimeric 5E1 (ch5E1) with similar Hh-binding properties to the original murine antibody. Using biochemical, biophysical, and x-ray crystallographic studies, we show that, like the regulatory receptors Cdon and Hedgehog-interacting protein (Hhip), ch5E1 binding to Sonic hedgehog (Shh) is enhanced by calcium ions. In the presence of calcium and zinc ions, the ch5E1 binding affinity increases 10-20-fold to tighter than 1 nm primarily because of a decrease in the dissociation rate. The co-crystal structure of Shh bound to the Fab fragment of ch5E1 reveals that 5E1 binds at the pseudo-active site groove of Shh with an epitope that largely overlaps with the binding site of its natural receptor antagonist Hhip. Unlike Hhip, the side chains of 5E1 do not directly coordinate the Zn(2+) cation in the pseudo-active site, despite the modest zinc-dependent increase in 5E1 affinity for Shh. Furthermore, to our knowledge, the ch5E1 Fab-Shh complex represents the first structure of an inhibitor antibody bound to a metalloprotease fold.
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Affiliation(s)
- Henry R Maun
- Department of Protein Engineering, Genentech, Inc., South San Francisco, California 94080, USA
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