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Lin JJY, Kuiper JR, Dickerson AS, Buckley JP, Volk HE, Rohlman DS, Lawrence KG, Braxton Jackson W, Sandler DP, Engel LS, Rule AM. Associations of a toenail metal mixture with attention and memory in the Gulf long-term follow-up (GuLF) study. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 935:173387. [PMID: 38788945 PMCID: PMC11170656 DOI: 10.1016/j.scitotenv.2024.173387] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/08/2024] [Revised: 03/31/2024] [Accepted: 05/18/2024] [Indexed: 05/26/2024]
Abstract
BACKGROUND Research on metal-associated neurodegeneration has largely focused on single metals. Since metal exposures typically co-occur as combinations of both toxic and essential elements, a mixtures framework is important for identifying risk and protective factors. This study examined associations between toenail levels of an eight-metal mixture and attention and memory in men living in US Gulf states. METHODS We measured toenail concentrations of toxic (arsenic, chromium, lead, and mercury) and essential (copper, manganese, selenium, and zinc) metals in 413 non-smoking men (23-69 years, 46 % Black) from the Gulf Long-Term Follow-Up (GuLF) Study. Sustained attention and working memory were assessed at the time of toenail sample collection using the continuous performance test (CPT) and digit span test (DST), respectively. Associations between toenail metal concentrations and performance on neurobehavioral tests were characterized using co-pollutant adjusted general linear models and Bayesian Kernel Machine Regression. RESULTS Adjusting for other metals, one interquartile range (IQR) increase in toenail chromium was associated with a 0.19 (95 % CI: -0.31, -0.07) point reduction in CPT D Prime score (poorer ability to discriminate test signals from noise). One IQR increase in toenail manganese was associated with a 0.20 (95 % CI, -0.41, 0.01) point reduction on the DST Reverse Count (fewer numbers recalled). Attention deficits were greater among Black participants compared to White participants for the same increase in toenail chromium concentrations. No evidence of synergistic interaction between metals or adverse effect of the overall metal mixture was observed for either outcome. CONCLUSIONS Our findings support existing studies of manganese-related memory deficits and are some of the first to show chromium related attention deficits in adults. Longitudinal study of cognitive decline is needed to verify chromium findings. Research into social and chemical co-exposures is also needed to explain racial differences in metal-associated neurobehavioral deficits observed in this study.
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Affiliation(s)
- Joyce J Y Lin
- Department of Environmental Health and Engineering, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA.
| | - Jordan R Kuiper
- Department of Environmental and Occupational Health, The George Washington University Milken Institute School of Public Health, Washington, DC, USA
| | - Aisha S Dickerson
- Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA
| | - Jessie P Buckley
- Department of Epidemiology, University of North Carolina Gillings School of Global Public Health, Chapel Hill, NC, USA
| | - Heather E Volk
- Department of Mental Health, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA
| | - Diane S Rohlman
- Department of Occupational and Environmental Health, University of Iowa College of Public Health, Iowa City, IA, USA
| | - Kaitlyn G Lawrence
- Epidemiology Branch, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, NC, USA
| | | | - Dale P Sandler
- Epidemiology Branch, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, NC, USA
| | - Lawrence S Engel
- Department of Epidemiology, University of North Carolina Gillings School of Global Public Health, Chapel Hill, NC, USA; Epidemiology Branch, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, NC, USA
| | - Ana M Rule
- Department of Environmental Health and Engineering, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA
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Kale R, Chaturvedi D, Dandekar P, Jain R. Analytical techniques for screening of cannabis and derivatives from human hair specimens. ANALYTICAL METHODS : ADVANCING METHODS AND APPLICATIONS 2024; 16:1133-1149. [PMID: 38314866 DOI: 10.1039/d3ay00786c] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/07/2024]
Abstract
Cannabis and associated substances are some of the most frequently abused drugs across the globe, mainly due to their anxiolytic and euphorigenic properties. Nowadays, the analysis of hair samples has been given high importance in forensic and analytical sciences and in clinical studies because they are associated with a low risk of infection, do not require complicated storage conditions, and offer a broad window of non-invasive detection. Analysis of hair samples is very easy compared to the analysis of blood, urine, and saliva samples. This review places particular emphasis on methodologies of analyzing hair samples containing cannabis, with a special focus on the preparation of samples for analysis, which involves screening and extraction techniques, followed by confirmatory assays. Through this manuscript, we have presented an overview of the available literature on the screening of cannabis using mass spectroscopy techniques. We have presented a detailed overview of the advantages and disadvantages of this technique, to establish it as a suitable method for the analysis of cannabis from hair samples.
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Affiliation(s)
- Rohit Kale
- Department of Biological Sciences and Biotechnology, Institute of Chemical Technology, Mumbai 400019, India.
| | - Deepa Chaturvedi
- Department of Pharmaceutical Sciences and Technology, Institute of Chemical Technology, Mumbai 400019, India.
| | - Prajakta Dandekar
- Department of Pharmaceutical Sciences and Technology, Institute of Chemical Technology, Mumbai 400019, India.
| | - Ratnesh Jain
- Department of Biological Sciences and Biotechnology, Institute of Chemical Technology, Mumbai 400019, India.
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Mierzyńska Z, Niemirska M, Zgonina K, Bieńkowski T, Hryniów K, Świder P, Pawlak K. Multi-Elemental Analysis of Hair and Fingernails Using Energy-Dispersive X-ray Fluorescence (ED XRF) Method Supported by Inductively Coupled Plasma Mass Spectrometry (ICP MS). Molecules 2024; 29:773. [PMID: 38398525 PMCID: PMC10892256 DOI: 10.3390/molecules29040773] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/29/2023] [Revised: 01/31/2024] [Accepted: 02/06/2024] [Indexed: 02/25/2024] Open
Abstract
This work compared the multi-element analysis of human hair and nails using inductively coupled plasma mass spectrometry (ICP MS) with an easy, fast, cheap, non-destructive method using energy-dispersive x-ray fluorescence (ED XRF). The ICP MS-based method was more sensitive (over 30 elements could be quantified) and costly (requiring more time, samples, and chemicals). The EDX-based method required laboratory and certified reference materials made of hair for instrument calibration. It was less sensitive (16 elements could be quantified: S, Si, Ca, Br, Fe, Cu, Cr, Mg, Si, K, Mn, Ni, Zn, Se, Sr, Pb), but it allowed us to replace troublesome grinding with the dissolution of keratin-based material with an alkalic agent (tetramethylammonium hydroxide, TMAH) and the formation of stable-for-days pellets. This method is simple, enables automation, and, due to the modification of wells in the autosampler of the EDX system via the immersion of home-designed inserts, it requires smaller amounts of biological material and binder (down to 70 mg instead of 500 mg required by commercially available instrument) to perform analysis. It was concluded that the EDX-based method offers complementary selectivity and sensitivity to ICP MS with the possibility of sample reuse for further analysis.
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Affiliation(s)
- Zofia Mierzyńska
- Masdiag, Żeromskiego 33, 01-882 Warsaw, Poland (T.B.); (K.H.); (P.Ś.)
| | - Maria Niemirska
- Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664 Warsaw, Poland
| | - Kacper Zgonina
- Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664 Warsaw, Poland
| | - Tomasz Bieńkowski
- Masdiag, Żeromskiego 33, 01-882 Warsaw, Poland (T.B.); (K.H.); (P.Ś.)
| | - Krzysztof Hryniów
- Masdiag, Żeromskiego 33, 01-882 Warsaw, Poland (T.B.); (K.H.); (P.Ś.)
- Institute of Control and Industrial Electronics, Faculty of Electrical Engineering, Warsaw University of Technology, Koszykowa 75, 00-662 Warsaw, Poland
| | - Paweł Świder
- Masdiag, Żeromskiego 33, 01-882 Warsaw, Poland (T.B.); (K.H.); (P.Ś.)
| | - Katarzyna Pawlak
- Masdiag, Żeromskiego 33, 01-882 Warsaw, Poland (T.B.); (K.H.); (P.Ś.)
- Faculty of Chemistry, Warsaw University of Technology, Noakowskiego 3, 00-664 Warsaw, Poland
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Christensen JR, LaBine GO, Cheung JS, Rosol R, Mohapatra AK, Laird B, Chan HM. Micro-distribution of arsenic in toenail clippings using laser ablation inductively coupled plasma mass spectrometry: implications for biomonitoring. ENVIRONMENTAL MONITORING AND ASSESSMENT 2024; 196:181. [PMID: 38246977 DOI: 10.1007/s10661-024-12360-4] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/11/2023] [Accepted: 01/15/2024] [Indexed: 01/23/2024]
Abstract
Toenails are a common monitoring tool for arsenic exposure, but the risk of external contamination of toenails has cast doubt on its usefulness. The main objective of this study is to investigate the micro-distribution of arsenic through the dorsoventral plane of nail clippings to understand endogenous vs exogenous sources. We used laser-ablation inductively coupled plasma mass spectrometry to measure arsenic through a dorsoventral cross-section of the nail plate collected from reference (N = 17) and exposed individuals (N = 35). Our main results showed (1) bulk toenail concentrations measured using ICP-MS in this study ranged from 0.54 to 4.35 µg/g; (2) there was a double-hump pattern in arsenic concentrations, i.e., dorsal and ventral layers had higher arsenic than the inner layer; (3) the double-hump was more pronounced in the exposed group (ventral: 6.25 μg/g; inner: 0.75 μg/g; dorsal: 0.95 μg/g) than the reference group (ventral: 0.58 μg/g; inner: 0.15 μg/g; dorsal: 0.29 μg/g) on average; (4) the distribution was, in part, associated with different binding affinity of nail layers (i.e., ventral > dorsal > inner); (5) most individuals in the higher exposure group showed > 25% contamination in ventral and dorsal nail layers; and (6) there were no statistically significant correlations between LA-ICP-MS arsenic with either bulk toenail arsenic or urine arsenic from the same individuals. Our results on micro-distribution and binding affinity provide insight into the impact of external contamination on arsenic concentrations and show how LA-ICP-MS can access the protected inner nail layer to provide a more accurate result.
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Affiliation(s)
| | - Geriene O LaBine
- TrichAnalytics Inc., 207-1753 Sean Heights, Saanichton, BC, V8M 0B3, Canada
| | - Janet S Cheung
- Department of Biology, University of Ottawa, Ottawa, ON, K1N 6N5, Canada
| | - Renata Rosol
- Department of Biology, University of Ottawa, Ottawa, ON, K1N 6N5, Canada
| | | | - Brian Laird
- School of Public Health and Health Systems, Faculty of Applied Health Sciences, University of Waterloo, Waterloo, ON, Canada
| | - Hing Man Chan
- Department of Biology, University of Ottawa, Ottawa, ON, K1N 6N5, Canada
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Haseen U, Ali SG, Khan RA, Alsalme A, Koo BH, Ahmad H. Preconcentration and selective extraction of trace Hg(ii) by polymeric g-C 3N 4 nanosheet-packed SPE column. RSC Adv 2024; 14:1593-1601. [PMID: 38179094 PMCID: PMC10765282 DOI: 10.1039/d3ra05512d] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/14/2023] [Accepted: 12/02/2023] [Indexed: 01/06/2024] Open
Abstract
In this study, we successfully synthesized polymeric graphitic carbon nitride (g-C3N4) nanosheets through thermal means and proposed their application in solid-phase extraction (SPE) for the enrichment of trace Hg(ii). The nanosheets underwent characterization using scanning electron microscopy, tunnelling electron microscopy, and energy-dispersive X-ray spectroscopy. The column packed with polymeric carbon nitride nanosheets demonstrated effective extraction of trace Hg(ii) ions from complex samples. The g-C3N4 nanosheets possess a zeta potential value of -20 mV, enabling strong interaction with positively charged divalent Hg(ii) ions. This interaction leads to the formation of stable chelates with the nitrogen atoms present in the polytriazine and heptazine units of the material. The proposed method exhibited a high preconcentration limit of 0.33 μg L-1, making it suitable for analysing trace amounts of Hg(ii) ions. Moreover, the method's applicability was confirmed through successful analysis of real samples, achieving an impressive preconcentration factor of 200. The detection limit for trace Hg(ii) ions was determined to be 0.6 μg L-1. To assess the accuracy of the method, we evaluated its performance by recovering spiked amounts of Hg(ii) and by analysing certified reference materials. The results indicated excellent precision, with RSD consistently below 5% for all the analyses conducted. In conclusion, the thermally synthesized polymeric carbon nitride nanosheets present a promising approach for solid-phase extraction and preconcentration of trace Hg(ii) from real samples. The method showcases high efficiency, sensitivity, and accuracy, making it a valuable tool for environmental and analytical applications.
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Affiliation(s)
- Uzma Haseen
- Department of Chemistry, Aligarh Muslim University Aligarh 202002 India
| | - Syed Ghazanfar Ali
- Department of Microbiology, Jawaharlal Nehru Medical College, Aligarh Muslim University Aligarh 202002 India
| | - Rais Ahmad Khan
- Department of Chemistry, College of Science, King Saud University Riyadh 11451 Saudi Arabia
| | - Ali Alsalme
- Department of Chemistry, College of Science, King Saud University Riyadh 11451 Saudi Arabia
| | - Bon Heun Koo
- School of Materials Science and Engineering, Changwon National University Changwon 51140 Gyeongnam South Korea
| | - Hilal Ahmad
- Faculty of Applied Sciences, Ton Duc Thang University Ho Chi Minh City 700000 Vietnam
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Lin JJY, Koffman LJ, Tehrani MW, Chen R, Han SG, Sandler DP, Lawrence KG, Jackson WB, Dickerson AS, Ramachandran G, Engel LS, Rule AM. Reliability of low mass toenail samples as biomarkers of chronic metal exposure. JOURNAL OF EXPOSURE SCIENCE & ENVIRONMENTAL EPIDEMIOLOGY 2023; 33:945-953. [PMID: 37296232 PMCID: PMC10709526 DOI: 10.1038/s41370-023-00560-y] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/15/2022] [Revised: 06/01/2023] [Accepted: 06/01/2023] [Indexed: 06/12/2023]
Abstract
BACKGROUND Toenails are a promising matrix for chronic metal exposure assessment, but there are currently no standard methods for collection and analysis. Questions remain about sample mass requirements and the extent to which metals measured in this matrix are representative of chronic body burden. OBJECTIVE This study proposes a method to maximize sample conservation for toenail metals analysis using inductively coupled plasma mass spectrometry (ICP-MS). We demonstrate the reliability of an ~25 mg toenail sample (typically 1-2 clippings) for metals analysis and evaluate the intra-individual variability of multiple metals in this matrix over time in men from the Gulf Long-term Follow-up (GuLF) Study. METHODS Toenail samples from 123 GuLF Study participants were collected at two visits 3 years apart and analyzed for 18 elements using ICP-MS. Participants with samples exceeding 200 mg at the first visit (n = 29) were selected for triplicate sub-sample analysis. Kendall's coefficient of concordance (W) was used to assess sub-sample reliability and Spearman's correlation coefficients (ρ) were used to evaluate fluctuations in elemental concentrations over time. RESULTS Results were not reported for Cd, Co, Mo, Sb, and V (detected in <60% of the samples). There was strong agreement among triplicate samples (Kendall's W: 0.72 (Cu)-0.90 (Cu)) across all elements evaluated, moderate correlations of elemental concentrations (Spearman's ρ: 0.21-0.42) over 3 years for As, Ca, Cr, Fe, Pb, Mn, and Zn, and strong correlations (>0.50) for Se, Cu, and Hg. IMPACT STATEMENT This toenail reliability study found that a low-mass (~25 mg) toenail sample (1-2 clippings) is suitable for the determination of most elements using ICP-MS and helps to increase the analytical capacity of limited toenail biospecimens collected in cohort studies. The results highlight differences in the suitability of toenails for chronic metal exposure assessment by element and underscore the need to consider intra-person variability, especially when comparing results across studies. We also provide recommendations for analytical standardization and the partitioning of the total collected toenail sample into multiple analytic sub-samples for future studies using toenail biospecimen for multiple assays.
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Affiliation(s)
- Joyce J Y Lin
- Department of Environmental Health and Engineering, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA.
| | - Lily J Koffman
- Department of Biostatistics, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA
| | - Mina W Tehrani
- Department of Environmental Health and Engineering, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA
| | - Rui Chen
- Department of Environmental Health and Engineering, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA
| | - Seok Gyu Han
- Department of Environmental Health and Engineering, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA
| | - Dale P Sandler
- Epidemiology Branch, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, NC, USA
| | - Kaitlyn G Lawrence
- Epidemiology Branch, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, NC, USA
| | | | - Aisha S Dickerson
- Department of Epidemiology, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA
| | - Gurumurthy Ramachandran
- Department of Environmental Health and Engineering, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA
| | - Lawrence S Engel
- Epidemiology Branch, National Institute of Environmental Health Sciences, National Institutes of Health, Research Triangle Park, NC, USA
- Department of Epidemiology, University of North Carolina Gillings School of Global Public Health, Chapel Hill, NC, USA
| | - Ana M Rule
- Department of Environmental Health and Engineering, Johns Hopkins Bloomberg School of Public Health, Baltimore, MD, USA
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Bertram J, Esser A, Thoröe-Boveleth S, Fohn N, Schettgen T, Kraus T. Quantification of 26 metals in human urine samples using ICP-MSMS in a random sample collective of an occupational and environmental health care center in Aachen, Germany. J Trace Elem Med Biol 2023; 78:127161. [PMID: 37001205 DOI: 10.1016/j.jtemb.2023.127161] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 11/29/2022] [Revised: 03/13/2023] [Accepted: 03/24/2023] [Indexed: 03/29/2023]
Abstract
Despite several studies on metal exposure in the general population, the knowledge on the background burden of distinct metals is still sparse (e.g. Cu, In, Mn, Pb, Sn, Sr, Ta, Te). While up to date reference values exist for 16 distinct metals as Biological Reference Value (BAR) or the 95th percentile for Al, As, Ba, Be, Cd, Co, Cr, Hg, Li, Mo, Ni, Pt, Sb, Se, Tl and U respectively, the background burden of the general population for the remaining elements is unknown or yet no matter of scientific counselling. We established and validated an inductively coupled plasma triple quadrupole mass spectrometry (ICP-MSMS) human biomonitoring method (HBM), that enabled us to determine 26 metals in urine. Al, As, Ba, Be, Cd, Co, Cu, Ga, Gd, Hg, In, Li, Mo, Ni, Pb, Sb, Se, Sn, Sr, Ta, Te, Tl, V and Zn were analyzed. The method was applied to 88 urine samples collected in the ambulance of the Institute for Occupational, Social and Environmental Medicine (IASU) Aachen, Germany. Patients from two major metal processing companies (steel and copper) and a more heterogenous group of occupational exposed and non-exposed persons were defined and distinguished. HBM data from about 88, in general occupationally unexposed persons against certain metals served as a collective representing the general population in first approximation. For these the 95th percentiles are reported. Significant differences of urinary metal concentrations of the employees of the two metal processing companies compared to the third group were observed among others for Cu, Cr, Ni, Mn and are discussed, thus demonstrating the usefulness of the method for both environmental and occupational purposes.
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Affiliation(s)
- Jens Bertram
- Institute for Occupational, Social and Environmental Medicine, Medical Faculty, RWTH Aachen University, Pauwelsstr. 30, D-52074 Aachen, Germany.
| | - André Esser
- Institute for Occupational, Social and Environmental Medicine, Medical Faculty, RWTH Aachen University, Pauwelsstr. 30, D-52074 Aachen, Germany
| | - Sven Thoröe-Boveleth
- Institute for Occupational, Social and Environmental Medicine, Medical Faculty, RWTH Aachen University, Pauwelsstr. 30, D-52074 Aachen, Germany
| | - Nina Fohn
- Institute for Occupational, Social and Environmental Medicine, Medical Faculty, RWTH Aachen University, Pauwelsstr. 30, D-52074 Aachen, Germany
| | - Thomas Schettgen
- Institute for Occupational, Social and Environmental Medicine, Medical Faculty, RWTH Aachen University, Pauwelsstr. 30, D-52074 Aachen, Germany
| | - Thomas Kraus
- Institute for Occupational, Social and Environmental Medicine, Medical Faculty, RWTH Aachen University, Pauwelsstr. 30, D-52074 Aachen, Germany
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8
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Fleming DEB, Kaiser MG, Rankin BD, Schenkels KMM. Assessment of X-ray fluorescence capabilities for nail and hair matrices through zinc measurement in keratin reference materials. J Trace Elem Med Biol 2023; 77:127136. [PMID: 36716562 DOI: 10.1016/j.jtemb.2023.127136] [Citation(s) in RCA: 3] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 08/25/2022] [Revised: 01/13/2023] [Accepted: 01/23/2023] [Indexed: 01/27/2023]
Abstract
BACKGROUND Novel and emerging biomarkers of zinc status are being developed to help study and address zinc deficiency around the world. Two potential biomarkers, nail and hair, involve the measurement of zinc from easily accessible keratin-based components of the body. Portable X-ray fluorescence (XRF) is a relatively new approach to the assessment of zinc in nail or hair, and has a number of compelling advantages compared with other techniques. The aim of the current study was to test the ability of XRF to measure zinc in keratinized reference materials (RMs) designed to simulate nail and hair. METHODS Four Keratin Matrix RMs were prepared and characterized for numerous trace elements by the New York State Department of Health's Wadsworth Center. The Keratin Matrix RMs consisted of powdered samples of caprine (goat) horns pooled from several animals. Concentrations of zinc, as assessed by inductively coupled plasma mass spectrometry (ICP-MS), were similar to what would be expected from human nail or hair tissues. Repeat measurements of the RMs were made using a portable XRF system. The XRF zinc results were compared with the ICP-MS zinc concentrations. Three different approaches to quantifying the zinc content by XRF were performed: (1) zinc signal to total signal ratio, (2) zinc signal to sulfur signal ratio, and (3) system output zinc concentration. RESULTS The portable XRF results from a given RM were found to be consistent across repeat trials under all three approaches to XRF quantitation. Precision, calculated as the relative standard deviation of repeat measurements ranged from an average result of 0.8 % (using the system output zinc concentration method) to 6.1 % (using the zinc signal to sulfur signal ratio method). Measurement of the RMs provided XRF zinc results which scaled well with ICP-MS zinc concentration, particularly when using the XRF zinc to total and system zinc concentration methods. A Bland-Altman plot showed that the XRF system zinc concentration output exceeded the ICP-MS zinc concentration by, on average, 10.2 % ± 1.2 %. CONCLUSION Overall, both accuracy and precision of measurement were found to be promising for portable XRF, provided appropriate conversions to concentration are introduced. The results of this study indicate that portable XRF is an effective and dependable method of assessing zinc concentration in keratinized tissue RMs. This will have implications for the future use of portable XRF to monitor zinc status in humans through measurements of nail and hair.
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Affiliation(s)
- David E B Fleming
- Physics Department, Mount Allison University, Sackville, New Brunswick, Canada.
| | - Michaela G Kaiser
- Physics Department, Mount Allison University, Sackville, New Brunswick, Canada
| | - Bryn D Rankin
- Physics Department, Mount Allison University, Sackville, New Brunswick, Canada
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Zhou J, Yan J, Qi X, Wang M, Yang M. Development of a new matrix-certified reference material for accurate measurement of PFOA and PFOS in oyster meat powder. Microchem J 2023. [DOI: 10.1016/j.microc.2023.108673] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 04/07/2023]
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10
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Yan J, Wang M, Zhou J, Fan X, Jia Z, Yang M, Zhao Y, Xi J, Wang T. New matrix certified reference materials for the measurement of trace elements in swine and chicken compound feed. Microchem J 2022. [DOI: 10.1016/j.microc.2021.107065] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022]
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Tehrani MW, Galusha AL, Kannan A, Parsons PJ. Lead uptake into calcified and keratinized compartments of horns from a convenience sample of lead-dosed goats. JOURNAL OF TOXICOLOGY AND ENVIRONMENTAL HEALTH. PART A 2021; 84:729-742. [PMID: 34167434 DOI: 10.1080/15287394.2021.1938766] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
Abstract
Hair and/or nail analyses are sometimes used in biomonitoring studies due to the convenience of sample collection, storage, and transport, as well as the potential to assess past exposures to toxic metals, such as lead (Pb). However, the validity of Pb measurements in these keratinized matrices as biomarkers of absorbed dose remains unclear. The aim of this study was to examine the uptake of Pb into horns harvested postmortem from 11 goats that received a cumulative oral dose of up to 151 g Pb acetate over a period of 1-11 years as part of a long-term blood Pb proficiency testing program. Uptake of Pb into keratinized horn was compared to the corresponding underlying bony horn core, which, as part of the bone compartment, provided a measure of absorbed Pb dose. Two complementary analytical techniques were used to assess Pb: X-Ray Fluorescence (XRF) and Inductively Coupled Plasma Mass Spectrometry (ICP-MS). Detectable amounts of Pb were found in all keratinized horn samples (0.45-6.6 µg/g) and in all but one bony core sample (1.4-68 µg/g). In both bony core and keratinized horn samples, Pb accumulation increased with dose over a low-to-moderate cumulative-dose interval, consistent with previous observations, but plateaued at higher doses. Significant associations were observed between Pb in keratinized horn and bony core samples particularly with XRF measurements, which represent the surface bone compartment. These findings provide evidence that Pb is excreted in keratinized tissues but reflects only a small fraction of the absorbed Pb dose, likely transferred from underlying bone tissue.
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Affiliation(s)
- Mina W Tehrani
- New York State Department of Health, Laboratory of Inorganic and Nuclear Chemistry, Wadsworth Center, Albany, NY USA
- Department of Environmental Health Sciences, University at Albany, Rensselaer, NY USA
- Department of Environmental Health and Engineering, Johns Hopkins University, Baltimore, MD USA
| | - Aubrey L Galusha
- New York State Department of Health, Laboratory of Inorganic and Nuclear Chemistry, Wadsworth Center, Albany, NY USA
- Department of Environmental Health Sciences, University at Albany, Rensselaer, NY USA
| | - Arnav Kannan
- New York State Department of Health, Laboratory of Inorganic and Nuclear Chemistry, Wadsworth Center, Albany, NY USA
| | - Patrick J Parsons
- New York State Department of Health, Laboratory of Inorganic and Nuclear Chemistry, Wadsworth Center, Albany, NY USA
- Department of Environmental Health Sciences, University at Albany, Rensselaer, NY USA
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12
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Fleming DEB, Crook SL, Evans CT, Nader MN, Atia M, Hicks JMT, Sweeney E, McFarlane CR, Kim JS, Keltie E, Adisesh A. Portable X-ray fluorescence of zinc applied to human toenail clippings. J Trace Elem Med Biol 2020; 62:126603. [PMID: 32623095 DOI: 10.1016/j.jtemb.2020.126603] [Citation(s) in RCA: 5] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 12/16/2019] [Revised: 04/28/2020] [Accepted: 06/25/2020] [Indexed: 11/29/2022]
Abstract
Zinc is an essential trace element in humans. Zinc deficiency can result in a range of serious medical conditions which include effects on growth and development, the immune system, the central nervous system, and the gastrointestinal system. Diagnosis of zinc deficiency is often precluded by the lack of a noninvasive and reliable biomarker. Zinc concentration in nail is considered an emerging biomarker of zinc status in humans. Whether zinc in nail accurately reflects zinc status is beyond the scope of the current study, but is an important research question. The development of a portable method to quickly assess zinc concentration from a single nail clipping could be a useful advance. In this study, single toenail clippings from 60 individuals living in Atlantic Canada were measured for zinc using a portable X-ray fluorescence (XRF) technique. These samples were obtained from the Atlantic PATH cohort, part of the largest chronic disease study ever performed in Canada. Each toenail clipping was measured using three 300 s trials with a mono-energetic portable XRF system. Results were then assessed using two different approaches to the XRF analysis: (1) factory-calibrated zinc concentrations were output from each trial, and (2) energy spectra were analyzed for the characteristic X-rays resulting from zinc. Following the measurement of zinc using the non-destructive portable XRF method, the same clippings were measured for zinc concentration using the "gold standard" technique of inductively coupled plasma-mass spectrometry (ICP-MS). A linear equation of best fit was determined for the relationship between average XRF output zinc concentration and ICP-MS zinc concentration, with a correlation coefficient r = 0.60. Similarly, a linear equation of best fit was found for the relationship between a normalized XRF energy spectrum zinc signal and ICP-MS zinc concentration, with a correlation coefficient r = 0.68. Individual ICP-MS zinc concentrations ranged from 32 μg/g to 140 μg/g, with a population average of 85 μg/g. The results of this study indicate that portable XRF is a sensitive method for the measurement of zinc in a single nail clipping, and provides a reasonable estimation of zinc concentration. Further method development is required before portable XRF be considered a routine alternative to ICP-MS for the assessment of zinc in nail clippings.
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Affiliation(s)
- David E B Fleming
- Physics Department, Mount Allison University, Sackville, New Brunswick, Canada.
| | - Samantha L Crook
- Physics Department, Mount Allison University, Sackville, New Brunswick, Canada
| | - Colby T Evans
- Physics Department, Mount Allison University, Sackville, New Brunswick, Canada
| | - Michel N Nader
- Physics Department, Mount Allison University, Sackville, New Brunswick, Canada
| | - Manuel Atia
- Medical Sciences, Dalhousie University, Halifax, Nova Scotia, Canada
| | - Jason M T Hicks
- Atlantic PATH, Dalhousie University, Halifax, Nova Scotia, Canada
| | - Ellen Sweeney
- Atlantic PATH, Dalhousie University, Halifax, Nova Scotia, Canada
| | | | - Jong Sung Kim
- Community Health and Epidemiology, Dalhousie University, Halifax, Nova Scotia, Canada
| | - Erin Keltie
- Community Health and Epidemiology, Dalhousie University, Halifax, Nova Scotia, Canada
| | - Anil Adisesh
- Atlantic PATH, Dalhousie University, Halifax, Nova Scotia, Canada; Department of Medicine, Division of Occupational Medicine, University of Toronto, Toronto, Ontario, Canada; Faculty of Business, University of New Brunswick, Saint John, New Brunswick, Canada
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