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Reeder MJ, Idrogo-Lam A, Aravamuthan SR, Warshaw EM, DeKoven JG, Silverberg JI, Adler BL, Atwater AR, Taylor JS, Houle MC, Belsito DV, Yu J, Botto N, Mowad CM, Dunnick CA, DeLeo VA, Pratt MD. Occupational Contact Dermatitis in Construction Workers: A Retrospective Analysis of the North American Contact Dermatitis Group Data, 2001-2020. Dermatitis 2024; 35:467-475. [PMID: 38888884 DOI: 10.1089/derm.2024.0018] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 06/20/2024]
Abstract
Background: Construction workers (CWs) are at risk for occupational contact dermatitis (CD) owing to workplace exposures. Objective: Determine the prevalence of occupational allergic CD and characterize common occupational allergens in CWs referred for patch testing in the United States and Canada. Methods: Retrospective cross-sectional analysis of patients patch tested by the North American Contact Dermatitis Group from 2001 to 2020. Results: Of 47,843 patch-tested patients, 681 (1.4%) were CWs. Compared with non-CWs, CWs were more likely to be male (91.0% vs 30.9%) have occupational skin disease (36.9% vs 11.4%) and have hand involvement (37.2% vs 22.5%) (all P < 0.0001). Of 681 CWs, 60.1% (411) had clinically relevant positive patch test reactions, and nearly 1/3 of CWs (128) had occupationally relevant reactions. Most common occupationally relevant allergens were potassium dichromate 0.25% pet. (30.5%, 39/128), bisphenol A epoxy resin 1% pet. (28.1%, 36/128), carba mix 3% pet. (14.8%, 19/128), cobalt (ii) chloride hexahydrate 1% pet. (14.1%, 18/128), and thiuram mix 1% pet. (14.1%, 18/128). Top sources of occupationally relevant allergens were cement/concrete/mortar (20.4%, 46/225), gloves (15.1%, 34/225), and coatings (paint/lacquer/shellac/varnish/stains) (9.8%, 22/225). Conclusions: Occupational CD in North American CWs is common. In this group, frequently identified etiological sources of occupational allergic CD included metals, epoxy resin, and rubber.
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Affiliation(s)
- Margo J Reeder
- From the *Department of Dermatology, School of Medicine and Public Health, University of Wisconsin, Madison, Wisconsin, USA
| | - Alexander Idrogo-Lam
- University of Wisconsin School of Medicine and Public Health, Madison, Wisconsin, USA
| | - Srikanth R Aravamuthan
- From the *Department of Dermatology, School of Medicine and Public Health, University of Wisconsin, Madison, Wisconsin, USA
| | - Erin M Warshaw
- Department of Dermatology, Park Nicollet Health Services, Minneapolis, Minnesota, USA
- Department of Dermatology, Minneapolis Veterans Affairs Medical Center, Minneapolis, Minnesota, USA
- Department of Dermatology, University of Minnesota, Minneapolis, Minnesota, USA
| | - Joel G DeKoven
- Division of Dermatology, Sunnybrook Health Sciences Centre, University of Toronto, Ontario, Canada
| | - Jonathan I Silverberg
- Department of Dermatology, The George Washington University School of Medicine and Health Sciences, Washington, District of Columbia, USA
| | - Brandon L Adler
- Department of Dermatology, Keck School of Medicine, University of Southern California, Los Angeles, California, USA
| | - Amber R Atwater
- Department of Dermatology, Duke University Medical Center, Durham, North Carolina, USA
| | - James S Taylor
- Department of Dermatology, Cleveland Clinic, Cleveland, Ohio, USA
| | - Marie-Claude Houle
- Division of Dermatology, CHU de Quebec, Laval University, Quebec City, Canada
| | - Donald V Belsito
- Department of Dermatology, Columbia University Irving Medical School, New York, New York, USA
| | - Jiade Yu
- Department of Dermatology, Massachusetts General Hospital, Harvard Medical School, Boston, Massachusetts, USA
| | - Nina Botto
- Department of Dermatology, University of California, San Francisco, California, USA
| | - Christen M Mowad
- Department of Dermatology, Geisinger Medical Center, Danville, Pennsylvania, USA
| | - Cory A Dunnick
- Department of Dermatology, University of Colorado Anschutz Medical Campus, Aurora, Colorado, USA
- Rocky Mountain Regional Veterans Affairs Medical Center, Aurora, Colorado, USA
| | - Vincent A DeLeo
- Department of Dermatology, Keck School of Medicine, University of Southern California, Los Angeles, California, USA
| | - Melanie D Pratt
- Division of Dermatology, University of Ottawa, Ontario, Canada
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Pei Y, Ren J, Zhang H, Liu QS, Hou X, Zhou Q, Jiang G. Screening Allergenic Potencies of Skin-Contact Products Using the Human-Derived THP-1 Cell Activation Test. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2024; 58:291-301. [PMID: 38126320 DOI: 10.1021/acs.est.3c08237] [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: 12/23/2023]
Abstract
With the prevalence of allergic contact dermatitis (ACD) from the usage of skin-contact products, like wearable, skin care, and hair care products, screening their skin sensitizing potential is necessary, for the sake of alleviating the consequent public health impact. In the present study, a total of 77 skin-contact products classified by four categories, watch bands (WBs), skin care products (SCPs), hair care products (HCPs), and rubber gloves (RGs), were investigated, using an optimized in vitro assay of human cell line activation test (h-CLAT). Extracting the products using neutral artificial sweat simulated well the practical usage scenarios, and testing the extracts showed that 26 of them were allergy test positive, including nine WBs, six SCPs, two HCPs, and nine RGs. The allergenic response was mainly characterized by the induction of CD54 expression, and diverse paradigms of CD54 and CD86 levels were observed by analyzing dose-response curves, which could also be influenced by the compromised viability of the THP-1 cells. The data implicated the intricate regulation by different contributors to suspicious ingredients in the test samples. Altogether, a promising methodology for testing skin allergy potential was well established for commonly used commodities by neutral artificial sweat extraction coupled with h-CLAT screening. The findings would be of great help in tracing the potential allergens in practical products and improving their qualities.
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Affiliation(s)
- Yao Pei
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Jing Ren
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Hongrui Zhang
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China
| | - Qian S Liu
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Xingwang Hou
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Qunfang Zhou
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China
- Institute of Environment and Health, Jianghan University, Wuhan430056, China
| | - Guibin Jiang
- State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
- College of Resources and Environment, University of Chinese Academy of Sciences, Beijing 100049, China
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3
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Na J, Li N, Yan L, Schikowski T, Ye R, Krutmann J, Li Z. Skin aging associated with chromium among rural housewives in northern China. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2023; 253:114676. [PMID: 36827897 DOI: 10.1016/j.ecoenv.2023.114676] [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: 05/08/2022] [Revised: 01/24/2023] [Accepted: 02/20/2023] [Indexed: 06/18/2023]
Abstract
Previous studies have found associations between chromium exposure and skin damage. However, few studies have focused on both chromium and skin aging. This study aimed to assess the degree of skin aging symptoms and estimate the relationship between hair chromium and skin aging among rural housewives. We recruited 405 subjects in Shanxi Province of northern China and analyzed 397 eligible hair samples with inductively coupled plasma-mass spectrometry (ICP-MS). The subjects' skin aging symptoms were assessed with SCINEXA™ (SCore of INtrinsic and EXtrinsic skin Aging). After adjusting for age and other important covariates, the regression results showed more severe skin aging symptoms in women with a higher level of hair chromium and presented an increasing linear trend. Vegetables, fruits, and beans might be a source of chromium exposure. We concluded that skin aging might be positively associated with hair chromium. It is necessary to take measures to reduce chromium exposure to prevent skin aging.
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Affiliation(s)
- Jigen Na
- Key Laboratory of Reproductive Health, National Health Commission of the People's Republic of China, Institute of Reproductive and Child Health, Peking University, Beijing 100191, China; Department of Epidemiology and Biostatistics, School of Public Health, Peking University, Beijing 100191, China
| | - Nan Li
- Key Laboratory of Reproductive Health, National Health Commission of the People's Republic of China, Institute of Reproductive and Child Health, Peking University, Beijing 100191, China; Department of Epidemiology and Biostatistics, School of Public Health, Peking University, Beijing 100191, China.
| | - Lailai Yan
- Department of Laboratorial Science and Technology, School of Public Health, Peking University, Beijing 100191, China
| | - Tamara Schikowski
- IUF-Leibniz Research Institute for Environmental Medicine, Düsseldorf, Germany; Swiss Tropical Institute of Public Health, Basel, Switzerland; University of Basel, Basel, Switzerland
| | - Rongwei Ye
- Key Laboratory of Reproductive Health, National Health Commission of the People's Republic of China, Institute of Reproductive and Child Health, Peking University, Beijing 100191, China; Department of Epidemiology and Biostatistics, School of Public Health, Peking University, Beijing 100191, China
| | - Jean Krutmann
- IUF-Leibniz Research Institute for Environmental Medicine, Düsseldorf, Germany
| | - Zhiwen Li
- Key Laboratory of Reproductive Health, National Health Commission of the People's Republic of China, Institute of Reproductive and Child Health, Peking University, Beijing 100191, China; Department of Epidemiology and Biostatistics, School of Public Health, Peking University, Beijing 100191, China.
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Xiao Y, Zhou J, Wang C, Zhang J, Radnaeva VD, Lin W. Sustainable metal-free leather manufacture via synergistic effects of triazine derivative and vegetable tannins. JOURNAL OF LEATHER SCIENCE AND ENGINEERING 2023. [DOI: 10.1186/s42825-022-00108-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/06/2023]
Abstract
AbstractRestrictions on heavy metals, especially chromium, have encouraged alternative tanning systems that can reduce environmental and human health risks from conventional chrome-based tanning. In this work, metal-free combination tanning was developed by using vegetable tannins and a triazine-based syntan containing active chlorine groups (SACC). Specifically, the relationship between leather performance (e.g., hydrothermal stability and organoleptic properties) and technical protocols (e.g., types and dose of tannins) was systematically established. The optimized protocol involving a unique procedure (i.e., 10% SACC pre-tanning, shaving, and 25% wattle tanning) endowed the leather with high shrinkage temperature (~ 92 °C) and met the Chinese standards for shoe upper leather (QB/T 1873-2010). Our method not only produces zero chrome-containing solid wastes, but also uses ~ 75% less tannin for leather manufacture. The excellent leather performance was ascribed to the synergistic effects, where SACC and wattle diffused into collagen fibrils and may bind to collagen via covalent, hydrogen and ionic bonding, locking the hierarchical structure of collagen from microfibrils to fiber bundles. Moreover, we summarized these findings and proposed a diffusion-binding-locking mechanism, providing new insights for current tanning theory. Together with the biodegradable spent tanning liquor, this approach will underpin the development of sustainable leather manufacture.
Graphical Abstract
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Wang Y, Wang L, Wang X, Cheng G, Xing Y, Zhang M, Zhang P, Liu J. Inflammatory Injury and Mitophagy in the Cock Heart Induced by the Oral Administration of Hexavalent Chromium. Biol Trace Elem Res 2022; 200:1312-1320. [PMID: 33851329 DOI: 10.1007/s12011-021-02715-0] [Citation(s) in RCA: 5] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/14/2021] [Accepted: 04/07/2021] [Indexed: 10/21/2022]
Abstract
As a highly toxic heavy metal, chromium has caused a certain threat to public health and livestock breeding in recent years. In poultry, as one of our most commonly consumed meat product, its health issues will seriously threaten the safety of human life. As previous studies have confirmed, when cells are stimulated by the external environment, mitochondria, as an organelle that provides energy to the cells, can cause damage and autophagy. The purpose of this study is to confirm whether Cr(VI) can cause mitophagy in cock heart. We first randomly divided 32 cocks into four groups to explore the mechanism of this effect. The cocks were then separately exposed to four different dose levels, namely, the control level and 10, 30, and 50 mg/kg levels, via daily oral intake into the body through mixed feeding for 45 days. After 45 days, we sampled and detected pathological changes and the levels of inflammatory factors (IL-6, TNF-α, and IFN-γ), mitochondrial membrane potential (MMP), adenosine triphosphatases (ATPases), and mitophagy-related proteins (LC3, p62/SQTM1, TOMM20, and Parkin). We found that IL-6, TNF-α, IFN-γ, and LC3II contents increased with the increase in Cr(VI) concentration. However, MMP, ATPases, p62/SQTM1, and TOMM20 levels decreased with the increase in Cr(VI) concentration. At the same time, Cr(VI) exposure caused heart tissue damages and Parkin translocation. In conclusion, our results proved that inflammatory damage, mitochondrial function damage, and mitophagy in cock heart tissues were dependent on Cr(VI) concentration.
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Affiliation(s)
- Yue Wang
- College of Veterinary Medicine, China Agricultural University, Beijing, 100193, People's Republic of China
| | - Lumei Wang
- College of Veterinary Medicine, Shandong Agricultural University, Tai'an, 271018, Shandong, China
| | - Xiaozhou Wang
- College of Veterinary Medicine, Shandong Agricultural University, Tai'an, 271018, Shandong, China
| | - Guodong Cheng
- College of Veterinary Medicine, Shandong Agricultural University, Tai'an, 271018, Shandong, China
| | - Yuxiao Xing
- College of Veterinary Medicine, Shandong Agricultural University, Tai'an, 271018, Shandong, China
| | - Meihua Zhang
- College of Veterinary Medicine, Shandong Agricultural University, Tai'an, 271018, Shandong, China
| | - Pu Zhang
- Central Hospital of Tai'an City, Tai'an, 271018, Shandong, China.
| | - Jianzhu Liu
- College of Veterinary Medicine, Shandong Agricultural University, Tai'an, 271018, Shandong, China.
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Indium sulfide deposited MIL-53(Fe) microrods: Efficient visible-light-driven photocatalytic reduction of hexavalent chromium. J Colloid Interface Sci 2022; 606:1299-1310. [PMID: 34492467 DOI: 10.1016/j.jcis.2021.08.111] [Citation(s) in RCA: 13] [Impact Index Per Article: 6.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/17/2021] [Revised: 08/08/2021] [Accepted: 08/16/2021] [Indexed: 12/30/2022]
Abstract
The ecosystems and human health were seriously threatened by hexavalent chromium (Cr(VI)) in wastewater. In this article, using the idea of the highly matched energy band structure between indium sulfide (In2S3) and MIL-53(Fe), a Type-II heterojunction has been constructed by loading In2S3 on MIL-53(Fe) microrod to overcome the fault like high recombination rates of photogenerated electron-holes of In2S3. The composite with 20:1 mass ratio of In2S3 to MIL-53(Fe) (IM-2) was adopted as an optimal sample for efficient photocatalytic Cr(VI) reduction under visible light. Various characterization techniques were used to verify the characteristics of composites and delved into the structure-effect relationship between this heterojunction and its activity. Results showed that the reaction rate constants of the photoreduction process over IM-2 was ~ 4 and 26 times higher than those of pure In2S3 and MIL-53(Fe), respectively, and the catalyst could maintain superior removal efficiency (88.6%) and steady crystal structure after four cycles. First-principles calculations further illustrated that the heterostructure formed between In2S3 and MIL-53(Fe) could effectively accelerate the separation of photogenerated electrons and holes, thus improving the photocatalytic reduction performance. Moreover, the active species analyses revealed that the superoxide radicals and electrons were mainly involved in the reduction of Cr(VI).
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The Evaluation of the Detection of Cr(VI) in Leather. ANALYTICA 2021. [DOI: 10.3390/analytica3010001] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
The topic of hexavalent chromium (Cr(VI)) in leather has been debated throughout the whole supply chain for years. However, its significance has recently increased due to proposed changes in European legislation concerned with skin-sensitising substances suggesting that acceptable Cr(VI) concentrations in leather goods should be lowered from 3 mg kg−1 to 1 mg kg−1. The proposition of a stricter limit and current analytical difficulties created the need for a review of current standard test methods. The research presented in this paper investigates both the colorimetric (Part 1) and chromatographic (Part 2) methods under BS EN ISO 17075. The focus of the study was to identify possible sources of interference leading to large statistical variance in results and to define the limit of quantification with respect to the proposed new compliance limit. This study into the colorimetric method has shown that the presence of Cr(III), dyes, and proteins can be significant interferences, becoming critical at low Cr(VI) concentrations. Dilution factors worsen the problem of detecting low concentrations: a reliable quantitative detection of 0.01 mg kg−1 and 0.003 mg kg−1 Cr(VI) in solution are required at the 3 mg kg−1 and 1 mg kg−1 compliance limits in leather, respectively. BS EN ISO 17075 part 1 was shown to be incapable of reliably resolving to 3 mg kg−1 or below in leather. Part 2 shows a marked improvement in detection limits and reliability; however, data suggest that 1 mg kg−1 Cr(VI) is not reliably detectable in leather. Suggested improvements to the established test methods and a possible alternative are discussed.
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The Value of Patch Testing With Shoe Material Samples in Patients Suspected of Shoe Allergic Contact Dermatitis. Dermatitis 2021; 33:116-121. [PMID: 34570734 DOI: 10.1097/der.0000000000000790] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022]
Abstract
BACKGROUND Patch testing is the standard diagnostic tool for shoe allergic contact dermatitis (ACD). As shoe materials change over time, utilizing commercial allergen series might be ineffective. However, because testing with patients' shoe samples is laborious, its value is questioned. OBJECTIVE The aim of this study was to ascertain the benefits of patch testing with patients' shoes by comparing the frequencies of patch-test positivity of shoes and shoe-related allergens in baseline series for suspected shoe ACD patients. METHODS A retrospective study was conducted of patients with clinically suspected shoe ACD who underwent patch testing with baseline series and shoe samples 2000 to 2019. RESULTS Almost half of the cohort (77 of 178; 43.3%) was diagnosed with shoe ACD. Of those 77, 48 (62.3%) were positive to shoe-related allergens from the baseline series, whereas 53 (68.8%) were positive to their shoe materials. The prevalence of tests positive to shoe material but negative to shoe-related allergens was 29 of 77 (37.7%). The most common shoe-related allergens were potassium dichromate (7.9%), carba mix (6.8%), and mercapto mix (6.7%). CONCLUSIONS Patch testing with shoe materials increased the diagnostic yield by 37.7 percent. To diagnose shoe ACD, testing of shoe materials may compensate for unknown, scarce, or novel allergens not in the baseline series.
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Goossens A, Taylor JS. Contact Allergy to Shoes. Contact Dermatitis 2021. [DOI: 10.1007/978-3-030-36335-2_41] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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10
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Covington AD, Wise WR. Current trends in leather science. JOURNAL OF LEATHER SCIENCE AND ENGINEERING 2020. [DOI: 10.1186/s42825-020-00041-0] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/27/2023]
Abstract
AbstractIn preparing the second edition of ‘Tanning Chemistry. The Science of Leather.’, the literature was updated and the content was revised and reviewed. Here, the new findings are presented and discussed.Notable developments include the necessary rethinking of the mechanism of sulfide unhairing because of new understanding of the aqueous chemistry of sulfide species. Revision upwards of the value of the second pKa for sulfide species ionisation means that S2−cannot exist in an aqueous medium, so the unhairing species in hair burn reactions is HS−. Although the technology remains the same, this means the mechanisms of associated reactions such as immunisation must be revised.Rawstock preservation has benefitted from studies of the potential role of materials from plants which accumulate salt, but which also contribute terpene compounds. There is also further discussion on the continuing issue of chromium (VI) in the leather industry.The application to processing of new solvents, ionic liquids and deep eutectics, is the coming technology, which offers transforming options for new chemistries and products. Renewed interest in vegetable tanning and methods of wet white processing are current trends. Also, within the topic of reagent delivery is processing in a solid medium of plastic beads.Graphical abstract
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Badillo-Camacho J, Orozco-Guareño E, Carbajal-Arizaga GG, Manríquez-Gonzalez R, Barcelo-Quintal ID, Gomez-Salazar S. Cr(VI) adsorption from aqueous streams on eggshell membranes of different birds used as biosorbents. ADSORPT SCI TECHNOL 2020. [DOI: 10.1177/0263617420956893] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/16/2022] Open
Abstract
The discharges enriched with heavy metals, particularly Cr(VI), are a serious environmental problem. In this work, it is presented the use of biosorbents from eggshells membranes of ostrich, quail, duck and chicken; the membranes were easily prepared and studied for the removal of Cr(VI) from aqueous solutions. Maximum uptake of 1.41 mmol g−1 membrane permitted the identification of ostrich membrane as the material with the highest Cr(VI) uptake. N2 adsorption experiments permitted to classify ostrich membranes as mesoporous materials, since they had pore size of 14.8 nm. This represented an advantage on the nature of these membranes to be used as biosorbents with respect to other membranes. The adsorption isotherm models such as Langmuir and Freundlich were verified using experimental data. Langmuir model described the adsorption process satisfactorily at pH 1 and 2 whereas Freundlich model fitted data better at pH 3 and 5. The adsorption kinetic data were adjusted to a pseudo-second order kinetic model. TGA results permitted demonstrating a low thermal stability of ostrich membrane, since it starts decomposing at around 50°C due to the fact that membranes have about 60% protein. Through SEM microscopy was possible to observe the morphology of the membrane surfaces before and after Cr(VI) uptake which reflects the textural characteristics of the biosorbent. FTIR and XPS analyses suggested that Cr was adsorbed on ostrich membranes through the amine groups of proteins conforming the fibers of membranes. Despite the oxygen shows higher electronegativity than N, Cr shows more preference toward N due to fact that pH conditions favor the positive charges on the surface of the membrane. Our results make evident that this waste material is a novel and efficient option for the removal of Cr(VI) from aqueous solutions.
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Affiliation(s)
| | | | - Gregorio G Carbajal-Arizaga
- Departamento de Química, Universidad de Guadalajara-Centro, Universitario de Ciencias Exactas e Ingenierías, Jalisco, México
| | | | | | - Sergio Gomez-Salazar
- Departamento de Ingeniería Química, Universidad de Guadalajara-Centro, Universitario de Ciencias Exactas e Ingenierías, Jalisco, México
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TiO2@lipophilic Porphyrin Composites: New Insights into Tuning the Photoreduction of Cr(VI) to Cr(III) in Aqueous Phase. JOURNAL OF COMPOSITES SCIENCE 2020. [DOI: 10.3390/jcs4020082] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Metal-free and Cu(II)-lipophilic porphyrins [H2Pp and Cu(II)Pp] loaded on titanium dioxide in the anatase phase (TiO2) were prepared and used as a heterogeneous catalyst for the photoreduction of Cr(VI) to Cr(III) in aqueous suspensions under UV–Vis light irradiation. TiO2 impregnated with copper(II) porphyrin [TiO2@Cu(II)Pp] was the most effective in photocatalyst reduction of toxic chromate Cr(VI) to non-toxic chromium Cr(III). We further evaluated an experimental design with the scope of fast optimization of the process conditions related to the use of TiO2 or TiO2-porphyrin based photocatalysts. A full factorial design as a chemometric tool was successfully employed for screening the affecting factors involved in photoconversion catalysis, with the modification of TiO2 both with porphyrin H2Pp and Cu(II)Pp. The studied experimental factors were the catalyst amount, the concentration of Cr(VI) ions, and the pH of the medium. The performed multivariate approach was successfully used for fast fitting and better evaluation of significant factors affecting the experimental responses, with the advantage of reducing the number of available experiments. Thus, the stability of the optimized TiO2 embedded Cu(II)Pp was investigated, confirming the high reproducibility and suitability for environmental purposes.
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13
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Goossens A, Taylor JS. Contact Allergy to Shoes. Contact Dermatitis 2020. [DOI: 10.1007/978-3-319-72451-5_41-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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14
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Fontaine M, Clement Y, Blanc N, Demesmay C. Hexavalent chromium release from leather over time natural ageing vs accelerated ageing according to a multivariate approach. JOURNAL OF HAZARDOUS MATERIALS 2019; 368:811-818. [PMID: 30743228 DOI: 10.1016/j.jhazmat.2018.12.112] [Citation(s) in RCA: 17] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/03/2018] [Revised: 12/28/2018] [Accepted: 12/29/2018] [Indexed: 06/09/2023]
Abstract
European restriction limits the hexavalent chromium content to not more than 3 mg/kg in leather products. Owing to the evolution of hexavalent chromium content in leathers over time, it's difficult to guarantee the products will be harmless for consumers. The designing of an accelerated and representative artificial ageing procedure is therefore highly desirable. This article proposes a thorough study of the influence of storage conditions on the formation of hexavalent chromium in 4 bovine leathers. A factorial design of experiment was built with the following factors: temperature of 40-80 °C, relative humidity of 20-50%, presence or not of UV and exposure duration of 24-48 h. The results of these artificial ageings demonstrate that a high temperature, a dry atmosphere and the presence of light favor the formation of hexavalent chromium and that synergistic effects operate between temperature/humidity, temperature/UV and humidity/UV. At the same time, the leathers were subjected to a natural ageing for 12 months with a weekly hexavalent chromium analysis. The principal component analysis of the artificial ageing tests combined with the natural ageing tests, show that the artificial ageings 40 °C-50%RH-UV-48 h and 40 °C-20%RH-UV-24 h best simulate a natural ageing in the tannery, whatever the leather studied.
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Affiliation(s)
- Mathilde Fontaine
- CTC, Comité professionnel de Développement Economique, Cuir, Chaussure, Maroquinerie, Ganterie, 4 Rue Hermann Frenkel, 69007 Lyon, France.
| | - Yohann Clement
- Université Claude Bernard Lyon 1, CNRS, Institut des Sciences Analytiques, UMR 5280, 5 Rue de la Doua, 69100 Villeurbanne, France
| | - Nicolas Blanc
- CTC, Comité professionnel de Développement Economique, Cuir, Chaussure, Maroquinerie, Ganterie, 4 Rue Hermann Frenkel, 69007 Lyon, France
| | - Claire Demesmay
- Université Claude Bernard Lyon 1, CNRS, Institut des Sciences Analytiques, UMR 5280, 5 Rue de la Doua, 69100 Villeurbanne, France
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Shehzad MT, Murtaza G, Shafeeque M, Sabir M, Nawaz H, Khan MJ. Assessment of trace elements in urban topsoils of Rawalpindi-Pakistan: a principal component analysis approach. ENVIRONMENTAL MONITORING AND ASSESSMENT 2019; 191:65. [PMID: 30635736 DOI: 10.1007/s10661-019-7212-y] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/09/2018] [Accepted: 01/04/2019] [Indexed: 06/09/2023]
Abstract
Assessment of trace elements is inevitable to reduce stress on environment due to urbanization and industrialization. Rawalpindi, the fourth largest city of Pakistan, rapidly moving towards industrialization and has a large number of automobiles. In the present study, the urban area of Rawalpindi was divided into five parts: Gawal Mandi, Pir Wadhai, Soan Adda, Chah Sultan, and Central Ordinance Depot (COD), to determine distribution of trace elements. Soil samples were collected from 5 to 20 cm depth. After drying and sieving, samples were digested using di-acid (HNO3 and HClO4 at 2:1). Concentrations of heavy metals were determined using atomic absorption spectrophotometer (AAS). Principal component analysis (PCA) was performed to reduce multidimensional space of variables and samples. Observed mean concentrations of Cd, Co, Cr, Cu, Mn, Ni, Pb, and Zn were 164, 33.4, 295, 336, 634, 236, 1572, and 546 mg kg-1, respectively. Mean concentrations of all the heavy metals in urban area soil were higher than the WHO permissible limits. Correlation coefficient analysis showed positive correlation among Cd, Co, Cu, Ni, and Pb, whereas no obvious correlation for Cr and Mn was found with any other heavy metal. Zn was positively correlated with Co, Ni, and Mn, whereas negative correlation was found with Cr. Results showed that Pir Wadhai and COD were the most and least contaminated parts of the city, respectively, and this is attributed to the presence and absence of heavy traffic loads and industrial effluents. Graphical abstract ᅟ.
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Affiliation(s)
- Muhammad Tahir Shehzad
- Global Center for Environmental Remediation, The University of Newcastle, Callaghan, 2308, Australia.
- Institute of Soil and Environmental Sciences, University of Agriculture Faisalabad, Faisalabad, 38040, Pakistan.
| | - Ghulam Murtaza
- Institute of Soil and Environmental Sciences, University of Agriculture Faisalabad, Faisalabad, 38040, Pakistan
| | - Muhammad Shafeeque
- Institute of Geographical Sciences and Natural Resources Research, University of Chinese Academy of Sciences, Beijing, 100049, China
| | - Muhammad Sabir
- Institute of Soil and Environmental Sciences, University of Agriculture Faisalabad, Faisalabad, 38040, Pakistan
| | - Haq Nawaz
- Institute of Soil and Environmental Sciences, University of Agriculture Faisalabad, Faisalabad, 38040, Pakistan
| | - Muhammad Jamal Khan
- Faculty of Veterinary and Agricultural Sciences, The University of Melbourne, Melbourne, 3010, Australia
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Shoes. Contact Dermatitis 2019. [DOI: 10.1007/978-3-319-72451-5_41-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/19/2023]
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Ding W, Yi Y, Wang Y, Zhou J, Shi B. Preparation of a Highly Effective Organic Tanning Agent with Wide Molecular Weight Distribution from Bio‐Renewable Sodium Alginate. ChemistrySelect 2018. [DOI: 10.1002/slct.201802540] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/22/2023]
Affiliation(s)
- Wei Ding
- National Engineering Laboratory for Clean Technology of Leather ManufactureSichuan University Chengdu 610065 P.R. China
- Guangdong Dymatic Fine Chemicals Inc., Foshan 528305 P. R. China
| | - Yudan Yi
- National Engineering Laboratory for Clean Technology of Leather ManufactureSichuan University Chengdu 610065 P.R. China
| | - Ya‐nan Wang
- National Engineering Laboratory for Clean Technology of Leather ManufactureSichuan University Chengdu 610065 P.R. China
| | - Jianfei Zhou
- National Engineering Laboratory for Clean Technology of Leather ManufactureSichuan University Chengdu 610065 P.R. China
| | - Bi Shi
- National Engineering Laboratory for Clean Technology of Leather ManufactureSichuan University Chengdu 610065 P.R. China
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Lazzarini R, Mendonça RF, Hafner MDFS. Allergic contact dermatitis to shoes: contribution of a specific series to the diagnosis. An Bras Dermatol 2018; 93:696-700. [PMID: 30156619 PMCID: PMC6106660 DOI: 10.1590/abd1806-4841.20187370] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/19/2017] [Accepted: 07/25/2017] [Indexed: 11/22/2022] Open
Abstract
BACKGROUND In our country, the Brazilian Standard Series is the most used for the etiological diagnosis of allergic contact dermatitis to shoes. However, there is no assessment of the usefulness of specific allergens for shoes. OBJECTIVES To measure the improvement in diagnostic accuracy of allergic contact dermatitis to shoes with the use of a specific complementary series in patch testing and describe the characteristics of the affected population, such as gender, location of lesions, time of evolution, and the most common allergens. METHODS This retrospective study evaluated the results of 52 patients with suspected shoe dermatitis subjected to patch tests with the standard and specific series to quantify the gain in diagnostic accuracy. RESULTS Among the 52 suspected cases, 29 cases (56%) were confirmed. In 13 (45%) cases the diagnosis was determined through the specific series, which results in an 81% increase in the number of diagnoses. STUDY LIMITATION Small sample size. CONCLUSIONS Women were more commonly affected, with a mean time for the final diagnosis of 45 months, and the most common localization was the dorsum of the feet. There was an increase in diagnostic accuracy with the introduction of new haptens in the patch test of patients with suspected shoes dermatitis.
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Affiliation(s)
- Rosana Lazzarini
- Dermatology Clinic, Santa Casa de São Paulo - São
Paulo (SP), Brazil
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Bregnbak D, Thyssen JP, Jellesen MS, Zachariae C, Johansen JD. Experimental patch testing with chromium-coated materials. Contact Dermatitis 2017; 76:333-341. [PMID: 28120332 DOI: 10.1111/cod.12747] [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: 09/20/2016] [Revised: 11/17/2016] [Accepted: 11/20/2016] [Indexed: 11/27/2022]
Abstract
BACKGROUND Chromium coatings on metal alloys can be decorative, and prevent corrosion and metal ion release. We recently showed that handling of a chromium-containing disc resulted in chromium deposition on the skin. OBJECTIVES To examine patch test reactivity to chromium-coated discs. METHODS We included 15 patients: 10 chromium-allergic patients, and 5 patients without chromium allergy. All were patch tested with potassium dichromate, cobalt chloride, nickel sulfate, and nine different metallic discs. The chromium-allergic patients were also patch tested with serial dilutions of potassium dichromate. RESULTS Positive/weaker reactions were observed to disc B (1 of 10), disc C (1 of 10), and disc D, disc E, and disc I (4 of 10 each). As no controls reacted to any of the discs, the weak reactions indicate allergic reactions. Positive patch test reactions to 1770 ppm chromium(VI) in the serial dilutions of potassium dichromate were observed in 7 of 10 patients. When the case group was narrowed down to include only the patients with a current positive patch test reaction to potassium dichromate, elicitation of dermatitis by both chromium(III) and chromium(VI) discs was observed in 4 of 7 of patients. CONCLUSIONS Many of the patients reacted to both chromium(III) and chromium(VI) surfaces. Our results indicate that both chromium(VI) and chromium(III) pose a risk to chromium-allergic patients.
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Affiliation(s)
- David Bregnbak
- Department of Dermatology and Allergy, National Allergy Research Centre, Herlev and Gentofte Hospital, University of Copenhagen, 2900, Hellerup, Denmark
| | - Jacob P Thyssen
- Department of Dermatology and Allergy, National Allergy Research Centre, Herlev and Gentofte Hospital, University of Copenhagen, 2900, Hellerup, Denmark
| | - Morten S Jellesen
- Department of Mechanical Engineering, Materials and Surface Engineering, Technical University of Denmark, 2800, Kongens Lyngby, Denmark
| | - Claus Zachariae
- Department of Dermatology and Allergy, Herlev and Gentofte Hospital, University of Copenhagen, 2900, Hellerup, Denmark
| | - Jeanne D Johansen
- Department of Dermatology and Allergy, National Allergy Research Centre, Herlev and Gentofte Hospital, University of Copenhagen, 2900, Hellerup, Denmark
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