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Chemical Methods for Detection of Allergens and Skin Exposure. Contact Dermatitis 2021. [DOI: 10.1007/978-3-030-36335-2_27] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/23/2022]
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Chemical Methods for Detection of Allergens and Skin Exposure. Contact Dermatitis 2020. [DOI: 10.1007/978-3-319-72451-5_27-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Chemical Methods for Detection of Allergens and Skin Exposure. Contact Dermatitis 2019. [DOI: 10.1007/978-3-319-72451-5_27-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/25/2022]
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Ramzy AG, Lammintausta K, Matura M, Bråred Christensson J, Nilsson U, Hagvall L. Isothiocyanates are important as haptens in contact allergy to chloroprene rubber. Br J Dermatol 2017; 177:522-530. [PMID: 28295200 DOI: 10.1111/bjd.15444] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Accepted: 02/27/2017] [Indexed: 12/29/2022]
Abstract
BACKGROUND Contact allergy to chloroprene rubber products is well known. Thiourea compounds are considered the cause of allergy. Diethylthiourea commonly occurs in this type of product and can decompose to the sensitizer ethyl isothiocyanate. OBJECTIVES To investigate the clinical importance of degradation products and metabolites from organic thioureas in contact allergy to chloroprene rubber with a focus on isothiocyanates and isocyanates. METHODS Patients with contact allergy to diphenylthiourea were patch tested with phenyl isothiocyanate and phenyl isocyanate. Patients with known contact allergy to diethylthiourea were retested with diethylthiourea, while chemical analyses of their chloroprene rubber products were performed. The stability of diethylthiourea, diphenylthiourea and dibutylthiourea in patch-test preparations was investigated. Liquid chromatography/mass spectrometry and solid-phase microextraction/gas chromatography were used for determination of organic thioureas and isothiocyanates. RESULTS All patients allergic to diphenylthiourea reacted to phenyl isothiocyanate, two of eight reacted to phenyl isocyanate and six of eight reacted to diphenylthiourea. Four patients allergic to diethylthiourea reacted at retest; diethylthiourea was detected in all chloroprene rubber samples, with levels of 2-1200 nmol cm-2 . At 35 °C, ethyl isothiocyanate was emitted from all samples. Patch-test preparations of diethylthiourea, diphenylthiourea and dibutylthiourea all emitted the corresponding isothiocyanate, with diethylthiourea showing the highest rate of isothiocyanate emission. CONCLUSIONS Thiourea compounds are degraded to isothiocyanates, which are generally strong or extreme sensitizers, thus acting as prehaptens. This process occurs in both chloroprene rubber products and patch-test preparations. Positive reactions to phenyl isocyanate indicate cutaneous metabolism, as the only known source of exposure to phenyl isocyanate is through bioactivation of diphenylthiourea.
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Affiliation(s)
- A G Ramzy
- Department of Environmental Science and Analytical Chemistry, Stockholm University, Svante Arrhenius väg 16, Stockholm, SE-106 91, Sweden
| | - K Lammintausta
- Department of Dermatology, Turku University Hospital, Turku, 20521, Finland
| | - M Matura
- Centre for Occupational and Environmental Medicine, Stockholm County Council and Institute of Environmental Medicine, Karolinska Institutet, Stockholm, 171 77, Sweden
| | - J Bråred Christensson
- Department of Dermatology, Sahlgrenska Academy at University of Gothenburg, Gothenburg, 413 45, Sweden.,Dermatochemistry, Department of Chemistry and Molecular Biology, University of Gothenburg, Gothenburg, 412 96, Sweden
| | - U Nilsson
- Department of Environmental Science and Analytical Chemistry, Stockholm University, Svante Arrhenius väg 16, Stockholm, SE-106 91, Sweden
| | - L Hagvall
- Department of Dermatology, Sahlgrenska Academy at University of Gothenburg, Gothenburg, 413 45, Sweden
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Neoprene Orthopaedic Supports: An Underrecognised Cause of Allergic Contact Dermatitis. Case Rep Orthop 2015; 2015:496790. [PMID: 26236520 PMCID: PMC4508468 DOI: 10.1155/2015/496790] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2015] [Accepted: 06/28/2015] [Indexed: 11/18/2022] Open
Abstract
Thioureas, often contained within neoprene to provide water resistance, are an important cause of allergic contact dermatitis (ACD) in those who use neoprene products. We wish to present three cases of thiourea-induced ACD from three different orthopaedic supports containing neoprene. The first case was a 67-year-old woman who developed an itchy rash on her heel three weeks after using a neoprene insole for plantar fasciitis. The second case was a 47-year-old man who developed an itchy rash on his wrist after wearing neoprene wrist splints for psoriatic arthropathy. The third case was a 77-year-old woman who experienced a severe erythematous rash with blistering from a neoprene elbow brace she received following a humeral fracture. All patients were patch tested to the British Society of Cutaneous Allergy Standard and rubber series and a cut piece from all the relevant supports. At 96 hours, all patients had a + reaction to mixed dialkylthiourea, diethylthiourea, and the supports' material. No other positive patch test reactions were identified. As neoprene is fast becoming one of the most popular materials used for orthopaedic supports, awareness of this reaction and close liaison between dermatologists and orthopaedic surgeons are therefore essential to allow for early recognition of this complication.
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Ramzy AG, Hagvall L, Pei MN, Samuelsson K, Nilsson U. Investigation of diethylthiourea and ethyl isothiocyanate as potent skin allergens in chloroprene rubber. Contact Dermatitis 2014; 72:139-46. [PMID: 25532938 DOI: 10.1111/cod.12318] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/30/2014] [Revised: 09/26/2014] [Accepted: 10/14/2014] [Indexed: 10/24/2022]
Abstract
BACKGROUND Exposure to chloroprene rubber has resulted in numerous cases of allergic contact dermatitis, attributed to organic thiourea compounds used as vulcanization accelerators. However, thiourea compounds are not considered to be strong haptens. OBJECTIVES To analyse common commercial chloroprene materials for their contents of diethylthiourea (DETU), dibutylthiourea (DBTU), diphenylthiourea (DPTU), and their degradation products, isothiocyanates; and to investigate the sensitization potencies of possible degradation products of the mentioned thiourea compounds. METHODS Liquid chromatography/mass spectrometry (MS) was used for quantification of organic thiourea compounds in chloroprene products, such as medical, sports and diving gear; isothiocyanates were measured by solid-phase microextraction/gas chromatography/MS. Sensitization potencies were determined with the murine local lymph node assay (LLNA). RESULTS DETU was identified at concentrations of 2.7-9.4 µg/cm(2) in all samples, whereas neither DBTU nor DPTU was detected. At 37°C, degradation of DETU in the materials to ethyl isothiocyanate (EITC) was detected. EITC and ethyl isocyanate showed extreme and strong sensitization potencies, respectively, in the LLNA. CONCLUSIONS DETU can act as a prehapten, being degraded to EITC when subjected to body temperature upon skin contact. EITC could thus be the culprit behind allergic contact dermatitis caused by chloroprene rubber.
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Affiliation(s)
- Ahmad G Ramzy
- Department of Analytical Chemistry, Stockholm University, Svante Arrhenius väg 16, SE-106 91, Stockholm, Sweden
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Hansson C, Pontén A, Svedman C, Bergendorff O. Reaction profile in patch testing with allergens formed during vulcanization of rubber. Contact Dermatitis 2014; 70:300-8. [DOI: 10.1111/cod.12168] [Citation(s) in RCA: 39] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/28/2013] [Revised: 09/12/2013] [Accepted: 09/25/2013] [Indexed: 11/30/2022]
Affiliation(s)
- Christer Hansson
- Department of Dermatology; Skåne University Hospital; SE-221 85 Lund Sweden
| | - Ann Pontén
- Department of Occupational and Environmental Dermatology; Skåne University Hospital; SE-205 02 Malmö Sweden
| | - Cecilia Svedman
- Department of Occupational and Environmental Dermatology; Skåne University Hospital; SE-205 02 Malmö Sweden
| | - Ola Bergendorff
- Department of Dermatology; Skåne University Hospital; SE-221 85 Lund Sweden
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Norwood DL, Jenke D, Manolescu C, Pennino S, Grinberg N. HPLC and LC/MS Analysis of Pharmaceutical Container Closure System Leachables and Extractables. J LIQ CHROMATOGR R T 2009. [DOI: 10.1080/10826070902959497] [Citation(s) in RCA: 20] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/20/2022]
Affiliation(s)
- Daniel L. Norwood
- a Boehringer Ingelheim Pharmaceuticals, Inc. , Ridgefield, Connecticut, USA
| | - Dennis Jenke
- b Baxter Healthcare Corporation , Round Lake, Illinois, USA
| | - Cristina Manolescu
- a Boehringer Ingelheim Pharmaceuticals, Inc. , Ridgefield, Connecticut, USA
| | - Scott Pennino
- a Boehringer Ingelheim Pharmaceuticals, Inc. , Ridgefield, Connecticut, USA
| | - Nelu Grinberg
- a Boehringer Ingelheim Pharmaceuticals, Inc. , Ridgefield, Connecticut, USA
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Martínez-González M, Goday-Buján J, Almagro M, Fonseca E. Dermatitis alérgica de contacto a dietiltiourea por un traje de pesca de neopreno. ACTAS DERMO-SIFILIOGRAFICAS 2009. [DOI: 10.1016/s0001-7310(09)70826-9] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/25/2022] Open
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Martínez-González M, Goday-Buján J, Almagro M, Fonseca E. Allergic Contact Dermatitis to Diethylthiourea in a Neoprene Wader. ACTAS DERMO-SIFILIOGRAFICAS 2009. [DOI: 10.1016/s1578-2190(09)70069-1] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/27/2022] Open
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Crépy MN, Francuz B, Gorodetzky M, Choudat D. Les gants : une cause fréquente d’eczéma d’origine professionnelle. ARCH MAL PROF ENVIRO 2008. [DOI: 10.1016/j.admp.2008.05.002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
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Scheman A, Jacob S, Zirwas M, Warshaw E, Nedorost S, Katta R, Cook J, Castanedo-Tardan MP. Contact Allergy: Alternatives for the 2007 North American Contact Dermatitis Group (NACDG) Standard Screening Tray. Dis Mon 2008; 54:7-156. [DOI: 10.1016/j.disamonth.2007.10.002] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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Bergendorff O, Persson C, Lüdtke A, Hansson C. Chemical changes in rubber allergens during vulcanization. Contact Dermatitis 2007; 57:152-7. [PMID: 17680862 DOI: 10.1111/j.1600-0536.2007.01194.x] [Citation(s) in RCA: 29] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Allergic contact dermatitis to rubber is caused by residues of chemicals used in manufacturing a rubber product. Several different additives are used to achieve a final product of the desired characteristics. Accelerators such as thiurams, dithiocarbamates, and mercaptobenzothiazoles are often among the additives responsible for allergic reactions recognized by dermatologists. The chemistry of the vulcanization process is complicated; as it occurs at an elevated temperature with a mixture of reactive chemicals, the compositions of the initial and final products differ. This paper investigates the changes in composition of common allergens during vulcanization, doing so by chemically analysing various rubber formulations at different stages of the process. Major changes were found in which added chemicals were consumed and new ones produced. An important observation is that thiuram disulfides rarely appear in the final rubber although they may have been used as additives. Instead, thiurams are often converted to dithiocarbamates or to products formed by addition to mercaptobenzothiazole structures, if these have been used together with thiurams as accelerators.
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Affiliation(s)
- Ola Bergendorff
- Department of Dermatology, University Hospital, Lund University, SE-221 85 Lund, Sweden.
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Bergendorff O, Persson C, Hansson C. High-performance liquid chromatography analysis of rubber allergens in protective gloves used in health care. Contact Dermatitis 2006; 55:210-5. [PMID: 16958918 DOI: 10.1111/j.1600-0536.2006.00912.x] [Citation(s) in RCA: 32] [Impact Index Per Article: 1.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/26/2022]
Abstract
A high-performance liquid chromatography (HPLC) method developed for analysis of zinc dithiocarbamates was validated and used to perform a survey of disposable medical gloves used in southern Sweden. The gloves were extracted with acetone at room temperature for 10 min by shaking. The extracts were injected into a polyether ether ketone lined HPLC column, and peaks were analysed by a diode-array detector. The survey shows that of 19 gloves analysed, 10 contained zinc diethyldithiocarbamate (0.070-3.5 mg/g), 3 contained zinc pentamethylenedithiocarbamate (1.0-4.3 mg/g), 4 contained zinc dibutyldithiocarbamate (0.9-1.1 mg/g), and 2 contained 2-mercaptobenzothiazole (0.005-0.008 mg/g). None of them contained thiurams.
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Affiliation(s)
- Ola Bergendorff
- Department of Dermatology, Lund University, University Hospital, SE-221 85 Lund, Sweden.
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Abstract
PURPOSE OF REVIEW The aim of this article is to review recent findings in contact allergy, regarding clinical research. RECENT FINDINGS The biocide methyldibromo glutaronitrile was identified to be an important sensitizer. Subsequently, it was banned from leave-on cosmetics in the European Union. Another group of important allergens that have been studied extensively included the fragrances oak moss absolute, isoeugenol, hydroxyisohexyl 3-cyclohexene carboxaldehyde and farnesol. A new fragrance mix II has been developed for standard testing, which includes the two latter compounds. Dose response studies have demonstrated broad individual variation of elicitation thresholds, dependent on the allergen concentration during induction, and other factors. Some unsuspected routes of exposure to allergens include oral, inhalational, connubial or airborne contact. Experimental studies provide a classification of newly introduced chemicals; increasingly, the local lymph node assay is supplementing and potentially replacing the guinea pig maximization test. Recent advances in occupational contact allergy include, for example, some attempts to improve diagnostics for epoxy resin and other plastic, glue, and cutting fluid components. SUMMARY Constant awareness for new allergens, confirmed by critical evaluation, standardization of patch test materials, and the identification of temporal patterns and subgroups at risk will improve both the diagnosis and prevention of allergic contact dermatitis.
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Affiliation(s)
- Wolfgang Uter
- Department of Medical Informatics, Biometry and Epidemiology, University of Erlangen-Nuremberg, Erlangen, Germany.
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Bergendorff O, Persson C, Hansson C. Extraction of haptens from solid products and their delivery to the skin, exemplified by dithiocarbamates from rubber gloves. Contact Dermatitis 2005; 53:22-6. [PMID: 15982227 DOI: 10.1111/j.0105-1873.2005.00616.x] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
Allergic contact dermatitis is often caused by solid products such as rubber gloves. Patch testing with the product as is often gives negative results. Extraction of the haptens into an organic solvent is commonly performed to achieve a more correct investigation. The technique used for extraction of haptens from solid materials is only sporadically described. In this study, we investigated and optimized the yields of dithiocarbamates obtained by extraction from rubber gloves. The influence of solvent, extraction time and the procedures for extraction are evaluated. The delivery of zinc dibutyldithiocarbamate from the patch test preparation to the skin is determined.
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Affiliation(s)
- O Bergendorff
- Department of Dermatology, Lund University, Lund, Sweden
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