{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,8,17]],"date-time":"2026-08-17T13:30:20Z","timestamp":1786973420090,"version":"build-2736575974"},"reference-count":15,"publisher":"SAGE Publications","license":[{"start":{"date-parts":[[2026,8,14]],"date-time":"2026-08-14T00:00:00Z","timestamp":1786665600000},"content-version":"tdm","delay-in-days":0,"URL":"https:\/\/journals.sagepub.com\/page\/policies\/text-and-data-mining-license"}],"content-domain":{"domain":["journals.sagepub.com"],"crossmark-restriction":true},"short-container-title":["Dermatitis\u00ae"],"abstract":"<jats:sec>\n                    <jats:title>Background:<\/jats:title>\n                    <jats:p>\n                      Propolis,\n                      <jats:italic toggle=\"yes\">Myroxylon pereirae<\/jats:italic>\n                      resin (balsam of Peru), and colophonium are complex botanical materials that frequently co-react when patch tested. Detailed knowledge of their compositions may help explain the co-reactivity pattern and identify the haptens responsible for positive patch tests.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Objective:<\/jats:title>\n                    <jats:p>\n                      To study the compositions of propolis,\n                      <jats:italic toggle=\"yes\">M. pereirae<\/jats:italic>\n                      resin, and colophonium used for patch testing and assess whether they contain identical ingredients.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Methods:<\/jats:title>\n                    <jats:p>\n                      The ingredients of 3 samples of propolis, 2 of\n                      <jats:italic toggle=\"yes\">M. pereirae<\/jats:italic>\n                      resin and 2 of colophonium used for preparing patch test preparations by Chemotechnique and SmartPractice (brand Allergeaze) were analyzed using gas chromatography\u2014mass spectrometry.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Results:<\/jats:title>\n                    <jats:p>\n                      Major ingredients in Brazilian propolis were non-volatile fatty materials; in Chinese propolis tectochrysin, pinostrobin, pinocembrin, and\n                      <jats:italic toggle=\"yes\">p<\/jats:italic>\n                      -vinylguaiacol; in\n                      <jats:italic toggle=\"yes\">M. pereirae<\/jats:italic>\n                      resin benzyl benzoate, benzyl cinnamate and nerolidol; in colophonium Chemotechnique isoabienol, \u03b2-caryophyllene, sandaracopimarinal, sandaracopimarinol and longifolene; in colophonium Allergeaze lupeol acetate, longifolene, sandaracopimarinol, abietinal and isoabienol. Only 11 chemicals were present in 2 materials, none in all 3.\n                    <\/jats:p>\n                  <\/jats:sec>\n                  <jats:sec>\n                    <jats:title>Conclusions:<\/jats:title>\n                    <jats:p>\n                      Very few identical chemicals were found in propolis,\n                      <jats:italic toggle=\"yes\">M. pereirae<\/jats:italic>\n                      resin, and colophonium. The results do not support the notion that the frequently observed co-reactivity to these complex natural materials can be explained by identical chemicals detected in this study.\n                    <\/jats:p>\n                  <\/jats:sec>","DOI":"10.1177\/17103568261476312","type":"journal-article","created":{"date-parts":[[2026,8,14]],"date-time":"2026-08-14T08:00:42Z","timestamp":1786694442000},"update-policy":"https:\/\/doi.org\/10.1177\/sage-journals-update-policy","source":"Crossref","is-referenced-by-count":0,"title":["Compositions of Propolis,\n                    <i>Myroxylon pereirae<\/i>\n                    Resin, and Colophonium for Patch Testing: Analyses With Gas Chromatography\u2014Mass Spectrometry"],"prefix":"10.1177","author":[{"given":"Evelyn","family":"Calta","sequence":"first","affiliation":[{"name":"From the *Kurt Kitzing GmbH, Wallerstein, Germany"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6666-7292","authenticated-orcid":false,"given":"Anton","family":"de Groot","sequence":"additional","affiliation":[{"name":"Dermato-Allergology and Occupational Dermatology, Amsterdam University Medical Center, Amsterdam, The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Aleksandra","family":"Chojnacka","sequence":"additional","affiliation":[{"name":"Van \u2018t Hoff Institute for Molecular Sciences (HIMS), University of Amsterdam, Amsterdam, The Netherlands."}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Norbertus A.","family":"Ipenburg","sequence":"additional","affiliation":[{"name":"Dermato-Allergology and Occupational Dermatology, Amsterdam University Medical Center, Amsterdam, The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Thomas","family":"Rustemeyer","sequence":"additional","affiliation":[{"name":"Dermato-Allergology and Occupational Dermatology, Amsterdam University Medical Center, Amsterdam, The Netherlands"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"179","published-online":{"date-parts":[[2026,8,14]]},"reference":[{"key":"e_1_3_1_2_1","doi-asserted-by":"publisher","DOI":"10.1177\/17103568251392243"},{"key":"e_1_3_1_3_1","doi-asserted-by":"publisher","DOI":"10.1097\/DER.0000000000000011"},{"key":"e_1_3_1_4_1","doi-asserted-by":"publisher","DOI":"10.1111\/cod.13263"},{"key":"e_1_3_1_5_1","doi-asserted-by":"publisher","DOI":"10.1111\/cod.14796"},{"key":"e_1_3_1_6_1","doi-asserted-by":"publisher","DOI":"10.1111\/cod.14807"},{"key":"e_1_3_1_7_1","doi-asserted-by":"publisher","DOI":"10.1089\/derm.2025.0023"},{"key":"e_1_3_1_8_1","doi-asserted-by":"publisher","DOI":"10.1111\/cod.14678"},{"key":"e_1_3_1_9_1","doi-asserted-by":"publisher","DOI":"10.1111\/cod.14701"},{"key":"e_1_3_1_10_1","doi-asserted-by":"publisher","DOI":"10.1021\/tx7002239"},{"key":"e_1_3_1_11_1","doi-asserted-by":"publisher","DOI":"10.1034\/j.1600-0536.2002.470204.x"},{"key":"e_1_3_1_12_1","doi-asserted-by":"publisher","DOI":"10.1111\/cod.14213"},{"key":"e_1_3_1_13_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.0105-1873.2005.00605.x"},{"key":"e_1_3_1_14_1","doi-asserted-by":"publisher","DOI":"10.1021\/tx00038a020"},{"key":"e_1_3_1_15_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1600-0536.1993.tb03556.x"},{"key":"e_1_3_1_16_1","doi-asserted-by":"publisher","DOI":"10.1111\/j.1600-0536.1988.tb02888.x"}],"container-title":["Dermatitis\u00ae"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/journals.sagepub.com\/doi\/pdf\/10.1177\/17103568261476312","content-type":"application\/pdf","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/journals.sagepub.com\/doi\/full-xml\/10.1177\/17103568261476312","content-type":"application\/xml","content-version":"vor","intended-application":"text-mining"},{"URL":"https:\/\/journals.sagepub.com\/doi\/pdf\/10.1177\/17103568261476312","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2026,8,17]],"date-time":"2026-08-17T13:17:51Z","timestamp":1786972671000},"score":1,"resource":{"primary":{"URL":"https:\/\/journals.sagepub.com\/doi\/10.1177\/17103568261476312"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2026,8,14]]},"references-count":15,"alternative-id":["10.1177\/17103568261476312"],"URL":"https:\/\/doi.org\/10.1177\/17103568261476312","relation":{},"ISSN":["1710-3568","2162-5220"],"issn-type":[{"value":"1710-3568","type":"print"},{"value":"2162-5220","type":"electronic"}],"subject":[],"published":{"date-parts":[[2026,8,14]]},"article-number":"17103568261476312"}}