{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,10,6]],"date-time":"2026-10-06T01:49:28Z","timestamp":1791251368397,"version":"4.1.0"},"reference-count":20,"publisher":"Wiley","issue":"5","license":[{"start":{"date-parts":[[2023,8,7]],"date-time":"2023-08-07T00:00:00Z","timestamp":1691366400000},"content-version":"vor","delay-in-days":0,"URL":"http:\/\/onlinelibrary.wiley.com\/termsAndConditions#vor"}],"content-domain":{"domain":["onlinelibrary.wiley.com"],"crossmark-restriction":true},"short-container-title":["Contact Dermatitis"],"published-print":{"date-parts":[[2023,11]]},"abstract":"<jats:title>Abstract<\/jats:title><jats:sec><jats:title>Background<\/jats:title><jats:p>The allergen responsible for cocamidopropyl betaine (CAPB) allergies has been debated.<\/jats:p><\/jats:sec><jats:sec><jats:title>Objectives<\/jats:title><jats:p>To investigate the sensitizing agents of CAPB, the patch test positivity rates of impurities were examined in Japanese patients with CAPB\u2010related allergic contact dermatitis.<\/jats:p><\/jats:sec><jats:sec><jats:title>Materials and Methods<\/jats:title><jats:p>Thirty patients with scalp dermatitis and positive patch tests for CAPB and\/or lauramidopropyl betaine (LAPB) were enrolled in this study. They were patch tested with the detergents that they had been using at the time of their first visit and with the impurities dimethylaminopropylamine (DMAPA) and lauramidopropyl dimethylamine (LAPDMA).<\/jats:p><\/jats:sec><jats:sec><jats:title>Results<\/jats:title><jats:p>The positivity rate in patch tests of the 37 detergents that the patients had been using was 78.4% (29\/37). The positivity rates of DMAPA 1% pet., 1% aq. and 0.2% aq. were 32.1% (9\/28), 14.3% (4\/28) and 13.3% (4\/30), respectively, whereas those of LAPDMA 0.1% and 0.05% were 30.0% (9\/30) and 16.7% (5\/30), respectively. Among the 30 patients, 6 exhibited positive results for both DMAPA and LAPDMA, 3 showed positive results for DMAPA alone and 6 produced positive results for LAPDMA alone.<\/jats:p><\/jats:sec><jats:sec><jats:title>Conclusion<\/jats:title><jats:p>Patch tests produced an overall positivity rate for DMAPA, LAPDMA or both of 50.0% (15\/30) in patients with scalp dermatitis and positive patch test results for CAPB and\/or LAPB.<\/jats:p><\/jats:sec>","DOI":"10.1111\/cod.14393","type":"journal-article","created":{"date-parts":[[2023,8,8]],"date-time":"2023-08-08T01:18:45Z","timestamp":1691457525000},"page":"368-373","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Analysis of patch testing with cocamidopropyl betaine and its impurities in patients with intractable scalp dermatitis in a single clinic in <scp>Japan<\/scp>"],"prefix":"10.1111","volume":"89","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9945-7064","authenticated-orcid":false,"given":"Shigeruko","family":"Iijima","sequence":"first","affiliation":[{"name":"Division of Dermatology Hanamizuki Clinic  Ushiku Ibaraki Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Kayo","family":"Murayama","sequence":"additional","affiliation":[{"name":"Division of Dermatology Hanamizuki Clinic  Ushiku Ibaraki Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Noriko","family":"Takayama","sequence":"additional","affiliation":[{"name":"Division of Gynecology Hanamizuki Clinic  Ushiku Ibaraki Japan"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Takumi","family":"Akiyama","sequence":"additional","affiliation":[{"name":"Division of Environmental Chemistry National Institute of Health Sciences  Kawasaki Kanagawa 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