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- W2017453612 abstract "Allergy to <i>p-tert</i>-butylphenol formaldehyde resin (PTBP-F-R) is not rare. More knowledge about the sensitizers in the resin can contribute to the development of diagnosis and prevention. The objective was to study some trimers in PTBP-F-R. Preparative and analytical high-pressure liquid chromatography, nuclear magnetic resonance spectrometry, mass spectrometry and patch testing in patients hypersensitive to PTBP-F-R were used. Four trimers were isolated and identified: 4-<i>tert</i>-butyl-2,6- bis-(5-<i>tert</i>-butyl-2-hydroxy-3-hydroxymethyl-benzyloxy-methyl)-phenol (XIII), 4-<i>tert</i>-butyl-2-(5-<i>tert</i>-butyl-2-hydroxy-benzyloxymethyl)-6-(5-<i>tert</i>-butyl-2-hydroxy-3-hydroxymethyl-benzyloxymethyl)-phenol (XIVa), 9,17,25-tri-<i>tert</i>-butyl-27,28,29-trihydroxy-2,3,4,5,12,13,20,21-octahomo-3,5,13,21-tetraoxacalix[3]arene (XVIIa) and 7,15,23-tri-<i>tert</i>-butyl-25,26,27-trihydroxy-2,3,10,11,18,19-hexahomo-3,11,19-trioxacalix[3]arene (XVIII). Six patients hypersensitive to PTBP-F-R were patch tested with serial dilutions of XIII, XIVa, XVIIa and XVIII. Six 6, 1 and 0 patients reacted positively to XIII, XIVa, XVIIa and XVIII, respectively. No control patient reacted positively to XIII or XIVa. Positive patch test reactions were seen down to 0.025 mmol × 1<sup>–1</sup> for XIII and XIVa. The study shows that XIII and XIVa are allergens in PTBP-F-R and strongly argues that XVIIa is also one." @default.
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- W2017453612 title "Contact Allergy to Trimers in <i>p-tert</i>-Butylphenol-Formaldehyde Resin" @default.
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- W2017453612 doi "https://doi.org/10.1159/000066147" @default.
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