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- W2034246178 abstract "Background A 30-min application of a hair dye product containing 2% p-phenylenediamine (PPD) to subjects diagnostically graded +, showed that 12 of 18 reacted; eight of 18 with a true + and four of 18 with a doubtful (?+) response, whereas six of 18 did not react at all. In vitro skin-binding experiments showed that for diagnostic patch test conditions the measured exposure level (MEL) is more than 10-fold higher than the MEL for hair dyeing conditions. Objective To further analyse the limited elicitation response of the diagnostically + graded subjects to a PPD hair dye product, under standardized test conditions mimicking product usage, by varying exposure time and dose. Methods A hair dye model formulation containing 2% PPD, applied for 30, 45 and 60 min and a diagnostic PPD TRUE test® were applied to assess elicitation responses to increasing PPD exposure levels. Grading was performed according to International Contact Dermatitis Research Group guidelines. Results Six subjects were available for this follow-up study. One of six subjects responded with a + elicitation response to the hair dye model applied for 60 min. Four of the five remaining subjects elicited a + response to the PPD TRUE test® applied subsequently, while one of five responded doubtfully. Conclusions Increasing the PPD exposure time twofold – resulting in a 5–6% increase of sensitivity of this hair dye model test – or further extending the exposure time 48-fold, was found sufficient to increase the MEL above the thresholds needed to elicit individuals with a + diagnostic PPD patch test who did not react to typical hair dye use conditions with a MEL of about 6·8 μg cm−². This analysis confirms that consideration of the MEL is a useful tool to better characterize thresholds of elicitation than consideration of the applied dose alone." @default.
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- W2034246178 date "2014-12-08" @default.
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- W2034246178 title "Assessment of the elicitation response in subjects weakly sensitized to<i>p</i>-phenylenediamine" @default.
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- W2034246178 doi "https://doi.org/10.1111/bjd.13142" @default.
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