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Skin sensitization potency of isoeugenol and its dimers evaluated by a non‐radioisotopic modification of the local lymph node assay and guinea pig maximization test
Author(s) -
Takeyoshi Masahiro,
Iida Kenji,
Suzuki Keiko,
Yamazaki Shunsuke
Publication year - 2008
Publication title -
journal of applied toxicology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.784
H-Index - 87
eISSN - 1099-1263
pISSN - 0260-437X
DOI - 10.1002/jat.1305
Subject(s) - isoeugenol , local lymph node assay , sensitization , eugenol , chemistry , skin sensitization , potency , cosmetics , pharmacology , guinea pig , stereochemistry , biochemistry , medicine , in vitro , organic chemistry , immunology
Allergic contact dermatitis is the serious unwanted effect arising from the use of consumer products such as cosmetics. Isoeugenol is a fragrance chemical with spicy, carnation‐like scent, is used in many kinds of cosmetics and is a well‐known moderate human sensitizer. It was previously reported that the dimerization of eugenol yielded two types of dimer possessing different sensitization potencies. This study reports the differences in skin sensitization potencies for isoeugenol and two types of dimer, β ‐O‐4‐dilignol and dehydrodiisoeugenol (DIEG), as evaluated by the non‐radioisotopic local lymph node assay (non‐RI LLNA) and guinea pig maximization test. In the guinea pig maximization test, isoeugenol, β ‐O‐4‐dilignol and DIEG were classified as extreme, weak and moderate sensitizers, respectively. As for the results of non‐RI LLNA, the EC3 for isoeugenol, β ‐O‐4‐dilignol and DIEG were calculated as 12.7%, >30% and 9.4%, respectively. The two types of isoeugenol dimer showed different sensitizing activities similar to the case for eugenol dimers. A reduction of sensitization potency achieved by dimerization may lead to developing safer cosmetic ingredients. Isoeugenol dimers are not currently used for fragrance chemicals. However, the dimerization of isoeugenol may yield a promising candidate as a cosmetic ingredient with low sensitization risk. The data may also provide useful information for the structure‐activity relationship (SAR) in skin sensitization. Copyright © 2007 John Wiley & Sons, Ltd.