국내 허용 염모제 성분의 모발손상도에 한 연구

Abstract

In order to study the level of hair damage caused by the ingredients in hair dye specified by the Ministry of Food and Drug Administration(MFDS), this study selected ingredients that lack information such as physicochemical characteristics, level of hair damage, and etc. among 40 different hair dye products. Then we analyzed the effect on hair damage of 8 different ingredients in hair dye and the ingredients include: nitro-p-phenylenediamine(S1), sulfate p-nitro-o phenylenediamine(S2), p-nitro-o- phenylenediamine(S3), 5-amino-o-cresol(S4), p-methyl aminophenol(S5), 2-methyl resorcinol(S6), 1,5 dihydroxy naphthalene(S7), and 2,4-diaminophenol hydrochloride(S8). In order to measure the porosity, a measurement of hair damage, the hair was put into methylene blue solution. To test the dynamic properties of the hair, we tested the tensile strength, yield strength, and rate of elongation using the Universal Testing Machine(UTM). Also, to observe the changes in the morphological structures of the hair surface, we observed it with a scanning electron microscopy(SEM). The results show that among the ingredients that were tested S4, S6, S7, and S8 showed most hair damage. This study only measured the level of hair damage caused by single ingredients in hair dye, and future studies that measure the level of hair damage caused by mixing various ingredients in hair dye together could provide useful information to hair dye manufacturers, hair stylists, and consumers.