Determination of Urea in Cosmetics by IC-FIA System with Woody Biomass Type Cation Exchanger Adsorbing Oils and Fats

作者：Miyauchi Toshiyuki^*; Suzuki Masashi; Suzuki Takuya; Mizuno Yuuya; Ishikawa Norihisa

来源：Bunseki Kagaku, 2014, 63(9): 751-755.

DOI：10.2116/bunsekikagaku.63.751

• urease
• cosmetics
• ion chromatograph
• woody biomass

A quantitative method for the determination of urea in cosmetics was studied. An ion chromatograph (IC) with a conductivity detector was used in this method, where the chromatograph was modified by placing a cation exchanger column and an immobilized urease column on the injection loop with a 6-way valve in IC. A sulfo-type cation exchanger based on cedar sawdust had an ability to remove oils dispersing in a cosmetics sample solution. Therefore, by using the above-mentioned reactor, the urea concentration in commercial cosmetics, such as cream, skin lotion shampoo, and rinse could be determined The time required for measuring one sample was within 7 minutes after developing a cosmetics sample, and the correlation coefficients between the cosmetics urea concentration obtained by this reactor (IC) and by the spectrophotometric method (diacetylmonooxime) were 0.999.

• 出版日期2014-9