Submitted on March 2, 2007
Revised on June 18, 2007
Accepted on June 18, 2007
Specific and rapid analysis of ubiquinones using Craven's reaction and HPLC with postcolumn derivatization
Haruo Shimada, David Kodjabachian, and Masami Ishida
Frontier Science Labs., Shiseido Co., Ltd., Yokohama, Kanagawa 236-8643
Corresponding Author: haruo.shimada{at}to.shiseido.co.jp
A new method for the analysis of ubiquinones in various samples was developed using a high-performance liquid chromatography (HPLC) system with postcolumn derivatization. Craven’s reaction, a specific color reaction for the analysis of ubiquinones was used in the system. Because the reaction progressed in organic solvents that contained ubiquinones and ethylcyanoacetate under an alkaline condition, the selectivity for ubiquionone detection was higher than that for ubiquinone detection using the nonderivatized ultraviolet detection system at 275 nm, a system widely used for the analysis of ubiquinones. The new detection system can avoid the adverse effects of impurities. Furthermore, it can confirm specificity by stopping the color reaction under a neutral condition. The detection limit for ubiquinone-10 was 1 ng (1.2 pmol). A good linearity for the calibration curve was observed in the range of 11.7 pmol-11.7 nmol. To investigate the possible application of this method, various samples, such as soybean capsules used as a dietary supplement and biological materials (rice, and bovine plasma and liver samples), were applied to the system and their ubiquinone content was quantified. This method is thought to be widely and conveniently applicable for determining the level of ubiquinones because of its high selectivity for ubiquinone detection.
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