1. Personal Health Care Products Research Laboratory, Kao Corporation, 2-1-3 Bunka, Sumida-ku, Tokyo 131-8501, Japan
2. Analytical Science Research Laboratories, Kao Corporation, 1334 Minato, Wakayama 640-8580, Japan
3. Department of Materials Engineering and Department of Bioengineering, School of Engineering, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-8656, Japan