1. Graduate School of Biotechnology, Korea University, Seoul, 136-701, Korea
2. College of Pharmacy, Chungnam National University, Taejon, 305-764, Korea
3. Sama Pharm., Co., Ltd, Euwang-Shi, Kyunggi-do, 437-821, Korea
4. Department of Packaging Science, Clemson University, Clemson, SC, 29634-0370, USA