Biochemical Engineering and Pilot Plant Research and Development (BEC) Unit, National Center for Genetic Engineering and Biotechnology, National Science and Technology Development Agency at King Mongkuts University of Technology Thonburi, 49 Soi Thian Thalae 25, Bang Khun Thian Chai Thalae Rd., Tha Kham, Bang Khun Thian, Bangkok, 10150, Thailand. apiradee@biotec.or.th.