1. Department of Chemistry Faculty of Science Chiang Mai University Chiang Mai 50200 Thailand
2. Center of Excellence for Innovation in Chemistry Faculty of Science Chiang Mai University Chiang Mai 50200 Thailand
3. Graduate School Chiang Mai University Chiang Mai 50200 Thailand
4. Research Center on Chemistry for Development of Health Promoting Products from Northern Resources Faculty of Science Chiang Mai University Chiang Mai 50200 Thailand
5. Department of Chemistry University of Bath, Claverton Down Bath BA2 7AY UK
6. Center of Excellence in Materials Science and Technology Chiang Mai University Chiang Mai 50200 Thailand