1. Department of Chemistry Faculty of Science Chulalongkorn University Bangkok 10330 Thailand
2. Department of Preventive and Social Medicine Faculty of Medicine Bangkok 10330 Thailand
3. Department of Chemistry Faculty of Science Chulalongkorn University Bangkok 10330 Thailand
4. Electrochemistry and Optical Spectroscopy Center of Excellence (EOSCE) Department of Chemistry Faculty of Science Chulalongkorn University Bangkok 10330 Thailand.