1. Department of Materials Science and Technology, Faculty of Science; Prince of Songkla University; Hatyai Songkhla 90112 Thailand
2. Department of Chemistry, Faculty of Science; Prince of Songkla University; Hatyai Songkhla 90112 Thailand
3. Bioplastic Research Unit, Department of Materials Science and Technology, Faculty of Science; Prince of Songkla University; Hatyai Songkhla 90112 Thailand