1. Trace Analysis and Biosensor Research Center; Prince of Songkla University; Hat Yai Songkhla Thailand
2. Center of Excellence for Innovation in Chemistry, Department of Chemistry, Faculty of Science; Prince of Songkla University; Hat Yai Songkhla Thailand
3. National Corn and Sorghum Research Center; Kasetsart University; Pak Chong Nakhon Ratchasima Thailand