2.5. Analysis of Yaba samples
Five seized Yaba samples obtained from the Drug Control
Division of the Food and Drug Administration of Thailand. A sample
of ten milligrams from each Yaba sample was extracted with 1 mL
of water and sonicated for 5 min. The supernatant was analyzed
using the Marquis and Simon test. Samples were also quantified
using the iPhone method under test and using GC-FID. For gas
chromatographic analysis, methanol was used to extract the
methamphetamine from the Yaba.