camera.
Instrumentation and Analytical Condition
The UV method was performed using Perkin-Elmer
spectrophotometer at 320 nm using a 1.0 cm quartz
cell. Software UV Winlab was used for all absorbance
measurements.
Preparation of Standard Solutions
A stock solution of α-mangostin reference standard
was prepared by dissolving an accurately weighed 10
mg of α-mangostin in 100 ml of methanol in a
volumetric flask. From this solution, various concentrations
of the standard solution were prepared in 10 ml of
methanol in a volumetric flask to obtain final
concentrations at 20, 16, 8, 4, and 2 μg/ml.