Preliminary phytochemical screening
The extract of Curcuma longa was screened to determine the presence
of the following metabolites through preliminary phytochemical
screening. Alkaloids were detected using the Dragendoff’s reagent,
Mayer’s reagent, Wagner’s reagent and tannic acid. Flavonoids
were determined by the ferric chloride test, lead acetate test, sodium
hydroxide test and ethyl acetate test. Tannin detection was by ferric
chloride test and bromine water test, while phlobotannins was with
hydrochloric acid. Saponin was determined with the froth tests and
haemolytic test.