Detection of tannins
Tannins were detected according to the method described by (Galdo et
al., 2006.). About 1-2 ml of the ethanolic extract, few drops of 5% w/v
Iron(III) chloride solution was added in a test tube. A green colour
indicated the presence of gallotannins, while brown colour indicated the
presence of pseudotannins.
Note
These tests were repeated on samples of Eucalyptus, Sugarcane,
Maize, Bamboo, and Cypress.