In general, identication of the stoichiometric ratio for green route synthesis is equally important as that of the wet chemical route to minimise the excess precursor during the reaction process. To identify that, the prepared LE (5.0%) was diluted to
0.1, 0.2, 0.3, 0.5, 0.7, and 1.0% solutions and exposed to 1 mM HAuCl4for 2 h to complete the reaction.