Curcuma rhizome is reported to have a high total phenolics that could act as reducing agents for metals nanoparticles. Rhizomes of five curcuma species were selected bioreductors, namely white turmeric (Curcuma zedoaria), black (C. aeruginosa), fingerroot rotunda), temu giring heyneana), and mango ginger amada). The research was designed select the reductor from rhizomes mentioned above silver ...