The invention provides stabilized, biocompatible gold nanoparticles that are stabilized with material from polyphenols- or flavanoids-rich plant material or reactive phytochemical components of the plant material. The gold nanoparticles of the invention can be fabricated with an environmentally friendly method for making biocompatible stabilized gold nanoparticles. In preferred embodiments, the coating consists of material from polyphenols- or flavanoids-rich plant material or reactive phytochemical components of the plant material.
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