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Alloy nanoparticles have properties that differ from their pure metal form. Alloys can be made to enhance electrical conductivity, strength, hardness, corrosion resistance, and antibacterial properties. As a result, they can be adapted for use when a pure metal would either be unsuitable or cost-prohibitive. In this work, Au-Ag alloy nanoparticles (Au-Ag NPs) have been synthesized using algal-based exopolysaccharides (EPS) as both a reducing and stabilizing agent in a microwave reactor. The use of algal EPS enabled a one-pot synthesis of NPs from a benign biological precursor that produces no harmful products and requires no organic solvents. The alloy NPs formed were homogeneous in nature and sphere-like in shape. The color of the NPs could be altered by changing the molar ratio of Au and Ag precursors. The wavelength of maximum surface plasmon resonance (SPR) absorbance for all the alloy NPs …