1-Hydroxyphenazine is a phenazine derivative naturally produced by pathogenic bacteria such as Pseudomonas aeruginosa to aid in survival and antagonism against other microbes. It serves as an antimicrobial agent in agricultural formulations to control bacterial and fungal plant pathogens. Acts as a redox mediator in biological systems, enhancing electron transfer in microbial fuel cells and bioremediation processes. Employed in research for its role in inhibiting biofilm formation and quorum sensing in bacteria. Also utilized in dye-sensitized solar cells due to its light absorption and electron-shuttling properties. Additionally, applied in the development of biosensors and environmentally responsive smart materials.