Abstract
Photodynamic Therapy (PDT) is a promising treatment for the different heath areas, associated to microorganism inactivation and tumor treatment. Due to the low cost, methylene blue (MB), a phenothiazine molecule has been widely used as a photosensitizer in Brazil. The other phenothiazine dyes have been barely studied, such as Azure A, Azure B and Dimethyl-methylene blue, however they can …