DDMAB, or didodecyldimethylammonium bromide, is a cationic surfactant widely utilized in various industrial and research contexts. As a member of the quaternary ammonium compounds family, it features a positively charged head and a hydrophobic tail, enabling its function as a detergent, emulsifier, and antimicrobial agent. Known for its ability to disrupt cell membranes, DDMAB is frequently employed in microbiology for the selective isolation and identification of bacteria. In nanotechnology, it is used for synthesizing metal nanoparticles and other materials. Additionally, DDMAB's interactions with cell membranes and its ability to penetrate them highlight its potential applications in drug delivery, gene therapy, and other medical fields.