Tetramethylrhodamine methyl ester perchlorate (TMRM Perchlorate CAS 115532-50-8) is a fluorescent probe targeting mitochondrial membrane potential ( m) It is designed to selectively accumulate in mitochondria enabling detection and analysis of mitochondrial function TMRM Perchlorate exerts its biological activity by permeating cells and accumulating within the mitochondria in response to the inner membrane potential gradient Its fluorescence intensity is directly correlated with m In cell-based studies TMRM Perchlorate is commonly used in the characterization and isolation of cardiomyocytes differentiated from embryonic stem cells and in models investigating mitochondrial dysfunction particularly in cardiovascular and metabolic disease research Based on these properties TMRM Perchlorate holds research potential in monitoring mitochondrial health assessing cellular energetics and studying disease-related mitochondrial dysfunction