Perylene diimide–Cu2+ based fluorescent nanoparticles for the detection of spermine in clinical and food samples: a step toward the development of a diagnostic kit as a POCT tool for spermine

EA-PDI∩Cu²⁺ complex can be established as cost-effective method to develop diagnostic kit for POCT of spermine for real time detection of spermine in vapor and solution form released from fermented food samples.