Antibacterial mechanism for inactivation of E. Coli by AgNPs@polydoamine/titania nanotubes via speciation analysis of silver ions and silver nanoparticles by cation exchange reaction

摘要: Abstract In this method, silver nanoparticles (AgNPs) were anchored on titania nanotubes (TNT) surface by chelation of polydopamine (PD) to generate an AgNPs@polydopamine/titania (TPAS). To reveal the antibacterial mechanism TPAS, a speciation analysis ion (Ag+) and AgNPs was developed based cation exchange reaction (CER). Owing only Ag+ can Cd2+ in CdTe quantum dots (QDs), realized via detecting for indirect but ultrasensitive detection hydride generation (HG)-atomic fluorescence spectrometer (AFS). The limit detections (LODs) 0.0001 ng mL−1. Relative standard deviations (n = 7) are better than 2.2% at concentration 0.02 ng mL−1 Ag+. Due strategy, trace assay accurately detected. results show TPAS predominantly contributed bactericidal action contact-killing. Ag+, released from synergistically increased activity release-killing. proposed method has been successfully utilized inactivation E. Coli explore mechanisms AgNPs.