Nanostructured AABB Zn (II) Phthalocyanines as Photodynamic Agents for Bacterial Inactivation

Irene Paramio, Ainhoa Salazar, Mireia Jordà-Redondo, Santi Nonell, Tomás Torres, Gema de la Torre

Research output: Indexed journal article Articlepeer-review

1 Citation (Scopus)


In this work, the ability of amphiphilic Phthalocyanine (Pc) photosensitizers (PS) (Zn(II)Pcs PS1, PS2, and PS3) to assemble into cationic nanoparticles in water and to photo-inactivate bacterial strains is demonstrated. All the synthesized Zn(II)Pcs exhibit an AABB functionalization pattern, having a binaphthyloxy-linked bisisoindole (AA) functionalized at the chiral binaphthol core with branched (PS1) or linear (PS2 and PS3) poly-ammonium chains, and two non-functionalized isoindole rings (BB). The aggregation behavior and the stability of the nanoparticles formed by the three PS in water is studied by UV–vis, fluorescence and circular dichroism (CD) spectroscopies, and their shape and size is determined by transmission electron microscopy (TEM) and dynamic light scattering (DLS). The PS nanoparticles prove efficient in the photoinactivation of S. aureus and E. coli. Although PS2 and PS3 present better photophysical features in their monomeric form (i.e., improved singlet oxygen quantum yield), PS1 is more effective in killing both types of strains, especially the gram-negative E. coli. This observation may derive from the low stability found for PS1 nanoparticles, which easily disassemble after binding to the bacteria surface, recovering the photophysical properties of the non-aggregated species.

Original languageEnglish
Article number2300116
Number of pages10
JournalAdvanced Therapeutics
Issue number11
Publication statusPublished - Nov 2023


  • amphiphiles
  • nanoparticles
  • photodynamic inactivation
  • phthalocyanines
  • self-assembly


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