Journal
PHOTODIAGNOSIS AND PHOTODYNAMIC THERAPY
Volume 37, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.pdpdt.2021.102705
Keywords
Benzothiazole; Quaternary; Photophysics; Photodynamic therapy; Singlet oxygen; Quantum yield
Categories
Funding
- Department of Science and Technology (DST) Innovation and National Research Foundation (NRF) , South Africa through DST/NRF South African Research Chairs Initiative for Professor of Medicinal Chemistry and Nanotechnology [UID 62620]
- Rhodes University
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The synthesis, photophysicochemical properties, and photodynamic therapy activities of benzothiazole substituted zinc phthalocyanine compounds were investigated. The importance of asymmetry and positive charge for high triplet and singlet oxygen yields was demonstrated. Nanohybrids formed by linking the compounds to B doped detonation nanodiamonds showed improved photodynamic therapy activity.
The synthesis, photophysicochemical and photodynamic therapy (PDT) activities of benzothiazole substituted zinc phthalocyanine (Pc): 1 (asymmetrically substituted and composed of no charges), 2 (asymmetrically substituted and composed of three positive charges), and 3 (symmetrically substituted and composed of four positive charges), are presented. The triplet and singlet oxygen quantum yields were highest for complex 2 showing the importance of asymmetry and charge. The complexes are covalently and non-covalently linked to B doped detonation nanodiamonds (B@DNDs) to yield nanohybrids (B@DNDs-1, B@DNDs-2, B@DNDs-3). The presence of B@DNDs, asymmetry and positive charge resulted in improved PDT with the lowest cell viability being observed for B@DNDs-2 at 5%. The cell viability ranged from 5% to 7% for the nanohybrids compared to 19-26% for Pcs alone.
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