Determination and analysis of singlet oxygen quantum yields of talaporfin sodium, protoporphyrin IX, and lipidated protoporphyrin IX using near-infrared luminescence spectroscopy

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In photodynamic therapy (PDT), singlet oxygen (\(^{1}\textit {O}_{2}\)) is the main species responsible for promoting tumor cell death. The determination of the quantum yield (ΦΔ) of a photosensitizer (PS) is important for dosimetry. The purpose of this paper is to quantify the \(^{1}\textit {O}_{2}\) generated by the PS by near-infrared spectroscopy (NIRS). The ΦΔ of different PS species were measured by the detection of near-infrared \(^{1}\textit {O}_{2}\) luminescence. From the measurement results, the ΦΔ of talaporfin sodium, protoporphyrin IX (PpIX), and lipidated PpIX (PpIX lipid) were measured as 0.53, 0.77, and 0.87, respectively. In addition, the ΦΔ values of PpIX in a hypoxic and oxic solution were evaluated, since tumors are associated with regions of hypoxia. The measured ΦΔ indicated a same value at high (DO: 20%) and low (DO: 1%) oxygen concentrations. Using the measured ΦΔ, the amount of \(^{1}\textit {O}_{2}\) generated by the PSs was estimated using [\(^{1}\textit {O}_{2}\)] = D*ΦΔ, where D* is the total excited PS concentration. The generated \(^{1}\textit {O}_{2}\) amounts were little different at the high and the low oxygen concentrations, and the generated \(^{1}\textit {O}_{2}\) amount for each PS was different depending on each ΦΔ. The NIRS measurement determined the ΦΔ of talaporfin sodium, PpIX, and PpIX lipid. The quantitative evaluation based on the measured ΦΔ will support the development of PDT treatment monitoring and design.

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Correspondence to Takahiro Nishimura.

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Nishimura, T., Hara, K., Honda, N. et al. Determination and analysis of singlet oxygen quantum yields of talaporfin sodium, protoporphyrin IX, and lipidated protoporphyrin IX using near-infrared luminescence spectroscopy. Lasers Med Sci (2019) doi:10.1007/s10103-019-02907-0

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  • Singlet oxygen generation quantum yield
  • Near-infrared luminescence spectroscopy
  • Photosensitizers