What question did this study set out to answer?

The study aims to assess the efficacy of first- and second-generation photosensitizers in photodynamic therapy through monitoring tryptophan degradation.

July 11, 2026Journal of Innovative Optical Health Sciences0 citationsOpen Access

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Evaluation of the efficacy of first- and second-generation photosensitizers by optical monitoring of tryptophan degradation

ABA. Babajanyan AAA. Andreasyan NAN. Kh. Alchujyan

Key Points

The study aims to assess the efficacy of first- and second-generation photosensitizers in photodynamic therapy through monitoring tryptophan degradation.
Examined photobleaching of tryptophan and stability of photosensitizers in laser-irradiated aqueous solutions.
Monitored characteristic absorptions using UV-visible spectrophotometry.
Compared six different photosensitizers through statistical analysis.
First-generation Zn-5,10,15,20-tetra(4-N-allylpyridyl)porphine and second-generation sulfonated Al-phthalocyanine showed no significant difference in reactive oxygen species formation rates (p > 0.05).
Both photosensitizers exhibited high stability under irradiation.
Aqueous solutions of tryptophan and photosensitizers serve as an effective selection system for evaluating photosensitizer efficacy.

Abstract

The effectiveness of photosensitizers (PSs) is the most important aspect of photodynamic therapy (PDT) of cancer. To evaluate that, the photobleaching of tryptophan (Trp) and the stability of PSs in laser-irradiated aqueous solutions of PSs and Trp were studied by monitoring their characteristic absorptions. Among the six photosensitizers studied, the first-generation photosensitizer Zn-5,10,15,20-tetra(4-N-allylpyridyl)porphine and the second-generation photosensitizer sulfonated Al-phthalocyanine belong to the same top-performing statistical tier, with no significant difference in reactive oxygen species formation rates (p > 0.05) and exhibit high stability under irradiation. Aqueous solutions of Trp and PSs provide a simple and reliable system for selecting the most effective PSs using UV-visible spectrophotometry.

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Cite This Study

Babajanyan et al. (Thu,) studied this question.

synapsesocial.com/papers/6a51df9fc18d7f28ca50098e https://doi.org/https://doi.org/10.1142/s1793545826500239

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