Fig. 4

Our synthesized Zn-photoprotoporphyrin and photoprotoporphyrin were dissolved in 5% albumin solution and excited with 400-nm light. Fluorescence emitted by synthetic porphyrin derivatives at wavelengths of 587.5, 625.5, and 664.0 nm. We concluded that the 587.5-nm fluorescence was from albumin, the 625.5-nm fluorescence was from Zn-photoprotoporphyrin, and the 664.0-nm fluorescence was from photoprotoporphyrin