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Fig. 1 | BMC Cancer

Fig. 1

From: Observation of Zn-photoprotoporphyrin red Autofluorescence in human bronchial cancer using color-fluorescence endoscopy

Fig. 1

Chemical structures of porphyrin derivatives examined in the present study. Protoporphyrin (PP-H) is converted to photoprotoporphyrin (PPP-H) via 1,4-addition of oxygen to the vinyl substitute. Zn-protoporphyrin (Zn-PP) is converted to Zn-photoprotoporphyrin (Zn-PPP) via 1,4-addition of oxygen to the vinyl substitute. In vitro reported fluorescence wavelengths are 630 nm for PP-H, 664 nm for PPP-H, 585 nm for Zn-PP, and 625 nm for Zn-PPP

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BMC Cancer

ISSN: 1471-2407

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