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. 2013 Aug 2;2(3):591–606. doi: 10.3390/cells2030591

Table 1.

Fluorescence properties of endogenous molecules.

Endogenous fluorophore Excitation Emission Fluorescence lifetime τ (ns) [10]
Elastin 415 475–575 0.2–2.5
FAD ~450 525–550 5.2
Keratin 277 450–500 1.6
NAD(P)H 360 450–460 0.3/2.3
PPIX [3] ~400 635 11
Retinol 351 ~500 -