Difluorinated H2S probe 1 is a fluorescent probe for hydrogen sulfide (H2S).1It selectively fluoresces in the presence of H2S over Zn2+, Fe3+, S2O32-, ClO-, SO32-, H2O2, NO2-, cysteine (Cys), homocysteine (Hcy), and glutathione (GSH) when used at a concentration of 1 μM. Difluorinated H2S probe 1 displays excitation/emission maxima of 365/450 nm, respectively. 1.Zhang, J., Gao, Y., Kang, X., et al.o,o-Difluorination of aromatic azide yields a fast-response fluorescent probe for H2S detection and for improved bioorthogonal reactionsOrg. Biomol. Chem.15(19)4212-4217(2017)
Melanin probe-1, an 18F-picolinamide-based PET probe, is utilized for PET imaging of malignant melanoma. It demonstrates remarkable tumor targeting efficacy, superior tumor imaging contrasts, favorable biodistribution profiles, and robust in vivo stability.
Melanoma is a lethal skin cancer. The early detection of melanoma using positron emission tomography (PET) probes is critical for improving the survival of melanoma patients. Melanin probe-2 is a non-radioactive bromo-picolinamide precursor that has been used for the synthesis of18F-picolinamides based PET probe (melanin probe-1). The tumor-targeting efficacy and imaging property of three melanin probes were evaluated in B16F10 tumor-bearing mice.18F-1 and18F-3 had much lower tumor uptake compared with18F-2 (Melanin probe-2), which were 12.74 ± 1.70, 16.61 ± 2.60, and 16.87 ± 1.23 %ID g at 0.5, 1, and 2 h, respectively[1].