FFN270 hydrochloride, a fluorescent tracer of norepinephrine, is a fluorescent substrate of the norepinephrine and vesicular monoamine transporters. FFN270 hydrochloride exhibits two resolved absorption/excitation maxima depending on solvent pH (FFN270 ex: 320 nm or 365 nm, em: 475 nm) and can function as ratiometric fluorescent pH-sensors.
FFN270 enables both an examination of noradrenergic microanatomy and an observation of synaptic activity in the cortex of intact neuronal circuits in vivo[1].
References:
[1]. Matthew Dunn, et al. Designing a norepinephrine optical tracer for imaging individual noradrenergic synapses and their activity in vivo. Nat Commun. 2018 Jul 19;9(1):2838.