Fig. 7: Chemical structures of chosen calcium sensors and graphical representation of intensometric, ratiometric and pseudo-ratiometric sensors.
From: Combining nitric oxide and calcium sensing for the detection of endothelial dysfunction
a Chemical formulae of a selection of published molecular probes for calcium ions:161,162,163,164,165,166,192,193,194,195. b Calcium chemosensors based on the BAPTA chelating unit167,168,169,170; c Calcium ions sensors that are excited by, or emit, red light171,172,173,180; d Chemical formulae of a selection of ratiometric chemosensors 38, 39176. e–g Typical emission spectra of e an intensometric Ca2+ chemosensors, f a ratiometric Ca2+ chemosensors, and g a pseudo-ratiometric chemosensors, upon gradual addition of calcium ions.
