Calcium benzoate Calcium benzoate Calcium benzoate refers to the calcium salt of benzoic acid. When used in the food industry as a preservative, its E number is E213 (INS number 213); it is approved for use as a food additive in the EU, USA and Australia and New Zealand. The formulas and structures of calcium carboxylate derivatives of calcium and related metals are complex. Generally the coordination number is eight and the carboxylates form Ca-O bonds. Another variable is the degree of hydration. It is preferentially used more than other benzoic acid salts or its esters in foods due to its better
Calcium imaging dye in all cells or selectively in certain cellular subtypes. GECIs have been used in the studies of neuron, T-cell, cardiomyocyte, etc. Regardless of the type of indicator used the imaging procedure is generally very similar. Isolated cells loaded with an indicator or expressing it in the case of GECI, can be viewed using a fluorescence microscope and captured by a Scientific CMOS (sCMOS) camera or CCD camera. Confocal and two-photon microscopes provide improved sectioning ability so that calcium signals can be resolved in micro domains or (for example) synaptic boutons. Images are analyzed by measuring fluorescence intensity changes for