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Structures of compounds used for microbubble filling gas and stabilizing shell. Perfluorocarbon gases are often used to improve bubble stability because of their lower solubility in water. Common shell stabilizers include phospholipid and polymer surfactants. DPPA = 1,2-dipalmitoyl-sn-glycero-3-phosphate; DPPC = 1,2-dipalmitoyl-sn-glycero-3-phosphocholine; DSPC = 1,2-dipalmitoyl-sn-glycero-3-phosphocholine; DSPE = 1,2-distearoyl-sn-glycero-3-phosphoethanolamine.
