Figure 2.

pH-stimulated cargo release. (a) Schematic illustration of the process of gastric acid neutralization by magnesium micromotor in vivo and pH measurement by microelectrode pH meter. (b) The pH values in the stomachs of mice after different doses of Mg micromotor were given. (n = 3) (c) Twenty minutes after mice were injected with deionized water, Mg micromotors and inert polystyrene (PS) particles, superimposed fluorescent images of the whole stomach of mice were collected (both Mg micromotors and PS microparticles were loaded with DiD dye and encapsulated in a pH-sensitive polymer shell). Reproduced with permission from the publisher of corresponding reference [45].