“…), 274,279 O 2 -equivalent, H 2 and CO 2 gases, and microbial community, 280,281 beyond imaging, 282 temperature monitoring, 283 pressure, 284 and drug delivery units. 285 Regarding materials for manufacturing this kind of device, some essential components can be highlighted, such as structural materials and packaging, materials for electronic components, logic devices, communications and power sources, as reported by Bettinger, C. 286 For encapsulation, some substances are considered generally recognized as safe (GRAS), such as gelatin, cellulose, zinc oxide, and metallic iron, among others. Polymers, ceramics, pigments, metals, and minerals are also classified as GRAS and can be used in encapsulation as well as device electronics.…”