“…The CaCO 3 NPs used to fortify the food matrices were obtained from AA red eggshells from chickens ( Gallus gallus domesticus ) according to the methodology described by Gómez-Álvarez et al [ 11 ], by combining high shear scattering and ultrasound. The characteristics of the CaCO 3 NPs used were the following: particle size of 281.34 ± 25.83 nm; polydispersity index of 0.51 ± 0.05; zeta potential of −22.4 ± 3.47; 33.48 % Ca; an irregular shape observed by scanning electron microscopy (SEM) with a size between 45 nm and 280 nm; crystals in the range of 10–60 nm observed by transmission electronics (TEM); porous and polycrystalline nature; and a surface area of 11.13 m 2 /g and 98.7 % calcite.…”