GAST and gastroenteritis: Data on additional characterizations of the reagents, such as FITC fluorescent and FT-IR spectra of SiO2 and SiO2-NH2, analysis of gastrin-SiO2 microspheres and detection of serum gastrin by mass spectrometry, measurement of serum markers of colon cancer and intestinal inflammation, H&E staining and analysis of the biocompatibility of gastrin-SiO2 microspheres are shown in the Supplemental Material.