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BaCkground: The oral aspect is considered to be most convenient for administration of drugs to patients.Currently,a novel oral colon-specific drug delivery system(OCDDS)has been exploring as one of the site-specific drug delivery system.There were a few strategies to achieve colonic specificity,such as bacterially triggered and pH-sensitivity OCDDS.Graphene oxide(GO),a two-dimensional(2D)carbon nanomaterial,possesses abundant hydrophilic oxygenated functional groups which enable GO to be functional through covalent or non-covalent approaches[1,2].