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Densitometric analysis (from an SDS-PAGE analysis) of halloysites with adsorbed BSA. H, HC, HA, and HAC correspond to commercial HNT, HNT with chitosan physically adsorbed (HC), HNT with grafted APTES (HA), and HNT with grafted APTES (later modified with chitosan using glutaraldehyde as linker) (HAC), respectively [91].
