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Adsorption of N-methylacetamide and L-arginine onto apatitic phosphates

AuthorsGarcía-Ramos, José Vicente ; Carmona, Pedro
Issue Date1981
PublisherNational Research Council Canada
CitationCanadian Journal of Chemistry 59: 222-226 (1981)
AbstractThe adsorption of N-methylacetamide and of L-arginine on apatitic phosphates has been studied by infrared spectroscopy. During the initial adsorption, the bands of adsorbed N-methylacetamide indicate the presence of the trans form attached to surface cations via the carbonyl group. The position of the amide I band is found to give a linear correlation with q/r for apatitic cations (where q is the charge and r the radius of a cation). At higher amounts of adsorbed amide, hydrogen bonding arises either from the self-association of amide molecules or from the binding of these to the surface phosphate anions. L-Arginine can be adsorbed through the groups containing NH bonds or through the carboxyl group. Infrared spectra of calcinated samples as well as the Ca/P ratio determinations point out that a substitution of L-arginine positive ions for surface cations takes place upon adsorption of this amino acid on apatitic calcium phosphate. © 1981
Identifiersissn: 0008-4042
Appears in Collections:(CFMAC-IO) Artículos
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