To achieve homogeneous dispersion of graphenes and strong interfacial bonding simple one step amine-functionalization of the pristine graphenes was performed via treating them in a solution of 4-aminobenzoic acid
and polyphosphoric acid.
We purchased BT, HQ, and CT from Wako Pure Chemical Industries (Osaka, Japan); catalase from Boehringer-Mannheim (Mannheim, Germany); 4-aminobenzoic acid
hydrazide (ABAH) from Tokyo Chemical Industry (Tokyo, Japan); and methionine and sodium hypochlorite (NaOCl) from Nacalai Tesque (Kyoto, Japan).
The monosaccharides are pre-column derivatized with 4-aminobenzoic acid
ethyl ester by reductive amination to a secondary amine which absorbs at 306 nm.
It has also concluded that existing data on the approved use of 4-aminobenzoic acid
as a sunscreen needs reviewing, because much existing dossier information does "not confirm to current standards and guidelines".