Determination of 2,4-diaminotoluene by a bionanocomposite modified glassy carbon electrode

• This work describes the development of a modified glassy carbon electrode (GCE) for the selective determination of 2,4-diaminotoluene (TDA), a primary aromatic amines (PAAs) that can be formed in food packaging materials including aromatic polyurethane (PU) adhesives. The electrode's surface was modified with multi-walled carbon nanotubes (MWCNTs), MWCNTs in chitosan (CS), and gold nanoparticles (AuNPs). The highest current response was achieved with AuNPs/MWCNTs-CS/GC electrodes, which exhibited an oxidation peak of 9.87 μA by cyclic voltammetry (CV), compared with 1.39 μA of the bare GCE. A detection limit of 35 nM was estimated by amperometry experiments. The oxidation of TDA was strongly dependent on the pH of the medium, having maximum sensitivity at pH ∼ 7. From a mechanistic point of view, the diffusion coefficient of TDA (D = 6.47 × 10−4 cm2 s−1) and the number of electrons (n ≈ 2) involved in the catalytic oxidation of TDA at the surface of the AuNPs/MWCNTs-CS/GCE were determined. The practical utility of this nanocomposite modified electrode was demonstrated by migration studies from conventional food packaging materials. 

Subject headings

NATURVETENSKAP  -- Kemi (hsv//swe)

NATURAL SCIENCES  -- Chemical Sciences (hsv//eng)

Keyword

2

4-Diaminotoluene (TDA)

Chitosan

Electrochemical nanosensor electrode

Gold nanoparticle

Multi-walled carbon nanotube

Primary aromatic amine

Adhesives

Amines

Aromatic compounds

Aromatization

Catalytic oxidation

Cyclic voltammetry

Glass

Gold nanoparticles

Metal nanoparticles

Multiwalled carbon nanotubes (MWCN)

Oxidation

Packaging machines

Packaging materials

Yarn

Food-packaging materials

Maximum sensitivity

Modified electrodes

Modified glassy carbon electrode

Number of electrons

Primary aromatic amines

Selective determination

Glass membrane electrodes

Publication and Content Type

ref (subject category)

art (subject category)