Electrochemical detection of food preservative SO₂ in red wine using SiO₂ coated CdS nanomaterials

Abstract

Cadmium sulfide is an important chalcogenide semiconductor nanoparticle prepared by reverse micelle method using cetyltrimethylammonium bromide (CTAB), surfactant. Toxic CdS is coated with silica using tetraethyl orthosilicate (TEOS) precursor and are well characterized. SiO₂ provides a sufficient contrast to show the core homogeneously surrounded by the silica shell. The coating can be made thicker by the addition of TEOS resulting in monodispersed silica spheres with CdS core. SO₂ is the most important chemical (as preservative and antioxidant) used to prevent wine oxidation. CdS@SiO₂ is serving as adsorbent for the detection of SO₂ in wine. The detection mechanism and the sensitivity of the method were validated using limit of detection and the limit of quantification values which are determined from differential pulse voltammetric technique. This electrochemical sensing is found to be simple and reliable to detect the free SO₂ present in the wine sample.

GRAPHICAL ABSTRACT

Keywords:

• Core/shell nanomaterials
• silica coated CdS
• SO₂ detection
• electrochemical sensor
• red wine

Disclosure statement

No potential conflict of interest was reported by the authors.