Antibacterial casein-based ZnO nanocomposite coatings

In a recently published study, casein-based ZnO nanocomposite were prepared via double in situ polymerisation, where y-(2,3-epoxypropoxy) propytrimethoxysilane (KH560) was used as silane coupling agent.

Milk drops spray from a glass
Neat casein film often suffers from poor water resistance and unexpected antibacterial activity. Source: manolofranco / Pixabay. -

Morphology, structure and size distribution of the composite latexes were characterised by TEM, FTIR, DLS, TG. Meantime, water absorption and antibacterial properties of the as-prepared composite coatings were also investigated. The results indicated that the average size of casein-based ZnO nanocomposite particles was approximately 259 nm. When dosage of ZnO precursor was increased to 3%, water resistance of the composite film was maximised in that water absorption rate was reduced to 49.9%.

A good candidate for functional coatings

When dosage of KH560 was 3.5%, the E. coli inhibition zone of casein-based ZnO nanocomposite was expanded from 0 mm to 9.0 mm, suggesting obviously enhanced antibacterial performance than that prepared via single in situ method. The as-prepared composite is a good candidate for functional coatings in relative fields.

The study is published in: Progress in Organic Coatings Volume 134, September 2019, Pages 40-47.

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