Natural products to control biofilm on painted surfaces

S. BOGDAN; C. DEYÁ; O. MICHELONI; N. BELLOTTI; R. ROMAGNOLI

PIGMENT & RESIN TECHNOLOGY

EMERALD GROUP PUBLISHING LIMITED

Año: 2018 vol. 47 p. 180 - 187

0369-9420

PurposeThis paper aims to study five vegetables extracts as possible additives to control bacterial growth on indoor water-borne paints. The extracts used were obtained from the weeds Raphanus sativus, Rapistrum rugosum, Sinapis arvensis, Nicotiana longiflora, Dipsacus fullonum, used in traditional medicine as antimicrobial compounds.Design/methodology/approachFourier transform infrared spectra and UV-Vis spectrophotometry with Folin Denis reagent were used to characterize the extracts. Antibacterial activity against Escherichia coli and Staphylococcus aureus was also determined. Afterwards with selected extracts, water-borne paints were formulated, prepared and evaluated against S. aureus biofilm formation employing environmental scanning electron microscopy.FindingsThe results show that, in general, the tested paints were efficient in inhibiting biofilm formation especially that formulated with Nicotiana longiflora.Practical implicationsThe tested paints can be used to protect walls form microbial colonization that shortened the useful life of the coating by discoloration and degradation, besides indoor microbial colonization could be diminished. This is especially important in places that should have high standards of environmental hygiene as in the food industry, health-care and sanitary centers.