Abstract
The green synthesis of a Zn-abietate complex obtained from Pinus Elliottii resin exhibiting outstanding antibacterial properties is reported. The synthesis method used resin from Pinus from reforestation, and an aqueous solution of ZnSO4 at a mild temperature (80 °C), without the use of organic solvents, thus giving a green character and with an antibacterial action to the compound. Spectroscopic, analytical, morphological, and structural characterization were consistent with an octahedral complex involving three carboxylate ligands per metal ion. The complex exhibits good thermal stability for practical applications. XPS results confirmed the presence of zinc atoms with oxidation state Zn2+. Colorimetric measurements expressed by the CIE L*a*b* method showed values characteristic of a slightly yellowish white pigment. The antibacterial efficiency was evaluated using the JIS Z 2801: 2010 standard, for 10% and 20% (w/w) of Zn-abietate in commercial white paint, leading to high inhibition (>99.99%) against Staphylococcus aureus and Escherichia coli. Because of its high antibacterial efficiency, the pigment has a great potential to be explored in paints for home and hospital environments.
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