Evaluation of antifungal properties of octyl gallate and its synergy with cinnamaldehyde

The objective of this study was to investigate the possibility of using octyl gallate by itself or with organic biocides as a preservative against wood decay fungi. Antifungal activities of three antioxidants, propyl gallate, octyl gallate and butylated hydroxyltoluene (BHT) were tested against four wood decay fungi including Lenzites betulina, Trametes versicolor, Gloeophyllum trabeum, and Laetiporus sulphureus. Octyl gallate was found to be the only active compound with IC50 values of 0.47 mM, 0.16 mM, 0.24 mM and 0.04 mM against L. betulina, T. versicolor, G. trabeum and L. sulphureus, respectively. A synergistic effect was also found when octyl gallate is combined with cinnamaldehyde. Results obtained herein demonstrated that octyl gallate by itself exhibited an excellent antifungal property and enhanced protection was further observed by combining it with cinnamaldehyde.