نبذة مختصرة : This study aimed to use digital image processing to evaluate the antifungal activity of essential oils (EOs) from Blepharocalyx salicifolius (Myrtaceae), Nectandra grandiflora (Lauraceae), Nectandra megapotamica (Lauraceae) and Piper gaudichaudianum (Piperaceae) on wood decay fungi. A white-rot fungus, Trametes versicolor, and a brown-rot fungus, Gloeophyllum trabeum, were selected. The EOs were extracted by hydrodistillation and chemically characterized by gas chromatography coupled to mass spectrometry (GC-MS). The antifungal activity of the EOs was evaluated by the Petri plate diffusion test. The inhibition verification was calculated with the aid of digital image processing, using ImageJ software. The predominant compounds of the B. salicifolius and P. gaudichaudianum extractives were eucalyptol and dillapiol, respectively. For the species of Nectandra, bicyclogermacrene was the most representative constituent of the N. megapotamica EO, whereas dehydrofuquinone was the major constituent of the EOs from N. grandiflora leaves and fruits. The highest growth inhibition of T. versicolor was caused by N. megapotamica EO. The highest inhibition percentages of G. trabeum were provided by P. gaudichaudianum and B. salicifolius extractives. Digital image processing was an effective tool for the accurate analysis of fungal growth. ; A busca por produtos naturais que possam substituir preservantes da madeira sintéticos é crescente. Dentre estes produtos, estão os óleos essenciais (OEs). Portanto, o objetivo deste estudo foi avaliar a atividade antifúngica dos OEs de Blepharocalyx salicifolius, Nectandra grandiflora, Nectandra megapotamica e Piper gaudichaudianum, sobre os fungos apodrecedores de madeira Trametes versicolor e Gloeophyllum trabeum. Os OEs foram extraídos por hidrodestilação e foram caracterizados quimicamente. A atividade antifúngica dos OEs foi avaliada pelo teste de difusão em placas de Petri. A verificação da inibição foi calculada com auxílio do software ImageJ®. Os componentes majoritários dos OEs de ...
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