Durability of rubberwood (Hevea brasiliensis) treated with peppermint oil,eucalyptus oil,and their main components |
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| Authors: | Narumol Matan Weerapong Woraprayote Warasri Saengkrajang Niphaphorn Sirisombat Nirundorn Matan |
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| Institution: | 1. Food Technology, School of Agricultural Technology, Walailak University, Thasala District, Nakhon Si Thammarat 80160, Thailand;2. Materials Science and Engineering, School of Engineering and Resources Management, Walailak University, Thasala district, Nakhon Si Thammarat 80160, Thailand;1. Lyles School of Civil Engineering, Purdue University, West Lafayette, IN 47907, USA;2. ISISE, University of Minho, Department of Civil Engineering. Campus of Azurém, Guimarães, Portugal;3. Grupo de Construcción, Centro de Innovación Tecnológica en Edificación e Ingeniería Civil (CITEEC), E.T.S. Ingenieros de Caminos, Canales y Puertos, Universidade da Coruña, Campus de Elviña, s/n, 15071 A Coruña, Spain;1. Dept. of Wood & Furniture Design and Technology, Research Lab WST, TEI of Thessaly, 43100 Karditsa, Greece;2. Dept. of Forest Biology & Wood Protection Technology, Forestry Faculty, Istanbul Univ., 34473 Istanbul, Turkey;3. Dept. of Forestry & Natural Environment, Lab of Wood & Wood Products, TEI of Drama, Drama 66100, Greece;1. Research and Science Branch, Islamic Azad University, Tehran, Iran;2. Karaj Islamic Azad University, Karaj, Iran;3. Research & Development Department, Nanozino Co., Tehran, Iran;4. Dept. of Pathobiology, Faculty of Veterinary Sciences, Islamic Azad University, Science and Research Branch, Tehran, Iran;5. Nanosystems Research Team (NRTeam), ABRII, Karaj, Iran |
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| Abstract: | Anti-fungal activities of two essential oils (peppermint oil and eucalyptus oil) and their main components (menthol and eucalyptol, respectively) against molds (Aspergillus niger, Penicillium chrysogenum, and Penicillium sp.) and a white-rot decay fungus (Trametes versicolor) identified from rubberwood surfaces were investigated. The broth dilution method and the agar diffusion technique were employed to determine the minimal inhibitory concentration (MIC) and the minimal fungicidal concentration (MFC) using the concentration of substances between 100 and 800 μl ml?1. Inhibitory effects of essential oils and their main components at the MICs against mold growth, fungal decay, and termite attack on rubberwood were further examined by means of the dip treatment method. It was found that MFC values against molds for all treatments examined were about 50–100 μl ml?1 higher than MIC values. Peppermint oil and menthol exhibited high fungistatic and fungicidal activities, with MICs of 300 μl ml?1 and 350 μl ml?1, respectively, against the test molds and the decay fungus. Eucalyptus oil and eucalyptol were also effective against these microbes but at higher concentrations of 600 μl ml?1 and 500 μl ml?1, respectively. Only peppermint oil at the MIC was capable of providing a complete protection from mold growth on rubberwood for up to 12 weeks at storage conditions of 25 °C and 100% RH. Both peppermint oil and eucalyptus oil at the MICs showed moderate resistance to fungal decay and high resistance to termite attack. |
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