Acaricidal Effects of Thai Herbal Essential Oils against Dermatophagoides pteronyssinusC. Veeraphant, V. Mahakittikun and N. Soonthornchareonnon*,
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Twenty four herbal essential oils and reference standards were examined for acaricidal activity against Dermatophagoides pteronyssinus (Dp) house dust mites at 24/48 h. The results show that at a 0.1% concentration level of clove bud oil, cinnamon leaf oil, jasmine ABS, and hairy basil oil can kill 100% of Dp within 10 min. The active essential oils of clove bud, cinnamon leaf, turmeric, jasmine, betel vine and lemongrass showed LC50 values (24 h) of 0.0026, 0.0041, 0.0069, 0.0079, 0.0091 and 0.0091 ml/ml, respectively. The chemical compositions of the active essential oils were analyzed using Gas Chromatography-Mass Spectroscopy (GC-MS), and the major components were also tested for acaricidal activity. In addition, the active essential oils were examined for preliminary toxicity using the brine shrimp (Artemia salina Leach) lethality test (BST). However, the LD50 values of the toxicity of these oils were not relative to acaricidal activities.
Keyword:
Acaricidal activity, House dust mite, Thai herbal essential oils
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