Differences in the Essential Oils from Different Ages of Platycladus orientalis
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Abstract:
Essential oils were extracted from three Platycladus orientalis woods of different ages by supercritical fluid extraction, and the differences in the extraction rate, sensory characteristics, composition, and antimicrobial efficacy of the three essential oils were studied. The results indicated that an older P. orientalis could yield a higher extraction rate of platycladus orientalis (up to 9.98%), and the flavor of the essential oil was stronger and mellower. Gas chromatography-mass spectrometry was used to analyze the components of the essential oils, and the results showed that older P. orientalis had higher contents of the main active ingredients, including thujopsene, cedrol, and cuparene. The minimum inhibitory concentration (MIC) method was employed to compare the antimicrobial activities of the three essential oils. The result revealed that older P. orientalis had a lower MIC value, and the MIC values against four bacteria (Staphylococcus aureus, Lactobacillus, Escherichia coli, and Salmonella) all reached 0.05 mg/mL, showing a strong antimicrobial activity. This experimental result shows that the aging time of P. orientalis wood has an important influence on the favor, content, oil composition, and function of the essential oil, and the essential oil of older P. orientalis has a higher application value.
