| Summary: | 碩士 === 弘光科技大學 === 化妝品科技研究所 === 99 === Previously we studied forty-five kinds of essential oils from an Australian company and compared their antioxidant activities. In order to explore the sources of essential oils for functional foods and their applications in cosmetic products, herein, we have extended our studies by analyzing the antioxidant activities and the major chemical components of an additional twenty-five kinds of essential oils from Germany.
This study was to examine the in vitro antioxidant and antimicrobial activities of twenty-five commonly used essential oils and their major components by gas chromatography-mass spectrometry (GC-MS). In the total phenolic contents (TPC) and trolox equivalent antioxidant capacity (TEAC), ajowan essential oil is the best among these essential oils, the major chemical component was carvacrol. In the DPPH free-radical scavenging assay (DFRS) and reducing power (RP), cinnamon bark extra and anis extra essential oils are the best two among these essential oils, the major chemical components were eugenol and anethole, respectively. In the ferric thiocyanate (FTC) and β-carotene bleaching assays (BCB), oregano essential oil is the best among these essential oils, the major chemical component was thymol. In the metal chelating activity (MC) and hydroxyl radical scavenging assay (HR), frankincense and bay laurel essential oils are the best two among these essential oils, the major chemical components were terpineol and terpene components, respectively.
In the disk-diffusion method (DDM) and minimum inhibitory concentration (MIC), cinnamon bark extra essential oil was the best completely inhibited Escherichia coli and Staphylococcus aureus among these essential oils, the DDM and MIC were 18.67, 13.67 mm and 3.13, 6.25 mg/mL, respectively.
It is clearly that the phenolic compounds in essential oils attributed a positive correlation with TPC, TEAC, DFRS, RP, FTC, BCB and antimicrobial assays. To test the stability, the essential oils were added into the cosmetics and those showed stable, non-perishable and good antioxidant activity. It can bring new opportunities of beauty cosmetics in the market.
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