原料介紹｜澳洲尤加利 (Eucalyptus australia)

▎精油簡介

澳洲尤加利(Eucalyptus radiata)，又稱為桉樹或俗稱孤獨樹，它是澳洲木本植物中代表性的樹種，一般為常綠喬木，數高達30m，整體樹形成金字塔狀，樹皮為灰色纖維狀，葉片較薄，葉子通常互生，有柄，全緣羽狀脈，多為鐮刀形；枝、葉、花有芳香；早春開白色、紅色或黃色花，多為繖形或頭狀花序。同屬的尤加利樹由於適應澳洲各種不同的地理氣候，其覆蓋率遍及整個澳洲。

因生長速度很快，對水的需求量較大。因為尤加利樹的經濟價值與種植成活率較高，澳洲東部的30至50種尤加利樹，為澳洲的代表樹種，也是無尾熊的主要食物，看到尤加利就很自然地想到無尾熊抱吃的畫面。

尤加利樹本身帶有的揮發性芳香油是許多蚊蟲不喜歡的味道，是含氧率很高的一種精油，對於淨化空氣，清潔呼吸系統都有十分顯著的效果。

▎成分解析

｜主要成分：氧化物

澳洲尤加利含有高比例氧化物(1,8-桉油醇)，同時還含有單萜醇、單萜烯、單萜酮等其他分子結構，所產生的協同作用具有一定醫療價值，如：α-蒎烯，檸檬烯，α-萜品醇，順式胡椒醇，牻牛兒醇等。

｜成分1：1.8-桉油醇 (1,8 cineole)

尤加利具有高含量的1,8-桉樹腦，商業上可用於製藥和化妝品工業中的精油生產。且被廣泛種植用於紙漿，膠合板和實木的生產，其葉子芳香油具有令人震驚的廣泛生物活性。

｜成分2：右旋萜品烯-4-醇(Terpinen-4-ol)

要特別注意放置太久的萜品烯-4-醇會氧化成香荊芥酚，具皮膚刺激性。

｜原料認證

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▎參考文獻

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18. Ács K, Balázs VL, Kocsis B, Bencsik T, Böszörményi A, Horváth G. Antibacterial activity evaluation of selected essential oils in liquid and vapor phase on respiratory tract pathogens. BMC Complement Altern Med. 2018 Jul 27;18(1):227.
19. Yang C, Hu DH, Feng Y. Antibacterial activity and mode of action of the Artemisia capillaris essential oil and its constituents against respiratory tract infection-causing pathogens. Mol Med Rep.2015 Apr;11(4):2852-60.
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