意大利永久花的生理活性和芳疗功效

意大利永久花(Immortelle,Helichrysum italicum)

  菊科(Asteraceae)蜡菊属(Helichrysum)

  学名:Helichrysum italicum

  中文名:意大利永久花、意大利蜡菊

  属名Helichrysum来自于希腊语的“helios”和“chryos”,分别代表太阳和黄金的意思,因此属植物的花序常呈现金黄色#2。永久花是30-70公分的芳香灌木#3,带有咖喱味#4,在5-6月开黄花#5。意大利永久花因生长在地中海流域不同地区的差异,还能再细分6个亚种#6,法国科西嘉岛上的永久花品种主要有亚种microphyllum(H.italicum ssp.microphyllum)和italicum(H.italicum ssp.italicum)两种#6-7。

【生理活性】

  即便品种相同,精油主成分仍有差异。亚种microphyllum来自意大利萨丁尼亚岛、希腊的克里特岛和法国科西嘉岛。克里特岛的主成分为β-桉叶烯(β-selinene,16.7-17.1%)和γ-姜黄烯(γ-curcumene,6.6-13.7%),萨丁尼亚的是乙酸橙花酯(neryl acetate,17.6-56.1%),科西嘉岛上的乙酸橙花酯含量经检测普遍较高(41.5-55.7%)#8-9。#7

  来自科西嘉的亚种italicum主成分同样是乙酸橙花酯(15.8-42.5%),次要成分有意大利酮I(11.0%)或是γ-姜黄烯(0.8-13.6%),其它栽种地区还包括希腊、意大利托斯卡尼或厄尔巴岛,精油成分都不太一样#7。

  有一些只存在于意大利永久花的特殊酮类成分#10,例如意大利酮(italidione)和其它β-双酮(β-diketone)类成分,过去文献纪载有意大利酮I(4,6,9-trimethyldec-8-en-3,5-dione,5.5–11.0%)、意大利酮II(2,4,6,9-tetramethyl-8-decene-3,5-dione)#41、4,6-dimethyloctan-3,5-dione(0.2–2.4%)和意大利酮III(可能是3,5,7,10-tetramethylundec9-en-4,6-dione)#1-2,11。这些分子以抗血肿闻名,所以永久花也有“芳疗里的山金车”(super arnica of aromatherapy)称号,预期对皮肤退红、血栓和瘀伤也有疗效#7,12。(ps山金车能消血肿)

民俗疗法

  希腊哲人和植物学家泰奥弗拉斯托斯(Theophrastus)在其著作“Historia Plantarum”描述永久花(Heleiochrysos)(和蜂蜜混合)能治疗烧烫伤以及有毒动物的叮咬#13。古籍纪录常使用属名,因此无法得知确切的品种,希腊医生Pedanius Dioscorides于西元40-70年撰写的作品“De Materia Medica”,里头纪载蜡菊属植物的花丝(filaments)酒浸泡液有治疗泌尿系统不适、蛇咬、疝气、坐骨神经痛和利尿等功效#14。文艺复兴时期,荷兰植物学家Herman Boerhaave认为蜡菊属植物能缓解焦虑和歇斯底里#15。

  意大利永久花对于呼吸道和皮肤的过敏或发炎皆有帮助#16-17。由于它的促进结瘢特性,所以能帮助皮肤再生以及伤口愈合#7。特别的是,即便早期临床试验尚未普遍,意大利永久花精油在治疗伤口愈合、血肿、伤疤或皮肤相关疾病的评价依然让人折服,并未遭遇任何挑战或质疑#6,18。

抗氧化

  多样的黄酮类成分构成永久花的抗氧化力,体外研究#19发现能抑制脂质的过氧化、消除自由基并展现抗氧化活性。银锻苷(tiliroside)和arzanol都是其中拥有显著抗氧化功效的活性成分#19-20。

抗菌

  实验证明,意大利永久花精油和乙醚萃取物可有效抑制金黄色葡萄球菌的生长,即便是有抗药性的菌株,抑制力也无差别#21-22,抗菌机转可能是因为萜烯或黄酮类成分和微生物细胞膜作用,破坏细胞功能和结构#21,23。

  此外,根据Lorenzietal的研究#24,永久花精油和其成分香叶醇(geraniol)能提高抗生素在抗药性微生物的抑菌力,实验显示在精油或香叶醇存在情形下,氯霉素(Chloramphenicol)对抗药性产气肠杆菌(E.aerogenes)、绿脓杆菌和鲍氏不动杆(A.baumannii)抑制效果明显提升;氨苄青霉素、青霉素和诺氟沙星等抗生素对产气肠杆菌的最低抑菌浓度也大幅下降。

  精油也可抑制白色念珠菌#25,从研究推测主要应是类萜和含氧成分发挥它们的抗菌功效#25-26。

光保护和预防晒后红斑

  暴露在UVB光前先涂抹意大利永久花黄酮萃取物的豚鼠或人皮肤,能有效减少UVB引起的红斑、皮肤温度和刺痛,实验显示前24小时效果最佳,之后随时间渐低,且除了能过滤UVB,也有很强的过滤UVA能力#27。作者觉得这萃取物应能应用在治疗烧烫伤、辐射防护或防晒产品配方中。

抗发炎

  外用整株意大利永久花的有机溶剂萃取物能减少小鼠因化学毒物诱发的耳朵肿胀#28,丁醇萃取物效果最好,之后依序是甲醇、乙酸乙酯、己烷以及二氯甲烷的萃取物。作者结论指出这些抗发炎功效也许是多种作用机转表现的结果,包含抑制促进发炎酵素活性、自由基消除力和类似肾上腺皮质素(corticoids)的消炎机转。

  根据先前研究基础,作者持续纯化可能的有效成分,实验显示来自多种萃取物的纯物质,包含苯乙酮、吡喃葡萄糖苷和黄酮类等成分皆有抗发炎的表现,例如4-hydroxy-3-(2-hydroxy-3-isopentenyl)acetophenone、12-hydroxytremetone-12-O-β-D-glucopyranoside、3-(2-hydroxyethyl)acetophenone-4-O-β-Dglucopyranoside、maltol-β-DO-glucopyranoside、鼠麴草黄素(gnaphaliin)、乔松素(pinocembrin)和银锻苷(tiliroside)等#19,29-30。

术后修复

  胸部整形术后,口服亚种serotinum永久花精油2滴每日2次持续10天,之后涂擦10%精油持续2-3个月,能有效减少局部发炎、肿胀、瘀伤与血肿#6,31。

可能风险

  果蝇和酵母菌实验显示,永久花精油在实验中最大使用浓度0.3%下未观察到明显的基因损伤#32-33,反而还有部分减少突变的功效#33。一般认为长期使用意大利永久花精油都是安全的,只有一位69岁老太太使用永久花乳液舒缓皮肤干痒时产生过敏#34,经进一步检测确认是永久花萃取物引起,但作者再找10位志愿者测试,并未发生过敏,所以仅是个案,实际上永久花在动物试验反而是有抑制接触性皮肤炎的效果#35-36。

  永久花精油不会引发光刺激性#37。虽然有研究外用100%的意大利永久花精油在芳香疗法上,这可能反映它的高安全性,然而一般并不建议这样使用,更何况永久花还有潜在神经毒性的疑虑#6。为避免有些人可能产生皮肤刺激,永久花精油建议使用在皮肤的最高浓度应低于0.5%#38。

【芳疗功效】

  Clinical Aromatherapy的作者Jane Buckle偶尔会使用未稀释的永久花治疗皮肤瘀伤,都能获得不错效果,可是目前没有相关研究支持#10。

  1:1混合意大利永久花和欧洲南木蒿-高天蓝烃品种(Artemisia arborescens-high chamazulene)精油,再使用椰子油稀释至10%涂擦于辐射治疗后的伤口一天数次,有助于伤口愈合、预防发炎或感染。使用含1:1混合意大利永久花和摩洛哥蓝艾菊(Tanacetum annuum)精油的喷雾水(2ml/2ml/112ml)喷于患部,能有效减少皮肤刺激#39。

  持续1周吸闻含有胡椒薄荷、甜罗勒和意大利永久花的复方精油,14位自觉疲惫的受测者经治疗后,认为能有效大幅减少疲劳感#10,40。

后记

  为了找出意大利酮的分子结构,几乎花掉一整个下午……写完后好奇用「4,6,9-trimethyldec-8-en-3,5-dione」和「意大利酮」搜寻网页,结果这篇似乎是第一个写出意大利酮分子结构的网络中文资料?!!

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  作者:cofactor412

  • 发表于 2022-09-26 17:40:14
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