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Title: Borneol: Antimicrobial and Antibacterial Applications and Mechanistic Insights

不同植物精油中龙脑的含量分布及抗菌活性特征

不同植物精油中龙脑的含量分布及影响因素

不同植物精油中龙脑的含量分布及影响因素

龙脑(borneol)作为一种具有抗菌活性的含氧单萜类化合物,广泛存在于多种植物精油中,其含量因植物种类、品种、提取方法、生长阶段、采收时间及环境处理等因素存在显著差异。

一、不同植物精油中龙脑的含量分布

多种植物精油中已检测到龙脑成分,且含量差异较大,具体分布如下表所示:

主要植物精油中龙脑的含量分布

植物种类/部位/处理 龙脑含量(%) 备注 参考文献
欧蓍草(Achillea millefolium L.) 12.4 精油主要成分之一 [1]
百里香属T. satureioides 0 < % < 27.7 含量范围 [2]
百里香属T. pallidus 1.4 < % < 25.6 含量范围 [2]
百里香属T. satureioides Coss 21.56 精油成分 [3]
百里香属T. satureioides Coss水提取物(HE) 25.04 高于精油(21.56%) [3]
H. chrysotricha 32.7 精油主要成分之一 [4]
薰衣草(Lavandula sp.) 5.34 中等含量成分 [5]
苍耳(Xanthium strumarium) 11.6 精油主要成分之一 [6]
长梗南五味子(Kadsura longipedunculata) 6.05 精油成分 [6]
菊蒿(Achillea odorata subsp. pectinata) 11.33 主要含氧单萜成分 [7]
欧蓍草(Achillea coarctata)茎精油 7.4 茎部位含量 [8]
欧洲艾蒿(Artemisia herba-alba) 3.3 精油成分 [9]
桉属植物EO 3 5.80((+)-龙脑) 可能与环境相关 [10]
薄荷属Satureja macrosiphonia(Poldokhtar地区) 16.60 采集地点差异 [11]
薄荷属Satureja macrosiphonia(Kabirkooh地区) 8.20 采集地点差异 [11]
百里香属Thymus satureioides 18.1 精油成分 [12]
精油分馏组分(RF=0.4) 10.52 分馏富集 [13]
樟科植物(可能为肉桂或类似) 2.67 精油成分 [13]
某植物水溶胶 20.4 是精油中(5.0%)的4倍 [14]
蒿属Artemisia chamaemelifolia(Kandovan种群开花前) 13.50 生长阶段差异 [15]
普通艾蒿(Artemisia vulgaris)叶精油 8.06 叶部位含量 [16]
益智A11、A12品种 无显著差异 合成乙酸龙脑酯和樟脑的前体 [17]
迷迭香(Rosmarinus officinalis)超临界CO₂提取 18.79 提取方法差异(高于HD的8.52%、OM的3.75%) [18]
迷迭香(Rosmarinus officinalis) 10.39 精油成分 [19]
迷迭香(Rosmarinus officinalis) 7.7 精油成分 [20]
墨西哥刺木(Poliomintha barbatus) 20.7 第二大成分 [21]
薰衣草(Lavandula angustifolia) 8.29 与桉叶素、樟脑共同为主要成分 [22]
薰衣草(Lavandula angustifolia)叶状茎精油 13.0–19.7 部位含量范围 [23]
薰衣草(L. angustifolia) 4.2 品种差异(低于杂交品种lavandin的6.1%) [24]
薰衣草花精油(某批次) 0.41 批次差异 [25]
薰衣草(LA)2019年 15.67 年份差异(2020年为19.35%) [26]
柠檬桉(Corymbia citriodora) 22.6(内型龙脑) 精油成分 [27]
桉属植物 2.9 精油成分 [28]
百里香属Thymus satureioides 34.26 主要成分之一 [29]
百里香属Thymus satureioides 21.2 精油成分 [30]
摩洛哥百里香(T. maroccanus) 0.2~16.3 盛花期后叶片达16.3% [31]
百里香属 1.44 精油成分 [32]
百里香属Thymus algeriensis 23.48 精油成分 [33]
百里香属不同部位 0.7–4.7 部位含量范围 [34]
百里香属T. satureioides 25.10 精油成分 [35]
伊朗杂交薰衣草(L. x intermedia) 17.11–26.14 含量范围 [24]
犹太蒿(Artemisia judaica) 5.72(内型龙脑) 精油成分 [36]
蒿属植物 2.3~8.1 含量范围 [37]
土耳其A. gypsicola(花后全株) 22.62 生长阶段差异 [38]
蒿属植物 6.1 精油成分 [39]
Artemisia aucheri种子 检测到 种子精油成分 [40]
Artemisia aragonensis 13.20 精油成分 [41]
牛至(Origanum vulgare subsp. glandulosum)营养生长早期 2.38 生长阶段差异(晚期和花期未检测到) [42]
牛至精油OEO1 1.35 不同OEOs中最高(0.26–1.35%) [43]
药用鼠尾草(S. officinalis) 7.6 与反式侧柏酮、樟脑共同为主要成分 [44]
百里香属Thymus satureioides 合计43.9%(与α-松油醇) 主要成分组合 [45]
牛至(Origanum vulgare L.) 6.52 与香芹酚、邻伞花烃共同为主要成分 [46]
蒿属植物(可能为Artemisia sp.) 6.2 樟脑烷衍生物合计占30.0% [47]
Teucrium argyrophyllum var. argyrophyllum花 12.0 部位差异(茎为15.0%) [48]
Teucrium argyrophyllum var. argyrophyllum茎 15.0 部位差异(花为12.0%) [48]
薄荷属/类似植物 2.11 精油成分 [49]
蒿属/类似植物 2.34 精油成分 [50]
樟科/类似植物 6.9 与樟脑、桉叶素共同为主要成分 [51]
牛至属/类似植物 3.1 精油成分 [52]
樟科/类似植物 15.0 与桉叶素、甲基丁香酚共同为主要成分 [53]
菊科/类似植物 2.11 精油成分 [49]
唇形科/类似植物 26.2 与乙酸龙脑酯、莰烯共同为主要成分 [54]
唇形科/类似植物(Cobar Peneplain生物区) 31.7 环境差异 [55]
菊科/类似植物 花期降低 生长阶段差异 [56]
马郁兰相关精油 1.9 精油成分 [57]
Marrubium cristata subsp. phrygia 26.9、31.4、39.3 所有样品均为主要成分 [58]
艾纳香(Artemisia argyi) 58.7 mg/g 精油含量(单位:mg/g) [59]
Cupressus ornifolia 2.9 精油成分 [28]
Poldokhtar精油 7.1 精油成分 [60]
A. grandifolia 5.2 精油成分 [61]
T. macrophyllum 9.1 精油成分 [61]
药用鼠尾草(S. officinalis)海拔100 m 5.0 海拔差异(500 m为4.5%) [62]
E. fimbriobracteata 8.1 精油成分 [63]
T. parthenium叶片 2.9 叶片精油成分 [64]
T. punctatum叶片 2.1 叶片精油成分 [64]
S. veneris 6.2 精油成分 [65]
S. pachystachys 含龙脑成分 与spathulenol共同形成抑菌带 [66]
精油分馏组分IV 62.3 分馏富集(含量最高) [67]
Thymus polium冬季样品 8.24 季节差异(秋季未检测到) [68]
Teucrium arduini地上部干物质 5.4 精油成分 [69]
某植物精油 10.8 精油成分 [70]
Xylopia hypolampra茎皮 7.8 茎皮精油成分 [71]
Gori和Jord品种 0.6–14.6 品种含量范围 [72]
Satureja bachtiarica Bunge 13.4 精油成分 [73]
某植物精油 主要含樟脑、龙脑等 检测到51种挥发性成分 [74]
精油SlEO-3 较高 含量较高 [75]
二、龙脑含量的影响因素

龙脑含量受多种因素综合调控,具体如下:

  1. 植物种类与品种:不同植物及品种的龙脑含量差异显著,如H. chrysotricha精油中龙脑含量高达32.7%[4],而薰衣草精油中仅为5.34%[5];益智A11和A12品种的龙脑含量无显著差异[17]
  2. 植物部位与处理:同一植物不同部位含量不同,如Teucrium argyrophyllum var. argyrophyllum花精油龙脑含量为12.0%,茎精油为15.0%[48];分馏处理可富集龙脑,如某精油分馏组分IV中龙脑含量达62.3%[67]
  3. 提取方法:不同方法提取的龙脑含量差异显著,如迷迭香精油中超临界CO₂提取法的龙脑含量(18.79%)高于水蒸气蒸馏法(8.52%)和有机溶剂法(3.75%)[18];微波辅助水蒸气蒸馏法(MAHD)提取的Satureja macrosiphonia精油龙脑含量高于其他方法[11]
  4. 生长阶段与采收时间:植物生长阶段影响龙脑积累,如Artemisia chamaemelifolia Kandovan种群开花前龙脑含量最高(13.50%)[15],牛至营养生长晚期和花期未检测到显著龙脑含量[42]
  5. 环境与地理因素:地理环境导致含量差异,如Satureja macrosiphonia精油中龙脑含量在Poldokhtar地区为16.60%,Kabirkooh地区为8.20%[11];Cobar Peneplain生物区采集的唇形科植物精油龙脑含量高达31.7%[55]
  6. 对映体组成:龙脑的对映体组成随季节略有变化,某植物精油中(S)-型为主要对映体[14]
三、龙脑含量与抗菌活性的关联

龙脑是植物精油抗菌活性的重要贡献者,其含量与抗菌活性存在一定关联:

  • 欧蓍草花部精油因龙脑含量更高,抗菌和抗真菌活性强于叶片[1]
  • 百里香属T. satureioides和T. pallidus精油中龙脑含量变化显著影响抗菌活性[2],T. satureioides Coss水提取物(龙脑25.04%)对革兰氏阳性和阴性菌株均有强抗菌作用[3]
  • H. chrysotricha精油(龙脑32.7%)对革兰氏阳性菌具有强抑制作用,且与链霉素具有协同抗菌潜力[4]
  • 苍耳精油(龙脑11.6%)对金黄色葡萄球菌等的MIC值低至0.5±0.1 µg/mL[6]
  • 含高龙脑的精油(如26.2%、31.7%)可通过损伤细菌细胞膜、细胞壁等发挥抗菌作用,MIC值低至5 mg/mL[54][55]
  • 龙脑与其他成分(如α-松油醇、樟脑)协同可增强抗菌活性,如Thymus satureioides精油中两者合计占43.9%,对多种细菌的MIC值为2–4 µL/mL[45]

综上,龙脑在植物精油中的含量分布受多因素调控,且其含量与精油抗菌活性密切相关,为龙脑的开发利用提供了理论基础。

龙脑对革兰氏阳性菌和革兰氏阴性菌的抗菌活性特征

龙脑:抗菌应用及机制解析——不同植物精油中龙脑的含量分布及抗菌活性特征

一、不同植物精油中龙脑的含量分布

龙脑作为含氧单萜类化合物,广泛存在于多种植物精油中,其含量因植物种类、产地、部位、生长阶段及提取方法而异。不同科属植物精油中龙脑的含量分布及相关特征如下表所示:

不同科属植物精油中龙脑的含量分布及特征

科属分类 植物种类 龙脑含量/特征 参考文献
唇形科 Thymus satureioides Tata和Azrou产地种群含量最高,分别为41.3%、31.7%;其他种群含量为21.2%、25.10%、27%、18.1%、34.26% [76][77][30][35][12][29]
Thymus maroccanus 0.2%~16.3%,花后期叶片含量达16.3% [31]
Thymus leptobotrys 2.7% [67]
普通百里香 1.44% [32]
Thymus属某植物 0.7%~4.7% [34]
Thymus polium 冬季采收含量为8.24%,秋季未检测到 [68]
Lavandula angustifolia 8.29%(第三大优势成分);叶状茎精油13.0%~19.7%;LA 2019/2020为15.67%/19.35%;与杂薰衣草精油含量分别为4.2%/6.1% [22][23][26][24]
薰衣草栽培品种(‘Alba’等) 含量高于L. angustifolia [78]
Satureja lavandulifolia 1%~8% [79]
Rosmarinus officinalis 26.48%(首要成分);10.39% [80][19]
Rosmarinus beesianus 15.0%(第二大主要成分,仅次于1,8-桉叶素47.6%) [53]
Salvia officinalis 5%~4.5%(100m海拔含量高于500m);7.6%(第三丰富成分) [62][44]
Salvia veneris 6.2% [65]
Satureja pachystachys 活性组分中占68.9% [66]
Satureja montana 主要成分之一(与γ-松油醇、香芹酚共为主要成分) [81]
Satureja macrosiphonia 主要含氧单萜之一,微波辅助水蒸馏(MAHD)法含量高于传统水蒸馏(HD)法 [11]
Teucrium arduini 地上部分干燥材料精油含量为5.4% [69]
Teucrium argyrophyllum var. argyrophyllum 花精油12.0%,茎精油15.0%,均为主要成分之一 [48]
菊科 Artemisia judaica endo-龙脑含量5.72%(主要成分之一) [36]
Artemisia属多种植物(A. annua等) 2.3%~8.1% [37]
Artemisia gypsicola 花后期含量达22.62% [38]
Artemisia属某植物(类型III) 2.6% [82]
Artemisia属某植物 6.1%;10.8%;13.20% [39][70][41]
Achillea millefolium 印度德里种群含量12.4%(主要成分之一);可通过柱层析分离得到 [1][83]
Achillea coarctata 茎精油含量7.4%(主要成分之一) [8]
Artemisia vulgaris 叶精油含量8.06%(主要成分之一) [16]
Artemisia canescens 6.9%(主要成分之一) [51]
Tanacetum parthenium 2.9%,开花期含量较前期降低 [64][56]
其他科属 Combretum spp.(使君子科) 叶提取物中相对丰富,与桉叶素等抗菌单萜共存 [84]
Curcuma wenyujin(姜科) PJH精油典型成分之一 [85]
Satureja satureioides 12.4%(第三大优势成分) [86]
Xylopia hypolampra(番荔枝科) 茎皮精油含量7.8% [71]
Xanthium strumarium(菊科) 11.6%(主要成分之一) [6]
Helenium chrysotricha(菊科) 优势成分,含量高达32.7% [4]
茄属植物(SlEO-3) 含量较高,以(-)-对映异构体为主 [75]
Origanum vulgare L.(唇形科) 6.52%(第二大主要成分,仅次于香芹酚50.26%) [46]
二、龙脑对革兰氏阳性菌和革兰氏阴性菌的抗菌活性特征

龙脑的抗菌活性具有菌株选择性,且常与精油中其他成分协同发挥作用,其对革兰氏阳性菌的敏感性显著高于革兰氏阴性菌。

革兰氏阳性菌的敏感性:龙脑对革兰氏阳性菌抑制活性较强,纯龙脑的MIC为0.05~3.2 mg/ml[87]。含龙脑的精油对多种革兰氏阳性菌表现出显著抑制作用,如Thymus satureioides精油对S. aureus的MIC为0.25%[86],对M. luteusB. cereus的抑菌圈直径大于20 mm[12]Satureja pachystachys精油对S. aureus的MIC为1.25 mg/mL[66]Artemisia gypsicola精油对革兰氏阳性菌的抑菌圈直径达37.3 mm[38]Xanthium strumarium精油对S. aureus的MIC为0.5±0.1 μg/mL[6]。此外,龙脑与其他成分的协同作用可增强抗菌活性,如迷迭香精油中龙脑与樟脑、马鞭草酮协同抑制无害李斯特菌[88],温郁金PJH精油中龙脑与桉叶素、樟脑协同提升抗菌活性[85]

革兰氏阴性菌的抑制活性:龙脑对革兰氏阴性菌的活性相对较弱,但仍具有一定作用。纯龙脑对K. pneumoniae的MIC为0.47 mg/L[89];含龙脑的精油如Achillea millefolium分离龙脑对E. coli的MBC为2.5±0.08 μg/mL[83]Xanthium strumarium精油对K. pneumoniae的MIC为4.8±0.0 μg/mL[6]。部分研究显示龙脑与其他成分协同可增强对革兰氏阴性菌的活性,如Artemisia属提取物中富含龙脑的YSF组分对H. pylori的MIC为0.08 mg/mL,强于YE组分的0.14 mg/mL[90]

协同作用与机制:龙脑的抗菌活性常依赖与其他成分的协同,如Satureja lavandulifolia精油中龙脑与桉叶素、樟脑协同[79]Satureja pachystachys精油中龙脑与spathulenol协同[66]。其抗菌机制可能与形成氢键的能力有关[41],且被偏最小二乘法(PLS)模型确定为与精油抗菌活性相关的重要化合物(VIP>1)[85]。此外,季节、采收部位及提取方法等因素会通过影响龙脑含量调控精油抗菌效力,如Thymus polium冬季精油龙脑含量高且抗菌活性强于秋季[68]Achillea millefolium花部精油龙脑含量高于叶部且抗菌活性更强[1]Satureja macrosiphonia MAHD法提取精油龙脑含量更高且抗菌活性更强[11]

三、小结

龙脑广泛存在于唇形科、菊科等多科属植物精油中,含量差异显著(0.2%~41.3%),且对革兰氏阳性菌的抑制活性强于革兰氏阴性菌。作为精油抗菌活性的关键贡献者,龙脑不仅自身具有抗菌活性,还常与其他成分协同增强效力,其含量受植物种类、生长阶段、提取方法等因素调控,进而影响精油的抗菌效力。此外,龙脑对真菌(如白色念珠菌)和酵母菌也具有抑制活性[91][75],且在耐药菌株(如MRSA、ESBL阳性菌)感染防治中展现出潜力[84],为其在食品防腐、临床抗感染等领域的应用提供了理论依据。

龙脑在精油抗菌作用中的协同效应与独立贡献

龙脑:抗菌及抑菌应用与机制研究——不同植物精油中龙脑的含量分布及抗菌活性特征——龙脑在精油抗菌作用中的协同效应与独立贡献

龙脑作为含氧单萜类化合物,广泛存在于多种植物精油中,其含量因植物种类、提取部位、产地及萃取方法而异,且含量差异可能直接影响精油的抗菌活性特征[76][92][18][93][57][28][33][94][23][25][95][54][1][4]。不同植物精油中龙脑的含量分布如下:

不同植物精油中龙脑的含量分布

植物种类/精油类型 龙脑含量 补充说明 参考文献
百里香属植物(Thymus satureioides)精油 0.3%–41.3% Tata产地(41.3%)、Azrou产地(31.7%),为仅次于香芹酚的主要成分 [76]
四翅崖柏(Tetraclinis articulate)精油 14.83% 第三丰富的单萜衍生物,仅次于樟脑(28.48%)和乙酸龙脑酯(18.91%) [92]
迷迭香精油(超临界CO₂萃取物) 18.79% 含量最高 [18]
迷迭香精油(有机溶剂萃取物OM) 3.75% 含量最低 [18]
粘叶鱼藤(D. viscosa)叶精油 9.3% 第二丰富的成分 [93]
Algerian百里香(T. algeriensis)精油 23.48% 与芳樟醇、莰烯等共同构成主要成分 [33]
C. urucurana茎皮精油 14.7% [94]
樟科植物(C. ornifolia)精油 2.9% [28]
桉树精油 检出 [96]
薰衣草相关精油(LVO) 1.9% 含量较低 [57]
薰衣草花精油 0.41% [25]
Lavandula angustifolia叶状茎精油 13.0–19.7% [23]
鼠尾草属植物精油 2.12–18.38% [95]
某未明确植物精油 26.2% [54]
千叶蓍(A. millefolium L.)精油 12.4% 主要成分为桧烯(17.5%)、1,8-桉叶素(13%)、龙脑(12.4%)等 [1]
H. chrysotricha精油 32.7% 最主要成分,其次为芳樟醇(7.5%)、甲酸异龙脑酯(5.4%)和α-松油醇(4.8%) [4]

此外,植物部位差异也会影响龙脑含量及抗菌活性:千叶蓍花部精油因樟脑、龙脑和α-杜松醇含量更高,其抗菌和抗真菌活性强于叶部精油[1]

龙脑的抗菌活性已得到多项研究证实,其对革兰氏阳性菌、革兰氏阴性菌及真菌的抑制作用机制包括:作为亲脂性化合物插入细菌细胞膜,改变膜通透性导致细胞内容物泄漏[76][92];与异亮氨酰-tRNA合成酶(PDB ID: 1JZQ)结合,干扰细菌蛋白质生物合成[97];在某些精油体系中诱导微生物细胞内活性氧(ROS)过量产生[91]。具体活性特征如下:对单核细胞增生李斯特菌(L. innocua)的抑菌圈为1–2 mm,最低抑菌浓度(MIC)为5 mg/ml[88];仅对金黄色葡萄球菌(S. aureus)、粪肠球菌(E. faecalis)等革兰氏阳性菌有活性,对革兰氏阴性菌无明显抑制作用[98];亚抑菌浓度下可抑制细菌黏附能力及毒力因子表达[99]。含量较高的龙脑往往与更强的抗菌活性相关,例如H. chrysotricha精油因高含量龙脑对革兰氏阳性菌表现出强烈抑制作用[4];化学计量学分析指出,S. kitaibelii精油11月样品的抗菌活性主要由龙脑、匙叶桉油烯醇、石竹烯氧化物和柠檬烯共同贡献,且比例对活性至关重要[100]

龙脑在精油抗菌作用中常与其他成分协同发挥功效:百里香精油的抗菌活性与香芹酚、百里酚、龙脑等的协同作用相关[76];四翅崖柏精油的抗菌活性归因于樟脑、乙酸龙脑酯、α-蒎烯和龙脑的共同作用[92];C. ornifolia精油中龙脑与樟脑、α-葑醇等含氧单萜协同增强抑制效果[28];D. viscosa叶精油中龙脑与乙酸龙脑酯等协同,对多种微生物的MIC范围为0.101 mg/mL至3.25 mg/mL[93];T. algeriensis精油中龙脑与香芹酚协同,对革兰氏阳性菌的MIC < 0.5 µL/mL,对革兰氏阴性菌的MIC为1 µL/mL[33];龙脑与芳樟醇共同对精油混合物的抗菌效果负责[101];Lavandula angustifolia精油中龙脑与其他成分对金黄色葡萄球菌的协同作用指数(FICI)低至0.076[23];薰衣草精油中龙脑等成分与恩诺沙星联用的协同作用占比达82.35%[25];H. chrysotricha精油与链霉素具有协同抗菌潜力[4]。这些协同作用可能与龙脑与其他萜类、醇类成分共同破坏细胞膜结构、干扰细胞代谢通路有关[91][102]

然而,龙脑的抗菌活性强度受含量及精油整体组成影响:纯化合物测试中,龙脑对金黄色葡萄球菌的抑制效果与水芹烯、樟脑相当[99],但弱于香芹酚、莰烯[103];迷迭香精油抗李斯特菌活性筛选中,龙脑抑制效果弱于马鞭草酮、樟脑、乙酸龙脑酯[88];当龙脑含量较低时(如LVO中1.9%),对整体抗菌活性的贡献相对有限[57];部分精油中因龙脑浓度低,直接贡献较小[98]

综上,龙脑作为植物精油中的常见活性成分,通过直接破坏细胞膜、干扰蛋白质合成等机制发挥抗菌作用,并与其他萜类、酚类成分协同增强精油整体抗菌活性。其含量分布的多样性及抗菌机制的复杂性,为植物精油在食品防腐、临床抗感染等领域的应用提供了理论依据。

龙脑抗菌作用的潜在机制(膜破坏与分子相互作用)

龙脑:抗菌应用及机制研究进展

一、不同植物精油中龙脑的含量分布

龙脑作为含氧单萜类化合物,广泛存在于多种植物精油中,其含量因植物种类及产地而异。百里香属(Thymus)植物精油中龙脑为重要次要或主要成分,其他植物精油中也存在不同程度分布。主要植物精油的龙脑含量如下:

不同植物精油中的龙脑含量分布

植物精油(来源) 龙脑含量 备注 参考文献
普通百里香样品精油 0.3%~41.3% - [76]
摩洛哥Tata产Thymus satureioides精油 41.3% 主要成分(仅次于香芹酚) [76]
摩洛哥Azrou产Thymus satureioides精油 31.7% 主要成分(仅次于香芹酚) [76]
Thymus vulgaris精油 76.42% 最主要成分 [97]
Artemisia aragonensis精油 13.20% - [41]
EOBD(植物未明确)精油 11.07% - [104]
I. graveolens精油 26.2% 与乙酸龙脑酯(43.3%)为主要成分 [54]
CbEO(植物未明确)精油 较低 或与抗菌活性不足相关 [91]
二、龙脑的抗菌活性特征

龙脑是植物精油发挥抗菌活性的重要分子。百里香属植物精油的抗菌活性与酚类、萜类化合物(含龙脑、香芹酚、百里酚等)密切相关[76]Artemisia aragonensis精油中的龙脑被认为是其对革兰氏阳性菌(如B. subtilisS. aureus)和革兰氏阴性菌(如E. coli)发挥显著抗菌作用的关键成分之一[41]

龙脑单独或协同其他成分对耐药菌及真菌有效:EOBD精油中龙脑(11.07%)与芳樟醇、桉树脑等协同,对耐抗生素S. aureus(抑菌圈直径36.40±1.70 mm,MIC 10.78±1.28 μg/mL)和P. aeruginosa表现良好抗菌活性,对C. albicans的抑菌圈直径达36.79±1.35 mm,MIC为15.32±1.47 μg/mL[104]CbEO中的龙脑也具有抗念珠菌和抗真菌活性[91]。此外,龙脑在亚抑菌浓度(MIC/2)下仍能抑制细菌对惰性底物的黏附,并降低可溶性毒力因子表达[99]

三、龙脑抗菌作用的潜在机制

龙脑的抗菌机制主要涉及细胞膜破坏和分子相互作用:细胞膜破坏是核心机制,I. graveolens精油(含26.2%龙脑)处理S. aureus后,透射电镜显示细菌细胞膜内陷、细胞壁增厚、细胞质密度降低聚集,最终导致细胞死亡[54],这可能与其脂溶性特征相关——脂溶性分子易穿透细胞壁和细胞膜,改变多糖、脂肪酸及磷脂结构,破坏膜通透性[104]。分子相互作用方面,龙脑可通过形成氢键增强对革兰氏阳性菌的活性[41],还可能诱导微生物细胞内活性氧(ROS)过量产生[91];分子对接研究显示,包括龙脑相关倍半萜(如β-石竹烯)在内的萜类成分对异亮氨酰-tRNA合成酶(PDB ID: 1JZQ)结合亲和力较高(-6.8~-7.0 kcal/mol),可能通过抑制细菌蛋白质合成关键酶发挥作用[97]

综上所述,龙脑在多种植物精油中广泛分布,含量差异显著影响精油抗菌活性;其抗菌机制涉及细胞膜破坏、氢键形成及酶活性抑制等层面,为新型抗菌剂开发提供了重要理论依据。

龙脑与其他成分的协同抗菌作用及影响因素

龙脑与其他成分的协同抗菌作用及影响因素

龙脑(borneol)是一种广泛存在于多种植物精油中的双环单萜醇,单独使用时抗菌活性较弱(如对大肠杆菌的最低抑菌浓度(MIC)为0.5 μl/ml[105],对多种细菌仅表现出弱抑制作用[106]),但与其他抗菌成分或抗生素组合时可产生显著协同效应,其机制可能与破坏细菌细胞膜、抑制外排泵活性有关——龙脑可穿透细菌膜并降低外排泵功能,从而提升低浓度强抗菌成分(如萜品烯-4-醇、柠檬烯、蒎烯、香芹酮、丁子香酚)的作用效果[107]

不同植物精油中龙脑的相对含量

植物精油来源 龙脑相对含量 文献来源
A. setacea 32.97% [107]
H. chrysotricha 32.7% [4]
M. communis L. 27.15% [108]
D. graveolens 18.7% [109]
L. angustifolia 13.0–19.7% [23]
T. satureioides 未明确具体含量 [110]
S. kitaibelii 主要成分之一 [100]
一、龙脑与单萜类成分的协同作用

龙脑与单萜类化合物的协同作用主要通过破坏细菌细胞膜结构、促进龙脑或其他成分进入细胞实现。例如,γ-萜品烯和α-萜品烯可破坏细胞膜脂质双分子层导致脂质泄漏,从而增强龙脑的抗菌效果[106];T. satureioides精油中的龙脑通过与香芹酚、百里香酚的协同效应,显著增强对细菌的生长抑制[110];S. kitaibelii精油中龙脑与柠檬烯、斯巴醇、石竹烯氧化物的比例是影响其11月采收样品抗菌活性的关键因素[100]

二、龙脑与抗生素的协同作用

龙脑所在的精油与抗生素组合时也常表现出协同效应。例如,D. graveolens精油(含18.7%龙脑)与氯霉素组合时,60.0%的测试组合表现出协同作用,对奇异变形杆菌(P. mirabilis ATCC 12453)的抑制效果最显著[109];H. chrysotricha精油(含32.7%龙脑)与链霉素组合时显示出协同潜力[4];L. angustifolia精油(含13.0–19.7%龙脑)与恩诺沙星组合时,82.35%的测试案例表现出强协同作用(FICI=0.155–0.375)[25]

三、协同作用的影响因素
  1. 成分比例:协同效应依赖于龙脑与其他成分的比例。例如,γ-萜品烯或α-萜品烯在与龙脑的协同组合中需占较高比例[106];L. angustifolia精油与恩诺沙星的协同作用中,两者浓度需调整至特定范围(如1/4 MIC的恩诺沙星与1/4 MIC的精油组合)[25]
  2. 细菌种类:协同作用具有菌种特异性。例如,L. angustifolia精油中的龙脑协同作用对金黄色葡萄球菌(S. aureus)菌株更显著,对甲氧西林耐药金黄色葡萄球菌(MRSA)的协同作用FICI低至0.076[23];T. vulgaris L.与M. communis L.精油(含27.15%龙脑)的组合对鼠伤寒沙门氏菌(S. typhimurium)表现出协同效应(FICI=0.498)[108];D. graveolens精油与氯霉素的协同作用对P. mirabilis ATCC 12453效果最佳[109]
  3. 精油整体组成:精油中多种成分的协同作用可能增强龙脑的效果。例如,S. kitaibelii精油中龙脑、柠檬烯、斯巴醇、石竹烯氧化物的相互比例是其抗菌活性的关键[100];A. setacea精油中龙脑与桉叶素(14.94%)、樟脑(10.13%)等成分的协同作用可能是其抗菌活性的基础[107];D. graveolens精油中龙脑与乙酸龙脑酯(21.7%)等成分的组合也参与协同抗菌[109]
四、龙脑协同抗菌的应用潜力

龙脑的协同抗菌特性使其在抗菌材料开发中具有应用价值。例如,基于龙脑的聚合物涂层可通过水解释放龙脑,与樟脑协同发挥防污抗菌作用[111];含龙脑的精油与抗生素组合可降低耐药菌的MIC——如薰衣草精油(含0.41%龙脑)与恩诺沙星组合对多重耐药菌的MIC显著降低[25];H. chrysotricha精油(含32.7%龙脑)与链霉素的协同作用可增强对革兰氏阳性菌的抑制[4]。这些研究表明,龙脑通过与其他成分的协同作用可有效提升抗菌效率,为耐药菌控制和天然抗菌剂开发提供了新方向。

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龙脑抗菌活性的作用机制及相关分子基础

龙脑:抗菌应用及作用机制研究进展

龙脑(borneol)是百里香属(Thymus)、鼠尾草属(Salvia)、迷迭香属(Rosmarinus)等植物精油中的核心活性成分,其含量因植物种类与产地存在显著差异。

不同植物精油中龙脑的含量分布

植物种类 龙脑含量 参考文献
Thymus satureioides(不同产地) 31.7%~41.3% [76]
T. vulgaris(普通百里香) 76.42% [97]
Artemisia aragonensis 13.20% [41]
Rhynchostylis gigantea 变种EOBD 11.07% [104]
Rosmarinus beesianus 15.0% [112]

这些精油的抗菌活性被认为与龙脑等萜类化合物密切相关[76][97]

抗菌与抗真菌活性

龙脑对革兰氏阳性菌、革兰氏阴性菌及真菌均具有抑制作用:在纯化合物测试中,其对金黄色葡萄球菌(S. aureus)、铜绿假单胞菌(P. aeruginosa)的抑制效果与香芹烯、樟脑相当[99];对肺炎链球菌(S. pneumoniae)敏感性较强,但对化脓性链球菌(S. pyogenes)相对耐药[113];同时可抑制白色念珠菌(C. albicans)、热带念珠菌(C. tropicalis)及红色毛癣菌(T. rubrum)、犬小孢子菌(M. canis)等皮肤癣菌[114][113][104]。值得注意的是,龙脑在亚抑菌浓度(MIC/2)下即可抑制细菌对惰性基质的黏附,并下调可溶性毒力因子表达[99]

龙脑的抗菌活性受浓度及协同作用调控:0.005%浓度下对白色念珠菌生物膜形成的抑制率超80%[114],但精油中龙脑浓度较低时可能减弱整体抗菌活性[91];与γ-松油烯或α-松油烯联用时,对白色念珠菌和热带念珠菌表现出协同抑制作用[106]。此外,龙脑衍生物也具有抗菌活性,如通过ZnBr₂催化和微波辅助Ferrier反应制备的2,3-不饱和葡萄糖苷衍生物(6b),处理金黄色葡萄球菌悬浮液10小时后浊度降低58%,显示缓慢溶菌效果[115]

作用机制

龙脑的抗菌机制以直接干扰细菌结构与功能为主:作为脂溶性化合物,其可穿透细胞膜脂多糖层,改变膜结构与通透性,导致细胞内离子梯度紊乱及关键分子泄漏,最终引起细胞死亡[104][116][112](如与柠檬醛联用时可增加李斯特菌和铜绿假单胞菌细胞膜孔隙率[117]);同时可通过分子对接与细菌关键酶(如异亮氨酰-tRNA合成酶)结合,干扰蛋白质合成等代谢过程[97]

针对细菌酪氨酸-tRNA合成酶(TyrRS)的分子对接显示,龙脑(CID 64685)可与TyrRS的甘氨酸(GLY 47)和丙氨酸(ALA 51)残基形成氢键,稳定复合物结构并影响酶催化活性,干扰氨基酸酰化过程[118];其衍生物6b的溶菌活性进一步支持细胞膜破坏机制[115]。抗真菌机制可能涉及线粒体呼吸抑制及膜通透性改变[104],同时(-)-龙脑可激活人中性粒细胞、调控炎症反应,通过宿主免疫间接发挥抗菌作用[113]

分子靶点与结构基础

龙脑的作用靶点涉及多种蛋白质:分子对接显示其与人类碳酸酐酶I、II、IV(结合概率36%)及瞬时受体电位阳离子通道M8亚型(TRPM8,结合概率31%)具有较高亲和力[119],但与抗菌机制的关联需进一步研究。在抗菌相关靶点中,龙脑与细菌TyrRS的氢键作用具有结构特异性,其羟基位置等结构特征与其靶点结合能力密切相关,且结合模式与樟脑、α-蒎烯等其他萜类化合物不同[118]

综上,龙脑通过直接破坏细胞膜、抑制酶活性及调节宿主免疫等多途径发挥抗菌作用,其衍生物活性及与细菌TyrRS的分子相互作用为新型天然抗菌剂开发提供了理论基础。

龙脑在不同应用场景中的抗菌性能表现

龙脑在不同应用场景中的抗菌性能表现

龙脑作为多种植物精油的核心成分,其抗菌活性受含量、协同成分、作用对象及应用场景的综合调控,在细菌/真菌抑制、生物膜防控、尘螨驱杀及食品防腐等领域均展现出潜在价值。以下通过整合不同植物精油中龙脑的含量及其对应的抗菌指标,系统呈现其活性特征:

不同植物精油中龙脑含量与抗菌活性对比

植物精油来源 龙脑含量 抗菌/抗真菌对象 主要活性指标(MIC/MBC/MFC等) 参考文献
P. barbatus 20.7% 多数微生物 MIC:0.137–0.55 mg/mL;MBC/MFC均为MIC的1倍 [21]
T. algeriensis 23.48% 革兰氏阳性菌(S. aureus、L. monocytogenes EGD-e)、革兰氏阴性菌(S. enteritidis、E. coli) 革兰氏阳性菌MIC < 0.5 µL/mL、MBC 0.5 µL/mL;革兰氏阴性菌MIC 1–2 µL/mL、MBC更高 [33]
迷迭香(R. officinalis) 10.39% 白色念珠菌 强抗真菌活性 [19]
Thymus satureioides 21.2% 微生物 MIC低至0.15 mg/mL;抑菌圈直径30.3 ± 0.02 mm [30]
R. beesianus 15.0% S. aureus、Enterococcus faecalis、B. subtilis等 MIC:3.13–6.25 mg/mL;MBC:6.25–12.50 mg/mL [112]
A. judaica 5.72%(endo-borneol) S. aureus、E. coli、C. albicans MIC:0.5、1.0、1.0 μL/disc [36]
T. maroccanus(花期后叶片) 16.3% 念珠菌、细菌 念珠菌MIC:0.12–0.25 mg/mL;细菌MIC:1.18–2.37 mg/mL(中等活性) [31]
X. hypolampra茎皮 7.8% S. aureus、S. pyogenes、E. coli MIC均>500 µg/mL(活性较弱) [71]
Achillea odorata subsp. pectinata 11.33% B. subtilis 抑菌圈直径31 ± 1 mm [7]
O. vulgare subsp. glandulosum(早期营养期) 2.38% E. coli、S. typhimurium、P. aeruginosa、B. subtilis MIC:E. coli/S. typhimurium 250 μg/mL;P. aeruginosa/B. subtilis 125 μg/mL [42]
LA 2020 19.35% 真菌菌丝体 15 µL用量可完全抑制体外生长 [26]

龙脑的抗菌活性还与植物提取阶段、部位及协同成分密切相关。例如,O. vulgare subsp. glandulosum精油的龙脑含量随物候期变化(早期营养期2.38%,花期未检出),但整体仍保持较高抗菌活性[42];部分植物根精油因龙脑含量较高,对S. aureus、B. cereus等的抑菌效果优于其他部位[120]。龙脑与百里酚、香芹酚等成分协同可增强活性,如T. maroccanus精油中龙脑与百里酚(27.8%)共存时,念珠菌抑制活性显著提升[31];迷迭香精油(龙脑23.7%)与ZnO纳米颗粒复合后,抑菌圈较单独使用时显著增大[121]

在特定场景中,龙脑相关制剂表现出针对性效果:食品防腐领域,E. globulus、S. hortensis和M. communis精油对E. coli O157:H7和S. aureus的MIC为0.05–0.22%(v/v),其中S. hortensis精油对肉类中E. coli的抑制效果最佳,储存7天后可降低70.74%[122];长效抗菌方面,IBOMA基聚合物涂层可水解释放龙脑,通过自更新及与樟脑的协同作用抑制细菌附着[111];单独使用时,1.0–2.0%浓度的龙脑可抑制S. aureus等5种细菌,MFC为1.5–2.0%[123]

除抗菌外,龙脑还具有显著抗尘螨活性:0.35 mg/mL龙脑精油(BEO)的尘螨驱避率达90.05±2.13%,0.70 mg/mL浓度处理48 h后死亡率>95%,机制可能为神经肌肉毒性导致尘螨脱水[124]

综上,龙脑的多场景活性为天然抗菌剂开发提供了方向,尤其在食品防腐、化妆品及医药领域具有应用潜力[164, 195, 225]。

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