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沉香精油的化學(xué)成分及其在神經(jīng)保護(hù)作用方面的應(yīng)用研究進(jìn)展

2024-12-31 00:00:00黃曉兵劉今陸含金楊勝濤李積華
熱帶作物學(xué)報(bào) 2024年7期
關(guān)鍵詞:結(jié)香倍半萜酮類

摘""要:沉香[Aquilaria"sinensis"(Lour.)"Gilg]是來源于瑞香科沉香屬或擬沉香屬含有樹脂的木材。其中,沉香精油(agarwood"essential"oil,"AEO)是沉香主要的功能活性組分,在神經(jīng)保護(hù)作用方面具有良好效果,常被用來舒緩身心,緩解焦慮、抑郁和治療失眠。大量研究表明,AEO的化學(xué)組成主要包括色酮類、倍半萜類、芳香族類、脂肪酸類以及其他化合物,其中2-(2-苯乙基)色酮和倍半萜類化合物是其特征組分。然而,AEO尚無明確的規(guī)范分級(jí)及質(zhì)量檢測(cè)標(biāo)準(zhǔn),品質(zhì)參差不齊,極大影響沉香產(chǎn)業(yè)的發(fā)展。AEO功效與其化學(xué)成分組成有著密切關(guān)聯(lián)。從不同的原料(品種、產(chǎn)地、造香方式及時(shí)間)和不同的提取方法(水蒸氣蒸餾、超臨界流體二氧化碳萃取、有機(jī)溶劑萃取法)得到的AEO的化學(xué)成分及含量存在較大的差異。因此,建立健全AEO規(guī)范分級(jí)和質(zhì)量檢測(cè)標(biāo)準(zhǔn),揭示AEO的化學(xué)成分與原料和提取方法之間的內(nèi)在聯(lián)系將是未來的研究方向。此外,由于人們對(duì)沉香的需求量不斷增加,沉香屬野生種群數(shù)量迅速下降,造成野生資源枯竭。但隨著人工種植和人工誘導(dǎo)方法的推廣,沉香產(chǎn)量有了很大的提高,為AEO的進(jìn)一步研究提供了研究基礎(chǔ)。本文綜述了不同來源AEO的化學(xué)成分及其在神經(jīng)保護(hù)作用方面的應(yīng)用前景,并分析了目前AEO研究存在的問題。

關(guān)鍵詞:沉香;精油;生物活性;神經(jīng)保護(hù);研究進(jìn)展中圖分類號(hào):Q949.761.1;R284.1""""""文獻(xiàn)標(biāo)志碼:A

Research"Progress"on"Chemical"Components"of"Agarwood"Essential"Oil"and"Application"in"Neuroprotective"Effects

HUANG"Xiaobing1,"LIU"Jin2,"LU"Hanjin1,2,"YANG"Shengtao1*,"LI"Jihua1,2*

1."Agricultural"Products"Processing"Research"Institute,"Chinese"Academy"of"Tropical"Agricultural"Sciences"/"Key"Laboratory"of"Tropical"Crop"Products"Processing,"Ministry"of"Agriculture"and"Rural"Affairs,"Zhanjiang,"Guangdong"524001,"China;"2."College"of"Food"Science,"Fujian"Agriculture"and"Forestry"University,"Fuzhou,"Fujian"350002,"China

Abstract:"Aquilaria"sinensis"(Lour.)"Gilg"is"a"resin"containing"wood"in"the"genus"Aquilaria"or"Gyrinops."Among"them,"agarwood"essential"oil"(AEO)"is"the"main"functional"active"component"of"agarwood,"which"has"good"neuroprotective"effect"and"is"often"used"to"soothe"the"body"and"mind,"relieve"anxiety"and"depression,"and"treat"insomnia."A"large"number"of"studies"have"shown"that"the"chemical"composition"of"AEO"mainly"includesnbsp;chromones,"sesquiterpenoids,"aromatics,"fatty"acids"and"other"compounds,"among"which"2-(2-phenethyl)"chromone"and"sesquiterpenoids"are"the"characteristic"components."However,"there"is"no"clear"standard"for"AEO"classification"and"quality"testing,"and"the"quality"of"AEO"is"uneven,"which"greatly"affects"the"development"of"agarwood"industry."The"efficacy"of"AEO"is"closely"related"to"its"chemical"composition."The"chemical"composition"and"content"of"AEO"obtained"from"different"raw"materials"(species,"origin,"induction"methods"and"time)"and"different"extraction"methods"(hydro-distillation,"supercritical"fluid"carbon"dioxide"extraction,"solvent"extraction)"are"quite"different."Therefore,"it"will"be"the"direction"of"future"research"to"establish"a"sound"grading"and"quality"testing"standard"of"AEO,"and"reveal"the"internal"relationships"of"the"chemical"composition"of"AEO"with"the"raw"materials"and"extraction"methods."In"addition,"due"to"the"increasing"demand"for"agarwood,"the"wild"population"of"agarwood"species"has"declined"rapidly,"resulting"in"the"depletion"of"wild"resources."However,"with"the"popularization"of"artificial"cultivation"and"induction"methods,"the"yield"of"agarwood"has"been"greatly"improved,"which"provides"a"research"basis"for"further"research"on"AEO."This"article"reviews"the"chemical"components"of"AEO"from"different"sources"and"their"application"prospects"in"neuroprotective"effects,"and"analyzes"the"problems"existing"in"the"current"research"of"AEO.

Keywords:"Aquilaria"sinensis;"essential"oil;"biological"activity;"neuroprotective;"research"advances

DOI:"10.3969/j.issn.1000-2561.2024.07.016

沉香[Aquilaria"sinensis"(Lour.)"Gilg]是一種含有樹脂的木材,形成于瑞香科沉香屬(擬沉香屬)的沉香樹。沉香樹是一種名貴熱帶作物,主要分布于我國(guó)海南、廣東、廣西、云南和福建等地。近年來,海南作為我國(guó)沉香的主要產(chǎn)區(qū),高度重視沉香產(chǎn)業(yè)的發(fā)展,制定了《海南省沉香產(chǎn)業(yè)發(fā)展規(guī)劃(2018—2025)》,大力扶持沉香產(chǎn)業(yè)發(fā)展,要將沉香產(chǎn)業(yè)培育成海南的“第四棵樹”,預(yù)計(jì)到2025年,海南沉香產(chǎn)業(yè)將實(shí)現(xiàn)綜合收入200億元。沉香樹的獨(dú)特之處在于,健康的樹木不生產(chǎn)沉香,但當(dāng)樹體受到外界破壞時(shí),會(huì)激活自身的防御機(jī)制,從而產(chǎn)生深棕色的樹脂,即沉香。作為一種著名的芳香中藥,沉香已被列入《中國(guó)藥典》,也是日本、印度等國(guó)的傳統(tǒng)名貴藥材。因其同時(shí)具有龍涎香和檀香的香味,享有“百香之王”的美譽(yù),在佛教、印度教、伊斯蘭教以及其他宗教儀式中被用作熏香。

早在古印度和中國(guó)古代就有通過芳香療法舒緩身心、預(yù)防疾病的做法[1]?,F(xiàn)代藥理學(xué)認(rèn)為,芳香植物精油可通過芳香物質(zhì)調(diào)節(jié)人體自主神經(jīng)系統(tǒng)、中樞神經(jīng)系統(tǒng)和內(nèi)分泌系統(tǒng),影響人的情緒、生理狀態(tài)和行為[2-4]。因此,芳香(熏香)療法常被用作治療慢性疼痛、抑郁、焦慮、失眠等神經(jīng)系統(tǒng)疾病的輔助治療[5-9]。此外,沉香精油(AEO)還具有抗氧化、抗菌、抗炎、凈化空氣、放松和鎮(zhèn)靜的功效[10-11]。AEO功效與其化學(xué)成分有著密切關(guān)聯(lián)。而從不同的原料(品種、產(chǎn)地、造香方式及時(shí)間)和不同的提取方法得到的AEO的化學(xué)成分存在較大的差異。AEO常用的提取方法有水蒸氣蒸餾(hydro-distillation,"HD)、超臨界流體二氧化碳萃取(supercritical"fluid"carbon"dioxide"extraction,"SFE)、有機(jī)溶劑萃取法(solvent"extraction,"SE)、亞臨界流體萃取、纖維素酶輔助萃取、微波萃取法等[12-13]。其中,以HD和SFE方法最為常用。

此外,隨著人們對(duì)沉香的需求量不斷增加,沉香屬野生種群數(shù)量迅速下降,造成野生資源枯竭。2004年起,沉香屬物種被列入《瀕危野生動(dòng)植物種國(guó)際貿(mào)易公約》附錄Ⅱ名單。然而,隨著廣泛的人工種植和人工誘導(dǎo)方法的推廣,沉香產(chǎn)量有了很大的提高,為AEO的進(jìn)一步研究提供了研究基礎(chǔ)。本文旨在系統(tǒng)綜述AEO的化學(xué)成分及影響因素,分析AEO目前存在的問題及其在神經(jīng)保護(hù)作用方面的應(yīng)用前景。

1""沉香精油的化學(xué)成分

研究表明,AEO的主要化學(xué)成分包括(2-苯乙基)色酮類、倍半萜類、芳香族類、脂肪酸類等化學(xué)成分[12,"14],具有治療喘息、胃痛、嘔吐、腰膝虛冷、止咳和緩解風(fēng)濕等作用[10]。其中倍半萜類和色酮類是AEO的特征組分,對(duì)AEO的氣味和功能活性具有顯著影響[15-16]。

1.1""色酮類

2-(2-苯乙基)色酮及其衍生物是在顯色酮的C-2位置取代苯乙基片段合成的一類化合物[17],已發(fā)現(xiàn)有240個(gè)不同的亞基[18]。作為沉香的特征組分之一,2-(2-苯乙基)色酮具有抑菌、抗炎、抗腫瘤、神經(jīng)保護(hù)以及乙酰膽堿酯酶、酪氨酸酶和葡萄糖苷酶抑制作用[19-22]。楊洋[23]從沉香中分離的色酮類化合物具有乙酰膽堿酯酶抑制活性。此外,研究發(fā)現(xiàn)2-(2-苯乙基)色酮衍生物可通過抑制炎癥因子的過量表達(dá)[24-25],調(diào)控STAT1/3和ERK1/2信號(hào)通路[26],抑制脂多糖誘導(dǎo)RAW264.7巨噬細(xì)胞中的炎癥介質(zhì)的產(chǎn)生,以達(dá)到抗炎效果。值得注意的是,HD法提取的AEO中不含2-(2-苯乙基)色酮,然而超臨界流體二氧化碳萃取(SFE)和微波輔助萃取得到的AEO通常含有2-(2-苯乙基)色酮類化合物。

1.2""倍半萜類

作為沉香的另一種特征組分,倍半萜是一種由3個(gè)異戊二烯組成的天然萜類化合物,在抑菌、抗氧化[27]、抗炎[28]、抗腫瘤[29]等方面有良好效果。從AEO分離得到的倍半萜類對(duì)金黃色葡萄球菌和青枯雷爾氏菌活性有顯著抑制作用,抑制圈直徑分別為(12.35±0.11)"mm和(16.90±0.09)"mm[30]。此外,沉香的倍半萜成分在中樞神經(jīng)系統(tǒng)、呼吸系統(tǒng)、消化系統(tǒng)等中具有良好的藥理功效和生物活性[31]。楊洋[23]還發(fā)現(xiàn)從沉香中分離的倍半萜類同樣具有乙酰膽堿酯酶抑制活性。

1.3""芳香族類

芳香族化合物也是AEO的重要組成部分,通常被認(rèn)為是AEO中香氣的主要來源。據(jù)報(bào)道,在加熱的沉香或AEO中可以檢測(cè)到更多的芳香族物質(zhì)。TAKAMATSU等[32]發(fā)現(xiàn)沉香中的2-(2-苯乙基)色酮加熱后會(huì)裂解產(chǎn)生小分子量芳香族化合物。

1.4""脂肪酸類

脂肪酸在沉香和AEO的化學(xué)成分及活性研究中提及較少。有研究表明在健康的白木香中正十六酸和油酸的含量高達(dá)59%,而在經(jīng)損傷形成的沉香中脂肪酸成分減少,倍半萜類和2-(2-苯乙

基)色酮類化合物明顯增加。由此可推斷,AEO中的脂肪酸含量越低,其品質(zhì)越高[33]。

2""沉香精油化學(xué)成分的影響因素

AEO的主要成分包括倍半萜類、色酮類、芳香族類和脂肪酸類。其中,倍半萜類化合物和(2-苯乙基)色酮類化合物分別作為AEO的主要組成成分和特征功能成分,與AEO的品質(zhì)和營(yíng)養(yǎng)健康功效存在密切關(guān)系。然而,不同的品種、產(chǎn)地、樹齡、結(jié)香方式及時(shí)間和提取方法對(duì)AEO的化學(xué)組成有很大的影響(表1)。如HD提取的AEO中,最主要的成分為倍半萜類化合物,通常不含色酮類化合物,而利用SFE得到的AEO中倍半萜類和色酮含量較高,成分也相對(duì)更豐富。但由于尚無學(xué)者針對(duì)沉香品種、結(jié)香方式和提取方法對(duì)沉香組成及功能活性的影響進(jìn)行全面系統(tǒng)的分析研究,難以判定影響AEO品質(zhì)的核心決定性因素。因此,本文綜述了目前不同品種、結(jié)香方式和提取方式對(duì)AEO的化學(xué)組成的影響,可為進(jìn)一步的系統(tǒng)性研究提供研究依據(jù)。

2.1""品種

目前,沉香屬植物有22種,擬沉香屬植物有7種,市售沉香的主要品種有馬來沉香(A."malaccensis)、白木香沉香(A."sinensis)、厚葉沉香(A."crassna)等。研究表明從不同品種、產(chǎn)地的沉香提取得到的AEO成分有明顯差異[37-39]。由表1可知,中國(guó)產(chǎn)的白木香沉香的芳香族化合物普遍較高,精油留香較為持久、氣味幽香。同時(shí),可以發(fā)現(xiàn)3種不同品種、產(chǎn)地的沉香中主要成分為倍半萜類化合物,其相對(duì)含量較高。此外,蟲蛀法得到的AEO中的脂肪酸化合物含量較高,并能用乙醇萃取得到色酮類化合物。同時(shí),在采用HD提取的AEO中,只有馬來沉香[37]和白木香沉香變種“Chi-Nan”的AEO中含有少量的2-(2-苯乙基)色酮[42]。由此可見,不同品種沉香提取得到的AEO的化學(xué)成分存在明顯差異性。然而,目前對(duì)不同物種精油的化學(xué)成分尚未進(jìn)行全面系統(tǒng)的比較,難以區(qū)分其優(yōu)劣。

2.2""結(jié)香方式

野生沉香是沉香樹受到外界力量傷害產(chǎn)生的,比如風(fēng)、雨、閃電、昆蟲等。由于形成周期較長(zhǎng),野生沉香資源不斷減少,再加上市場(chǎng)對(duì)沉香的需求不斷增長(zhǎng),造成了天然沉香價(jià)格居高不下[43]。為此,國(guó)家鼓勵(lì)發(fā)展沉香種植和推廣人工誘導(dǎo)結(jié)香技術(shù),生產(chǎn)人工沉香。人工結(jié)香技術(shù)主要包括物理創(chuàng)傷法、化學(xué)誘導(dǎo)法、微生物法以及通體結(jié)香技術(shù)。人工結(jié)香技術(shù)中的物理方法是在沉香樹受到外部物理創(chuàng)傷后結(jié)香,如砍傷、打洞、打釘、樹干斷裂和火烙。化學(xué)方法是用甲酸、乙烯利、氯化鈉、氯化鐵、過氧化氫等各種溶液誘導(dǎo)沉香樹體產(chǎn)生沉香。生物方法則是通過接種微生物誘導(dǎo)結(jié)香。通過打洞法獲得的沉香主要由倍半萜類為主,并且含有白木香醛、對(duì)甲氧基芐基丙酮等沉香特征性成分。而砍傷法結(jié)香的AEO中則以脂肪酸類為主[44]。向盼等[45]對(duì)不同打洞結(jié)香法所產(chǎn)沉香揮發(fā)性成分進(jìn)行分析,發(fā)現(xiàn)火烙打洞法所產(chǎn)沉香比冷鐵打洞法和常規(guī)打洞法所產(chǎn)沉香質(zhì)量好。陳品品等[35]比較了不同方法獲得的AEO的化學(xué)成分,發(fā)現(xiàn)真菌接種法形成的AEO中2-(2-苯乙基)色素的含量是燒鑿鉆法形成的AEO的2倍。此外,LIU等[34]發(fā)現(xiàn)沉香通體結(jié)香技術(shù)(Agar-WIT)誘導(dǎo)6個(gè)月的AEO提取率遠(yuǎn)高于其他3種方法(植菌法、火鉆法和砍傷法)誘導(dǎo)12個(gè)月以上的AEO提取率,并且由Agar-WIT誘導(dǎo)的AEO中含有更多的芳香成分。綜上所述,不同的沉香誘導(dǎo)方法對(duì)AEO的提取率和化學(xué)成分有顯著影響,而Agar-WIT是目前最具有競(jìng)爭(zhēng)力的誘導(dǎo)技術(shù),即可以縮短誘導(dǎo)生產(chǎn)沉香所需的時(shí)間,又可以得到較高品質(zhì)的沉香和AEO。此外,Agar-WIT是當(dāng)前中國(guó)以及其他生產(chǎn)沉香的國(guó)家應(yīng)用最廣泛的人工誘導(dǎo)技術(shù),已應(yīng)用于中國(guó)及東南亞國(guó)家超過45萬株沉香樹[46]。

2.3""提取方法

與其他植物精油一樣,AEO同樣擁有多種提取方法。目前,AEO的提取采用HD、SFE、SE以及其他的輔助方法。其中,HD使用水作為溶劑,安全無毒,設(shè)備簡(jiǎn)單,操作簡(jiǎn)易[47],是現(xiàn)如今工業(yè)生產(chǎn)中采用最多的方法,具有應(yīng)用廣、適用性強(qiáng)、普遍性高的特點(diǎn)。水蒸氣蒸餾法[48]雖然優(yōu)點(diǎn)很多,但同時(shí)也存在不可忽視的缺點(diǎn),例如,與水同為極性的精油組分難以回收;提取溫度過高和時(shí)間過長(zhǎng)。過高的提取溫度會(huì)破壞精油組分中熱敏性物質(zhì);而過長(zhǎng)的蒸煮時(shí)間可能導(dǎo)致精油中關(guān)鍵組分發(fā)生變化,以影響精油的品質(zhì)。有機(jī)溶劑萃取法[49]適用于揮發(fā)性、熱敏性及不穩(wěn)定的芳香化合物,可彌補(bǔ)HD的不足之處。同時(shí),根據(jù)相似相溶原則,SE萃取一些極性較小的揮發(fā)油成分時(shí),產(chǎn)率相對(duì)較低,并且有機(jī)溶劑具有一定的毒性,有機(jī)溶劑的殘留也會(huì)影響精油的質(zhì)量。此外,通過有機(jī)溶劑萃取的精油外觀、香氣等品質(zhì)相對(duì)較差。SFE是新興提取技術(shù)的代表,近年來發(fā)展迅速。該技術(shù)的特點(diǎn)是在超臨界狀態(tài)下,通過改變壓力和溫度以調(diào)節(jié)超臨界流體的溶解能力[50-51]。根據(jù)相似相溶原理將組織中的不同化合物依次擴(kuò)散到溶劑中,最終以減壓、升溫等手段將超臨界流體轉(zhuǎn)變?yōu)闅怏w釋放,從而得到萃取物。該過程可以在常溫下進(jìn)行,同時(shí)最終萃取物無溶劑殘留,即解決了HD高溫影響AEO中熱敏成分損失問題,也避免了有機(jī)試劑殘留。

從表1可以看出,不同提取方法得到的AEO化合物組成差異很大。采用HD提取AEO的提取率較低,一般為0.1%~0.5%,但倍半萜的相對(duì)含量較高,芳香族化合物的相對(duì)含量較低,這可能是由于在HD中持續(xù)高溫導(dǎo)致AEO揮發(fā)損失所致。值得注意的是,不同溶劑提取的AEO組成不同,即使用HD法,利用95%乙醇輔助提取,能提取出更多的芳香族和色酮類化合物。在相同溶劑的不同提取方法中,微波輔助提取方法產(chǎn)生的AEO的得率和物質(zhì)種類較高,分別為1.32%和70種,其中反映精油品質(zhì)的倍半萜類物質(zhì)和芳香族物質(zhì)分別為19種和20種,明顯高于水浴回流法、索氏提取法和超聲輔助萃取法3種方法[41]。采用HD、纖維素酶酶解輔助HD、內(nèi)生真菌發(fā)酵液浸泡輔助HD、微波輔助HD、微波結(jié)合內(nèi)生真菌發(fā)酵液浸泡輔助HD等5種方法提取馬來沉香中的AEO,發(fā)現(xiàn)5種提取方法獲得的AEO中主要成分均為倍半萜類化合物,4種輔助提取方法均能提高精油總量,其中用纖維素酶的酶解輔助法提高最多,其次為微波結(jié)合內(nèi)生真菌發(fā)酵液浸泡[38]。

相比之下,采用SFE提取AEO的提取率較HD有較高提升,可達(dá)0.8%~5.0%。此外,由于超臨界流體的溶解度強(qiáng),色酮類化合物更容易被提取出。戴偉杰等[52]采用HD、SFE和連續(xù)相變法提取AEO,發(fā)現(xiàn)連續(xù)相變提取AEO得率最高,為1.42%。而李響等[53]對(duì)SFE萃取AEO的工藝進(jìn)行優(yōu)化后,可以使得AEO的提取率達(dá)到1.89%。陳品品等[35]利用SFE提取不同結(jié)香方式下的AEO,共鑒定出以色酮類、倍半萜類和芳香族類為主要成分的59種化合物。其中,色酮類化合物有3個(gè),相對(duì)總含量達(dá)54.59%(植菌法結(jié)香)和29.45%(火鉆法結(jié)香)。田程飄等[36]對(duì)HD和SFE提取AEO的成分進(jìn)行對(duì)比研究,HD提取AEO中主要成分為倍半萜類(68.68%),SFE萃取的AEO主要成分為倍半萜類(23.78%)和色酮類(29.42%)。王健松等[54]比較了SFE和亞臨界萃取法得到AEO的差異,結(jié)果表明這2種提取方法的AEO主要成分基本相同,但相對(duì)含量存在差異??偟膩碇v,SFE萃取得到的AEO中倍半萜類和色酮含量較高,成分也相對(duì)更豐富??梢?,在實(shí)際生產(chǎn)應(yīng)用中,應(yīng)根據(jù)所需的AEO類型選擇合適的提取方法。

3""沉香精油在神經(jīng)保護(hù)作用方面的應(yīng)用

快節(jié)奏的現(xiàn)代生活和工作壓力,導(dǎo)致越來越多群體出現(xiàn)失眠、抑郁、焦慮等負(fù)面情緒,甚至誘發(fā)嚴(yán)重精神性疾病?!督】抵袊?guó)行動(dòng)(2019—2030)》數(shù)據(jù)調(diào)查顯示,我國(guó)失眠患者已達(dá)3.5億,抑郁癥終身患病率為12%~20%,嚴(yán)重者可誘發(fā)自殺。WHO報(bào)告指出,當(dāng)前抑郁癥已成為我國(guó)第二大疾病,預(yù)計(jì)到2030年將位列世界疾病負(fù)擔(dān)的首位[55]。我國(guó)藥典指出沉香具有行氣止痛、溫中止嘔、納氣平喘等功效[56]。在陶弘景所著《名醫(yī)別錄》中更是將沉香列為上品[57],有“藥中黃金”之稱。我國(guó)自古以來都有運(yùn)用聞香、熏香等方法的香薰(芳香)療法緩解神經(jīng)疲勞和焦慮情緒的習(xí)慣,而AEO是芳香療法中常用精油之一。研究表明,AEO具有抗炎、抗菌、抗氧化、抗腫瘤、抗焦慮、抗抑郁、促進(jìn)睡眠以及治療中樞神經(jīng)退行性障礙等多種功效(表2)。此外,傳統(tǒng)中醫(yī)認(rèn)為AEO具有舒緩身心的作用[58],可當(dāng)作安神油、助眠油、定香油等使用,可緩解壓力、焦慮,治療失眠、抑郁和其他精神障礙疾病[59]。同時(shí),現(xiàn)代藥理學(xué)研究表明,沉香中含有倍半萜類、色酮類、芳香族類等活性化合物,對(duì)中樞神經(jīng)系統(tǒng)具有積極效輔助治療果[60-61]。因此,AEO對(duì)神經(jīng)保護(hù)方面的作用是目前沉香研究的主要方向,具有良好的應(yīng)用前景。

3.1""抗焦慮

隨著生活節(jié)奏的不斷加快和工作壓力的提高,越來越多人長(zhǎng)期處于焦慮的精神狀態(tài),進(jìn)一步發(fā)展將形成神經(jīng)性障礙。焦慮的原因有很多,一般認(rèn)為焦慮障礙是由于調(diào)節(jié)焦慮過程中神經(jīng)遞質(zhì)出現(xiàn)紊亂,導(dǎo)致中樞神經(jīng)系統(tǒng)功能障礙,繼而引發(fā)焦慮障礙,如γ-氨基丁酸(GABA)和單胺類神經(jīng)遞質(zhì)減少等。因此,臨床上常將苯二氮卓類藥物(BDZ)、5-羥色胺再攝取抑制劑(SSRIs)和5-羥色胺-去甲腎上腺素再攝取抑制劑(SNRIs)作為臨床治療焦慮障礙的藥物[69-70]。苯二氮卓類藥物的抗焦慮作用是通過與GABA受體結(jié)合后,促進(jìn)GABA與其受體相互結(jié)合,從而降低神經(jīng)興奮性,緩解焦慮癥狀。而SSRIs和SNRIs則是通過抑制5-HT和去甲腎上腺素的再攝取來發(fā)揮抗焦慮作用。在治療長(zhǎng)期焦慮癥患者時(shí),藥物的副作用問題是經(jīng)常被提及的問題。因此,人們更喜歡采用長(zhǎng)期有效的非藥物治療方法,如心理咨詢、放松療法、針灸療法以及芳香(香薰)療法等[71]。其中,芳香療法作為一種外治方法,是利用植物精油中的芳香氣味和本身所富含的大量活性物質(zhì),經(jīng)由嗅聞和皮膚吸收,到達(dá)神經(jīng)系統(tǒng)和血液循環(huán),疏通筋絡(luò),舒緩身心[72]。利用香薰或嗅聞精油的方式來緩解焦慮癥狀,與藥物治療相比具有副作用少、無耐藥性等特點(diǎn)[73]。如圖1所示,其主要作用機(jī)制是精油以嗅聞形式經(jīng)鼻腔進(jìn)入神經(jīng)系統(tǒng)和血液循環(huán),并通過nNOS-CREB、NRG1/ErbB4、Sirt1/Nrf2/HO-1等信號(hào)通路調(diào)節(jié)γ-氨基丁酸、5-羥色胺、多巴胺等神經(jīng)遞質(zhì)的含量及表達(dá)水平,從而有效改善焦慮癥狀[74-75]。

慢性約束應(yīng)激(chronic"restraint"stress,"CRS)是一種常用的誘導(dǎo)心理和生理應(yīng)激反應(yīng)的方法,可引起神經(jīng)系統(tǒng)和內(nèi)分泌系統(tǒng)的一系列行為和生理變化,最終誘導(dǎo)焦慮的產(chǎn)生[76]。LEE等[77]利用反復(fù)約束應(yīng)激造成海馬氧化損傷動(dòng)物模型,發(fā)現(xiàn)沉香可有效抑制細(xì)胞中活性氧和促炎細(xì)胞因子及應(yīng)激激素的釋放,對(duì)神經(jīng)系統(tǒng)具有顯著保護(hù)作用。WANG等[9]采用十字高架迷宮(EPM)、光暗探索(LDE)和開闊場(chǎng)(OF)等一系列行為學(xué)試驗(yàn)方法,并通過檢測(cè)抑制應(yīng)激誘導(dǎo)小鼠焦慮癥狀來判斷其抗焦慮活性。結(jié)果顯示,AEO給藥組能夠劑量依賴性地改善小鼠的焦慮癥狀,并顯著增加EPM實(shí)驗(yàn)中小鼠張開雙臂的時(shí)間、距離和進(jìn)入時(shí)間;在LDE試驗(yàn)中增加了小鼠在光室中的停留時(shí)間;40"mg/kg"AEO的效果與2.5"mg/kg地西泮(陽(yáng)性藥物)相當(dāng)。以上結(jié)果證明AEO具有顯著改善焦慮癥狀的作用。弓寶等[78]采用香薰試驗(yàn)發(fā)現(xiàn)AEO能有效提高焦慮和抑郁模型動(dòng)物的海馬體中對(duì)谷氨酸系統(tǒng)代謝、谷氨酸受體和囊泡谷氨酸轉(zhuǎn)運(yùn)蛋白的表達(dá),表現(xiàn)出顯著地抗焦慮和抗抑郁作用,且其作用機(jī)制可能與調(diào)控神經(jīng)遞質(zhì)分泌、受體及轉(zhuǎn)運(yùn)體蛋白的表達(dá)有關(guān),這與WANG等[79]

得到的吸入AEO對(duì)于焦慮癥和抑郁癥有很大緩解作用的結(jié)果一致。值得關(guān)注的是,布格呋喃(buagafuran)是一種抗廣泛性焦慮障礙的Ⅰ類新藥物,它是通過從沉香中分離的沉香呋喃類化合物進(jìn)行結(jié)構(gòu)修飾而獲得的。在多種動(dòng)物試驗(yàn)中布格呋喃顯示出抗焦慮作用,并且毒副作用低,目前已經(jīng)完成了二期臨床試驗(yàn)[80]。以上說明從沉香中分離得到的AEO和一些單體化合物及其衍生物具有潛在的抗焦慮活性,是開發(fā)抗焦慮預(yù)防保健品和藥物的良好來源。

3.2""抗抑郁

抑郁癥是一種常見的心理障礙,會(huì)伴有焦慮、睡眠障礙等不同程度的心理和軀體癥狀,且有反復(fù)發(fā)作的傾向,其發(fā)病率正在逐年上升,已經(jīng)成為一個(gè)嚴(yán)峻的社會(huì)問題,全世界約有15%~18%的人受到抑郁癥的困擾。據(jù)WHO預(yù)測(cè),到2030年,抑郁癥將超過心腦血管疾病成為人類第一大疾病[81]。抑郁癥的發(fā)病機(jī)制與多種因素有關(guān),腦內(nèi)單胺能神經(jīng)(如5-HT、NA)功能低下可能是抑郁癥的病因之一。目前臨床使用的抗抑郁藥主要有單胺再攝取抑制劑、單胺氧化酶抑制劑等,但數(shù)據(jù)表明約有一半的抑郁癥患者在首次用藥治療后無明顯效果,在后續(xù)用藥治療中同樣收效甚微[82]。因此,尋找挖掘天然、高效、低毒的抗抑郁藥仍是需要攻克的難關(guān)。

WANG等[9]通過現(xiàn)代藥理學(xué)實(shí)驗(yàn)對(duì)應(yīng)激小鼠進(jìn)行懸尾(TS)和強(qiáng)迫游泳(FS)試驗(yàn),發(fā)現(xiàn)在TS和FS試驗(yàn)中,20"mg/kg和40"mg/kg劑量下的AEO與10"mg/kg的帕羅西汀具有相似的療效,能顯著縮短小鼠不動(dòng)時(shí)間,由此推測(cè)AEO具有良好的抗抑郁作用的潛力。汪鳳華等[64]在TS和FS實(shí)驗(yàn)中,通過觀察二十味沉香丸對(duì)絕望小鼠的行為變化,同樣發(fā)現(xiàn)二十味沉香微丸能縮短小鼠的不動(dòng)時(shí)間,緩解小鼠的抑郁癥狀。此外,黃國(guó)堯等[83]將40例抑郁癥患者隨機(jī)分為2組,對(duì)照組采用心理指導(dǎo)加抗抑郁藥物治療,治療組則采用沉香芳香療法。2組均在此基礎(chǔ)上每日點(diǎn)香2次,2周為1個(gè)療程,治療2個(gè)療程。結(jié)果顯示,沉香芳香療法能降低抑郁量表(CES-D)和漢密爾頓抑郁量表(HAMD)評(píng)分,治療組總有效率為85%,對(duì)照組總有效率為55%。以上說明芳香療法能有效改善抑郁癥患者的臨床癥狀,具有良好的臨床效果。

3.3""促進(jìn)睡眠

睡眠是一個(gè)活躍的過程,主要發(fā)生在中樞神經(jīng)系統(tǒng)及其相關(guān)的神經(jīng)遞質(zhì)和細(xì)胞因子。由于這一生理過程涉及多種因素,因此失眠的原因是極其復(fù)雜的。目前,失眠的發(fā)病機(jī)制主要有2種學(xué)說:(1)由于應(yīng)激等因素引起下丘腦-垂體-腎上腺皮質(zhì)系統(tǒng)(hypothalamic-pituitary-adrenal"cortex"system,"HPA)功能障礙和神經(jīng)內(nèi)分泌系統(tǒng)失調(diào);(2)與睡眠-覺醒效應(yīng)相關(guān)的中樞神經(jīng)遞質(zhì)失調(diào)。其中,多巴胺(DA)和去甲腎上腺素(NE)是促進(jìn)和維持覺醒的神經(jīng)遞質(zhì),而5-HT和GABA是具有鎮(zhèn)靜催眠功能的抑制性神經(jīng)遞質(zhì)[21]。鎮(zhèn)靜催眠藥物是一類對(duì)中樞神經(jīng)系統(tǒng)具有抑制作用的藥物,主要有苯二氮卓類、巴比妥類及其他類藥物。此外,長(zhǎng)期使用鎮(zhèn)靜安眠類藥物除了存在副作用,還會(huì)出現(xiàn)抗藥性和成癮等問題。而沉香和AEO作為一種傳統(tǒng)的鎮(zhèn)靜安眠劑,尚未發(fā)現(xiàn)有耐藥性[8],可輔助治療睡眠障礙。

王帥等[65]使用沉香的不同提取物(水提取物、乙醇提取物和精油)協(xié)同戊巴比妥鈉進(jìn)行催眠實(shí)驗(yàn)發(fā)現(xiàn),與空白組相比,沉香提取物和AEO能顯著增加小鼠的睡眠率和延長(zhǎng)睡眠時(shí)間,并有效縮短小鼠的睡眠潛伏期,說明沉香提取物和AEO具有較強(qiáng)的鎮(zhèn)靜催眠作用。梁宇等[67]采用正常小鼠和經(jīng)300"mg/kg"PCPA誘導(dǎo)的失眠小鼠為研究模型,發(fā)現(xiàn)吸入沉香能顯著促進(jìn)正常小鼠的睡眠,顯著改善失眠小鼠的生活質(zhì)量和運(yùn)動(dòng)能力。雷莉等[68]將120例失眠障礙患者進(jìn)行隨機(jī)分組治療,實(shí)驗(yàn)組每晚睡前接受沉香熏蒸,對(duì)照組接受不影響睡眠的丙醇熏蒸,發(fā)現(xiàn)沉香熏蒸治療顯著改善了失眠障礙患者的睡眠質(zhì)量,降低了失眠的嚴(yán)重程度,并能改善焦慮、抑郁等情緒障礙。上述研究表明AEO的芳香療法具有顯著的鎮(zhèn)靜催眠作用,且不良反應(yīng)少,無明顯耐藥性,是一種有效的失眠替代治療方法。

3.4""神經(jīng)退行性疾病

神經(jīng)退行性疾病主要是由于神經(jīng)元和(或)其髓鞘的喪失而出現(xiàn)的神經(jīng)性功能障礙。其發(fā)病機(jī)制與多種因素有關(guān),乙酰膽堿被膽堿酯酶快速水解,從而阻斷神經(jīng)信號(hào)傳遞可能是發(fā)病的原因之一。楊洋[23]發(fā)現(xiàn)從沉香中分離的倍半萜類和色酮類化合物能有效抑制乙酰膽堿酯酶活性。LI等[21]發(fā)現(xiàn)從沉香中分離出的69種化合物具有不同程度乙酰膽堿酯酶抑制活性??梢姡料阒泻写罅康奶烊灰阴D憠A酯酶抑制劑,具有治療神經(jīng)退行性疾病的潛力。以上研究表明沉香是一種很有前景的神經(jīng)保護(hù)候選藥物,其或?qū)⒊蔀槲磥淼难芯繜狳c(diǎn)。

4""討論與展望

自20世紀(jì)50年代以來,國(guó)內(nèi)外對(duì)沉香的化學(xué)成分進(jìn)行了大量研究,發(fā)現(xiàn)AEO主要由倍半萜類、色酮類、芳香族類、脂肪酸類等化合物組成。其中,倍半萜類和(2-苯乙基)色酮類作為AEO的特征組分,備受關(guān)注。截至目前,從沉香中已經(jīng)分離并命名了超過210種倍半萜類、240種色酮類化合物。然而,沉香的來源(包括品種、產(chǎn)地、樹齡、結(jié)香方式及時(shí)間)和精油提取方法均會(huì)影響AEO的化學(xué)組成,同時(shí)影響AEO品質(zhì)質(zhì)量。因此,沉香精油的化學(xué)成分組成具有潛在鑒定沉香真?zhèn)魏椭笇?dǎo)AEO提取工藝改進(jìn)的作用,如在健康的白木香中脂肪酸含量高達(dá)59%,而經(jīng)損傷形成的沉香中脂肪酸成分減少,倍半萜類和2-(2-苯乙基)色酮類化合物明顯增加[33];HD得到的AEO中主要為倍半萜類化合物,而SFE得到的AEO中含有更多的(2-苯乙基)色酮類化合物。除此之外,化學(xué)成分也可用于鑒別沉香的來源,如白木香變種“Chi"Nan”沉香和普通白木香沉香提取的AEO成分有明顯不同。目前,AEO尚無明確的規(guī)范分級(jí),市場(chǎng)“云龍混雜”,品質(zhì)參差不齊,極大地影響著沉香產(chǎn)業(yè)的發(fā)展。在此背景下,我國(guó)應(yīng)進(jìn)一步推進(jìn)沉香及AEO的規(guī)范分級(jí)和質(zhì)量檢測(cè)標(biāo)準(zhǔn)的制定,促進(jìn)沉香產(chǎn)業(yè)高質(zhì)量發(fā)展。

此外,沉香作為一種名貴的香料和重要的中藥,除了具有獨(dú)特的香味外,還具有鎮(zhèn)靜、安神的傳統(tǒng)功效,如今仍是芳香療法中舒緩身心的常用精油之一,常用于緩解焦慮、抑郁、治療失眠和中樞退行性疾病等精神障礙?,F(xiàn)代藥理學(xué)認(rèn)為,AEO可能通過抑制HPA軸過度反應(yīng)、抑制海馬nNOS蛋白水平、降低大腦皮質(zhì)和海馬CRF基因表達(dá)、降低血清ACTH和CORT水平以及調(diào)節(jié)5-HT、DA、NE等神經(jīng)遞質(zhì),發(fā)揮抗焦慮、抗抑郁、鎮(zhèn)靜促進(jìn)睡眠的作用。目前,AEO尚未在國(guó)內(nèi)外得到廣泛應(yīng)用,市場(chǎng)上除了香薰精油產(chǎn)品外,大部分AEO都是作為香水和香氛水的原料。AEO在神經(jīng)保護(hù)作用方面的獨(dú)特的藥理優(yōu)勢(shì)尚未被挖掘,這可能與早期AEO價(jià)格昂貴以及對(duì)其藥理療效和作用機(jī)制的研究不夠深入有關(guān)。值得關(guān)注的是,通過多年培育和發(fā)展,沉香產(chǎn)業(yè)不斷擴(kuò)大且日漸成熟,涉及種植業(yè)、加工業(yè)和服務(wù)業(yè),初步形成全產(chǎn)業(yè)鏈,呈現(xiàn)出良好發(fā)展態(tài)勢(shì)和巨大的發(fā)展?jié)摿?,使得市售AEO的價(jià)格大幅度下降且穩(wěn)定,使AEO的功能活性研究有了更好的物質(zhì)基礎(chǔ)。因此,針對(duì)AEO對(duì)神經(jīng)保護(hù)功效的科學(xué)內(nèi)涵和應(yīng)用,探明其功效活性與核心功能因子的研究將是當(dāng)前研究的重點(diǎn)方向,具有良好的應(yīng)用前景。同時(shí),本文對(duì)AEO化學(xué)成分的現(xiàn)有研究進(jìn)行了初步梳理,希望對(duì)未來AEO等級(jí)的分類提供一定的參照依據(jù)。不足之處在于,目前對(duì)各類沉香精油的研究主要是基于化學(xué)成分和藥理活性的比較研究,尚不足以證明不同來源的沉香木何種更佳,也不足以證明何種AEO提取方式得到的精油中功能活性更好。

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