曹婭 張金龍 王強(qiáng)
摘 要:對(duì)紫蘇各種活性物質(zhì)的種類及其抗氧化、抗炎抑菌、抗腫瘤、抗過敏、調(diào)節(jié)糖脂代謝等功能進(jìn)行綜述,對(duì)紫蘇的研究方向進(jìn)行展望,為紫蘇的開發(fā)利用提供科學(xué)依據(jù)。
關(guān)鍵詞:紫蘇;活性成分;生理功能
紫蘇是我國傳統(tǒng)的藥食同源調(diào)味香料[1],在我國分布廣泛,種植歷史悠久[2]。目前的研究將紫蘇分為5個(gè)變種,即紫蘇、白蘇、野生紫蘇、耳齒紫蘇和回回蘇,其中紫蘇作經(jīng)濟(jì)植物[3],在飲食、醫(yī)藥、化妝品等方面均有應(yīng)用,飲食中常用作調(diào)味品可去腥、增味、提鮮等,深受人們喜愛[4]。紫蘇葉、莖、籽均可入藥或食用,具有解表散寒、行氣和胃、抗炎解毒、鎮(zhèn)咳平喘、祛痰等功效,長(zhǎng)期食用還可預(yù)防和治療心血管疾病[5]。紫蘇不僅富含豐富的營養(yǎng)物質(zhì),同時(shí)含有多種生物活性成分,如揮發(fā)油類、黃酮類、酚酸類、萜類、花色苷類及多糖類化合物等[6-10]。紫蘇的功能作用主要包括抗氧化、抗炎抑菌、抗腫瘤、抗過敏、抗抑郁等[11-25]。
1 揮發(fā)油類
1.1 揮發(fā)油的種類
紫蘇中的揮發(fā)油類是形成紫蘇特異香氣的重要來源,其成分主要包括萜類、芳香族及脂肪族等多種化合物[26]。通過GC/MS技術(shù)對(duì)紫蘇中揮發(fā)油成分進(jìn)行分析鑒定,發(fā)現(xiàn)其主要成分是紫蘇醛、紫蘇烯、紫蘇酮等,而倍半萜類含量相對(duì)較少[27-28]。研究表明,紫蘇品種、采收部位、采收時(shí)間與生長(zhǎng)環(huán)境等不同,揮發(fā)油的成分含量會(huì)有很大差異。Lin等[30]比較了中國與日本紫蘇中揮發(fā)油的成分,結(jié)果顯示,兩者的主要成分均為紫蘇醛、檸檬烯,不同的是日本紫蘇中紫蘇醛含量較高,檸檬烯含量較低。與之不同,楊軍輝等[29]通過HSGC/MS測(cè)定不同采收期的紫蘇葉,均未檢測(cè)出紫蘇醛。紫蘇籽與紫蘇莖葉中揮發(fā)油差異也較大,籽中側(cè)柏酮含量占65%,莖葉中2 -己?;秽珵橹饕煞?。溫帶環(huán)境下對(duì)紫蘇進(jìn)行檢測(cè)發(fā)現(xiàn)其主要成分為紫蘇醛、檸檬烯,而寒帶環(huán)境中的紫蘇主要成分為紫蘇酮[28,30]。
1.2 功能作用
1.2.1 抗炎作用 紫蘇對(duì)耳炎、特應(yīng)性皮炎、肝炎、結(jié)腸炎等均具有有效的抑制作用。通過急性炎癥動(dòng)物模型發(fā)現(xiàn),2 μL /kg與1 μL /kg紫蘇葉揮發(fā)油均能顯著抑制小鼠二甲苯耳廓腫脹、大鼠蛋清足腫脹,還可減輕小鼠棉球肉芽腫重量,表現(xiàn)出良好的抗炎作用[31]。Lee等[32]發(fā)現(xiàn),紫蘇油可以減輕小鼠體內(nèi)的基質(zhì)金屬蛋白酶(MMP)-9、白細(xì)胞介素(IL)-31表達(dá),增強(qiáng)T-bet活性,抑制2,4-二硝基氟苯誘導(dǎo)的特異性皮炎,降低皮膚組織的嗜酸性粒細(xì)胞水平。紫蘇油通過促炎酶的表達(dá)、核factor-kappa B (NF-κB)和轉(zhuǎn)錄激活3 (STAT3)的抑制活性,可以改善葡聚糖硫酸鈉誘導(dǎo)的鼠結(jié)腸炎[33]。紫蘇的抗炎作用機(jī)制主要包括調(diào)控固有免疫細(xì)胞的活性和功能及免疫球蛋白、調(diào)控炎癥細(xì)胞因子和輔助性T細(xì)胞平衡、調(diào)控ROS和NO水平以及調(diào)控組胺和花生四烯酸代謝物等[34-36]。
1.2.2 抑菌作用 紫蘇揮發(fā)油是其抗菌作用的主要成分。Guo等[37]研究發(fā)現(xiàn),紫蘇揮發(fā)油對(duì)金黃色葡萄球菌與大腸桿菌具有較強(qiáng)的抑菌作用,最低抑菌濃度(MIC)分別是500、1 250 μg /mL;對(duì)毛霉菌、黃青霉菌的MIC為62.5 μg /mL,對(duì)金黃色葡萄球菌的MIC為0.2~0.4 mL/mL[38]。紫蘇揮發(fā)油不僅可以抑制細(xì)菌、真菌的生長(zhǎng),還可以抑制毒素的產(chǎn)生,紫蘇揮發(fā)油可有效減少金黃色葡萄球菌中α-毒素,腸毒素A和B、中毒性休克綜合征金黃色葡萄球菌毒素1(TSST-1)等,β-內(nèi)酰胺類抗生素聯(lián)合使用可用于治療金黃色葡萄球菌感染疾病[39]。
1.2.3 抗腫瘤作用 流行病學(xué)研究發(fā)現(xiàn),紫蘇揮發(fā)油與乳腺癌、人肺癌、肝癌、皮膚癌等腫瘤疾病發(fā)病率的降低密切相關(guān)。袁芃等[40]通過體外實(shí)驗(yàn)發(fā)現(xiàn),20 mg/mL紫蘇揮發(fā)油處理72 h,對(duì)人肺癌LTEP-a-2細(xì)胞的抑制效果最佳,抑制率為85%。Osakabe等[41]通過小鼠皮膚癌模型發(fā)現(xiàn),2.0 mg/mL小鼠的紫蘇揮發(fā)油可通過抑制炎癥反應(yīng)與清除活性氧自由基兩種途徑,對(duì)小鼠皮膚癌發(fā)揮抗癌作用。Wang等[42]以紫蘇中的異麥草酮研究了對(duì)Huh-7肝癌細(xì)胞的抗癌作用,發(fā)現(xiàn)10 nmol/L的異麥草酮使細(xì)胞活性降低了1.5倍,腫瘤的體積及重量降低了2.1倍,并推測(cè)其抗癌機(jī)制是通過阻斷PI3K / Akt信號(hào)通路。紫蘇揮發(fā)油中含有香茅醇和丁香油酚等成分,香茅醇通過抑制周期蛋白依賴性激酶2的活性與表達(dá),引起G1期阻滯,從而抑制人乳腺癌MCF-7細(xì)胞的增殖,丁香油酚則可通過提高乳腺癌細(xì)胞對(duì)化療的敏感性從而達(dá)到抗癌作用[43]。
1.2.4 抗氧化作用 紫蘇不同部位(葉、莖和籽)的揮發(fā)油均具有一定的抗氧化能力,其中以紫蘇葉揮發(fā)油清除DPPH·的能力較強(qiáng),紫蘇籽精油清除·OH的能力較強(qiáng)[19,44]。Tian等[45]研究了不同地區(qū)的紫蘇揮發(fā)油的抗氧化性,發(fā)現(xiàn)10 mg/mL濃度的平?jīng)鲎咸K揮發(fā)油對(duì)DPPH·的抑制率為94.8%,IC50為0.064 2 mg/mL,抗氧化性最強(qiáng)。Wang等[46]研究發(fā)現(xiàn),紫蘇揮發(fā)油不同成分表現(xiàn)出不同的的清除率,但均對(duì)·OH具有較強(qiáng)的清除作用,是對(duì)照組的1.1~1.9倍。
2 黃酮類化合物
2.1 黃酮類化合物的種類
黃酮類化合物是紫蘇中的重要組成成分,包括木犀草素、木犀草素-7-O-葡萄糖苷、紫蘇異酮、芹菜素、芹菜素-7-O-葡萄糖苷、5-羥基-6,7-二甲氧基黃酮、野黃芩苷等,具有抗炎、抑菌、抗氧化、抗腫瘤、抗過敏等作用,近年來被廣泛應(yīng)用于醫(yī)藥、食品等領(lǐng)域[16-19,47-51]。
2.2 功能作用
2.2.1 抗氧化作用 黃酮類化合物具有保護(hù)人體免受自由基損傷的抗氧化作用[52]。紫蘇葉中的黃酮對(duì)·OH和DPPH·均有較好的清除效果,IC50分別為0.130、0.032 mg/mL[53]。木犀草素是紫蘇黃酮中的重要成分,能顯著清除DPPH·,IC50為43.52 μg/mL,還能抑制亞油酸催化氧化大豆脂氧合酶-1的活性,IC50為5.0 μmol/L[54-55]。該化合物能顯著逆轉(zhuǎn)過氧化氫誘導(dǎo)的原代皮層神經(jīng)元細(xì)胞毒性,作用機(jī)制是降低ROS的產(chǎn)生,并阻止了ROS損傷引起的原代神經(jīng)元中線粒體、過氧化氫酶和谷胱甘肽活性的降低[56]。
2.2.2 抗炎作用 郎玉英等[57]發(fā)現(xiàn),400 mg/kg紫蘇總黃酮對(duì)二甲苯誘發(fā)的小鼠耳腫脹、棉球誘發(fā)大鼠肉芽腫的抑制率分別是對(duì)照組的1.62、1.46倍,其作用機(jī)制是通過抑制IL-6和腫瘤壞死因子-α(TNF-α)等炎癥介質(zhì)生成。目前已經(jīng)明確的黃酮抗炎成分有木犀草素、紫蘇異酮。Jin等[58]通過紫蘇異酮可使脂多糖(LPS)刺激的 RAW 264.7細(xì)胞中,NO水平呈劑量依賴性降低,20 μmol/L紫蘇異酮使NO降低了11倍。Ueda等[47]通過給小鼠灌胃發(fā)現(xiàn),0.5 mg的木犀草素處理3 h,小鼠耳腫脹度降低了1.12倍;通過對(duì)LPS誘導(dǎo)的小鼠腹腔注射0.2 mg/kg的木犀草素,小鼠的存活率增加了48%[59]。木犀草素作用機(jī)制是通過抑制血清TNF-α和細(xì)胞間黏附分子1(ICAM-1)表達(dá),還可抑制細(xì)胞中NF-κB和MAPK的活化,抑制PGE2、NO和IL-6等產(chǎn)生,減弱炎癥反應(yīng)[60-61]。
2.2.3 抑菌作用 紫蘇中黃酮類化合物對(duì)細(xì)菌、真菌均具有良好的抑菌作用,在食品中常用作保鮮劑。張蕾蕾[16]通過比較乙醇、白醋兩種方法提取紫蘇中黃酮類物質(zhì)對(duì)壽司攜帶菌的抑菌作用,結(jié)果發(fā)現(xiàn),兩者對(duì)大腸桿菌的MIC分別是65、50 μg/mL,對(duì)匍枝根霉的MIC分別為55、45 μg/mL,白醋提取的黃酮類物質(zhì)具有較高的抑菌活性,抑制率可到81.7%。孫也評(píng)[62]首次在紫蘇中分離出5-羥基-6,7-二甲氧基黃酮,并發(fā)現(xiàn)對(duì)金黃色葡萄球菌、變形鏈球菌、枯草芽孢桿菌均具有良好的抗菌活性,MIC為32~64 μg/mL。郭群群等[63]發(fā)現(xiàn),1 mg/mL的木犀草素對(duì)金黃色葡萄球菌、大腸桿菌的抑菌環(huán)直徑分別為24、16 mm,具有良好的抗菌作用。
2.2.4 抗過敏 黃麗等[48]通過透明質(zhì)酸酶抗過敏活性試驗(yàn),將紫蘇中的抗過敏成分為AA、BB和CC三個(gè)部位,對(duì)透明質(zhì)酸酶抑制率分別為85%、70.6%、91.2%,并發(fā)現(xiàn)AA中主要含花色素類物質(zhì),BB和CC主要為黃酮和黃酮醇類物質(zhì)。Ueda等[47]通過對(duì)小鼠致敏前3 h口服1 mg/小鼠的木犀草素,發(fā)現(xiàn)耳重量降低了1.12倍,木犀草素可抑制惡唑酮誘導(dǎo)的過敏性耳水腫。
2.2.5 降血糖血脂作用 周達(dá)等[64]通過四氧嘧啶誘導(dǎo)的糖尿病小鼠模型,發(fā)現(xiàn)300 mg/(kg·d)的紫蘇黃酮能顯著降低小鼠的血糖水平,降糖率達(dá)到26.0%。此外,研究發(fā)現(xiàn),50 mg/kg的紫蘇總黃酮使血糖的濃度降低了63.5%,同時(shí)顯著降低血清總膽固醇(TC)和甘油三酯(TG)含量,具有較好的降血糖、降血脂作用[65]。
3 酚酸類化合物
3.1 酚酸類化合物的種類
紫蘇中含有豐富的酚酸類化合物,目前從紫蘇中分離的酚酸類主要是迷迭香酸、咖啡酸、原兒茶醛等,還含有少量的阿魏酸等[66-68]。
3.2 功能作用
3.2.1 抗氧化作用 酚酸類成分具有抑制超氧離子的產(chǎn)生和低密度脂蛋白氧化、增加抗氧化酶mRNA和蛋白表達(dá)水平等作用[69]。Zhou等[70]發(fā)現(xiàn),10 μg /mL紫蘇中迷迭香酸對(duì)DPPH·的清除率為88.3%。紫蘇中的迷迭香酸可通過增加細(xì)胞活力和抑制脂質(zhì)過氧化來防止氧化應(yīng)激[71]。Lee等[72]以阿爾茨海默氏小鼠為模型,發(fā)現(xiàn)迷迭香酸對(duì)氧化應(yīng)激的保護(hù)作用與抑制NO和丙二醛(MDA)水平有關(guān),0.25 mg/(kg·d)的迷迭香酸使NO、MDA的表達(dá)分別降低了1.45、1.47倍。Osakabe等[73]發(fā)現(xiàn),迷迭香酸能夠保護(hù)LPS誘導(dǎo)的小鼠肝損傷,是通過抑制超氧化物歧化酶、亞硝酸鹽的活性,而非抑制TFN的產(chǎn)生。迷迭香酸可通過減少細(xì)胞內(nèi)ROS的生成、激活C-Jun氨基末端激酶和細(xì)胞外信號(hào)調(diào)節(jié)激酶,進(jìn)而抑制阿霉素誘導(dǎo)的H9c2心肌細(xì)胞凋亡[74]。
3.2.2 抗過敏作用 紫蘇酚酸類物質(zhì)因具有抗過敏作用被廣泛應(yīng)用于皮膚過敏、過敏性哮喘、過敏性鼻炎等疾病。Makino等[75]通過I型過敏小鼠模型,發(fā)現(xiàn)2.5%迷迭香酸、1.6%芹菜素-7-O-葡萄糖苷酸可顯著抑制小鼠耳部被動(dòng)皮膚過敏反應(yīng),抑制率分別為41%、32%。Sanbongi等[76]研究發(fā)現(xiàn),迷迭香酸可顯著抑制室內(nèi)塵螨過敏原致過敏性哮喘,1.5 mg/d 迷迭香酸可抑制小鼠肺內(nèi)IL-4、IL-5及嗜酸性粒細(xì)胞因子蛋白的表達(dá),分別降低了1.65、1.67、1.81倍,還可抑制過敏原IgG1的表達(dá),具有較強(qiáng)的抗過敏作用。此外,迷迭香酸可抑制季節(jié)性過敏性鼻結(jié)膜炎,作用機(jī)制可通過抑制多形核白細(xì)胞浸入鼻孔,減少嗜中性粒細(xì)胞和嗜酸性粒細(xì)胞數(shù)量,從而達(dá)到抗過敏作用[77]。
3.2.3 抗抑郁作用 抑郁癥的患病率在10%~15%,已經(jīng)成為主要的疾病[78]。目前主要的治療方式是口服化學(xué)藥物,近年來抗抑郁食品的治療方法逐步受到重視。Ito等[79]通過小鼠抑郁動(dòng)物模型,發(fā)現(xiàn)4.0 mg/kg的迷迭香酸使增殖細(xì)胞標(biāo)記物脫氧尿苷增加了1.5倍,推測(cè)迷迭香酸是通過海馬齒狀回新生細(xì)胞的增殖產(chǎn)生發(fā)揮抗抑郁作用。Takeda等[80]研究發(fā)現(xiàn),2.0 mg/kg迷迭香酸和4 mg/kg的咖啡酸在小鼠強(qiáng)迫游泳實(shí)驗(yàn)中,顯著縮短了小鼠的靜止時(shí)間分別為1.6、1.8倍,但沒有影響自發(fā)的運(yùn)動(dòng)行為,在此基礎(chǔ)上,研究了紫蘇對(duì)條件性恐懼的應(yīng)激反應(yīng),發(fā)現(xiàn)1 mg/kg迷迭香酸與4 mg/kg咖啡酸對(duì)小鼠防衛(wèi)性凍結(jié)行為持續(xù)時(shí)間顯著降低了2.12、2.4倍,但均未影響自發(fā)的運(yùn)動(dòng)活動(dòng)[81],由此推測(cè)咖啡酸和迷迭香酸除了通過抑制單胺轉(zhuǎn)運(yùn)體和單胺氧化酶外,還可能通過其他機(jī)制產(chǎn)生類似抗抑郁的活性。
3.2.4 抗炎抑菌作用 Rocha等[82]通過大鼠足水腫模型發(fā)現(xiàn),25 mg/kg迷迭香酸處理6 h可減少60%水腫,并發(fā)現(xiàn)其抗炎機(jī)制是通過激活NF-jB通路,抑制MMP-9的激活,減少促炎細(xì)胞因子的釋放。Napapan等[83-84]通過大鼠胃潰瘍模型,發(fā)現(xiàn)迷迭香酸通過抑制中粒細(xì)胞潤(rùn)濕、降低COX-2和PGE2的表達(dá),在胃黏膜中發(fā)揮了強(qiáng)大的抗炎活性,研究結(jié)果與Ghimire的基本一致。周丹等[85]研究發(fā)現(xiàn),紫蘇中酚類化合物對(duì)金黃色葡萄球菌、枯草芽孢桿菌、鼠傷寒沙門氏菌等多種細(xì)菌均具有抑菌活性,2 mg/mL的酚類物質(zhì)對(duì)鼠傷寒沙門氏菌的抑菌效果最好,MIC為0.25 mg/mL。
4 萜類化合物
4.1 萜類化合物的種類
萜類化合物是由異戊二烯為基本結(jié)構(gòu)單元的化合物及其衍生物,主要分為單萜類、半倍萜、三萜類化合物[86-87]。紫蘇中含有豐富的萜類化合物,單萜類主要有紫蘇醛、紫蘇烯、芳樟醇[66-68],半倍萜類主要有杜松醇、α-蓽澄茄油烯,三萜類化合物有齊墩果酸、熊果酸等[20-21]。萜類化合物有許多的生理活性,如抗炎抑菌、抗癌、鎮(zhèn)定、降血糖等。
4.2 功能作用
4.2.1 抗炎作用 紫蘇中的單萜類化合物具有一定的抗炎作用。BannoN等[88]通過實(shí)驗(yàn)從紫蘇中提取了9種三萜類化合物,并發(fā)現(xiàn)均能顯著抑制12-O-十四烷酰-13-乙酸酯誘導(dǎo)的小鼠耳腫脹,半數(shù)抑制劑量為0.09~0.3 mg。Xu等[89]發(fā)現(xiàn),36 mg/kg的紫蘇醛能夠減輕大鼠大腦皮質(zhì)的腦缺血/再融合損傷,表明其神經(jīng)保護(hù)作用與Akt / JNK途徑調(diào)節(jié)炎癥反應(yīng)相關(guān),炎癥細(xì)胞因子IL-1β、IL-6和TNF-α分別降低了2.89、1.64、1.79倍。通過葡聚糖硫酸鈉(DSS)誘導(dǎo)的結(jié)腸炎小鼠模型發(fā)現(xiàn),喂養(yǎng)100 mg/kg紫蘇醛可抑制結(jié)腸促炎細(xì)胞因子基因和MMP-9的表達(dá),使結(jié)腸損傷減少了35.3%[90]。通過人角質(zhì)形成細(xì)胞模型發(fā)現(xiàn),紫蘇醛不僅能夠激活細(xì)胞核因子E2相關(guān)因子2(NRF2)和血紅素加氧酶1(HO1)抗氧化途徑,還能抑制苯并芘(BaP)誘導(dǎo)的ROS產(chǎn)生和芳香烴受體(AHR)活化并抑制BaP/AHR介導(dǎo)的CCL2趨化因子的釋放,因此紫蘇醛對(duì)治療炎癥性疾病或氧化應(yīng)激相關(guān)疾病具有潛在的作用[91]。
4.2.2 抑菌作用 魏磊等[92]從紫蘇葉中提取得到三萜類化合物37.90 mg/g,并發(fā)現(xiàn)其對(duì)大腸桿菌、金黃色葡萄球菌及銅綠假單胞菌的抑菌MIC分別為0.48、0.97、0.97 mg/mL。Kang等[93]發(fā)現(xiàn),紫蘇醛具有廣譜的抗細(xì)菌和抗真菌活性,其中對(duì)高大毛霉、產(chǎn)黃青霉的抑菌效果較好,MIC為250 μg/mL,與化合物聚乙二醇聯(lián)合使用可發(fā)揮協(xié)同作用。此外,通過對(duì)櫻桃番茄腐敗真菌的研究發(fā)現(xiàn),0.4 mL/L的紫蘇醛可使黑曲霉、米曲霉、鏈孢霉和黃曲霉的生長(zhǎng)分別延遲2、3、4、6 d,對(duì)菌絲產(chǎn)生的抑制率為70.7%~92.3%,同時(shí)0.5 mL/L紫蘇醛還能夠抑制孢子的萌發(fā),IC50分別為0.190、0.191、0.228、0.254 mg/mL[94]。張嫚[95]通過對(duì)甘薯采后黑斑病的研究發(fā)現(xiàn),紫蘇醛對(duì)甘薯長(zhǎng)喙殼菌的最低抑菌濃度為0.25 μL/mL,抑菌率可達(dá)67%,作用機(jī)制是通過促進(jìn)細(xì)胞內(nèi)Ca2+、ROS的積累,進(jìn)而線粒體膜電位發(fā)生去極化,線粒體損傷,導(dǎo)致病菌凋亡。
4.2.3 抗抑郁 Ito等[96]通過強(qiáng)迫游泳實(shí)驗(yàn)與抗抑郁實(shí)驗(yàn)發(fā)現(xiàn),吸入紫蘇醛會(huì)通過嗅覺神經(jīng)系統(tǒng)表達(dá)抗抑郁作用,而不是通過皮膚吸收。Ji等[97]以LPS誘導(dǎo)的小鼠類抑郁為模型,研究了抑郁行為與抗炎活性的關(guān)系,發(fā)現(xiàn)60 mg/kg的紫蘇醛可降低尾部懸掛測(cè)試與強(qiáng)迫游泳實(shí)驗(yàn)靜止時(shí)間,分別降低了1.36、1.27倍,并發(fā)現(xiàn)其IL-6、TNF-α降低了1.75、1.46倍,前額皮質(zhì)5-羥色胺、去甲腎上腺素增加了1.75、1.27倍,因此紫蘇醛的抗抑郁活性可能與抗炎作用有關(guān)。多項(xiàng)研究表明,紫蘇葉中的紫蘇醛對(duì)慢性不可預(yù)測(cè)輕度應(yīng)激誘導(dǎo)的抑郁小鼠有抗抑郁作用,可恢復(fù)蔗糖偏好下降、減少靜止時(shí)間而不影響運(yùn)動(dòng)活動(dòng),并發(fā)現(xiàn)其抗抑郁作用是通過增加海馬腦源性神經(jīng)因子mRNA和蛋白的表達(dá)[98-99]。
5 其他組分
5.1 花色苷類化合物
豐富的花色苷類化合物和花青素是紫蘇顏色的主要來源,也是紫蘇顯著的抗氧化、抗癌等作用的物質(zhì)基礎(chǔ)。于海鑫等[100]采用微波輔助法從紫蘇葉中提取得到56.51 mg/100 g的花色苷提取物,對(duì)DPPH·、ABTS+·和O-2·的清除率分別為40.4%、52.7%、43.7%。蔡寧晨等[101]通過對(duì)比紫蘇葉花色苷與紫蘇葉水提物的抗氧化活性發(fā)現(xiàn),紫蘇葉花色苷具有較強(qiáng)的鐵離子還原/抗氧化能力、DPPH·和ABTS+·清除能力,抗氧化能力比紫蘇葉水提物高出2倍,推測(cè)作用機(jī)制與抑制氫轉(zhuǎn)移反應(yīng)過程終止自由基鏈?zhǔn)椒磻?yīng)有關(guān)。紫蘇花色苷的粗提物和純化物對(duì)大腸桿菌、金黃色葡萄球菌、蠟樣芽孢桿菌的抑制圈直徑分別為10.28、11.14、13.26和5.86、10.29、10.33 mm,MIC分別為3.125、1.563、1.563和6.25、3.125、3.125 mg/mL,紫蘇花色苷具有一定的抑菌作用但活性不是很強(qiáng),且花色苷粗提物的抑菌效果優(yōu)于純化物[102]。
5.2 多糖類化合物
紫蘇葉中除了含有揮發(fā)油、黃酮類、酚酸類等功能性成分外,多糖也是其重要的組成部分。呂長(zhǎng)鑫等[103]采用纖維素酶解法從紫蘇葉中提取多糖得率為17.9 mg/g,并發(fā)現(xiàn)多糖具有免疫調(diào)節(jié)作用。Kwon等[104]以小鼠腹膜巨噬細(xì)胞為模型,體內(nèi)試驗(yàn)發(fā)現(xiàn)紫蘇粗多糖刺激IL-6和粒細(xì)胞-巨噬細(xì)胞集落刺激因子的產(chǎn)生,體外試驗(yàn)發(fā)現(xiàn)純化多糖使NO和TNF-6的水平升高,增強(qiáng)了體外吞噬活性,對(duì)大腸桿菌、金黃色葡萄球菌等具有吞噬作用。張麗紅[105]從紫蘇中提取得到390.44 μg/mL葉多糖,對(duì)·OH、O-2·、DPPH·、ABTS+·、NO-2的清除率分別為42.03%、51.3%、83.68%、98.68%、99.05%,具有較好的抗氧化能力。
5.3 甾體化合物
目前已經(jīng)從紫蘇葉中分離出來的甾體化合物有20-異戊烷-孕甾-3β,14p-二醇、β-谷甾醇、胡蘿卜苷、菜油甾醇及豆甾醇等,具有一定的抗氧化活性和鎮(zhèn)靜等作用[62,106-107]。李會(huì)珍等[108]采用超聲波輔助法從不同品種的紫蘇中提取紫蘇甾醇,結(jié)果發(fā)現(xiàn),ZB-1品種的甾醇含量最高為2.68 mg/mL,對(duì)DPPH·、·OH的抗氧化能力最強(qiáng),IC50分別為22.37、8.70 mg/mL。研究發(fā)現(xiàn),0.75 mg/kg的豆甾醇可延長(zhǎng)以戊巴比妥誘導(dǎo)的小鼠的睡眠時(shí)間,是對(duì)照組的1.12倍;0.75 mg/kg的豆甾醇與2.5 mg/kg的紫蘇醛可使小鼠的睡眠時(shí)間提高1.43倍,其鎮(zhèn)靜作用來源于豆甾醇與紫蘇醛的協(xié)同作用[106]。
6 結(jié)論
目前,對(duì)紫蘇中揮發(fā)油類、黃酮類、酚酸類及萜類化合物的提取鑒定及其抗炎抑菌、抗氧化、抗腫瘤等生物學(xué)活性作用研究較多,對(duì)于多糖類化合物、花色苷類化合物和甾體化合物等方面的研究尚有不足。此外,對(duì)于紫蘇不同組分的研究主要集中于提取物和富集部位,對(duì)于具體成分的作用機(jī)理有待于進(jìn)一步的深入開展。紫蘇作為藥食同源的調(diào)味香料,通過飲食途徑改善人體健康是其發(fā)揮功能作用的重要途徑,因此深入開展功能組分研究意義重大。作為一種食品,在功能成分研究的基礎(chǔ)上,進(jìn)一步進(jìn)行多形式食品的開發(fā)也是紫蘇未來研究的重要內(nèi)容,對(duì)提高紫蘇的利用具有重要意義?!?/p>
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Research Advancement on Bioactive Constituents and Physiological Function of Perilla frutescens
CAO Ya,ZHANG JIN-long,WANG Qiang
(College of Cuisine and Restaurant Management,Xinjiang Vocational University,Urumqi 830000,China)
Abstract:The physiological function of bioactive constituents in Perilla frutescens,including antioxidant,anti-inflammatory,antibacterial,antitumor,antiallergy activities,regulation of glucose and lipid metabolism were reviewed,and the prospects for their application were discussed to provide theoretical basis for further development and utilization of Perilla frutescens in the future.
Keywords:Perilla frutescens;bioactive constituent;physiological function