摘 要:為研究防風(fēng)(Saposhnikovia divaricata)地上部分的抗炎活性成分,該研究采用硅膠、ODS等柱色譜方法以及高效液相技術(shù)對(duì)70%乙醇提取物進(jìn)行分離純化,并結(jié)合理化性質(zhì)及1H-NMR、13C-NMR、MS等波譜學(xué)數(shù)據(jù)對(duì)所分離化合物進(jìn)行結(jié)構(gòu)鑒定,采用脂多糖(LPS)誘導(dǎo)的RAW 264.7細(xì)胞模型測(cè)定化合物對(duì)一氧化氮(NO)的抑制活性。結(jié)果表明:(1)從防風(fēng)地上部分中分離得到15個(gè)化合物,分別鑒定為姜糖脂A (1),(E)-2-己烯基-O-β-D-吡喃葡萄糖苷(2),(Z)-3-己烯基-O-β-D-吡喃葡萄糖苷(3),正己烷基-O-β-D-吡喃葡萄糖苷(4),sachalinoside B (5),5β,6α-dihydroxy-3β-(β-D-glucopyranosyloxy)-7-megastigmen-9-one (6),phenethyl-β-D-glucopyranoside (7),沒(méi)食子酸乙酯(8),香草酸(9),蚱蜢酮(10),2-乙氧基-2-對(duì)羥基苯基乙醇(11),2-methoxy-2-(4′-hydroxyphenyl)ethanol (12),1,2,3,4,6-penta-O-gally -β-D-glucopyranose (13),(-)-當(dāng)歸棱子芹醇-2-O-β-D-呋喃芹菜糖基-(1→6)-β-D-吡喃葡萄糖苷(14),(9Z,12Z)-N-(2-hydroxyethyl)octadeca-9,12-dienamide(15)。其中,化合物1-5、7-10首次在傘形科植物中分離得到,化合物11-15首次從防風(fēng)屬植物中發(fā)現(xiàn)。(2)對(duì)化合物1-15進(jìn)行了體外抗炎活性實(shí)驗(yàn),結(jié)果表明化合物1、3、4、7、9、12、14對(duì)LPS誘導(dǎo)的RAW 264.7細(xì)胞NO釋放具有不同程度的抑制作用。
關(guān)鍵詞:防風(fēng),地上部分,化學(xué)成分,提取分離,結(jié)構(gòu)鑒定,抗炎活性
中圖分類號(hào):Q946
文獻(xiàn)標(biāo)識(shí)碼:A
文章編號(hào):1000-3142(2025)02-0207-10
基金項(xiàng)目:國(guó)家自然科學(xué)基金區(qū)域聯(lián)合創(chuàng)新基金重點(diǎn)項(xiàng)目(U22A20370); 黑龍江省重點(diǎn)研發(fā)計(jì)劃項(xiàng)目(GA21D008); 黑龍江省中醫(yī)藥管理局中醫(yī)藥科研課題項(xiàng)目(ZHY2024-001); 黑龍江省“雙一流”學(xué)科協(xié)同創(chuàng)新成果建設(shè)項(xiàng)目(LJGXCG2022-096)。
第一作者:劉振強(qiáng)(1983—),博士研究生,主要從事中藥藥效物質(zhì)基礎(chǔ)研究,(E-mail)liuzhenqiang987 @163.com。
*通信作者:楊炳友,博士,教授,主要從事中藥藥效物質(zhì)基礎(chǔ)研究,(E-mail) ybywater@163.com。
Investigation on chemical components and anti-inflammatory activities from the aerial parts of Saposhnikovia divaricata
LIU Zhenqiang1,ZHOU Shuxin1,ZHOU Luyao1,LIN Yuxuan1,LIU Shuang1,ZHANG Qian1,
SUN Yan1,CHEN Qingshan2,ZHANG Lili2,KUANG Haixue1,LIU Yan1,YANG Bingyou1*
(1. Key Laboratory of Basic and Application Research of Northern Medicine of Ministry of Education,College of Pharmacy Heilongjiang University of Chinese Medicine,Harbin 150040,China; 2. College of Agriculture,Northeast Agricultural University,Harbin 150030,China)
Abstract:In order to investigate chemical components and anti-inflammatory activities from the aerial parts of Saposhnikovia divaricata. Silica gel,ODS and HPLC,etc. were utilized for the separation and purification of the 70% ethanol extract. The structures of the isolated compounds were characterized by integrating physicochemical properties and spectroscopic data including 1H-NMR,13C-NMR,and MS. Their inhibitory activity of the compounds on nitric oxide (NO) was determined by lipopolysaccharide(LPS)-induced RAW 264.7 cell model. The results were as follow:(1)Fifteen compounds were isolated from the aerial parts of Saposhnikovia divaricata. They were identified as gingerglycolipid A (1),(E)-2-hexenyl-O-β-D-glucopyranoside (2),(Z)-3-hexenyl-O-β-D-glucopyranoside (3),hexyl-O-β-D-glucopyranoside (4),sachalinoside B (5),5β,6α-dihydroxy-3β-(β-D-glucopyranosyloxy)-7-megastigmen-9-one (6),phenethyl-β-D-glucopyranoside (7),ethylgallate (8),vanillic acid (9),grasshopper ketone (10),2-ethoxy-2-(4-hydroxyphenyl)-ethanol(11),2-methoxy-2-(4′-hydroxyphenyl)ethanol(12),1,2,3,4,6-penta-O-gally-β-D-glucopyranose(13),(-)-angelica angellinol-2-O-β-D-furan celery glycosyl-(1→6)-β-D-glucopyranoside(14),(9Z,12Z)-N-(2-hydroxyethyl)octadeca-9,12-dienamide (15). Among them,compounds 1-5 and 7-10 were isolated from plants of the Umbelliferae for the first time,and compounds 11-15 were discovered from plants of the Saposhnikovia genus for the first time. (2)In vitro anti-inflammatory activity experiments were conducted on compounds 1-15. The results showed that compounds 1,3,4,7,9,12 and 14 could inhibit the release of NO from RAW 264.7 cells induced by LPS.
Key words:Saposhnikovia divaricata,aerial part,chemical components,extraction and separation,structural identification,anti-inflammatory activity
防風(fēng)是傘形科植物防風(fēng)(Saposhnikovia divaricata)春、秋二季采挖未抽花莖植株的干燥根,主要分布于我國(guó)黑龍江、遼寧、內(nèi)蒙古等省區(qū),2020年版《中國(guó)藥典》一部記載其味辛、甘,性微溫,歸膀胱、肝、脾經(jīng),用于感冒頭痛、風(fēng)濕痹痛、風(fēng)疹瘙癢、破傷風(fēng)等(國(guó)家藥典委員會(huì),2020)。目前,國(guó)內(nèi)外學(xué)者對(duì)防風(fēng)進(jìn)行的研究主要集中在其根部,即藥用部位,發(fā)現(xiàn)其化學(xué)成分主要包括色原酮類、香豆素類、多糖類和揮發(fā)油(常潞等,2022)等,具有鎮(zhèn)痛、抗炎、解熱(楊波等,2006)、抗過(guò)敏(吳賢波等,2016)、抗腫瘤(Ding et al.,2020)、抗氧化(Tai amp; Cheung,2007)等藥理作用。然而防風(fēng)屬于我國(guó)傳統(tǒng)的大宗藥材,作為玉屏風(fēng)散、防風(fēng)通圣顆粒等中成藥的原料藥,不斷擴(kuò)大的市場(chǎng)需求量導(dǎo)致資源的急劇減少,在采摘過(guò)程中其非藥用部位常被作為廢料丟棄,造成資源浪費(fèi)。為充分開(kāi)發(fā)和利用該中藥資源,豐富其抗炎活性物質(zhì)基礎(chǔ),緩解市場(chǎng)供應(yīng)緊缺的問(wèn)題,該課題組對(duì)防風(fēng)地上部分化學(xué)成分作了進(jìn)一步研究,共分離鑒定出15種化合物,采用脂多糖(LPS)誘導(dǎo)的小鼠巨噬細(xì)胞RAW 264.7炎癥反應(yīng)模型,以炎癥細(xì)胞NO產(chǎn)生抑制率為評(píng)價(jià)指標(biāo),對(duì)分離出的化合物1-15進(jìn)行了抗炎活性測(cè)定,結(jié)果顯示化合物1、3、4、7、9、12、14對(duì)LPS誘導(dǎo)的RAW 264.7細(xì)胞NO釋放具有不同程度的抑制作用,其中化合物4活性最高,為防風(fēng)非藥用部位的資源化利用以及進(jìn)一步研究其抗炎作用機(jī)制提供依據(jù)。
1 材料、儀器與試劑
1.1 材料
防風(fēng)采自黑龍江省大慶市,經(jīng)黑龍江中醫(yī)藥大學(xué)藥學(xué)院藥用植物學(xué)教研室樊銳鋒副教授鑒定為傘形科植物防風(fēng)(Saposhnikovia divaricata)的干燥地上部分,標(biāo)本保存于黑龍江中醫(yī)藥大學(xué)中藥化學(xué)教研室(編號(hào)為20220812);巨噬細(xì)胞(RAW 264.7)購(gòu)于武漢大學(xué)細(xì)胞保藏中心。
1.2 儀器和試劑
2424-2998型分析HPLC(美國(guó)Waters公司);CBM-20A型示差折光檢測(cè)器(日本島津公司);Bruker-600超導(dǎo)核磁共振光譜儀(德國(guó)Bruker公司);旋轉(zhuǎn)蒸發(fā)儀(日本東京理化公司);超高效液相色譜系統(tǒng)(美國(guó)Thermo Fisher Scientific公司);UHPLC-orbitrap-MS質(zhì)譜系統(tǒng)(美國(guó)Thermo Fisher Scientific公司);ELx 800酶標(biāo)儀(美國(guó)BioTek公司);BT 25S型電子分析天平(德國(guó)Sartorius公司);150i型二氧化碳培養(yǎng)箱(美國(guó)Thermo Fisher Scientific公司);Vert-A1型熒光倒置顯微鏡(德國(guó)Carl Zeiss公司);TDL-4型低速離心機(jī)(上海安亭科學(xué)儀器廠);WT-1ND超凈臺(tái)(北京王堂藍(lán)翼科技有限公司);分析型色譜柱,半制備型色譜柱,制備型色譜柱(美國(guó)Waters公司);柱層析硅膠(青島海洋化工廠);薄層色譜用硅膠板(德國(guó)Merck公司);地塞米松(DXMS,廣東南國(guó)藥業(yè)有限公司);胎牛血清(FBS,美國(guó)Gibco公司);DMEM培養(yǎng)基(美國(guó)Gibco公司);青霉素-鏈霉素-兩性霉素B (3抗)(上海碧云天公司);二甲基亞砜(DMSO,美國(guó)Sigma-Aldrich公司);一氧化氮檢測(cè)試劑盒(上海碧云天公司);脂多糖(LPS,美國(guó)Sigma-Aldrich公司);96孔板(美國(guó)Corning公司);色譜層析用化學(xué)試劑(分析純,天津試劑一廠)。
2 研究方法
2.1 提取和分離
稱取干燥防風(fēng)地上部分20.0 kg,用70%乙醇(10倍量)加熱回流提取2次,每次2 h,旋轉(zhuǎn)蒸發(fā)儀減壓濃縮,回收溶劑得防風(fēng)提取物浸膏6.3 kg,出膏率為31.5%。取1.3 kg浸膏均勻溶于蒸餾水中,采用大孔樹(shù)脂HP-20對(duì)其進(jìn)行分離,得到10%乙醇組分147.0 g、50%乙醇組分300.0 g、70%乙醇組分330.0 g和95%乙醇組分23.2 g。
取300.0 g防風(fēng)50%乙醇洗脫部位,采用硅膠柱層析法,使用二氯甲烷-甲醇(1∶0→0∶1)作為洗脫劑進(jìn)行梯度洗脫,得到7個(gè)餾分,即Fr.A-Fr.G。Fr.D經(jīng)ODS反相柱色譜以甲醇-水為洗脫劑(1∶9→1∶0)進(jìn)行分離,得到15個(gè)組分(Fr.D1-Fr.D15),將Fr.D3經(jīng)硅膠柱層析法,以二氯甲烷-甲醇(25∶1→0∶1)體系進(jìn)行梯度洗脫,得到7個(gè)組分(Fr.D3-1-Fr.D3-7)。將Fr.D3-4經(jīng)半制備HPLC(MeOH/H2O=42%)分離得到化合物9(6.7 mg)。將Fr.D3-5經(jīng)半制備型HPLC(MeOH/H2O=44%)分離得到化合物8(5.8 mg)和化合物10(10.6 mg)。Fr.F經(jīng)ODS反相柱色譜以甲醇-水為洗脫劑(1∶9→1∶0)進(jìn)行分離,得到59個(gè)組分(Fr.F1-Fr.F59),F(xiàn)r.F12經(jīng)半制備型HPLC(MeOH/H2O=38%)分離得到化合物14(5.6 mg)。Fr.F31經(jīng)半制備型HPLC(MeOH/H2O=60%)分離得到化合物13(5.6 mg)。Fr.F33經(jīng)半制備型HPLC(MeOH/H2O=58%)分離得到化合物1(9.8 mg)。Fr.G經(jīng)ODS反相柱色譜以甲醇-水為洗脫劑(1∶9→1∶0)進(jìn)行分離,得到50個(gè)組分(Fr.G1-Fr.G50),F(xiàn)r.G12經(jīng)半制備型HPLC(MeOH/H2O=32%)分離得到化合物15(8.6 mg)。
使用正相硅膠柱色譜將70%乙醇洗脫部位(295.6 g)進(jìn)行分離,流動(dòng)相采用二氯甲烷-甲醇(1∶0→0∶1)進(jìn)行梯度洗脫。旋轉(zhuǎn)蒸發(fā)儀濃縮之后通過(guò)薄層色譜并結(jié)合分析型HPLC進(jìn)行檢識(shí)合并,得到8個(gè)組分(即Fr.1-Fr.8)。Fr.2經(jīng)ODS反相柱色譜以甲醇-水為洗脫劑(1∶9→1∶0)進(jìn)行分離,得到6個(gè)組分Fr.2A-Fr.2F,F(xiàn)r.2B經(jīng)制備型HPLC分離得化合物2(5.5 mg)、化合物3(14.4 mg)、化合物6(4.3 mg)。Fr.2C經(jīng)制備型HPLC分離得化合物7(7.2 mg)。Fr.2D經(jīng)制備型HPLC分離得化合物4(6.3 mg)、化合物5(13.0 mg)。Fr.3經(jīng)ODS反相柱色譜以甲醇-水為洗脫劑(1∶9→1∶0)進(jìn)行分離,得到3個(gè)組分Fr.3A-Fr.3C,F(xiàn)r.3A經(jīng)半制備型HPLC分離得化合物11(5.2 mg)、化合物12(3.9 mg)?;衔?-15的結(jié)構(gòu)如圖1所示。
2.2 抗炎活性
2.2.1 供試品溶液的配置
2.2.1.1 待測(cè)化合物配置 取化合物1-15適量,用少量二甲基亞礬(DMSO)溶解成母液,使用前用DMEM培養(yǎng)基稀釋至所需濃度。
2.2.1.2 LPS溶液配置 在紫外燈消毒半小時(shí)后的超凈臺(tái)中精密稱取10 mg LPS粉末配制成為1 mg·mL-1的儲(chǔ)存液并進(jìn)行分裝后,于-20 ℃儲(chǔ)存?zhèn)溆?。?shí)驗(yàn)時(shí)將儲(chǔ)備液稀釋至1 μg·mL-1的終濃度。
2.2.1.3 陽(yáng)性藥配置 精密稱取地塞米松(DXMS)藥品1.57 mg,溶于2 mL含1% DMSO的DMEM培養(yǎng)基中,配成2 mmol·L-1的陽(yáng)性藥溶液(母液),于-80 ℃凍存?zhèn)溆?。使用時(shí)將其稀釋至10 μmol·L-1的工作濃度,采用同等操作制備DMSO對(duì)照液。
2.2.2 細(xì)胞培養(yǎng)
將含有RAW細(xì)胞的凍存管(1 mL),放入37 ℃水浴鍋中搖晃解凍,而后混合物以1 000 r·min-1轉(zhuǎn)速離心5 min,棄去上清液,加入1 mL的含10%胎牛血清和1% 3抗(青霉素-鏈霉素-兩性霉素B)的DMEM。將所有細(xì)胞懸液轉(zhuǎn)至含已預(yù)熱4 mL培養(yǎng)基的T-25培養(yǎng)瓶中,并放置于37 ℃、5%CO2的細(xì)胞培養(yǎng)箱中培養(yǎng)過(guò)夜。待細(xì)胞長(zhǎng)至80%~90%時(shí)進(jìn)行傳代。
棄去培養(yǎng)上清液,用2 mL無(wú)菌預(yù)冷的PBS清洗1次,拍打培養(yǎng)瓶后加入2 mL細(xì)胞培養(yǎng)基并吹打培養(yǎng)基,取1 mL細(xì)胞懸液轉(zhuǎn)至含已預(yù)熱4 mL培養(yǎng)基的T-25培養(yǎng)瓶中培養(yǎng)。
2.2.3 化合物抑制RAW 264.7細(xì)胞NO生成實(shí)驗(yàn)
RAW 264.7細(xì)胞采取2.2.2項(xiàng)的方法培養(yǎng)至取對(duì)數(shù)生長(zhǎng)期,將孔板劃分為空白組、模型組、給藥組和陽(yáng)性藥組,每組設(shè)4個(gè)復(fù)孔,鋪板后,96孔板置培養(yǎng)箱(37 ℃,5% CO2)中過(guò)夜后去除培養(yǎng)基(空白組除外),其余加入100 μL含1 μg·mL-1 LPS的DMEM培養(yǎng)基孵育,24 h后,測(cè)得其NO分泌量明顯增加,說(shuō)明已制得炎癥反應(yīng)模型;空白組和模型組加入100 μL DMEM培養(yǎng)基,給藥組加入100 μL含各濃度(終濃度為100、50、25、12.5、 6.25、 3.125 μmol·L-1)化合物1-15的DMEM培養(yǎng)基,DXMS作為陽(yáng)性藥。各組繼續(xù)培養(yǎng)24 h后,在避光條件下,各孔取上清液50 μL轉(zhuǎn)至其他空白孔板中,分別加入Griess試劑A液和B液各50 μL,于540 nm波長(zhǎng)檢測(cè)各孔OD值。根據(jù)公式計(jì)算其抑制率,并用GraphPad Prism Version 9.0軟件計(jì)算IC50值。其中,抑制率計(jì)算公式如下:
NO產(chǎn)生抑制率(%)=(OD模型組-OD給藥組)/(OD模型組-OD空白組)×100。
2.3 統(tǒng)計(jì)分析
采用GraphPad Prism Version 9.0軟件進(jìn)行統(tǒng)計(jì)分析,通過(guò)單因素方差 (ANOVA) 分析方法進(jìn)行組間比較,實(shí)驗(yàn)數(shù)據(jù)以平均值±標(biāo)準(zhǔn)差表示。
3 結(jié)果與分析
3.1 化合物的結(jié)構(gòu)鑒定
化合物1 白色粉末,溶于甲醇。分子式為C33H56O14,m/z:675.4 [M-H]-。1H-NMR (600 MHz,C5D5N) δH 2.31 (2H,t,J = 7.5 Hz,H-2),1.26 (10H,m,H-3,4,5,6,7),1.58 (2H,m,H-8),5.46 (6H,m,H-9,10,12,13,15,16),2.92 (2H,t,J = 5.5 Hz,H-11),2.89 (2H,t,J = 5.5 Hz,H-14),2.06 (2H,m,H-17),0.92 (3H,t,J = 7.6 Hz,H-18),4.64 (2H,m,H-1′),3.54 (1H,m,H-2′),4.14 (2H,t,J = 6.7 Hz,H-3′),4.78 (1H,d,J = 7.1 Hz,H-1″),4.32 (1H,dd,J = 10.4,5.9 Hz,H-2″),4.29 (1H,dd,J = 10.8,5.7 Hz,H-3″),4.55 (1H,m,H-4″),4.49 (1H,overlap,H-5″),4.36 (1H,dd,J = 10.8,6.2 Hz,H-6″a),4.57 (1H,m,H-6″b),4.78 (1H,d,J = 7.7 Hz,H-1),4.03 (1H,dd,J = 10.0,5.1 Hz,H-2),4.46 (1H,t,J = 4.4 Hz,H-3),4.52 (1H,overlap,H-4),4.47 (1H,overlap,H-5),3.43 (1H,d,J = 15.4 Hz,H-6a),4.40 (1H,m,H-6b); 13C-NMR (150 MHz,C5D5N) δC 173.5 (C-1),34.1 (C-2),20.7 (C-3),25.0 (C-4),25.7 (C-5),25.8 (C-6),27.3 (C-7),29.3 (C-8),127.9 (C-9),128.0 (C-10),29.2 (C-11,14),128.5 (C-12,13),130. 4(C-15),132.0 (C-16),29.7 (C-17),14.3 (C-18),72.0 (C-1′),68.9 (C-2′),66.4 (C-3′),105.5 (C-1″),72.6 (C-2″),74.9 (C-3″),70.4 (C-4″),74.3 (C-5″),68.0 (C-6″),101.0 (C-1),69.8 (C-2),72.0 (C-3),71.5 (C-4),72.3 (C-5),62.3 (C-6)。以上數(shù)據(jù)與來(lái)國(guó)防等(2008)報(bào)道基本一致,故鑒定化合物1為姜糖脂A(gingerglycolipid A)。
化合物2 無(wú)色糖漿狀物質(zhì),溶于甲醇。分子式為C12H22O6,m/z:261.1 [M-H]-。1H-NMR (600 MHz,CD3OD) δH 4.09 (1H,dd,J = 11.9,6.8 Hz,H-1a),4.31 (1H,m,H-1b),5.60 (1H,m,H-2),5.74 (1H,m,H-3),2.03 (2H,q,J = 7.0 Hz,H-4),1.42 (2H,qt,J = 14.6,7.3 Hz,H-5),0.92 (3H,t,J = 7.3 Hz,H-6),4.31 (1H,d,J = 7.8 Hz,H-1′),3.23 (1H,m,H-2′),3.34 (1H,m,H-3′),3.18 (1H,m,H-4′),3.28 (1H,t,J = 9.6 Hz,H-5′),3.66 (1H,dd,J = 11.9,5.7 Hz,H-6′a),3.86 (1H,dd,J = 11.9,2.3 Hz,H-6′b); 13C-NMR (150 MHz,CD3OD) δC 71.0 (C-1),127.5 (C-2),136.0 (C-3),35.6 (C-4),23.5 (C-5),14.1 (C-6),103.1 (C-1′),75.2 (C-2′),78.3 (C-3′),71.8 (C-4′),78.1 (C-5′),62.9 (C-6′)。以上數(shù)據(jù)與李帥等(2004)報(bào)道基本一致,故鑒定化合物2為(E)-2-己烯基-O-β-D-吡喃葡萄糖苷 [(E)-2-hexenyl-O-β-D-glucopyranoside]。
化合物3 無(wú)色針狀結(jié)晶,溶于甲醇。分子式為C11H19O6,m/z:285.1 [M+Na]+。1H-NMR (600 MHz,C5D5N) δH 3.69 (1H,dd,J = 16.4,7.6 Hz,H-1a),4.09 (1H,dd,J = 16.4,7.6 Hz,H-1b),2.44 (2H,q,J = 7.1 Hz,H-2),5.41 (1H,m,H-3),5.46 (1H,m,H-4),1.93 (2H,m,H-5),0.83 (3H,t,J = 7.5 Hz,H-6),4.86 (1H,d,J = 7.7 Hz,H-1′),4.04 (1H,m,H-2′),4.27 (1H,m,H-3′),3.94 (1H,m,H-4′),4.24 (1H,m,H-5′),4.39 (1H,dd,J = 11.8,5.3 Hz,H-6′a),4.55 (1H,d,J = 11.8 Hz,H-6′b); 13C-NMR (150 MHz,C5D5N) δC 69.3 (C-1),28.3 (C-2),125.4 (C-3),133.4 (C-4),20.7 (C-5),14.3 (C-6),104.6 (C-1′),75.1 (C-2′),78.5 (C-3′),71.6 (C-4′),78.4 (C-5′),62.7 (C-6′)。以上數(shù)據(jù)與Lee等(2008)報(bào)道基本一致,故鑒定化合物3為(Z)-3-己烯基-O-β-D-吡喃葡萄糖苷 [(Z)-3-hexenyl-O-β-D-glucopyranoside]。
化合物4 無(wú)色糖漿狀物質(zhì),溶于甲醇。分子式為C12H24O6,m/z:263.2 [M-H]-。 1H-NMR (600 MHz,CD3OD) δH 3.53 (1H,dt,J = 9.5,6.8 Hz,H-1a),3.90 (1H,d,J = 9.5,6.8 Hz,H-1b),1.62 (2H,m,H-2),1.39 (2H,m,H-3),1.34 (2H,m,H-4),1.31 (2H,m,H-5),0.91 (3H,t,J = 6.8 Hz,H-6),4.24 (1H,d,J = 7.8 Hz,H-1′),3.17 (1H,dd,J = 9.1,7.8 Hz,H-2′),3.35 (1H,m,H-3′),3.30 (1H,m,H-4′),3.26 (1H,m,H-5′),3.67 (1H,dd,J = 11.9,5.4 Hz,H-6′a),3.86 (1H,dd,J = 11.9,2.1 Hz,H-6′b); 13C-NMR (150 MHz,CD3OD) δC 70.9 (C-1),30.8 (C-2),26.8 (C-3),32.9 (C-4),23.7 (C-5),14.4 (C-6),104.4 (C-1′),75.1 (C-2′),78.1 (C-3′),71.7 (C-4′),77.9 (C-5′),62.8 (C-6′)。以上數(shù)據(jù)與李帥等(2004)報(bào)道基本一致,故鑒定化合物4為正己烷基-O-β-D-吡喃葡萄糖苷(hexyl-O-D-β-glucopyranoside)。
化合物5 白色粉末,溶于甲醇。分子式為C16H28O7,m/z:331.2 [M-H]-。1H-NMR (600 MHz,CD3OD) δH 4.98 (1H,dd,J = 10.9,1.1 Hz,H-1a),5.22 (1H,br.d,J = 17.4 Hz,H-1b),6.00 (1H,dd,J = 17.4,10.9 Hz,H-2),4.08 (1H,t,J = 7.0 Hz,H-4),1.88 (2H,m,H-5),1.81 (2H,m,H-6),1.23 (3H,s,H-8),1.26 (3H,s,H-9),1.29 (3H,s,H-10),4.57 (1H,d,J = 7.8 Hz,H-1′),3.15 (1H,t,J = 7.8 Hz,H-2′),3.37 (1H,m,H-4′),3.65 (1H,dd,J = 11.9,5.5 Hz,H-6′a),3.82 (1H,dd,J = 11.9,2.1 Hz,H-6′b); 13C-NMR (150 MHz,CD3OD) δC 111.9 (C-1),145.4 (C-2),80.0 (C-3),85.2 (C-4),38.7 (C-5),28.1 (C-6),84.4 (C-7),22.7 (C-8),25.9 (C-9),23.4 (C-10),98.4 (C-1′),75.4 (C-2′),77.7 (C-3′),71.7 (C-4′),78.1 (C-5′),62.8 (C-6′)。以上數(shù)據(jù)與Fan等(2001)報(bào)道基本一致,故鑒定化合物5為sachalinoside B。
化合物6 淡黃色固體,溶于甲醇。分子式為C19H32O9,m/z:409.2 [M+Na-H2O]+。1H-NMR (600 MHz,CD3OD) δH 1.40 (1H,dd,J = 13.1,10.1 Hz,H-2a),1.76 (1H,ddd,J = 13.1,3.3,1.2 Hz,H-2b),3.93 (1H,m,H-3),1.80 (1H,dd,J = 14.9,8.5 Hz,H-4a),2.42 (1H,ddd,J = 14.6,5.0,1.1 Hz,H-4b),7.19 (1H,d,J = 15.8 Hz,H-7),6.19 (1H,d,J = 15.8 Hz,H-8),2.29 (3H,s,H-10),0.96 (3H,s,H-11),1.21 (3H,s,H-12),1.19 (3H,s,H-13),4.34 (1H,d,J = 7.8 Hz,H-1′),3.13 (1H,m,H-2′),3.36 (1H,m,H-3′),3.30 (2H,m,H-4′,5′),3.67 (1H,dd,J = 11.9,5.3 Hz,H-6′a),3.90 (1H,dd,J = 11.9,1.9 Hz,H-6′b); 13C-NMR (150 MHz,CD3OD) δC 36.1 (C-1),45.4 (C-2),72.9 (C-3),38.3 (C-4),68.5 (C-5),71.3 (C-6),145.5 (C-7),134.0 (C-8),200.4 (C-9),27.6 (C-10),25.6 (C-11),29.6 (C-12),20.3 (C-13),103.1 (C-1′),75.3 (C-2′),78.0 (C-3′),71.8 (C-4′),78.3 (C-5′),62.9 (C-6′)。以上數(shù)據(jù)與Zhang等(2012)報(bào)道基本一致,故鑒定化合物6為5β,6α-dihydroxy-3β-(β-D-glucoyranosyloxy)-7-megastigmen-9-one。
化合物7 白色粉末,溶于甲醇。分子式為C14H20O6,m/z:329.1 [M+COOH]-。1H-NMR (600 MHz,CD3OD) δH 7.26 (4H,m,J = 4.4 Hz,H-2,3,5,6),7.17 (1H,m,H-4),2.94 (2H,m,H-7),3.75 (1H,m,H-8a),4.09 (1H,m,H-8b),4.30 (1H,d,J = 8.0 Hz,H-1′),3.18 (1H,t,J = 8.0 Hz,H-2′),3.28 (2H,m,H-3′,5′),3.30 (1H,overlap,H-4′),3.66 (1H,dd,J = 12.0,5.2 Hz,H-6′a),3.86 (1H,dd,J = 12.0,1.7 Hz,H-6′b); 13C-NMR (150 MHz,CD3OD) δC 140.1 (C-1),130.0 (C-2,6),129.3 (C-3,5),127.2 (C-4),37.2 (C-7),71.7 (C-8),104.4 (C-1′),75.1 (C-2′),78.1 (C-3′),71.7 (C-4′),78.0 (C-5′),62.8 (C-6′)。以上數(shù)據(jù)與張祎等(2013)報(bào)道基本一致,故鑒定化合物7為phenethyl-β-D-glucopyranoside。
化合物8 白色針狀結(jié)晶,溶于甲醇。熔點(diǎn)為140~142 ℃,分子式為C9H10O5,m/z:197.1 [M-H]-。1H-NMR (600 MHz,CD3OD) δH 7.05 (2H,s,H-6),4.28 (2H,q,J = 7.2 Hz,H-8),1.34 (3H,t,J = 7.2 Hz,H-9); 13C-NMR (150 MHz,CD3OD) δC 168.5 (C-1),146.5 (C-2,3),139.7 (C-4),121.8 (C-5),110.0 (C-6,7),61.7 (C-8),14.6 (C-9)。以上數(shù)據(jù)與Zhou等(2007)報(bào)道基本一致,故鑒定化合物8為沒(méi)食子酸乙酯(ethylgallate)。
化合物9 白色針狀晶體,溶于甲醇。熔點(diǎn)為210~212 ℃,分子式為C8H8O4,m/z:167.0 [M-H]-。1H-NMR (600 MHz,CD3OD) δH 7.55 (1H,d,J = 1.9 Hz,H-2),6.84 (1H,d,J = 8.7 Hz,H-5),7.56 (1H,dd,J = 8.7,1.9 Hz,H-6),3.89 (3H,s,OCH3); 13C-NMR (150 MHz,CD3OD) δC 123.0 (C-1),113.8 (C-2),152.6 (C-3),148.6 (C-4),115.8 (C-5),125.2 (C-6),56.4 (OCH3),170.1 (CO)。以上數(shù)據(jù)與Prachayasittikul等(2009)報(bào)道基本一致,故鑒定化合物9為香草酸(vanillic acid)。
化合物10 白色無(wú)定形粉末,溶于甲醇。分子式為C13H20O3,m/z:247.1 [M+Na]+。1H-NMR (600 MHz,CD3OD) δH 1.93 (1H,m,H-2a),1.41 (1H,m,H-2b),4.21 (1H,m,H-3),2.21 (1H,overlap,H-4a),1.34 (1H,m,H-4b),5.82 (1H,s,H-8),2.19 (3H,s,H-10),1.15 (3H,s,H-11),1.38 (6H,s,H-12,13); 13C-NMR (150 MHz,CD3OD) δC 37.0 (C-1),49.9 (C-2),64.4 (C-3),49.7 (C-4),72.4 (C-5),119.9 (C-6),211.5 (C-7),101.1 (C-8),200.8 (C-9),26.5 (C-10),29.3 (C-11),32.3 (C-12),30.8 (C-13)。以上數(shù)據(jù)與Ren等(2013)報(bào)道基本一致,故鑒定化合物10為蚱蜢酮(grasshopper ketone)。
化合物11 無(wú)色油狀物,溶于甲醇。熔點(diǎn)為99~100 ℃,分子式為C10H14O3,m/z:181.1 [M-H]-。1H-NMR (600 MHz,CD3OD) δH 3.62 (1H,dd,J = 11.6,8.1 Hz,H-1b),3.49 (1H,J = 11.6,4.0 Hz,H-1a),4.27 (1H,dd,J = 8.1,4.0 Hz,H-2),6.76 (2H,d,J = 8.4 Hz,H-4,8),7.13 (2H,d,J = 8.4 Hz,H-5,7),3.40 (2H,d,J = 7.0 Hz,H-1′),1.16 (3H,t,J = 7.0 Hz,H-2′); 13C-NMR (150 MHz,CD3OD) δC 67.8 (C-1),84.0 (C-2),131.6 (C-3),116.2 (C-4,8),131.6 (C-5),158.2 (C-6),129.2 (C-7),65.1 (C-1′),15.5 (C-2′)。以上數(shù)據(jù)與韋瑋等(2016)報(bào)道基本一致,故鑒定化合物11為2-乙氧基-2-對(duì)羥基苯基乙醇[2-ethoxy-2-(4-hydroxyphenyl)-ethanol]。
化合物12 無(wú)定形狀粉末,溶于甲醇。分子式為C9H12O3,m/z:191.1 [M+Na]+。1H-NMR (600 MHz,CD3OD) δH 3.49 (1H,dd,J = 11.6,3.8 Hz,H-1a),3.62 (1H,dd,J = 11.6,8.3 Hz,H-1b),4.16 (1H,dd,J = 8.3,3.8 Hz,H-2),7.12 (2H,d,J = 8.5 Hz,H-2′,6′),6.77 (2H,d,J = 8.5 Hz,H-3′,5′),3.23 (3H,s,2-OCH3); 13C-NMR (150 MHz,CD3OD) δC 67.8 (C-1),86.0 (C-2),130.9 (C-1′),129.3 (C-2′),116.8 (C-3′),158.4 (C-4′),116.2 (C-5′),129.3 (C-6′),56.8 (2-OCH3)。以上數(shù)據(jù)與Matsumura等(2002)報(bào)道基本一致,故鑒定化合物12為2-methoxy-2-(4′-hydroxyphenyl)ethanol。
化合物13 淺棕色粉末,溶于甲醇。熔點(diǎn)為203~204 ℃,分子式為C41H32O26,m/z:963.1 [M+Na]+。1H-NMR (600 MHz,CD3OD) δH 6.24 (1H,d,J = 8.3 Hz,H-1),5.59 (1H,overlap,H-2),5.62 (1H,t,J = 9.6 Hz,H-3),5.62 (1H,overlap,H-4),4.41 (1H,overlap,H-5),4.52 (1H,brd,J = 10.9 Hz,H-6),5.91 (1H,t,J = 10.9 Hz,H-6),7.12,7.06,6.99,6.96,6.91 (10H,s,H-2′,6′,2″,6″,2,6,2′,6′,2″,6″); 13C-NMR (150 MHz,CD3OD) δC 167.9 (1′-CO),167.3 (1″-CO),167.0 (1-CO),166.9 (1′-CO),166.2 (1″-CO),121.0 (C-1′),120.4 (C-1″),120.2 (C-1),120.2 (C-1′),119.7 (C-1″),110.6 (C-2′,6′),110.5 (C-2″,6″),110.4 (C-2,6),110.4 (C-2′,6′),110.4 (C-2″,6″),146.5 (C-3′,5′,C-3,5),146.5 (C-3″,5″),146.4 (C-3′,5′),146.3 (C-3″,5″),140.8 (C-4′),140.3 (C-4″),140.3 (C-4),140.1 (C-4′),140.0 (C-4″),93.8 (C-1),72.2 (C-2),74.1 (C-3),69.8 (C-4),74.4 (C-5),63.1(C-6)。以上數(shù)據(jù)與Cui等(2002)報(bào)道基本一致,故鑒定化合物13為1,2,3,4,6-penta-O-gally-β-D-glucopyranose。
化合物14 白色固體,溶于甲醇。分子式為C21H36O11,m/z:465.2 [M+H]+。1H-NMR (600 MHz,CD3OD) δH 4.00 (1H,m,H-2),1.03 (1H,dd,J = 13.6,2.6 Hz,H-3),2.22 (1H,m,H-3),1.71 (1H,d,J = 4.9 Hz,H-4),3.87 (1H,dd,J = 7.6,2.9 Hz,H-5),2.49 (1H,dd,J = 13.2,8.0 Hz,H-6),1.34 (1H,brd,J = 13.5 Hz,H-6),0.87 (3H,s,H-8),1.10 (3H,s,H-9),0.95 (3H,s,H-10),4.21 (1H,d,J = 7.8 Hz,H-1′),3.16 (1H,t,J = 8.1 Hz,H-2′),3.30 (1H,m,H-3′),3.25 (1H,m,H-4′),3.26 (1H,m,H-5′),3.95 (1H,m,H-6′),3.62 (1H,dd,J = 11.2,6.1 Hz,H-6′),5.02 (1H,d,J = 1.8 Hz,H-1″),3.90 (1H,d,J = 1.8 Hz,H-2″),3.77 (1H,d,J = 9.6 Hz,H-4″),3.95 (1H,d,J = 9.6 Hz,H-4″),3.59 (2H,s,H-5″); 13C-NMR (150 MHz,CD3OD) δC 48.8 (C-1),83.5 (C-2),34.5 (C-3),53.6 (C-4),75.9 (C-5),39.7 (C-6),51.1 (C-7),20.4 (C-8),21.4 (C-9),13.4 (C-10),103.1 (C-1′),75.1 (C-2′),76.8 (C-3′),71.8 (C-4′),78.2 (C-5′),68.4 (C-6′),110.9 (C-1″),78.0 (C-2″),80.6 (C-3″),75.0 (C-4″),65.8 (C-5″)。以上數(shù)據(jù)與劉艷等(2021)報(bào)道基本一致,故鑒定化合物14為(-)-當(dāng)歸棱子芹醇-2-O-β-D-呋喃芹菜糖基-(1→6)-β-D-吡喃葡萄糖苷[(-)-angelica angellinol-2-O-β-D-furan celery glycosyl-(1→6)-β-D-glucopyranoside]。
化合物15 無(wú)色油狀物,溶于甲醇。熔點(diǎn)為38~40 ℃,分子式為C20H37NO2,m/z:322.3 [M-H]-。1H-NMR (600 MHz,CD3OD) δH 2.39 (2H,t,J = 8.8 Hz,H-2),1.80 (2H,m,H-3),1.24 (2H,m,H-4),1.25 (2H,m,H-5),1.26 (2H,m,H-6),1.28 (2H,m,H-7),2.06 (4H,m,H-8,14),5.32 (1H,m,H-9),5.34 (1H,m,H-10),2.90 (2H,m,H-11),5.47 (2H,m,H-12,13),1.30 (2H,m,H-15),1.32 (2H,m,H-16),1.33 (2H,m,H-17),0.89 (3H,t,J = 7.0 Hz,H-18),3.47 (2H,m,H-1′),3.75 (2H,m,H-2′); 13C-NMR (150 MHz,CD3OD) δC 173.4 (C-1),26.2 (C-2),36.6 (C-3),29.3 (C-4),29.5 (C-5),29.5 (C-6),29.8 (C-7),27.4 (C-8),130.3 (C-9),128.3 (C-10),25.9 (C-11),128.3 (C-12),130.3 (C-13),27.4 (C-14),29.6 (C-15),31.6 (C-16),22.7 (C-17),14.1 (C-18),43.0 (C-1′),61.6 (C-2′)。以上數(shù)據(jù)與Yang等(2021)報(bào)道基本一致,故鑒定化合物15為(9Z,12Z)-N-(2-hydroxyethyl)octadeca-9,12-dienamide。
3.2 抗炎活性
模型組給予LPS刺激后,RAW 264.7細(xì)胞NO生成含量與未刺激的空白組相比顯著升高,說(shuō)明炎癥細(xì)胞模型成功。將分離得到的單體給藥與模型組相比,IC50值大于50 μmol·L-1,判定為無(wú)NO生成抑制活性,在篩選結(jié)果中,化合物1、3、4、7、9、12、14對(duì)LPS刺激RAW 264.7細(xì)胞釋放的炎癥因子NO具有不同程度的抑制作用,顯示了較好的體外抗炎活性,其中化合物4對(duì)炎癥因子的抑制作用最強(qiáng),具體實(shí)驗(yàn)結(jié)果見(jiàn)表1。
4 討論與結(jié)論
防風(fēng)作為我國(guó)的傳統(tǒng)中藥材,具有祛風(fēng)解表、勝濕止痛、止痙等功效,目前較多學(xué)者研究防風(fēng)藥用部位資源,其中香豆素、多糖、色原酮等化合物是其發(fā)揮鎮(zhèn)痛、抗炎、解熱、抗過(guò)敏等藥理作用的主要藥效成分(曹思思等,2021),而對(duì)其非藥用部位化學(xué)成分研究報(bào)道較少。本實(shí)驗(yàn)對(duì)防風(fēng)地上部分化學(xué)成分進(jìn)行研究,共分離并鑒定15種化合物,其中化合物1、2、3、4是脂肪苷類,化合物8、9、11、12、13是酚類,化合物5、6、10、14是單萜類,化合物7是芳香苷類,化合物15是生物堿類。化合物1-5、7-10為首次從傘形科植物中分離得到,化合物11-15為首次從防風(fēng)屬植物種分離得到。
炎癥是動(dòng)物機(jī)體受到各種致炎因子損傷時(shí),產(chǎn)生的防御反應(yīng),是一種損傷和抗損傷同時(shí)存在的病理過(guò)程。炎癥的發(fā)病機(jī)制與促炎因子(NO、IL-6和IL-1β等)的過(guò)度分泌相關(guān),抑制它們的產(chǎn)生是治療疾病的重要手段之一。而RAW 264.7細(xì)胞是一種常用的細(xì)胞系,被廣泛應(yīng)用于各種化合物、提取物、藥物等成分的活性驗(yàn)證及信號(hào)通路調(diào)控機(jī)制等研究。本研究采用LPS誘導(dǎo)的RAW 264.7細(xì)胞模型對(duì)分離得到的單體化合物進(jìn)行體外活性研究,發(fā)現(xiàn)化合物1、3、4、7、9、12、14對(duì)LPS誘導(dǎo)的RAW 264.7細(xì)胞NO的釋放具有不同程度的抑制作用,其中化合物4(脂肪苷類)活性最高,IC50為(9.48±1.68) μmol·L-1。結(jié)果表明,防風(fēng)地上部分有望用于治療炎癥性疾病,但其抗炎作用機(jī)制有待進(jìn)一步研究。此外,據(jù)文獻(xiàn)報(bào)道,化合物8(沒(méi)食子酸乙酯)對(duì)枯草芽孢桿菌表現(xiàn)出較弱的抑菌活性,其MIC為1.00 mg·mL-1(Zhou et al.,2007),化合物15[(9Z,12Z)-N-(2-hydroxyethyl)octadeca-9,12-dienamide]具有較強(qiáng)的抗真菌活性(Yang et al.,2021)。
綜上所述,本研究系統(tǒng)闡釋了防風(fēng)地上部分的物質(zhì)基礎(chǔ),拓展和深化了對(duì)防風(fēng)地上部分所含化學(xué)成分的認(rèn)識(shí);化合物藥理活性研究為深入開(kāi)展防風(fēng)地上部分化合物抗炎活性的作用及機(jī)制研究提供了物質(zhì)基礎(chǔ),為進(jìn)一步探索和開(kāi)發(fā)防風(fēng)的藥用價(jià)值提供一定的科學(xué)參考。
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(責(zé)任編輯 周翠鳴)