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作者简介:

王欢(1998-),硕士研究生,主要从事天然药物化学研究,(E-mail)2586217644@qq.com。

通讯作者:

潘卫东,博士,研究员,主要从事天然药物化学研究,(E-mail)wdpan@163.com。

中图分类号:Q946

文献标识码:A

文章编号:1000-3142(2023)01-0139-09

DOI:10.11931/guihaia.gxzw202112044

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目录contents

    摘要

    为深入探究血人参中的活性物质成分,该文采用硅胶柱色谱、Sephadex LH-20柱色谱、半制备高效液相色谱以及重结晶等方法对血人参石油醚部位进行了系统分离纯化,并利用现代波谱技术对分离得到的单体化合物进行结构鉴定。结果表明:从血人参石油醚部位共分离得到22个单体化合物,分别鉴定为β-谷甾酮(1)、豆甾烷3,6-二酮(2)、6β-羟基-豆甾-4-烯-3-酮(3)、(22E)-5α,8α-epidioxyergosta-6, 22-dien-3β-ol(4)、美迪紫檀素(5)、sativan(6)、2′,4′-二羟基查尔酮(7)、6,7-dimethoxy-4-hydroxy-1-naphthoic acid(8)、对羟基苯甲酸乙酯(9)、2,4-二羟基苯甲酸乙酯(10)、(9E,11E)-13-oxo-9,11-ocatadecadienoic acid(11)、(9E,11E)-13-oxo-9,11-octadecadienoic acid methyl ester(12)、9-oxo-10E,12E-octadecadienoic acid methyl ester(13)、9-hydroxy-10E,12Z-octadecadienoic acid methyl ester(14)、pinellic acid(15)、9-oxo-10E,12E-octadecadienoic acid-(2S)-2,3-dihydroxypropyl ester(16)、β-谷甾醇(17)、白桦脂酸(18)、3β-hydroxyolean-12-en-11-one(19)、高丽槐素(20)、珊瑚菜素(21)、棕榈酸(b)。其中,化合物1-3711-16均为首次从豆科植物中分离得到,化合物1-16均为首次从木蓝属植物中分离得到,化合物1-16181921均为首次从血人参中分离得到。该研究结果进一步丰富了木蓝属植物血人参的化学结构类型,为该药材的进一步开发利用奠定了科学基础。

    Abstract

    With the aim to investigate the active chemical constituents for the roots of Indigofera stachyodes, the petroleum ether part of this plant was separated and purified using silica gel column chromatography, Sephadex LH-20 column chromatography, semi-preparative high performance liquid chromatography, and recrystallization methods. The structures of obtained monomeric compounds were identified through modern spectral techniques by detail analysis of their electrospray ionization mass spectrometry, hydrogen and carbon nuclear magnetic resonance spectra data, as well as compared with the reported references. The results were as follows: twenty-two natural compounds were identified as β-sitostenone (1), stigmasta-3,6-di-one (2), 6β-hydroxystigmast-4-en-3-one (3), (22E)-5α,8α-epidioxyergosta-6,22-dien-3β-ol (4), medicarpin (5), sativan (6), 2′,4′-dihydroxychaicone (7), 6,7-dimethoxy-4-hydroxy-1-naphthoic acid (8), p-hydroxybenzoic acid ethyl ester (9), 2,4-dihydroxybenzoic acid ethyl ester (10), (9E,11E)-13-oxo-9,11-ocatadecadienoic acid (11), (9E,11E)-13-oxo-9,11-octadecadienoic acid methyl ester (12), 9-oxo-10E,12E-octadecadienoic acid methyl ester (13), 9-hydroxy-10E,12Z-octadecadienoic acid methyl ester (14), pinellic acid (15) and 9-oxo-10E,12E-octadecadienoic acid-(2S)-2,3-dihydroxypropyl ester (16), β-sitosterol (17), betulinic acid (18), 3β-hydroxyolean-12-en-11-one (19), maackiain (20), phellopterin (21), palmitic acid (22). Of these compounds, ten compounds (compounds 1-3, 7, 11-16) were isolated from the Fabaceae for the first time; sixteen compounds (compounds 1-16) were obtained from Indigofera plant for the first time; at the same time, compounds 1-16, 18, 19, 21 were obtained from the roots of Indigofera stachyodes for the first time. Thus, the results of this research enrich the chemical structure types of roots of I. stachyodes, and afford a scientific foundation for its further rational use.

  • 血人参是豆科(Fabaceae)木蓝属(Indigofera L.)植物茸毛木蓝(Indigoferastachyodes)的干燥根,在我国主要分布于贵州、云南和广西等地。据《黔本草》记载,血人参是贵州特色苗族药材之一,其性温、味甘、微苦,具有益气补血、补肝益肾、活血通脉的功效,也是中成药芪胶升白胶囊配方中的重要成分(许欢等,2021)。血人参中化学成分的研究一直以来被关注较少,近十年来,陆续有研究者对其化学成分进行了相关报道,但主要集中在其乙酸乙酯部分,目前已报道的化学结构类型主要包括黄酮类、紫檀烷类、木质素类(傅建等,2013; 裘璐等,2013; 雷钟,2019; 张云封等,2021)等,而对其石油醚部位系统化学成分的研究报道仍然较少。

  • 为丰富血人参的化学成分结构类型并探索其活性物质基础,本研究对其石油醚部分开展了系统分离纯化工作,从中获得了22个单体化合物,其中,化合物1-3711-16均为首次从豆科植物中分离得到,化合物1-16均为首次从木蓝属植物中分离得到,化合物1-16181921均为首次从血人参中分离得到。

  • 1 材料与方法

  • 1.1 材料、仪器和试剂

  • 1.1.1 材料

  • 样品采自贵州省黔南州独山县,经贵阳市药用植物园侯小琪副教授鉴定为茸毛木蓝(I. stachyodes)的根部,药材标本保存于贵州省中国科学院天然产物化学重点实验室(凭证标本号:XRS20200704)。

  • 1.1.2 仪器

  • Bruker AV NEO-600 MHz核磁共振波谱仪(布鲁克公司); HP-5973质谱仪(美国惠普公司); 梅特勒ME104T电子天平(上海辅泽商贸有限公司); ZF-1三用紫外分析仪(上海力辰邦西仪器科技有限公司); RE 201D型旋转蒸发仪(青岛明博环保科技有限公司); YQ-020A超声波清洗器(上海易净超声波仪器有限公司); DLSB-5L/20低温冷却液循环泵(上海互佳仪器设备有限公司); NP7005C半制备液相色谱仪(江苏汉邦科技有限公司); ZORBAX ODS半制备色谱柱(安捷伦科技有限公司); Sephadex LH-20 凝胶(瑞典Amersham公司); GF254薄层层析硅胶、柱层析硅胶(青岛海洋化工有限公司); RP-18反相填充材料(德国默克公司)。

  • 图1 化合物1-16的结构

  • Fig.1 Chemical structures of compounds 1-16

  • 1.1.3 试剂

  • 提取分离所用到的溶剂包括乙醇、甲醇、氯仿、乙酸乙酯、丙酮、石油醚等均为分析纯,半制备高效液相色谱仪所用甲醇、乙腈为色谱纯,均购自萨恩化学技术(上海)有限公司。氘代氯仿和甲醇试剂均购自萨恩化学技术(上海)有限公司。

  • 1.2 方法

  • 1.2.1 提取与萃取

  • 将干燥血人参样品(30 kg)粉碎成粗粉,用95%乙醇进行加热回流提取3次(3、3、2 h),减压浓缩得到浸膏(4.7 kg),浸膏用水分散依次用石油醚、乙酸乙酯进行萃取,分别得到石油醚部位(508 g)、乙酸乙酯部位(2 413 g)和水部位(2 026.8 g)。

  • 1.2.2 石油醚部位分离纯化

  • 取石油醚部位(458 g)经硅胶拌样后,进行柱色谱梯度洗脱(石油醚∶乙酸乙酯=100∶0~0∶100),分离得到5个组分(Fr.A~Fr.E)。Fr.B(68.5 g)经过硅胶柱色谱(石油醚∶丙酮=100∶1~0∶100)分离后得到8个组分Fr.B1~Fr.B8。Fr.B4通过凝胶和半制备高效液相色谱仪纯化后得到化合物1(12.1 mg)、2(7.4 mg)、3(15.2 mg)、19(8.3 mg),Fr.B5通过反相柱层析、凝胶柱层析以及半制备高效液相色谱仪纯化后分别得到化合物4(6.3 mg)、5(19.4 mg)、20(8.5 mg)、21(5.2 mg)。Fr.C(47.8 g)经硅胶柱层析洗脱(石油醚∶丙酮=50∶1~0∶50)后,得到6个组分Fr.C1~Fr.C6。Fr.C3重结晶后得到化合物17(200 mg),Fr.C4经MCI脱除色素,进一步经反复硅胶柱层析和凝胶柱层析纯化后得到化合物18(5.8 mg)、22(200 mg)。Fr.D(72.9 g)经反相硅胶柱层析洗脱后得到7个组分Fr.D1~Fr.D7,Fr.D2(3.8 g)经凝胶柱层析和半制备高效液相色谱仪纯化后得到化合物6(8.1 mg)、7(6.9 mg)。Fr.D3(11.7 g)经反相柱层析和半制备高效液相色谱仪纯化后得到化合物8(11.3 mg)、9(9.5 mg)、10(9.8 mg)。Fr.D4(14.2 g)经硅胶柱层析、凝胶柱层析以及半制备高效液相色谱仪纯化后得到化合物11(18.3 mg)、12(19.8 mg)、14(24.2 mg)。Fr.D5(15.6 g)经凝胶柱层析以及半制备高效液相色谱仪纯化后得到化合物13(21.2 mg)、15(14.8 mg)、16(17.1 mg)。化合物1-16的结构式如图1所示。

  • 2 化合物的结构鉴定

  • 化合物1 白色粉末,分子式C29H48O,ESI-MS m/z: 435.1 [M+Na]+1H-NMR(600 MHz,CDCl3δH(ppm):5.74(1H,s,H-4),1.20(3H,s,19-Me),0.93(3H,d,J = 6.6 Hz,21-Me),0.87(3H,d,J = 7.2 Hz,29-Me),0.82(3H,d,J = 7.2 Hz,26-Me),0.83(3H,d,J = 7.2 Hz,27-Me),0.73(3H,s,Me-18)。13C-NMR(150 MHz,CDCl3δC(ppm): 35.7(C-1),33.8(C-2),199.7(C-3),123.7(C-4),171.7(C-5),32.9(C-6),32.1(C-7),35.6(C-8),53.8(C-9),38.6(C-10),21.0(C-11),39.6(C-12),42.4(C-13),56.0(C-14),24.2(C-15),29.1(C-16),55.9(C-17),11.9(C-18),17.4(C-19),36.1(C-20),18.7(C-21),33.9(C-22),28.2(C-23),36.1(C-24),29.7(C-25),19.8(C-26),19.0(C-27),23.1(C-28),11.9(C-29)。以上数据与文献(Li et al.,2008)报道基本一致,故鉴定化合物1β-谷甾酮。

  • 化合物2 白色粉末,分子式C29H48O2,ESI-MS m/z: 451.6 [M+Na]+1H-NMR(600 MHz,CDCl3δH(ppm): 0.98(3H,s,Me-18),0.97(3H,s,Me-19),0.95(3H,d,J = 6.6 Hz,Me-27),0.94(3H,s,Me-21),0.82(3H,t,J = 3.6 Hz,Me-29),0.72(3H,d,J = 10.8 Hz,Me-26)。13C-NMR(150 MHz,CDCl3δC(ppm): 38.1(C-1),39.4(C-2),209.2(C-3),37.0(C-4),57.5(C-5),211.4(C-6),46.6(C-7),37.4(C-8),53.5(C-9),41.3(C-10),21.7(C-11),38.1(C-12),43.0(C-13),56.0(C-14),24.0(C-15),28.1(C-16),56.6(C-17),12.6(C-18),11.9(C-19),36.1(C-20),18.7(C-21),33.8(C-22),26.0(C-23),45.8(C-24),29.1(C-25),19.8(C-26),19.0(C-27),23.0(C-28),12.0(C-29)。以上数据与文献(徐静等,2009)报道基本一致,故鉴定化合物2为豆甾烷3,6-二酮。

  • 化合物3 白色粉末,分子式C29H46O2,ESI-MS m/z: 449.2 [M+Na]+1H-NMR(600 MHz,CDCl3δH(ppm):5.83(1H,s,H-4),4.36(1H,brs,H-6),2.53(1H,m,H-2a),2.39(1H,m,H-2b),2.06(1H,m,H-1a),2.04(1H,m,H-12a),1.98(1H,m,H-8),1.87(1H,m,H-1b),1.70(2H,m,H-28),1.53(2H,m,H-11),1.39(3H,s,19-Me),1.30(1H,m,H-25),1.25(1H,m,H-7),1.16(1H,m,H-12b),1.15(1H,m,H-23),1.13(1H,m,H-17),1.04(1H,m,H-14),0.94(2H,d, J = 6.6 Hz,H-21),0.91(1H,m,H-9),0.86(3H,d,J = 6.6 Hz,26-Me),0.83(3H,d, J = 6.6 Hz,27-Me),0.82(3H,t,J = 6.6 Hz,29-Me),0.76(3H,s,18-me)。13C-NMR(150 MHz,CDCl3δC(ppm): 37.1(C-1),34.3(C-2),200.5(C-3),126.3(C-4),168.6(C-5),73.2(C-6),38.5(C-7),29.7(C-8),53.6(C-9),38.0(C-10),20.9(C-11),39.6(C-12),42.5(C-13),55.8(C-14),24.1(C-15),28.2(C-16),56.1(C-17),12.0(C-18),19.5(C-19),36.1(C-20),18.7(C-21),33.9(C-22),26.0(C-23),45.8(C-24),29.1(C-25),19.8(C-26),19.0(C-27),23.0(C-28),11.9(C-29)。以上数据与文献(何志恒等,2006)报道一致,故鉴定化合物3为6β-羟基-豆甾-4-烯-3-酮。

  • 化合物4 无色针晶(甲醇),熔点177~179℃,分子式C28H44O3,ESI-MS m/z: 451.3 [M+Na]+1H-NMR(600 MHz,CDCl3δH(ppm): 6.53(1H,d,J = 8.4 Hz,H-7),6.27(1H,d,J = 8.4 Hz,H-6),5.25(1H,dd,J = 7.8,15.0 Hz,H-23),5.17(1H,dd,J = 8.4,15.0 Hz,H-22),3.95~4.05(1H,m,H-3),1.02(3H,d,J = 6.6 Hz,Me-21),0.93(3H,d,J = 6.6 Hz,Me-28),0.86(3H,s,Me-19),0.85(3H,d,J = 3.0 Hz,Me-27),0.84(3H,s,Me-18),0.83(3H,d,J = 2.4 Hz,Me-26)。13C-NMR(150 MHz,CDCl3δC(ppm): 34.6(C-1),30.1(C-2),66.4(C-3),36.9(C-4),82.1(C-5),135.4(C-6),130.7(C-7),79.4(C-8),51.1(C-9),36.9(C-10),23.4(C-11),39.3(C-12),44.5(C-13),51.6(C-14),20.6(C-15),28.6(C-16),56.2(C-17),12.9(C-18),18.1(C-19),39.7(C-20),20.8(C-21),135.2(C-22),132.3(C-23),42.8(C-24),33.1(C-25),19.6(C-26),19.9(C-27),17.5(C-28)。以上数据与文献(Hybelbauerová et al.,2008)报道一致,故鉴定化合物4为(22E)-5α,8α-epidioxyergosta-6,22-dien-3β-ol。

  • 化合物5 黄色油状,分子式C16H14O4,ESI-MS m/z: 307.1 [M+Na]+1H-NMR(600 MHz,CDCl3δH(ppm): 7.40(1H,d,J = 8.4 Hz,H-1),7.16(1H,d,J = 9.0 Hz,H-7),6.58(1H,dd, J = 2.4,14.4 Hz,H-8),6.48(1H,dd, J = 2.4,8.4 Hz,H-2),6.47(1H,d,J = 2.8 Hz,H-4),6.44(1H,d,J = 2.4 Hz,H-10),5.51(1H,d,J = 7.2 Hz,H-11a),4.26(1H,dd,J = 4.8,10.8 Hz,H-6α),3.63(1H,dd, J = 10.8,22.2 Hz,H-6β),3.56(1H,m,H-6a)。13C-NMR(150 MHz,CDCl3δC(ppm): 132.2(C-1),109.8(C-2),157.2(C-3),103.7(C-4),156.7(C-4a),66.6(C-6),39.5(C-6a),119.1(C-6b),124.8(C-7),96.9(C-8),161.1(C-9),196.4(C-10),160.7(C-10a),78.6(C-11a),112.5(C-11b),55.5(9-OMe)。以上数据与文献(Kitagawa et al.,1994)报道一致,故鉴定化合物5为美迪紫檀素。

  • 化合物6 无色油状,分子式C17H18O4,ESI-MS m/z: 309.4 [M+Na]+1H-NMR(600 MHz,CDCl3δH(ppm): 7.04(1H,d,J = 8.4 Hz,H-6′),6.95(1H,d,J = 8.4 Hz,H-5),6.51(1H,d,J = 2.4 Hz,H-3′),6.47(1H,dd,J = 2.4,8.4 Hz,H-5′),6.40(1H,dd,J = 2.4,8.4 Hz,H-6),6.38(1H,d,J = 2.4 Hz,H-8),4.31(1H,d,J = 10.2 Hz,H-2a),4.02(1H,t,J = 10.2 Hz,H-2b),3.83(3H,s,-OMe),3.82(3H,s,-OMe),3.58(1H,m,H-3),2.99(1H,dd,J = 10.8,15.6 Hz,H-4a),2.87(1H,dd,J = 3.6,15.6 Hz,H-4b)。13C-NMR(150 MHz,CDCl3δC(ppm): 31.0(C-2),31.6(C-3),70.1(C-4),130.4(C-5),107.8(C-6),155.2(C-7),103.2(C-8),154.9(C-9),114.9(C-10),121.9(C-1′),158.3(C-2′),98.7(C-3′),159.7(C-4′),104.1(C-5′),127.5(C-6′),55.4(-OMe),55.4(-OMe)。以上数据与文献(Yoon et al.,2004)报道一致,故鉴定化合物6为sativan。

  • 化合物7 无色油状,分子式C16H32O2,ESI-MS m/z: 263.7 [M+Na]+1H-NMR(600 MHz,CDCl3δH(ppm): 7.89(3H,m,H-3,H-4,H-5),7.67(2H,d, J = 8.4 Hz,H-2,H-6),7.45(2H,br s,H-7,H-8)。13C-NMR(150 MHz,CDCl3δC(ppm): 134.8(C-1),128.6(C-2,C-6),129.1(C-3,C-5),132.0(C-4),191.6(-C=O),120.4(C-7),144.7(C-8),107.9(C-1′),162.8(C-2′),114.1(C-3′),166.1(C-4′),130.7(C-5′),103.8(C-6′)。以上数据与文献(Mezrag et al.,2013)报道一致,故鉴定化合物7为2′,4′-二羟基查尔酮。

  • 化合物8 无色针晶(甲醇),熔点141~143℃,分子式C13H12O5,ESI-MS m/z: 249.3 [M+H]+1H-NMR(600 MHz,CDCl3δH(ppm):7.44(1H,d,J = 8.4 Hz,H-2),7.43(1H,s,H-5),7.20(1H,s,H-8),6.85(1H,d,J = 8.4 Hz,H-3),3.80(3H,s,-OMe),3.79(3H,s,-OMe)。13C-NMR(150 MHz,CDCl3δC(ppm): 140.6(C-1),123.9(C-2),115.5(C-3),151.5(C-4),121.1(C-4a),107.3(C-5),147.8(C-6),147.3(C-7),113.1(C-8),120.9(C-8a),56.4(-OMe),55.9(-OMe)167.7(-COOH)。以上数据与文献(Zhang et al.,2009)一致,故鉴定化合物8为6,7-dimethoxy-4-hydroxy-1-naphthoic acid。

  • 化合物9 淡黄色油状,分子式C9H10O3,ESI-MS m/z: 189.1 [M+Na]+1H-NMR(600 MHz,DMSO)δH(ppm):10.34(1H,s,4-OH),7.81(2H,d, J = 8.4 Hz,H-2,H-6),6.84(2H,d,J = 8.4 Hz,H-3,H-5),4.25(2H,q,J = 7.2 Hz,H-7),1.28(3H,t, J = 7.2 Hz,8-Me)。13C-NMR(150 MHz,DMSO)δC(ppm): 121.0(C-1),131.8(C-2,C-6),115.8(C-3,C-5),162.4(C-4),60.5(C-7),14.7(C-8),166.0(-COO-)。以上数据与文献(张婷婷等,2015)一致,故鉴定化合物9为对羟基苯甲酸乙酯。

  • 化合物10 淡黄色油状,分子式C9H10O4,ESI-MS m/z: 181.2 [M-H]-1H-NMR(600 MHz,DMSO)δH(ppm): 10.79(1H,s,4-OH),10.51(1H,s,2-OH),7.65(1H,d,J = 8.4 Hz,H-6),6.38(1H,dd,J = 2.4,8.4 Hz,H-5),6.30(1H,d,J = 2.4 Hz,H-3),4.30(2H,q,J = 7.2 Hz,H-7),1.31(3H,t,J = 7.2 Hz,8-Me)。13C-NMR(150 MHz,DMSO)δC (ppm): 104.5(C-1),164.7(C-2),102.9(C-3),163.3(C-4),108.8(C-5),132.0(C-6),61.3(C-7),14.6(C-8),169.7(-COO-)。以上数据与文献(Fan et al.,2020)一致,故鉴定化合物10为2,4-二羟基苯甲酸乙酯。

  • 化合物11 无色油状,分子式C18H30O3,ESI-MS m/z: 293.3 [M-H]-1H-NMR(600 MHz,CDCl3δH(ppm): 7.51(dd,J = 11.4,15.0 Hz,H-11),6.19(d,J = 15.0 Hz,H-12),6.14(t,J = 10.8 Hz,H-10),5.93(q,J = 7.8 Hz,H-9),2.57(t,J = 7.2 Hz,H-14),2.37(t,J = 7.2 Hz,H-2),2.32(q,J = 7.8 Hz,H-8),1.65(m,H-17),1.31~1.36(m,H-3-H-7,H-15,H-16),0.92(t,J = 7.2 Hz,H-18)。13C-NMR(150 MHz,CDCl3δC(ppm): 178.5(C-1,C),33.8(C-2,CH2),24.6(C-3,CH2),28.4(C-4,CH2),29.1(C-5,CH2),28.9(C-6,CH2),29.2(C-7,CH2),29.1(C-8,CH2),142.7(C-9,CH),126.9(C-10,CH),137.1(C-11,CH),129.3(C-12,CH),201.1(C-13,C),41.0(C-14,CH2),24.3(C-15,CH2),31.4(C-16,CH2),22.5(C-17,CH2),14.0(C-18,CH3)。以上数据与文献(陈亚萍等,2014)报道一致,故鉴定化合物11为(9E,11E)-13-oxo-9,11-ocatadecadienoic acid。

  • 化合物12 无色油状,分子式C19H32O3,ESI-MS m/z: 307.3 [M-H]-1H-NMR(600 MHz,CDCl3δH(ppm):7.50(1H,dd,J = 12.0,15.0 Hz,H-11),6.18(1H,d,J = 15.0 Hz,H-12),6.11(1H,t,J = 10.8 Hz,H-10),5.91(1H,q,J = 7.8 Hz,H-9),3.68(3H,s,-OMe),2.55(2H,t,J = 7.2 Hz,H-14),2.31~2.33(4H,m,H-2,H-8),1.63(2H,m,H-17),1.30~1.45(14H,m,H-3-H-7,H-15,H-16),0.91(3H,t, J = 7.2 Hz,H-18)。13C-NMR(150 MHz,CDCl3δC(ppm): 174.3(C-1),34.1(C-2),24.9(C-3),28.3(C-4),29.1(C-5),29.0(C-6),29.1(C-7),29.0(C-8),142.7(C-9),126.9(C-10),137.1(C-11),129.4(C-12),201.0(C-13),41.0(C-14),24.3(C-15),31.4(C-16),22.5(C-17),14.0(C-18),51.5(-OMe)。以上数据与文献(Jiang &Gerwick,1991)报道一致,故鉴定化合物12为(9E,11E)-13-oxo-9,11-octadecadienoic acid methyl ester。

  • 化合物13 无色油状,分子式C19H32O3,ESI-MS m/z: 307.1 [M-H]-1H-NMR(600 MHz,CDCl3δH(ppm):7.15(1H,m,H-11),6.19(2H,m,H-12,H-13),6.08(1H,d,J = 15.6 Hz,H-10),3.68(3H,s,-OMe),2.55(2H,t, J = 7.2 Hz,H-8),2.31(2H,t,J = 7.2 Hz,H-2),2.19(2H,m,H-14),1.63(4H,m,H-3,H-7),1.45(2H,m,H-15),1.30~1.38(10H,m,H-4,H-5,H-6,H-15,H-16),0.91(3H,t,J = 7.2 Hz,H-18)。13C-NMR(150 MHz,CDCl3δC(ppm): 174.3(C-1),34.1(C-2),24.9(C-3),29.0(C-4),29.1(C-5),29.1(C-6),24.4(C-7),40.4(C-8),201.1(C-9),127.9(C-10),143.0(C-11),128.9(C-12),145.8(C-13),33.1(C-14),28.4(C-15),31.4(C-16),22.5(C-17),14.0(C-18),51.1(-OMe)。以上数据与文献(Wu et al.,2011)报道一致,故鉴定化合物13为9-oxo-10E,12E-octadecadienoic acid methyl ester。

  • 化合物14 白色无定形粉末,分子式C19H34O3,ESI-MS m/z: 309.2 [M-H]-1H-NMR(600 MHz,CDCl3δH(ppm):6.49(1H,dd,J = 14.4,11.4 Hz,H-11),5.98(1H,t,J = 10.8 Hz,H-12),5.68(1H,dd,J = 12.6,6.0 Hz,H-10),5.45(1H,m,H-13),4.16(1H,dd,J = 11.4,6.0 Hz,H-9),3.67(3H,s,-OMe),2.31(2H,t,J = 7.8 Hz,H-2),2.18(2H,dd,J = 7.8,15.0 Hz,H-14),1.29~1.64(18H,m,9×-CH2),0.90(3H,t,J = 7.2 Hz,H-18)。13C-NMR(150 MHz,CDCl3δC(ppm): 174.3(C-1),34.1(C-2),25.3(C-3),29.1(C-4),29.1(C-5),29.3(C-6),24.9(C-7),37.3(C-8),72.9(C-9),135.8(C-10),125.9(C-11),127.7(C-12),133.0(C-13),27.7(C-14),29.3(C-15),31.5(C-16),22.5(C-17),14.1(C-18),51.5(-OMe)。以上数据与文献(李江玲等,2014)报道一致,故鉴定化合物14为9-hydroxy-10E,12Z-octadecadienoic acid methyl ester。

  • 化合物15 无色油状,分子式C18H34O5,ESI-MS m/z: 329.5 [M-H]-1H-NMR(600 MHz,CDCl3δH(ppm):5.71(1H,dd,J = 15.6,5.4 Hz,H-10),5.69(2H,dd, J = 15.6,6.6 Hz,H-11),4.07(1H,m,H-9),3.98(1H,m,H-12),3.37(1H,m,H-13),2.29(2H,t,J = 7.2 Hz,H-2),1.60(2H,t,J = 7.2 Hz,H-3),1.31~1.52(18H,m,9×-CH2),0.88(3H,t,J = 7.2 Hz,H-18)。13C-NMR(150 MHz,CDCl3δC (ppm): 176.7(C-1),34.0(C-2),24.8(C-3),28.9(C-4),29.0(C-5),29.3(C-6),25.1(C-7),36.9(C-8),71.7(C-9),128.4(C-10),136.1(C-11),75.2(C-12),74.3(C-13),32.1(C-14),25.6(C-15),31.8(C-16),22.5(C-17),13.9(C-18)。以上数据与文献(Choi et al.,2013)报道一致,故鉴定化合物15为pinellic acid。

  • 化合物16 无色油状,分子式C21H36O5,ESI-MS m/z: 367.4 [M-H]-1H-NMR(600 MHz,CDCl3δH (ppm):7.16(1H,m,H-11),6.20(2H,m,H-12,H-13),6.08(1H,d,J = 15.6 Hz,H-10),4.23(1H,dd,J = 11.4,4.2 Hz,H-1′a),4.16(1H,dd,J = 11.4,6.0 Hz,H-1′b),3.95(1H,m,H-2′),3.72(1H,dd,J = 11.4,3.6 Hz,H-3′a),3.62(1H,dd,J = 10.8,6.0 Hz,H-3′b),2.55(2H,t,J = 7.2 Hz,H-8),2.38(2H,t,J = 7.2 Hz,H-2),2.20(2H,m,H-14),1.64(4H,m,H-3,H-7),1.45(2H,m,H-15),1.27~1.34(10H,m,H-4,H-5,H-6,H-15,H-16),0.91(3H,t,J = 7.2 Hz,18-Me)。13C-NMR(150 MHz,CDCl3δC(ppm): 174.2(C-1),34.1(C-2),24.8(C-3),28.8(C-4),28.9(C-5),29.0(C-6),24.2(C-7),40.4(C-8),201.3(C-9),127.8(C-10),143.2(C-11),128.8(C-12),146.0(C-13),33.1(C-14),28.4(C-15),31.4(C-16),22.5(C-17),14.0(C-18),65.2(C-1′),70.3(C-2′),63.4(C-3′)。以上数据与文献(Kawagishi et al.,2002)报道一致,故鉴定化合物16为9-oxo-10E,12E-octadecadienoic acid-(2S)-2,3-dihydroxypropyl ester。

  • 化合物17 无色块状晶体,熔点140~142℃,分子式C29H50O,ESI-MS m/z: 437.3 [M+Na]+1H-NMR(600 MHz,CDCl3δH(ppm): 5.35(1H,m,H-6),3.53(1H,m,H-3),2.31(1H,dd,J = 12.0,3.0 Hz,H-7a),2.27(1H,dd,J = 12.0,3.0 Hz,H-7b),1.01(3H,s,Me-18),1.02(3H,s,Me-19),0.91(3H,s,Me-21),0.88(3H,d,J = 7.2 Hz,Me-27),0.82(3H,t,J = 3.6 Hz,Me-29),0.70(3H,d,J = 7.2 Hz,Me-26)。13C-NMR(150 MHz,CDCl3δC(ppm): 36.1(C-1),29.0(C-2),71.9(C-3),45.7(C-4),140.8(C-5),121.5(C-6),31.4(C-7),31.6(C-8),50.2(C-9),36.2(C-10),26.3(C-11),39.7(C-12),42.2(C-13),56.7(C-14),24.2(C-15),28.2(C-16),56.2(C-17),11.8(C-18),19.3(C-19),19.1(C-20),31.8(C-21),34.0(C-22),23.0(C-23),37.2(C-24),18.7(C-25),12.0(C-26),21.2(C-27),19.7(C-28),12.2(C-29)。以上数据与文献(刘健等,2018)报道基本一致,故鉴定化合物17β-谷甾醇。

  • 化合物18 白色粉末,分子式C30H48O3,ESI-MS m/z: 479.1 [M+Na]+1H-NMR(600 MHz,CDCl3δH(ppm): 4.76(1H,br s,H-29b),4.63(1H,br s,H-29a),3.21(1H,dd,J = 4.8,11.4 Hz,H-3),0.99(3H,s,Me-27),0.98(3H,s,Me-23),0.96(3H,s,Me-26),0.85(3H,s,Me-25),0.78(3H,s,Me-24)。13C-NMR(150 MHz,CDCl3δC(ppm): 38.7(C-1),27.4(C-2),79.0(C-3),38.9(C-4),55.4(C-5),18.3(C-6),34.3(C-7),40.7(C-8),50.5(C-9),37.2(C-10),20.9(C-11),25.5(C-12),38.4(C-13),42.5(C-14),30.6(C-15),32.2(C-16),56.3(C-17),49.3(C-18),46.9(C-19),150.0(C-20),29.7(C-21),37.0(C-22),28.0(C-23),15.4(C-24),16.1(C-25),16.0(C-26),14.7(C-27),179.3(C-28),109.7(C-29),19.4(C-30)。以上数据与文献(Yili et al.,2009)报道一致,故鉴定化合物18为白桦脂酸。

  • 化合物19 白色粉末,分子式C30H48O2,ESI-MS m/z: 463.0 [M+Na]+1H-NMR(600 MHz,CDCl3δH(ppm): 5.60(1H,s,H-12),3.25(1H,dd, J = 10.8,4.8 Hz,H-3),2.81(1H,m,H-2a),2.36(1H,s,H-9),2.35(1H,m,H-2b),2.16(1H,m,H-18),1.38(3H,s),1.16(3H,s),1.15(3H,s),1.03(3H,s),0.92(3H,s),0.91(3H,s),0.88(3H,s),0.83(3H,s)。13C-NMR(150 MHz,CDCl3δC(ppm): 39.1(C-1),23.5(C-2),78.8(C-3),37.9(C-4),54.9(C-5),17.5(C-6),32.8(C-7),45.4(C-8),61.8(C-9),37.1(C-10),200.1(C-11),128.1(C-12),179.5(C-13),43.4(C-14),26.4(C-15),26.5(C-16),32.3(C-17),47.6(C-18),45.2(C-19),31.0(C-20),34.4(C-21),36.5(C-22),28.1(C-23),16.3(C-24),15.5(C-25),18.7(C-26),23.4(C-27),28.8(C-28),33.0(C-29),23.4(C-30)。以上数据与文献(Herath et al.,2001)报道一致,故鉴定化合物19为3β-hydroxyolean-12-en-11-one。

  • 化合物20 黄色油状,分子式C16H12O5,ESI-MS m/z: 293.1 [M+Na]+1H-NMR(600 MHz,CDCl3δH(ppm): 7.38(1H,d,J = 8.4 Hz,H-1),6.74(1H,s,H-7),6.58(1H,dd,J = 2.4,8.4 Hz,H-2),6.45(1H,s,H-10),6.44(1H,d,J = 2.8 Hz,H-4),5.94(1H,d,J = 1.2 Hz,H-12a),5.91(1H,d,J = 1.2 Hz,H-12b),5.49(1H,d,J = 6.6 Hz,H-11a),4.24(1H,dd,J = 5.4,11.4 Hz,H-6α),3.66(1H,dd,J = 10.8,22.2 Hz,H-6β),3.50(1H,m,H-6a)。13C-NMR(150 MHz,CDCl3δC(ppm): 132.1(C-1),109.8(C-2),157.2(C-3),104.8(C-4),156.6(C-4a),66.5(C-6),40.1(C-6a),117.9(C-6b),103.7(C-7),154.2(C-8),148.1(C-9),141.7(C-10),160.7(C-10a),78.5(C-11a),112.5(C-11b),103.7(C-12)。以上数据与文献(Lin &Kuo,1993)报道一致,故鉴定化合物20为高丽槐素。

  • 化合物21 黄色粉末,分子式C17H16O5,ESI-MS m/z: 299.2 [M-H]-1H-NMR(600 MHz,CDCl3δH(ppm):8.14(1H,d,J = 9.6 Hz,H-4),7.63(1H,d,J = 2.4 Hz,H-2′),7.01(1H,J = 2.4 Hz,H-3′),6.29(1H,d,J = 9.6 Hz,H-3),5.60(1H,t, J = 7.8 Hz,H-2″),4.85(2H,d,J = 7.2 Hz,H-1″),4.19(3H,s,5-OMe),1.78(3H,s,3″a-Me),1.72(3H,s,3″b-Me)。13C-NMR(150 MHz,CDCl3δC(ppm): 160.6(C-2),112.7(C-3),139.6(C-4),144.3(C-5,C-9),60.8(5-OMe),114.5(C-6),150.8(C-7),126.7(C-8),107.5(C-10),145.1(C-2′),105.1(C-3′),70.4(C-1″),119.8(C-2″),139.7(C-3″),25.8(3″a-Me),18.0(3″b-CH3)。以上数据与文献(邓改改等,2015)一致,故鉴定化合物21为珊瑚菜素。

  • 化合物22 无色油状,分子式C16H32O2,ESI-MS m/z: 255.5 [M-H]-1H-NMR(600 MHz,CDCl3δH(ppm): 2.30(2H,t,J = 7.2 Hz,H-2),1.63(2H,m,H-3),1.26-1.30(24H,m,H-4-15),0.86(t,J = 6.6 Hz,Me-16)。13C-NMR(150 MHz,DMSO)δC(ppm): 178.3(C-1),34.0(C-2),31.8(C-3),29.8(C-4),29.7(C-5),29.7(C-6),29.5(C-7),29.5(C-8),29.5(C-9),29.4(C-10),29.4(C-11),29.3(C-12),29.2(C-13),25.0(C-14),22.4(C-15),14.0(C-16)。以上数据与文献(许莉等,2018)报道一致,故鉴定化合物22为棕榈酸。

  • 3 讨论与结论

  • 木蓝属植物的特征性成分主要为黄酮类和硝基丙酰基类化合物。本研究从木蓝属植物血人参(茸毛木蓝的干燥根)的石油醚部位获得了22个单体化合物,主要的结构为5个甾体化合物和7个长链脂肪酸类化合物,而长链脂肪酸主要为十八烷酸及其衍生物在其C-9~C-13位发生不同程度氧化所产生,这是首次从木蓝属植物中报道此类化合物的存在,且含量均相对较大,故可将此类化合物当作木蓝属植物的特征性成分。此外,有文献报道,不管是甾体类化合物,还是碳十八烷酸及其衍生物,通常具有较好的抗炎活性(张俊卿等,2021),结合血人参在贵州民间的解热镇痛用途,初步推测可能与其中含有的此类化合物有必然的关系,下一步的研究中将进行相应的活性验证,希望在明确其特征成分的同时,阐明其具体的活性物质基础,为中药民族药走向现代化提供一定的科学依据。

  • 本文通过对木蓝属植物茸毛木蓝根的化学成分进行研究,特别是对前人研究较少的石油醚部分进行系统分离纯化,进一步完善了该植物的化学结构多样性,为茸毛木蓝的深入开发利用提供了一定的科学基础。

  • 致谢感谢贵州省中国科学院天然产物化学重点实验室分析测试研究中心胡恩明老师对本论文中所有化合物质谱的检测,以及姜阳明老师对本论文中所有化合物核磁谱图的测定。

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