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中国精品科技期刊2020

杜仲叶的活性成分、药理作用及其在食品加工中的应用

龚频, 韩业雯, 翟鹏涛, 陈雪峰, 翟文俊, 郑本忠, 陈福欣

龚频,韩业雯,翟鹏涛,等. 杜仲叶的活性成分、药理作用及其在食品加工中的应用[J]. 食品工业科技,2022,43(10):395−404. doi: 10.13386/j.issn1002-0306.2021050082.
引用本文: 龚频,韩业雯,翟鹏涛,等. 杜仲叶的活性成分、药理作用及其在食品加工中的应用[J]. 食品工业科技,2022,43(10):395−404. doi: 10.13386/j.issn1002-0306.2021050082.
GONG Pin, HAN Yewen, ZHAI Pengtao, et al. Active Components, Pharmacological Action and Application in Food Processing of Eucommia ulmoides Leaves[J]. Science and Technology of Food Industry, 2022, 43(10): 395−404. (in Chinese with English abstract). doi: 10.13386/j.issn1002-0306.2021050082.
Citation: GONG Pin, HAN Yewen, ZHAI Pengtao, et al. Active Components, Pharmacological Action and Application in Food Processing of Eucommia ulmoides Leaves[J]. Science and Technology of Food Industry, 2022, 43(10): 395−404. (in Chinese with English abstract). doi: 10.13386/j.issn1002-0306.2021050082.

杜仲叶的活性成分、药理作用及其在食品加工中的应用

基金项目: 陕西省科技厅重点产业创新链(群)-农业领域(2021ZDLNY04-01);陕西省科技厅一般项目-农业领域(2021NY-161);陕西省中医药管理局(2019-ZZ-ZY005);榆林市科技局科研项目(2019-185)。
详细信息
    作者简介:

    龚频(1983−),女,博士,副教授,研究方向:功能食品因子开发,E-mail:gongpin@sust.edu.cn

    通讯作者:

    陈雪峰(1964−),男,博士,教授,研究方向:食品科学,E-mail:chenxf@sust.edu.cn

  • 中图分类号: R282

Active Components, Pharmacological Action and Application in Food Processing of Eucommia ulmoides Leaves

  • 摘要: 杜仲富含大量活性成分,研究证明杜仲叶与杜仲皮有相同的药理作用,但未得到有效开发。本文整理已发表的杜仲叶相关文献,对其活性成分、药理作用及其在食品加工中的应用进行论述,以期为杜仲叶的精深加工和高值化开发奠定一定的理论基础。
    Abstract: Eucommia ulmoides is rich in a large number of active ingredients. Studies prove that the leaves and bark of Eucommia ulmoides have the same pharmacological effects, but it has not been effectively developed. In this paper, the active components, pharmacological effects and application in food processing of Eucommia ulmoides leaves are reviewed, so as to lay a theoretical foundation for deep processing and high-value development of Eucommia ulmoides leaves.
  • 杜仲(Eucommia ulmoides Oliver),别名胶木,思连皮,丝棉皮,玉丝皮,为杜仲科杜仲属植物。在温暖湿润且常年放晴的环境中生长茂盛,具有一定的抗寒能力,是中国的特有种,大多在陕西、甘肃、河南、湖北等省区种植。其中陕西省略阳县是我国最大的杜仲基地县,2017年地存杜仲约3.9万公顷,1.29亿株,占全国总量的13%。杜仲自古以来被用作补药,具有补肝肾、安胎、抗炎杀菌以及增强体格等作用[1]。查阅大量资料发现杜仲的开发主要集中在杜仲皮和杜仲胶。20世纪80~90年代初期,市场上掀起“杜仲热”,人们对杜仲认知度上升,需求量增大,杜仲皮价格呈现持续上涨的局势,又因杜仲皮具有生长周期较长的特点,资源紧缺,无法进行大规模开发利用[2-3]

    据《中国药典》中记录,杜仲的药用部分为杜仲皮和叶[4],有研究发现,杜仲叶和杜仲皮有相似的活性成分,但含量有一定区别,且被证明有互补的趋势,在消炎、杀菌、降压等药理方面叶可替代皮[5-6]。杜仲叶并未得到有效开发,2019年杜仲叶被国家卫健委列入按照传统“既是食品又是中药材”的物质生产经营试点工作名单。本文通过归纳杜仲叶的活性成分以及药理作用,分析其在食品加工中的应用,旨在促进杜仲资源的合理利用,为未来杜仲叶开发利用及精加工提供宝贵建议。

    对杜仲叶不同药理活性的研究中,研究其活性成分是连接传统中草药理论和现代化医学的纽带。杜仲叶的活性成分集中于木质素类、环烯醚萜类、类苯丙素、黄酮类化合物[7]等。此外,杜仲叶还具有多种营养要素,如氨基酸、矿物质、胡萝卜素、脂肪等[8-9]。据研究可知,杜仲中的化学成分与含量在不同的部位和生长年限并不完全相同[10],其相应的活性功能的强弱也不完全一致。

    木质素是4-羟基苯丙素氧化组合偶联而产生的一大群芳香族聚合物的总称,具有保护细胞壁多糖不受微生物降解,赋予其耐腐性等功能[11]。根据化学结构的不同可将木质素类化合物分为单环氧木质素类(Ⅰ)、环木质素类(Ⅱ)、双环氧木质素类(Ⅲ)、木质内酯类(Ⅳ)、新木质素类(Ⅴ)和倍木质素类(Ⅵ)(图1[3,12]。截至目前,已有32种木质素类化合物从杜仲的不同部位分离出[13],主要化学成分有杜仲素A、环橄榄脂素、松脂醇二葡萄糖苷、丁香脂素二葡萄糖苷等[14-17]。有研究发现化学结构为两个苯环对位的羟基的松脂醇丁香脂素二葡萄糖苷具有抗肿瘤、抗衰老、增强记忆力和较强的抑制环磷酸腺苷(cMAP)磷酸二酯酶的作用[18]。化雪艳[19]通过中性洗涤剂法测定杜仲叶中木质素含量为164.667 mg/g,约是杜仲皮的四倍。

    图  1  杜仲中木质素类的成分结构[3]
    Figure  1.  Composition structure of lignin in Eucommia ulmoides[3]

    环烯醚萜类是蚁臭二醛的缩醛衍生物,在双子叶植物中含量较高。环氧化、羟基化以及由莽草酸途径得到的酯化的芳香酸使其骨架结构多样(图2[20-21]。目前,已从杜仲的不同部位中分离得到30种环烯醚萜类化合物[3],主要存在于杜仲叶和杜仲皮中(表1),包括京尼平苷(Ⅰ)、京尼平苷酸(Ⅱ)、桃叶珊瑚苷(Ⅲ)、筋骨草苷(Ⅳ)(图3)、杜仲苷类和杜仲醇类[14,22-24]等,其中京尼平苷酸以其明显的消炎作用闻名。

    表  1  杜仲中环烯醚萜类化合物的分布[3]
    Table  1.  Distribution of iridoids in Eucommia ulmoides[3]
    序号环烯醚萜类化合物存在部位
    1京尼平树皮
    2桃叶珊瑚苷树皮
    3scandoside 10-O-acetate树叶
    4京尼平苷树皮
    5京尼平苷酸树皮/树叶
    6车叶草苷酸树叶
    7脱乙酰车叶草苷酸树叶
    8哈帕苷丁酸脂树皮
    9筋骨草甙树皮
    10匍萄筋骨草甙树皮
    11杜仲甙Ⅰ树皮
    12杜仲醇树皮/树叶
    13杜仲甙Ⅱ树叶
    14去氧杜仲醇树皮/树叶
    15Epieucommiol树叶
    16车叶草苷树叶
    17杜仲甙树皮
    18Eucomoside A树叶
    19Eucomoside B树叶
    20Eucomoside C树叶
    21栀二醇树皮
    22交让木苷树叶
    23鸡失藤甙甲酯树叶
    24马线子苷树叶
    257-epi-loganin树叶
    268-epi-loganin树叶
    27脱乙酰车叶草苷酸树叶
    28哈巴苷树皮
    29梓醇树皮
    30杜仲甙C树叶
    31杜仲甙D树叶
    下载: 导出CSV 
    | 显示表格
    图  2  环烯醚萜化学结构[18]
    Figure  2.  Chemical structure of iridoids[18]
    图  3  杜仲中环烯醚萜化合物的化学结构[3]
    Figure  3.  Chemical structure of iridoids from Eucommia ulmoides[3]

    张威鹏等[25]采用高效液相色谱变波长-梯度洗脱法,以树龄和部位为变量,测得不同部位的杜仲中的苯丙素类含量。实验发现,在相同生长时期,杜仲叶中的苯丙素类成分含量最高,其次是干皮,最后是枝皮。杜仲叶中的苯丙素类含量随树龄的增长,整体出现减少的趋向。杜仲叶中苯丙素类的主要成分有绿原酸、咖啡酸、松柏苷、原儿茶酸、紫丁香苷,其中绿原酸因具有杀菌、消炎、抗衰老等多种药理作用,已被规定为某些药用植物的质量限定准则[26]

    杜仲中黄酮类物质含量较高,是检测杜仲质量的另一关键指标。黄酮类化合物在杜仲雄花和叶的分布较多,杜仲叶中总黄酮的含量高达10.05%[27]。陈景超等[28]通过比较杜仲叶中黄酮成分含量的不同提取方法得出酶解法提取效率最高,且此法不用任何有机溶剂,对人体较安全,可考虑工厂化。目前从杜仲中分离纯化出的黄酮类化合物共有36种,包含芦丁、山奈酚、槲皮素、紫云英苷、金丝桃苷等[3,29-30]

    多糖是近年来新发现杜仲叶中的活性物质,含量丰富[27,31]。王莹等[27]研究发现,时间和地域对杜仲叶多糖含量有显著影响。张学俊等[32]对杜仲叶多糖结构进行解析,发现杜仲叶多糖由鼠李糖、D-岩藻糖、D-阿拉伯糖、D-木糖、D-葡萄糖、D-半乳糖六种单糖基组成。陈蕾[33]利用水提法和微波辅助法分别提取杜仲叶和皮中的多糖,结果发现杜仲叶和杜仲皮的多糖结构特性几乎没有差别,且不受提取方式的影响。

    酚类化合物是由一个羟基代替苯环上的氢原子形成的带有酚羟基的化合物。邓云云等[34]分别用60%的甲醇和60%的乙醇提取杜仲皮和叶中的总酚,得出杜仲叶中的多酚类化合物含量明显高于杜仲皮,分别是59.100和66.720 mg/g,杜仲皮中提取的总酚含量仅为8.729和7.414 mg/g。且总酚含量质量受气候因子、土壤因子及地理因子等生态因子的影响。影响杜仲叶品质的主导气候因子是温度及蒸发量。多酚类化合物含量随泥土中有效态铁、锌、锰、硼的含量增加而增加[35]

    杜仲胶是分子结构为反式聚异戊二烯的具有橡胶和塑料二重性的优异高分子材料,是橡胶的异构体,即顺聚异戊二烯(图4)。室温下坚韧,无色,可结晶,化学性质活泼,易氧化变成乳白色质地脆弱的物体。胶粘剂室温硬度高,常温成型,门尼粘度高,抗冲击强度高,热熔结合性能好,是一种具有前途的材料,在许多领域都有潜在的应用前景[36]

    图  4  杜仲胶和橡胶树胶的分子结构[33]
    Figure  4.  Molecular structure of gutta-percha and rubber gum[33]

    周芳等[37]采取气相色谱-质谱联用/选择性离子检测(GC-MS/SIM)方法对杜仲叶进行测定,共测出15种氨基酸,其中有七种为人体所必需的游离氨基酸。周利兵等[38]以此为基础分析不同产地杜仲叶的氨基酸含量发现,湖北省恩施州和云南省昆明市杜仲叶的氨基酸含量较高,湖南省常德市和重庆长寿杜仲叶的含量较低。除此之外,杜仲叶中还富含维生素、矿物质和胡萝卜素,其中钾、钠含量较高,约是杜仲皮的3倍 [3,31]

    杜仲叶有多种保健功能,大量研究证明,杜仲叶具有抗氧化、抗炎杀菌、降压、降脂降糖、免疫调节、抗癌、抗衰老、抗骨质疏松等作用。

    与杜仲皮、花和果实相比,杜仲叶具有更强的抗氧化活性[34,39]。杜仲叶中抗氧化成分较多,如环烯醚萜类化合物、酚类化合物、苯丙素类化合物、木质素类化合物、多糖和维生素等,其中酚类物质是植物中最活跃的抗氧化剂,其抑制自由基反应的作用机制不止一种,如改善机体抗氧化酶,多酚的金属螯合电位对铁和铜诱导的自由基反应起保护作用,酚羟基的氢与自由基结合等[40-42]。刘静[43]测定杜仲叶提取物对 O2 ·和·OH的清除率、对小鼠红细胞氧化溶血的影响和对各脏器丙二醛(Malondialdehyde,MDA)生成的抑制率,评价杜仲叶提取物的体外抗氧化作用,结果表明杜仲叶提取物具有显著的体外抗氧化能力。王翔等[44]实验证明杜仲叶提取物对ABTS+、·OH和DPPH·均有清除效果,其效果与总黄酮含量和酚类含量呈正相关。杜仲叶被证实有良好的抗氧化活性,作为天然抗氧化剂,在化妆品、食品、药品等领域极具应用前景。

    杜仲叶醇提物能够显著改善大鼠肝脏缺血再灌注引起的炎症反应,且效果优于杜仲皮,猜测环烯醚萜苷类成分可能是杜仲叶抗炎作用的主成分之一。杨志友等[45]以小鼠小胶质细胞(BV2)为研究对象证明杜仲叶中环烯醚萜苷类主成分京尼平苷酸(Geniposidic acid,GEN)具有抗炎杀菌性,当BV2小胶质细胞被激活释放大量炎症因子时,京尼平苷酸通过阻拦p38蛋白和p65蛋白的磷酸化,降低脂多糖(lipopolysaccharide,LPS)诱导的NO和促炎细胞因子白细胞介素-1β(interleukin-1β,IL-1β)、白细胞介素-6(interleukin-6,IL-6)、肿瘤坏死因子-α(tumor necrosis factor-α,TNF-α)的释放。此外,杜仲叶中作为环烯醚萜类化合物的桃叶珊瑚苷有明显的抗炎作用。桃叶珊瑚苷类化合物能够有效抑制炎症因子IL-6和白细胞介素-10(interleukin-10,IL-10)的释放,且对NO释放具有中等程度的抑制作用,同时抑制γ-干扰素(interferon γ,IFN-γ)磷酸化进而抑制其活性;还能作为核因子κB(nuclear factor kappa-B,NF-κB)的特异性抑制剂,起到抗炎的作用[46]

    绿原酸是杜仲叶中的主要抗炎杀菌成分之一。绿原酸对气单胞菌科、大肠杆菌、金黄色葡萄球菌、枯草芽孢杆菌、停球链球菌、沙门氏菌、乳房链球菌等均有一定的抑菌作用[47],同时,绿原酸也被证实有增加肠道菌群多样性、维持肠道菌群稳定的作用[48]。此外,杜仲叶提取物对黄曲霉和黑曲霉有良好的抑菌效果,且抑菌活性具有热稳定性[49]

    医学实验证明,杜仲叶是最原始的降压药材。已知的杜仲叶的降压成分共有四类,分别为木质素类、苯丙素类、环烯醚萜类和黄酮类。其中,木质素类化合物的降压功能是杜仲中研究的较透彻的一种药理作用,李旭等[50]提取杜仲叶中绿原酸进行了降血压活性实验,得出杜仲叶中的绿原酸具有降压作用,且高剂量组的降压效果具有显著性。雷燕妮和张小斌[51]通过建立高血压大鼠模型并提取杜仲叶中总黄酮灌胃9 d,发现大鼠收缩压均有不同程度的降低,得出总黄酮对降血压有显著作用的结论。此外,杜仲叶中的2种环烯醚萜类化合物成分被证明具有降压效果[3]

    我国古代百姓曾用杜仲叶泡水来治疗糖尿病,郎茜等[52]研究发现杜仲叶多糖具有一定的降血糖的作用,能降低糖尿病模型大鼠空腹血糖和尿素氮含量。同时,多糖浓度与半胱氨酸蛋白酶-3(Caspase-3)、p38蛋白及转化生长因子-β1(transforming growth factor-β,TGF-β1)等蛋白基因量的表达呈现负相关的关系,证明其具有良好的降血糖活性。乔红伟等[53]通过建立大鼠混合型高脂血症动物模型,灌胃30 d发现杜仲叶对大鼠具有辅助降血脂的作用。杜仲叶不仅有降糖降脂的作用,还对人体无任何毒副作用[54],因此杜仲叶作为新型天然药物的市场前景十分开阔,但其降糖降脂机制尚不明确,构效关系尚不清晰。

    杜仲叶的大部分活性成分如多糖类、环烯醚萜类、黄酮类、维生素、微量元素及其浸取液等都被证明可以增强人体免疫力。徐贤柱等[55]采用水提的方式提取杜仲叶多糖,将其分为高中低三个剂量组并以生理盐水作为空白对照组,连续灌胃30 d后发现杜仲叶多糖可以增加小鼠脾脏重量和指数,提高其对免疫应答的能力。同时杜仲叶多糖不会影响胸腺,对胸腺的正常运作无抑制作用。叶颖霞等[56]实验研究发现杜仲叶多糖可以增加小鼠的胸腺和脾脏系数,提高血清中抗体的数量和巨噬细胞的吞噬功能的方式,以达到增强免疫力的目的。Yang等[57]的研究显示京尼平苷酸是调节细胞免疫和体液免疫方面的主要有效成分。同时,较高剂量杜仲叶可抑制小鼠腹腔巨噬细胞中NO和前列腺素E2的产生。袁带秀等[58]建立小鼠铅中毒模型后给予总黄酮治疗,测得模型小鼠免疫器官组织中MDA含量显著降低,总体抗氧化酶活性、超氧化物歧化酶(superoxide dismutase,SOD)、谷胱甘肽过氧化物酶(glutathione peroxidase,GSH-Px)显著上升,证明总黄酮对免疫系统的损坏有一定修复功能。腹腔巨噬细胞和单核巨噬细胞系统的活性能被杜仲的水提液和乙醇提取液激活,迟发型超敏反应还能被抑制,从而发挥双向调节细胞免疫的作用。杜仲叶的免疫调节目前研究较透彻,未来有望作为食品配料加入食品中,拓宽保健食品市场。

    栾芳菲等[59]采用噻唑蓝(MTT)比色法和流式细胞仪测定了杜仲叶提取物(EULE)对人结直肠癌细胞(HCT116)和人脐静脉内皮细胞(HUVEC)体外增殖和凋亡的影响,发现杜仲叶水提物具有阻抑细胞增殖、加速细胞凋亡的特点。在此基础上,张胜等[60]深入探究杜仲叶中主要活性成分对癌细胞的作用机制,发现在杜仲叶中含量较高的活性成分绿原酸和京尼平苷酸中,绿原酸有显著的加速细胞凋亡、遏制HCT116细胞生长的效果,且绿原酸属于酚酸,有多位学者曾实验证实酚酸可抗癌抗诱变。截至目前,癌症仍是人们的心头大患,而杜仲叶良好的抗癌活性为其未来临床应用奠定了基础。

    杜仲叶主要通过增强免疫作用、清除自由基、促进胶原蛋白合成、减少其降解等方式达到抗衰老的目的。李小安等[61]利用向小鼠注射D-半乳糖的办法制成脑内单胺氧化酶B活力降低、脂褐质含量增加、细胞C3b受体花环结合率及免疫复合物花环结合率降低的小鼠亚急性衰老模型,结果表明杜仲叶浸膏粉具有抗衰老的作用,推测其作用机理可能是改善中枢神经递质、提高红细胞免疫力和抗氧化能力来引发抗衰老作用。赵晖[62]研究发现,杜仲中的京尼平苷酸、桃叶珊瑚苷等环烯醚萜单苷类物质呈剂量依赖性地加速胶原蛋白合成和皮肤角质层更新,延缓衰老的进程,且暂未发现任何不良影响。Li等[63]实验表明,桃叶珊瑚苷、京尼平苷酸、京尼平能促进大鼠衰老模型的胶原蛋白合成,促进形成肉芽肿,京尼平苷酸还能提高角质层更新率,对抗皮肤老化。张缓[64]研究发现,EUB-4(桃叶珊瑚苷)、EUB-2(车叶草苷)、EUB-17(Eucommia A)等对H2O2及UV损伤的人胚皮肤成纤维细胞株(ESF-1)都有显著保护作用。由此,将杜仲叶作为天然原料加入化妆品,开发出新型天然无害的植物精萃类化妆品具有重大现实意义。

    戴鹏等[65]制定详细的计划来评价杜仲叶醇提取物防治绝经后骨质疏松症的模型大鼠引起的骨质疏松症的能力后得出,杜仲叶具有打破骨代谢平衡的能力,拥有“强筋骨”的作用。杜仲叶防治骨质疏松的主要活性成分为木质素类、酚酸、黄酮类及苯丙素类等。杜仲叶可防止骨中钙和磷元素流失过多,使钙和磷元素在骨中沉积。此外,根据成骨细胞体外培养实验得出,杜仲叶提取物能加速骨细胞增殖,促进骨形成[66]。目前,应用于杜仲叶防治骨质疏松的临床试验研究较匮乏,有待考察。

    刘迪等[67]采用大孔吸附树脂法来获取杜仲叶粗提物,得到杜仲叶的树脂分离纯化产物具有抗疲劳的作用,且抗疲劳功效与多酚含量有关。中医常用杜仲来安胎。吕锦芳等[68]使空怀兔子宫分离,观察杜仲不同部位制得的水煎剂与其平滑肌运动性能的关系,发现杜仲各部位对子宫均有安胎作用;杜仲叶中大量的钾元素和桃叶珊瑚苷均能促进尿液分泌,具有利尿的作用[69];杜仲叶提取物还能保护小鼠的肝脏,加速机体恢复[70]

    杜仲的药理作用在中国第一本药书《神农本草经》中就有记载,李时珍在《本草纲目》中也表示杜仲是十分珍贵的中药材,因此杜仲有“植物黄金”的美誉。杜仲浑身上下都是宝,杜仲叶作为食品原料在湖南省和河南省等地区均有食用历史,主要方法为杜仲嫩叶做菜、煮粥、制成杜仲茶或用榨取杜仲叶汁加入面团等,且截至目前无任何正常食用杜仲产生不良影响的报道。随药食同疗类食品的热度大增,人们逐渐将目光聚焦于资源丰富、营养价值高的杜仲叶的食品研发方面。

    杜仲茶是杜仲食品类研究最多、生产最广泛的一类。20世纪80年代以来,日本首次掀起“杜仲茶”热潮,随后欧亚一些国家和地区也纷纷加入这波热度。值此浪潮,我国也开始制作杜仲茶,主要用于进出口[71]。实践发现,长期饮用具有减肥、美容、降压、治疗心律不齐、增强记忆、恢复体能等作用[72]。单用杜仲叶一种原料制成的杜仲茶,往往带有青涩的香味,引起部分消费者的不适。为了制成大众均能接受的茶饮,在纯杜仲茶中加入30%左右的茉莉花茶或中上档的乌龙茶,可有效改良茶香味。近期贵州省、陕西省等地生产的杜仲茶,都加入不同比值的茉莉花茶,香味较易于大众接受。

    岳红等[72]以杜仲叶为主要原料,加入核桃仁,制作出一款甜味适中、适合中老年人长期饮用的核桃仁杜仲叶复合饮料。叶文峰等[73]在主原料为杜仲叶的基础上添加苹果汁等开发出了一款安全无毒、清爽可口的复合饮料。张志健等[74]将杜仲叶中加入蜂蜜、柠檬酸等辅料研制出一种口感酸甜的杜仲叶饮料。刘亮等[75]混合牛乳和杜仲茶粉制作出一款具有保健功能的酸奶,其色香味俱全,受到广泛好评。

    除上述食品外,有人将杜仲叶的浸膏粉作为添加剂,生产具有特定功能保健作用的食品,如杜仲饼干、杜仲糖、杜仲果冻等;有人将杜仲叶制成菜点食品并进行推广,成都某餐厅已投入实践,受到好评;还有人将其添加到主食中去,增加主食的营养保健性。特别是杜仲叶的抗衰老和对骨骼和肌肉中胶原蛋白的合成和分解作用,加以善用,可为太空食品的开发提供良好基础。

    目前虽有多位学者提出杜仲叶和杜仲皮活性成分和药理作用相似,倡导大众将杜仲叶代替杜仲皮开发使用,但对于杜仲叶中各种活性成分的作用机制尚未明确,且应用于临床、食品、药品等领域缺乏安全性评价,需要进一步明确其作用机制,对其毒理学作用进行有效评价,为后续杜仲叶产业化开发奠定理论基础。本文整理多个实验发现杜仲叶和杜仲皮的活性成分含量有较大差别,因此想要杜仲叶完全替代杜仲皮的药理作用,还要明确杜仲叶的用量,对其进行定量研究。尽管杜仲叶作为药食同源物质已在广西等地设定试点,国家还应加强对杜仲叶开发的政策引导,扩大试点范围,加速其作为新资源食品应用市场的进程。此外,杜仲叶精深加工产品种类主要集中在饮品开发,种类较单一,各厂家与其不断美化产品外观、加强营销,不如将目光聚焦于开发杜仲叶产品种类,拓宽杜仲叶销路。

  • 图  1   杜仲中木质素类的成分结构[3]

    Figure  1.   Composition structure of lignin in Eucommia ulmoides[3]

    图  2   环烯醚萜化学结构[18]

    Figure  2.   Chemical structure of iridoids[18]

    图  3   杜仲中环烯醚萜化合物的化学结构[3]

    Figure  3.   Chemical structure of iridoids from Eucommia ulmoides[3]

    图  4   杜仲胶和橡胶树胶的分子结构[33]

    Figure  4.   Molecular structure of gutta-percha and rubber gum[33]

    表  1   杜仲中环烯醚萜类化合物的分布[3]

    Table  1   Distribution of iridoids in Eucommia ulmoides[3]

    序号环烯醚萜类化合物存在部位
    1京尼平树皮
    2桃叶珊瑚苷树皮
    3scandoside 10-O-acetate树叶
    4京尼平苷树皮
    5京尼平苷酸树皮/树叶
    6车叶草苷酸树叶
    7脱乙酰车叶草苷酸树叶
    8哈帕苷丁酸脂树皮
    9筋骨草甙树皮
    10匍萄筋骨草甙树皮
    11杜仲甙Ⅰ树皮
    12杜仲醇树皮/树叶
    13杜仲甙Ⅱ树叶
    14去氧杜仲醇树皮/树叶
    15Epieucommiol树叶
    16车叶草苷树叶
    17杜仲甙树皮
    18Eucomoside A树叶
    19Eucomoside B树叶
    20Eucomoside C树叶
    21栀二醇树皮
    22交让木苷树叶
    23鸡失藤甙甲酯树叶
    24马线子苷树叶
    257-epi-loganin树叶
    268-epi-loganin树叶
    27脱乙酰车叶草苷酸树叶
    28哈巴苷树皮
    29梓醇树皮
    30杜仲甙C树叶
    31杜仲甙D树叶
    下载: 导出CSV
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  • 收稿日期:  2021-05-11
  • 录用日期:  2022-03-09
  • 网络出版日期:  2022-03-18
  • 刊出日期:  2022-05-14

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