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中药材化学成分三萜类化合物学习笔记

  • 2026-02-27 23:53:00
中药材化学成分三萜类化合物学习笔记

一、 核心定义与结构总览
1.定义:由三萜皂苷元(30个碳,C₃₀) 和糖链通过苷键连接而成。
2.特点:苷元多具羧基,显酸性,故又称酸性皂苷。水溶液振摇可产生持久性泡沫。
3.结构分类主线:根据苷元母核环的数目,分为 四环三萜与五环三萜两大类。

4.分类速记口诀:
“四环外(四环)打(达玛)羊毛,五环外乌鸦(乌苏)羽毛(羽扇豆)齐(齐墩果)飞。”
二、 结构分类详解与代表物
1. 四环三萜

(1)结构式

(2)对比速记表格

2. 五环三萜

(1)结构式

(2)对比速记表格
3. 考点聚焦:

(1)达玛烷型是人参、三七的专属结构类型。
(2)齐墩果烷型是分布最广的类型,甘草、柴胡、商陆、黄芪的核心成分均属此类。

三、 含三萜皂苷“明星中药”与质控成分
1.总口诀:三(三七)人(人参)合(合欢皮)黄(黄芪)商(商陆)甘(甘草)柴(柴胡)。

2.对比速记表格

四、 重点中药的独特考点与药理
1. 甘草——解毒与代谢的奥秘
(1)核心成分:甘草酸(甘草甜素)。
(2)独特考点:
①酸性水解:甘草酸 + 5% H₂SO₄,加压加热 → 甘草次酸 + 2葡萄糖醛酸。

②体内代谢:甘草酸(口服难吸收)→ 肠道菌群水解 → 甘草次酸(脂溶性增强,易吸收,可入脑)→ 发挥药理作用。这解释了甘草酸为何是前体药物。

(3)核心药理:解毒(对多种毒素)、抗溃疡、止咳祛痰。
2. 人参/三七——达玛烷型双雄
(1)共同点:质控成分均含人参皂苷Rg1、Re、Rb1,均为达玛烷型。

(2)区别点:三七特有 三七皂苷R1。
(3)药理:
①人参:大补元气,增强免疫、改善记忆、强心。
②三七:活血定痛,抗血栓、改善微循环、双向调节(活血又止血)。
3. 柴胡——退热与保肝
(1)核心成分:柴胡皂苷a、d(齐墩果烷型)。
(2)核心药理:解热、抗炎、保肝利胆、调节免疫。

五、核心性质与鉴别
1.性状:
多为无色或白色无定形粉末,味苦而辛辣。

2.溶解性:
(1)三萜皂苷:可溶于水,易溶于热水、热醇。其水溶液振摇后产生持久性泡沫(皂化反应)。
(2)三萜苷元:一般不溶于水,易溶于有机溶剂。
3.显色反应:
(1)Liebermann-Burchard反应(醋酐-浓硫酸反应):三萜皂苷最后呈红或紫色。
(2)三氯乙酸反应:加热后显色,可用于区分三萜与甾体皂苷。

六、思维导图记忆法

七、复习心法:
1.结构为根:抓住 “四环(达玛烷) vs 五环(齐墩果烷)” 这一核心分类,能解决一半以上的归属题。
2.中药为干:牢记 “三人合黄商甘柴” 七味中药,并精准记忆每味的质控成分(特别是人参/三七的异同,甘草的甘草酸)。
3.考点为眼:深度掌握甘草的特殊水解和体内代谢(前药转化),这是拉开差距的高阶考点。
4.药理为果:将核心药理与功效对应(如人参补气、三七活血、甘草解毒、柴胡退热),理解性记忆。

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  1. CONNECT:[ UseTime:0.000902s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001254s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000298s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000317s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000476s ]
  6. SELECT * FROM `set` [ RunTime:0.000194s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000548s ]
  8. SELECT * FROM `article` WHERE `id` = 470897 LIMIT 1 [ RunTime:0.000998s ]
  9. UPDATE `article` SET `lasttime` = 1772264165 WHERE `id` = 470897 [ RunTime:0.008437s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000241s ]
  11. SELECT * FROM `article` WHERE `id` < 470897 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000441s ]
  12. SELECT * FROM `article` WHERE `id` > 470897 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000386s ]
  13. SELECT * FROM `article` WHERE `id` < 470897 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.002159s ]
  14. SELECT * FROM `article` WHERE `id` < 470897 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.002460s ]
  15. SELECT * FROM `article` WHERE `id` < 470897 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.005788s ]
0.094827s