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西药一 学习笔记 倒计时197天

  • 2026-04-17 19:16:25
西药一 学习笔记 倒计时197天

西药一 学习笔记 倒计时197天

第六章 药物的结构与作用
第二节 药物代谢
一、与葡萄糖醛酸的结合反应
1. 结合类型:是体内最常见、最重要的结合反应,包括O、N、S、C的苷化,以及O、N、S的酯化及酰胺化。
​2. 临床特殊点:新生儿体内肝脏尿苷二磷酸葡萄糖醛酸转移酶活性尚未健全,使用氯霉素时,无法使其与葡萄糖醛酸结合排出体外,会引起“灰婴综合征”。
​3. 典型案例(吗啡):吗啡的3-酚羟基和6-羟基可与葡萄糖醛酸结合:
​- 生成3-O-葡萄糖醛酸苷物:是弱的阿片受体激动剂,活性大幅降低。
​- 生成6-O-葡萄糖醛酸苷物:是较强的阿片受体激动剂,仍有显著活性。
​4. 口诀:葡萄绿了吗?
二、与硫酸的结合反应
1. 特点:主要发生在酚羟基上,生成稳定的硫酸酯,水溶性显著提升,易排出体外。
​2. 典型案例(沙丁胺醇):结构中含有3个羟基,但只有酚羟基可形成稳定的硫酸酯,另外两个醇羟基不能发生该反应。
3. 口诀:流沙河
三、与氨基酸的结合反应
1. 特点:是体内许多羧酸类药物和代谢物的主要结合反应,其中与甘氨酸的结合反应最为常见。
​2. 典型案例:苯甲酸、水杨酸在体内参与结合反应后,分别生成马尿酸、水杨酰甘氨酸,随尿液排出。
四、与谷胱甘肽的结合反应
1. 谷胱甘肽(GSH):由谷氨酸、半胱氨酸、甘氨酸组成的含有巯基的三肽化合物。
​2. 作用机制:
​- 巯基(-SH)具有亲核作用,可清除代谢产生的有害亲电性物质,解除药物毒性。
​- 谷胱甘肽还具有氧化-还原性质,可参与体内氧化还原反应。
​3. 典型案例:抗肿瘤药物白消安可与谷胱甘肽结合,解除毒性。
​4. 口诀:白骨精(白消安、谷胱甘肽、解毒)
五、乙酰化结合反应
1. 反应特点:
​- 属于外来物的去活化反应,可使药物的极性、亲水性降低,水溶性减小,不利于排出。
​- 可发生反应的基团:伯胺基、氨基酸、磺酰胺、肼和酰肼等。
​2. 典型案例:对氨基水杨酸经乙酰化反应后,生成对乙酰氨基水杨酸,水溶性降低。
六、甲基化结合反应
1. 反应特点:
​- 与乙酰化反应类似,会降低被结合物的极性和亲水性,不利于药物排出。
​- 主要作用不是促进排泄,而是降低药物的生物活性。
​2. 可参与反应的基团:酚羟基、胺基、巯基等。

内蒙古,13分钟前,

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  136. /yingpanguazai/ssd/ssd1/www/no.67808.cn/vendor/topthink/think-template/src/Template.php ( 46.61 KB )
  137. /yingpanguazai/ssd/ssd1/www/no.67808.cn/vendor/topthink/think-template/src/template/driver/File.php ( 2.41 KB )
  138. /yingpanguazai/ssd/ssd1/www/no.67808.cn/vendor/topthink/think-template/src/template/contract/DriverInterface.php ( 0.86 KB )
  139. /yingpanguazai/ssd/ssd1/www/no.67808.cn/runtime/temp/6df755f970a38e704c5414acbc6e8bcd.php ( 12.06 KB )
  140. /yingpanguazai/ssd/ssd1/www/no.67808.cn/vendor/topthink/think-trace/src/Html.php ( 4.42 KB )
  1. CONNECT:[ UseTime:0.000530s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.000901s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000293s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.000269s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.000491s ]
  6. SELECT * FROM `set` [ RunTime:0.000206s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.000504s ]
  8. SELECT * FROM `article` WHERE `id` = 481606 LIMIT 1 [ RunTime:0.003185s ]
  9. UPDATE `article` SET `lasttime` = 1776429570 WHERE `id` = 481606 [ RunTime:0.006862s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000246s ]
  11. SELECT * FROM `article` WHERE `id` < 481606 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.000561s ]
  12. SELECT * FROM `article` WHERE `id` > 481606 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.000469s ]
  13. SELECT * FROM `article` WHERE `id` < 481606 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.000648s ]
  14. SELECT * FROM `article` WHERE `id` < 481606 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.000678s ]
  15. SELECT * FROM `article` WHERE `id` < 481606 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.000630s ]
0.084549s