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中药材化学成分糖类学习笔记

  • 2026-02-22 10:54:38
中药材化学成分糖类学习笔记

一、 糖的“家族”图谱:按聚合度分类
总口诀:单糖独行侠,寡糖小分队,多糖大家族。

1. 单糖——糖世界的“基石”
(1)定义:多羟基醛或酮,不可再水解的最小糖单元。
(2)核心考点:
①中药常见单糖:葡萄糖、鼠李糖、半乳糖、阿拉伯糖、葡萄糖醛酸、果糖。
②葡萄糖醛酸是中药中常见的酸性单糖,参与形成苷类(如甘草酸)。
③单糖的“身份证”分类(结构分类) 

(3)记忆口诀:五醛木阿核,六醛葡甘半,甲五鼠李糖,酮糖是果糖,羧酸糖醛酸。
2. 寡糖——精干的“小分队”
(1)定义:由 2~9个 单糖通过糖苷键连接而成。
(2)核心考点:
①还原糖:含有游离的醛基或酮基,能还原斐林试剂。如:槐糖、樱草糖、麦芽糖。
②非还原糖:无游离羰基。如:蔗糖(葡萄糖+果糖)、海藻糖。
(3)记忆技巧:两个单糖的“半缩醛羟基”都参与成键,则无游离羰基,即为非还原糖。
(4)常见与苷元连接的二糖(常出现在苷类结构中):芸香糖、龙胆二糖、新橙皮糖、槐糖、昆布二糖等。
(5)特别记忆:芸香糖(鼠李糖+葡萄糖)是黄酮苷(如芦丁)中最常见的二糖。
3. 多糖——庞大的“大家族”
(1)定义:由 10个以上 单糖聚合而成的高分子化合物。
(2)核心考点——按功能分类:

(3)淀粉的细分考点:
①糖淀粉(直链淀粉):遇 碘呈深蓝色。
②胶淀粉(支链淀粉):遇 碘呈紫红色。
(4)记忆:直蓝(谐音“指南”),支紫(谐音“吱吱”)。

二、 糖的“七十二变”:主要化学反应
口诀:糖反应,看基团:羟基可酰化,醛基易氧化。
1. 氧化反应(针对还原糖的醛/酮基)
(1)斐林反应(Fehling):还原糖将Cu²⁺还原为砖红色Cu₂O沉淀 → 鉴定还原糖。
(2)溴水氧化:将醛糖的醛基氧化为羧基,生成糖酸。酮糖不被溴水氧化 → 区分醛糖与酮糖。
(3)过碘酸氧化:能氧化连有羟基的碳碳键(邻二醇结构)。
(4)应用:推断糖苷中糖与糖、糖与苷元的连接位置。
(5)特点:反应定量进行,通过测定甲酸消耗量可判断连接方式。

2. 羟基反应(糖的羟基非常活泼)
(1)酰化反应:如乙酰化(用醋酐),用于保护羟基或制备衍生物。
(2)醚化反应:如甲醚化(用CH₃I),用于结构测定(全甲基化后水解,可判断连接位点)。
(3)硼酸络合反应:邻二羟基可与硼酸形成络合物,使溶液电导率、旋光度改变 → 用于糖的分离、鉴定。
3. 羰基反应
主要体现为还原糖的氧化性(如上述)以及与苯肼等试剂生成糖脎(用于糖的鉴定)。

三、执业药师考点速记与答题钥匙
1.看见“单糖” → 立刻想到葡萄糖、鼠李糖、半乳糖、葡萄糖醛酸。
2.问“非还原糖” → 秒选蔗糖、海藻糖。
3.问“与苷元连接的二糖” → 高频答案是芸香糖(黄酮苷)、龙胆二糖。
4.问“淀粉遇碘” → 直链蓝,支链紫。
5.问“用于结构测定的反应” → 优先考虑过碘酸氧化(确定连接位置)和全甲基化醚化(确定羟基位置)。
6.区分醛糖酮糖 → 用溴水,醛糖反应,酮糖不反应。

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  1. CONNECT:[ UseTime:0.000941s ] mysql:host=127.0.0.1;port=3306;dbname=no_67808;charset=utf8mb4
  2. SHOW FULL COLUMNS FROM `fenlei` [ RunTime:0.001266s ]
  3. SELECT * FROM `fenlei` WHERE `fid` = 0 [ RunTime:0.000607s ]
  4. SELECT * FROM `fenlei` WHERE `fid` = 63 [ RunTime:0.007473s ]
  5. SHOW FULL COLUMNS FROM `set` [ RunTime:0.001369s ]
  6. SELECT * FROM `set` [ RunTime:0.000571s ]
  7. SHOW FULL COLUMNS FROM `article` [ RunTime:0.001451s ]
  8. SELECT * FROM `article` WHERE `id` = 469360 LIMIT 1 [ RunTime:0.000772s ]
  9. UPDATE `article` SET `lasttime` = 1771771630 WHERE `id` = 469360 [ RunTime:0.008055s ]
  10. SELECT * FROM `fenlei` WHERE `id` = 65 LIMIT 1 [ RunTime:0.000549s ]
  11. SELECT * FROM `article` WHERE `id` < 469360 ORDER BY `id` DESC LIMIT 1 [ RunTime:0.001362s ]
  12. SELECT * FROM `article` WHERE `id` > 469360 ORDER BY `id` ASC LIMIT 1 [ RunTime:0.001017s ]
  13. SELECT * FROM `article` WHERE `id` < 469360 ORDER BY `id` DESC LIMIT 10 [ RunTime:0.003800s ]
  14. SELECT * FROM `article` WHERE `id` < 469360 ORDER BY `id` DESC LIMIT 10,10 [ RunTime:0.004119s ]
  15. SELECT * FROM `article` WHERE `id` < 469360 ORDER BY `id` DESC LIMIT 20,10 [ RunTime:0.006033s ]
0.216126s