【简答题】【消耗次数:1】
三萜皂苷的分离常采用[填空1]柱色谱,常用[填空2]为支持剂。
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相关题目
【简答题】 三萜皂苷的分离常采用[填空1]柱色谱,常用[填空2]为支持剂。
【多选题】 区别三萜皂苷与甾体皂苷的方法
①  泡沫试验
②  三氯化铁-冰醋酸
③  氯仿-浓硫酸反应
④  20%三氯醋酸反应
⑤  Liebermann-Burchard反应
【简答题】 皂苷产生溶血作用的原因,是皂苷能与[填空1]结合生成如溶性分子[填空2]。
【简答题】 皂苷产生溶血作用的原因,是皂苷能与[填空1]结合生成如溶性分子[填空2]。
【单选题】 三萜皂苷结构所具有的共性是
①  5个环组成
②  一般不含有羧基
③  均在C3位成苷键
④  有8个甲基
⑤  苷元由30个碳原子组成
【多选题】 含三萜皂苷类中药制剂在制备样品时,常用的净化方法有
①  萃取法
②  氧化提取法
③  还原提取法
④  水解法
⑤  色谱柱法
【单选题】 溶剂沉淀法分离皂苷是利用总皂苷中各皂苷
①  酸性强弱不同
②  在乙醇中溶解度不同
③  极性不同
④  难溶于石油醚的性质
⑤  分子量大小的差异
【单选题】 主要含有三萜皂苷类指标性成分的中药是
①  人参
②  陈皮
③  葛根
④  麻黄
⑤  槐米
【简答题】 香豆素常用提取分离方法有[填空1],[填空2],[填空3]。
【简答题】 香豆素常用提取分离方法有[填空1],[填空2],[填空3]。
随机题目
【单选题】 Shakespeare’s greatest tragedies are the following works except ____.
①  Hamlet
②  King Lear
③  Romeo and Juliet
④  Othello
【单选题】 Which of the following is NOT true about The Canterbury Tales?
①  It is written in the form of a dream.
②  Chaucer chose a pilgrimage as the framework for the stories.
③  It is written for the greater part in heroic couplet.
④  “The General Prologue” introduces the pilgrims, the time and occasion of the pilgrimage.
【单选题】 Beowulf, the oldest great long poem ever written in English, is composed in a form of____.
①  epics
②  lyrics
③  folk songs
④  sagas
【单选题】 What meaning is referred to if we say the meaning of “dog” is friendship and loyalty?
①  denotative meaning
②  connotative meaning
③  literal meaning
④  labeled meaning.
【单选题】 What does it mean to know a word?
①  know its pronunciation and stress
②  know its spelling and grammatical properties
③  know its meaning and know when and how to use it
④  all of the above.
【单选题】 Which of the following statement is not true about vocabulary?
①  a vocabulary item can be more than one word
②  Vocabulary can not be taught. It must be learned by the individuals
③  Words are best learned in context
④  An English-English dictionary is an important aid for students.
【单选题】 What meaning is referred to if we say the meaning of “dog” is an animal with four legs and a tail, often kept as a pet or trained for work?
①  denotative meaning
②  connotative meaning
③  extended meaning
④  inspired meaning.
【单选题】 What do the following examples indicate? Big, huge; enormous, immense; male, masculine .
①  synonyms
②  antonyms
③  hyponyms
④  collocations.
【单选题】 What is referred to if we say “see a movie, watch a play, look at a picture”?
①  denotative meaning
②  connotative meaning
③  collocations
④  synonyms.
【单选题】 What are two categories of vocabulary?
①  Receptive vocabulary and productive vocabulary
②  innate vocabulary and learned vocabulary
③  familiar vocabulary and unfamiliar vocabulary
④  new vocabulary and old vocabulary.