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英美文学选读要点总结精心整理下载版2

英美文学选读要点总结精心整理下载版2
英美文学选读要点总结精心整理下载版2

【英国】C hapter2 The Neoclassical Period(1660-1798)新古典主义

1. In short, it was an age full of conflicts and divergence of values.总之,这一时期是矛盾与价值观分歧的时期。

2. The eighteenth-century England is also known as the Age of Enlightenment or the Age of Reason.英国的十八世纪也同时是启蒙主义时代,或曰理性时代。

3. Its purpose was to enlighten the whole world with the light of modern philosophical and artistic ideas.运动的主旨便是用当代哲学与艺术思想的晨光启迪整个世界。

4. Enlighteners held that rationality or reason should be the only, the final cause of any human thought and activities. They called for a reference to order, reason and rules.启蒙者主张理性是任何人思想与行动的唯一缘由。他们大力提倡秩序,理性及法律。

5. As a matter of fact, literature at the time, heavily didactic and moralizing, became a very popular means of public education.其实,当时的文学作品种充满了说教与道德理念,就已经成为大众教育的良好工具。

6. Famous among the great enlighteners in England were those great writers like John Dryden, Alexander Pope, Joseph Addison and Sir Richard Steele, the two pioneers of familiar essays, Jonathan Swift, Daniel Defoe, Richard Brinsley Sheridan, Henry Fielding and Samuel Johnson.英国著名的启蒙主义文学家有约翰.德莱顿,亚历山大.蒲柏,约瑟夫.艾迪森与理查.斯蒂尔(这两位是现代散文的先驱),乔纳森.斯威夫特,丹尼尔.迪福,理查.B.谢立丹,亨利.费尔丁和塞缪尔.约翰逊。

7. In the field of literature, the Enlightenment Movement brought about a revival of interest in the old classical works.在文学领域,启蒙主义运动还使人们重新对古典时代的著作产生兴趣。

8. They believed that the artistic ideals should be order, logic, restrained emotion and accuracy, and that literature should be judged in terms of its service to humanity.他们认为理想的艺术应基于秩序,逻辑,确切及情感控制的基础上,而文学作品的价值评判标准应该看它是否为人文主义服务。

9. Thus a polite, urbane, witty, and intellectual art developed.由此一种温文尔雅,充满灵性的知识分子文学艺术发展起来。

10. Neoclassicists had some fixed laws and rules for almost every genre of literature.在几乎所有的文学形式中,新古典主义者们都设定了创作的规矩与条框。

11. Drama should be written in the heroic Couplets (iambic pentameter rhymed in two lines); the three unities of time, space and action should be strictly observed;

regularity in construction should be adhered to, and type characters rather than individuals should be represented.戏剧必须用英雄体偶剧(抑扬五音步的押韵双行诗)写就;时间,地点,事件三要素必须要遵循;写作的规矩必须要遵守,而作品中的人物要代表一类人,而不是个性化。

12. But it had a lasting wholesome influence upon English literature. (套话)但新古典主义对英国文学史产生过持久的全面的影响。

13. The poetic techniques and certain classical graces such as order, good form, unified structure, clarity and conciseness of language developed in this period have become a permanent heritage.在这一时期出现的诗歌技巧与古典气质,如秩序,优美的格式,统一的结构,简明的语言都成为永恒的文学传统。

14. The mid-century was, however, predominated by a newly rising literary form---the modern English novel, which, contrary to the traditional romance of aristocrats, gives a realistic presentation of life of the common English people.十八世纪中叶,还兴起一种崭新的文学形式----英国现代小说,这种文学与传统贵族的骑士文学相反,着重描写英国普通百姓的生活。

15. Among the pioneers were Daniel Defoe, Samuel Richardson, Henry Fielding, Laurence Sterne, Tobias George Smollett, and Oliver Goldsmith.英国现代小说的先驱有丹尼尔.迪福,塞缪尔.理查德,亨利.费尔丁,劳伦斯.斯泰思,托比亚斯.斯摩莱特以及奥立弗.哥尔斯密。

16. From the middle part to the end of the century there was also an apparent shift of interest from the classic literary tradition to originality and imagination, from society to individual, and from the didactic to the confessional, inspirational and prophetic. 从十八世纪中叶至十八世纪末,还出现了古典文学传统向独创性与丰富联想性的转移,社会描写向个性描写的转移,说教向忏悔,鼓励及预示的转移。

17. Gothic novels---mostly stories of mystery and horror.哥特式小说----主要讲述恐怖神秘的故事。

18. Jonathan Swift’s A Modest Proposal being generally regarded as the best model of satire, not only of the period but also in the whole English literary history.乔纳森.斯威夫特的《一个小小的建议》被公认为英国文学史上讽刺作品的经典。

(I)John Bunyan约翰.班扬

19. As a stout Puritan, he had made a conscientious study of the Bible and firmly believed in salvation through spiritual struggle.作为一个坚定的清教徒,他认真学习《圣经》,并深信人一定能通过精神上的奋斗得到拯救。

20. he made it possible for the reader of the least education to share the pleasure of reading his novel and to relive the experience of his characters.他的语言具体生动,情节鲜明真实,连没受过教育的人也能享受到阅读他的作品的乐趣。

21. Bunyan’s other works include Grace Abounding to the Chief of Sinners, The Life and Death of Mr.Badman, The Holy War and The Pilgrim’s Progress, Part II.班扬其他的作品还有《罪人头目的赦免》,《拜得门先生生死录》,《圣战》以及《天路历程》第二部

22. The Vanity Fair.名利场(节选《天路历程》第一部)

The Pilgrim’s Progress is the most successful religious allegory in the English language. Its purpose is to urge people to abide by Christian doctrines and seek salvation through constant struggles with their own weaknesses and all kinds of social evils.《天路历程》是英文作品中最成功的宗教寓言。它的主旨是让人们遵循基督教教义,并通过不断战胜自身弱点与身外的邪恶来获得拯救。

(II)Alexander Pope 亚历山大.蒲伯

23. Pope, a very sensitive man, would strike back hard, and in the constant verbal battles he developed a style of biting satire. 蒲伯本身是个很敏感的人,自然要用笔墨来反击,在此期间,他发展了犀利的讽刺文体。

24. For him the supreme value was order---cosmic order, political order, social order, aesthetic order, and this emphasis on order found expression in all of his works.对他来说秩序有着至高无上的价值-----宇宙秩序,政治秩序,社会秩序,美学秩序。这种对秩序与理性的强调深入到了他各部作品中。

25. Pope made his name as a great poet with the publication of An Essay on Criticism in 1711. The next year, he published The Rape of the Lock, a finest mock epic.1711年,他出版了散文《论批评》,从此奠定了他在诗坛的地位。次年,他又出版了《夺发记》,一部极妙的讽刺史诗。

26. Pope was the greatest poet of his time. He strongly advocated neoclassicism, emphasizing that literary works should be judged by classical rules of order, reason, logic, restrained emotion, good taste and decorum. 蒲伯是当时最伟大的诗人,他大力提倡新古典主义,强调文学作品的优劣应由古典的秩序尺度,理性,逻辑,情感的克制,高雅的品位以及是否体面,正派来衡量。

27. He worked painstakingly on his poems, developed a satiric, concise, smooth, graceful and well-balanced style.他致力于诗歌创作,发展了讽刺,简练,通顺,优雅,平衡的风格。

(III)Daniel Defoe丹尼尔.

28. His quick mind, abundant energy and never-failing enthusiasm always brought him back on his feet after a fall.他过人的才智,充沛的精力,旺盛而持久的热情总是使他在失败后能重新站起。

29. Robinson Crusoe, an adventure story very much in the spirit of the time, is universally considered his masterpiece.《鲁宾逊漂流记》是一部体现时代精神的游记历险小说,是笛福的代表作。

30. In most of his works, he gave his praise to the hard-working, study middle class and showed his sympathy for the downtrodden, unfortunate poor.在他大部分作品中,他都表达了对勤劳,坚强的中产阶级的赞誉,以及对破落不幸的穷苦人的同情。

31. Defoe was a very good story-teller.笛福很会讲故事。

32. His sentences are sometimes short, crisp and plain, and sometimes long and rambling, which leave on the reader an impression of casual narration.他的语句时而短小干脆,朴素直白,时而又气势磅礴,泼墨如水,为读者留下了叙述自由悠闲的印象。

33. His language is smooth, easy, colloquial and mostly vernacular.他的措辞简朴易懂又口语化,有时甚至是俗语方言。

34. There is nothing artificial in his language: it is common English at its beat.他的语言毫无造作,完全是大众英语。

35. Robinson Crusoe: The novel consists actually of three parts. 《鲁宾逊漂流记》:整部小说分为三个部分

The realistic account of the successful struggle of Robinson single-handedly against the hostile nature forms the best part of the novel. Robinson is here a real hero: a typical eighteenth-century English middle-class man., the pioneer colonist.其中对鲁宾逊徒手与恶劣的大自然作斗争的描述是小说最精彩的部分。在此,鲁宾逊是真正的英雄:一个典型的英国十八世纪中产阶级人士。

(IV)Jonathan Swift乔纳森.斯威夫特

36. In 1704 he published two powerful satires on corruption in religion and learning,

A Tale of a Tub and The Battle of the Books, which established his name as a satirist.1704年,他针对宗教和学术界的腐败出版了两篇犀利的讽刺小品,一为《桶的故事》,一为《书籍的战斗》。这两篇作品奠定了他在讽刺作品中的地位。

37. Even today Swift is still respected as a national hero in Ireland.直至今日,斯威夫特还被尊为爱尔兰的民族英雄。

38. In his opinion, human nature is seriously and permanently flawed. To better human life, enlightenment is needed.他认为人性永远有着严重的瑕疵,为了使人的生活更美好,人们需要启蒙。

39. In his writings, although he intends not to condemn but to reform and improve human nature and human institutions.在他的作品中,他提倡的不是谴责,而是采取行为改良人性与人为的机构。

40. His “A Modest Proposal ” is generally taken as a perfect model.他的《一个温和的建议》被认为是一篇完善的典范。

41. Swift is one of the greatest masters of English prose.斯威夫特是一名优秀的散文作家。

42. He defined a good style as “proper words in proper places.” Clear, simple, concrete diction, uncomplicated sentence structure, economy and conciseness of language mark all his writings---essays, poems and novels.他创立了一种良好的文风,即“在恰当的地方用恰当的词”。无论是散文,诗歌,还是小说,简洁,具体,精确,没有复杂的句式永远是他的写作风格。

43. Swift’s chief works are: A Tale of a Tub and The Battle of the Books, The Drapier’s Letters(note:Drapier=Swift, alias), Gulliver’s Travels and A Modest Proposal.斯威夫特的作品主要有《桶的故事》,《书籍的战斗》,《德拉皮尔的信》,《格列佛游记》和《一个温和的建议》。

44. Gulliver’s Travels: Jonathan’s best fictional work, the book contains four parts. Its social significance is great and its exploration into human nature profound. 《格列佛游记》:是斯威夫特最精彩的一部小说,全书分为四卷,它具有重大的社会意义,同时对人性的探索与揭示也是深刻的。

(V)Henry Fielding亨利.费尔丁

45. During his career as a dramatist, Fielding had attempted a considerable number of forms of play.在他戏剧创作生涯里,费尔丁曾尝试过许多不同的戏剧模式。

46. Of all his plays, the best known are The Coffee-House Politician, The Tragedy of Tragedies, Pasquin, and The Historical Register for the Year 1736.他的作品中最有名的要数《咖啡屋的政治家》,《悲剧中的悲剧》,《巴斯昆》,《1736历史年鉴》。

47. a “comic epic in prose,” whose subject is “the true ridiculous” in human nature.“散文体喜剧史诗”,主题是人类本性中的荒唐,对人性进行了真实的讽刺。

48. The dominating qualities of the novel are its excellent character-portrayal, timely entrances and exits, robustness of tone and hilarious, hearty humor.小说的突出特点是出色的人物刻画,及时的出场退场,笔调的遒劲及令人会心的幽默。

49. “The Great Man, properly considered, is no better than a great gangster”----The History of Jonathan Wild the Great从某种意义上说,伟大的人物无异于“伟大”的匪徒--------《伟大的乔纳森怀尔德》。

50. The History of Tom Jones is a masterpiece on the subject of human nature. 费尔丁的代表作《汤姆.琼斯:一个弃儿的故事》主题是对人性的讽刺。

51. the purpose of the novel was not just to amuse, but to instruct, the object of novel was to present a faithful picture of life, “the just copies of human manners,” with sound teaching woven into their texture, so as to teach men to know themselves, their proper-spheres and appropriate manners.,小说不仅供娱乐,而且更有教育意义,他的小说的主旨是要真实地展示生活,使之成为“人类态度的完整拷贝”,并将说教巧妙的引入作品,教导人们认识自己,寻求适宜的人生态度。

52. Fielding has been regarded by some as “Father of the English novel,” for his contribution to the establishment of the form of the modern novel.费尔丁被一些人尊为“英国小说之父”,因为他为现代小说模式的创立作出很大贡献。

53. he was the first to set out , both in theory and practice, to write specifically

a “comic epic in prose,” the first to give the modern novel its structure and style.他第一个在理论与实践上创造了“散文体喜剧史诗”,并第一个为现代小说确立了结构和风格。

54. He “thinks the thought” of all his characters, so he is able to present not only their external behaviors but also the internal workings of their minds.作者以角色的口吻去“想”,因此不仅可以表述人物的外在行为,还可深入刻画其内心的思想活动。

55. Fielding ‘s language is easy, unlaboured and familiar, but extremely vivid and vigorous. His sentences are always distinguished by logic and rhythm, and his structure carefully planed toward an inevitable ending.费尔丁的创作语言自然流畅,通俗易懂,同时又栩栩如生并富有活力,他的句子以逻辑性和韵律性见长,小说结尾总是水到渠成,顺理成章。

56. Tom Jones, the novel consists of 18 books. Tom, the titular hero of the story, he became a national hero, he---honest, kind-hearted, high-spirited, loyal, and brave, but impulsive, wanting prudence and full of animal spirits.《汤姆.琼斯》共18卷,汤姆曾一度成为全国人民心中的英雄,他----诚实,善良,高尚,忠诚,勇敢,同时也有着易冲动,鲁莽和野性难驯的缺点。

57. Tom Jones brings its author the name of the “Prose Home.” The panoramic view it provides of the 18th-century English country.《汤姆.琼斯》为费尔丁赢得了“散文荷马”的盛名,小说为读者提供了一幅英国18世纪乡村与城市的宏伟的全景图。

(VI)Samuel Johnson塞缪尔.约翰逊

58. The years between 1737 and 1755, he did translations, wrote poems, essays and so on.1737年至1755年这段时间对他来说充满了艰辛:他做过翻译,写过诗,为书商编书,编辑杂志。

59. In his famous Literary Club, where he was surrounded with respect by the elite of the literary circles.在他的文学社里,周围围满了敬仰他的文学精英。

60. Johnson was an energetic and versatile writer. He had a hand in all the different branches of literary activities.约翰逊精力充沛,多才多艺,他还涉足各种各样的文学领域。

61. His chief works include pomes: “London”, and “The Vanity of Human Wishes”; a romance: The History of Rasselas, Prince of Abyssinia; a tragedy: Irene.他的主要作品有诗歌:《伦敦》,《人类欲望的虚幻》骑士浪漫诗:《拉塞拉斯的历史》,《阿比西尼亚王子》;一部悲剧:《艾琳》。

62. As a lexicographer, Johnson distinguished himself as the author of the first English dictionary by an Englishman----A Dictionary of the English Language, a gigantic task which Johnson undertook single-handedly and finished in over seven years.作为词典编撰者,约翰逊是编撰英文词典的第一个英国人,作品为《英文大词典》,这部巨著是塞缪尔.约翰逊花了七年时间独自完成的。

63. Johnson was the last great neoclassicist enlightener in the later eighteenth century. He was very much concerned with the theme of the vanity of human wishes.约翰逊是十八世纪下半叶最后一位新古典主义启蒙文学家,他十分关心人类欲望的虚幻,几乎他所有的作品都含有这样的主题。

64. His sentences are long and well structured, interwoven with parallel words and phrases.他使用的句子一般较长,但结构工整,包含有许多排比,对仗。

65. Reading his works gives the reader the impression that he is talking with a very learned man.读他的小说会给人一种感觉,他在与一位非常博学的人士对话。

(VII)Richard Brinsley Sheridan理查.比.谢立丹

66. The year 1777 saw the appearance of his masterpiece The School for Scandal, which brought him quite a fortune.1777年,谢立丹的代表作《造谣学校》出版,使他大发其财。

67. His plays, especially The Rivals and The School for Scandal, are generally regarded as important links between the masterpiece of Shakespeare and those of Bernard Shaw, and as true classics in English comedy.他的代表作《情敌》和《造谣学校》被认为是上承莎士比亚,下接萧伯纳的纽带,是真正的英国古典派喜剧。

68. In his play, morality is the constant theme.他的作品永恒的主题是道德。

69. The School for Scandal is mainly a story about two brothers, the hypocritical Joseph Surface and the good-natured, imprudent, spendthrift Charles Surface. The play ends with great disgrace for Joseph and double bliss for Charles. It is a sharp satire on the moral degeneracy of the aristocratic-bourgeois society in the eighteenth-century England. No wonder, the play has been Regarded as the best comedy since Shakespeare. 《造谣学校》主要讲述了两个兄弟的故事,一个是伪君子约瑟夫.萨尔菲斯,另一个是放荡不羁但心地善良的查尔斯.萨尔菲斯。戏剧的结尾约瑟夫名声扫地,而查尔斯既获得了美人的芳心,又获得了丰厚的遗产,而梯泽尔夫人在丈夫的感化下与其重归于好。《造谣学校》是对18世纪英国贵族资产阶级的道德败坏,对无聊的富人恶意的制造谣言,对上层社会骄奢淫逸的生活以及对在高贵生活方式和高尚道德准则的掩饰下的道德沦丧与虚伪假善的辛辣讽刺。毫无疑问,它被认为是自莎士比亚以来最出色的喜剧。

(VII)Thomas Gray托马斯.格雷

70. he declined the Poet laureateship in 1757.1757年,他竟谢绝了授予他的诗人桂冠奖。

71. In contrast to those professional writers, Gray’s literary output was small.与其余专职作家不同,格雷作品极少。

72. His masterpiece, “Elegy Written in a Country Churchyard” was published in 1751. The poem once and for all established his fame as the leader of the sentimental poetry of the day, especially “the Graveyard School”.1757年,他的代表作《写在教堂墓地的挽歌》出版这首诗奠定了他在当时作为感伤主义诗歌创始人的地位,尤其是从此他便成为“墓地诗歌”流派的代表。

73. His other poems include “Ode on the Spring”, “Ode on the Death of a Favourite cat” and so on. (Ode:….赞,颂)他的其他作品还有《春之颂》,《伊顿公学展望》,《爱猫之死》等等。

74. A conscientious artist of the first rate, Gray wrote slowly and carefully, painstakingly seeking perfection of form and phrase.格雷创作态度认真,作品诞生速度慢,却精益求精。

75. “Elegy Written in a Country Churchyard” is regarded as Gray’s best and most representative work. In this poem, Gray reflects on death, the sorrows of life, and the mysteries of human life with a touch of his personal melancholy. The poem abounds in images and and arouses sentiment in the bosom of every reader, The poem has been ranked among the best of the eighteenth century English poetry.《写在教堂墓地的挽歌》是雷格最优秀的代表作,创作历时八年,诗中内容与格雷的知己理查.韦斯特的去世有关。其中,格雷揭示了生与死的愁苦与神秘,并略述了自己忧伤的心情。诗中富于比喻,并给读者带来深深的伤感。这首诗被列为英国十八世纪最优秀的诗歌之一。

中药化学总结个人

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象为彼此独立的人或事物) Iron is more useful than any other metal. (比较对象具有所属关系, 含有最高级含义) The city is becoming more and more beautiful. superior, inferior , senior , junior , major , minor He is three years senior to me. This type of computer is superior to that type. The Yangtze River is the longest river in China, but it is the third longest river in the world. The youngest member of the family is most successful. Of all forms of energy, electricity is most widely used. There are more wonders in heaven and earth than are dreamt of. ( than=than what…) 天地间的奇迹比人们所梦想的要多得多。 The medicine is more effective than is expected.

中药化学重点总结归纳

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中药有效成分的提取方法(一) (一)溶剂法 1、常用溶剂及性质 石油醚、四氯化碳(Ccl4)、苯(C6H6)、二氯甲烷(CHCL2)、氯仿(CHCl3)、乙醚(Et2O)、乙酸乙酯(EtOAc)、正丁醇(n-BuOH)、丙酮(Me2CO)、乙醇(EtOH或Alc)、甲醇(MeOH)、水等、极性越来越大。 2.中药化学成分的极性 化学物质的极性就是根据介电常数计算的,介电常数越大,极性越大。偶极矩,极化度、介电常数与极性有关。化合物极性大小判断:有机化合物,含C越多,极性越小,含氧越多,极性越大;含氧化合物中,含氧官能团极性越大,化合物的极性越大(含氧 官能团极性羧基>羟基>醛基>酮基>酯基);酸性碱性两性极性与存在状态有关(游离性极性小,解离型极性大)。比较极性(汉防己甲素(甲氧基取代)<汉防己乙素(羟基取代)。 3.溶剂提取法的基本原理——相似相溶原理(提取溶剂的选择) 4.提取方法 溶剂法提取中药成分的常用方法有浸渍法、渗漉法、煎煮法、回流提取法与连续回流提取法5种。其中浸渍法与渗漉法属于冷提法,适用于对热不稳定的成分的提取,但提取效率低于热提法,因此提取时间长、消耗溶剂多。含淀粉、果胶、粘液质等杂质较多的中药提取可选择浸渍法。煎煮法、回流提取法与连续回流提取法属于热提法,提取效率高于浸渍法、渗漉法,但只适用于对热稳定的成分的提取。三法比较,煎煮法只能用水作提取溶剂,回流提取法有机溶剂消耗量较大,连续回流提取法节省溶剂,但提取液受热时间长。 (二)水蒸气蒸馏法能够用水蒸气蒸馏法提取的中药成分必须 满足3个条件,即挥发性、热稳定性与水不溶性(或虽可溶于水,但经盐析后可被与水不相混溶的有机溶剂提出,如麻黄碱)。凡能满足上述3个条件的中药化学成分均可采用此法提取。如挥发油、挥发性生物碱(如麻黄碱、烟碱、槟榔碱等)、小分子的苯醌与萘醌、小分子的游离香豆素、小分子的酚性物质(牡丹酚)等。(三)升华法适用于具有升华性的成分的提取,如游离的醌类成 分(大黄中的游离蒽醌)、小分子的游离香豆素等,以及属于生物碱的咖啡因,属于有机酸的水杨酸、苯甲酸,属于单萜的樟脑等。 (四)超临界流体萃取法特点:没有有机溶剂的残留,产品质量高,无污染,适用于对有热不稳定易氧化成分的提取,萃取速度高,收率高,工艺流程简单,操作简单,成本低,对有效成分的提 取选择性高(通过夹带剂改变或维持选择性),对脂溶性成分提 取效率高(在提取极性较大成分时,可以加入夹带剂),提取设备造价高,节约能源。 (五)其它:组织破碎法、压榨法、超声提取法(提取效率高,不破 坏成分)、微波提取法。 中药有效成分进行分离与精制(二) 一、根据物质溶解度的差别,进行分离与精制 1.结晶法 结晶溶剂选择的一般原则:对欲分离的成分热时溶解度大,冷时溶解度小;对杂质冷热都不溶或冷热都易溶。沸点要适当,不宜过高或过低,如乙醚就不宜用,不与被结晶物质发生反应, 无毒或小毒。 判定结晶纯度的方法:理化性质均一(形态稳定,颜色均一);固体化合物熔距≤2℃,熔点一定;各种色谱都能用,TLC或PC展开呈单一斑点;HPLC或GC分析呈单峰。双熔点:汉防己乙素与汉防己甲素(芫花素)。 2.沉淀法 可通过4条途径形成沉淀改变溶解度实现: 1)通过改变溶剂极性改变成分的溶解度。常见的有水醇法(沉淀多糖蛋白质等水溶性成分)、醇水法(沉淀树脂叶绿素等亲脂性成分)、醇提乙醚或丙酮沉淀法(沉淀皂苷)等。 2)通过改变溶剂强度改变成分的溶解度。使用较多的就是盐析法,即在中药水提液中加入一定量的无机盐,使某些水溶性成分溶解度降低而沉淀出来。 3)通过改变溶剂pH值改变成分的存在状态,解离状态极性变大,非解离状态极性变小。适用于酸性、碱性或两性亲脂性成分的分离。如分离碱性成分的酸提碱沉法与分离酸性成分的碱提酸沉法,调等电点提取两性成分。 4)通过加入某种试剂与欲分离成分生成难溶性的复合物或化合物。如铅盐沉淀法(包括中性醋酸铅或碱式醋酸铅)、雷氏盐沉淀法(分离季胺生物碱)、胆甾醇沉淀法(分离甾体皂苷)、明胶法(沉淀鞣质)等。 二、根据物质在两相溶剂中分配比的差异,对中药有效成分进行分离与精制 1.液-液萃取选择两种相互不能任意混溶的溶剂,通常一种为水,另一种为石油醚、乙醚、氯仿、乙酸乙酯或正丁醇等,这些溶剂要与水分层。将待分离混合物混悬于水中,置分液漏斗中,加适当极性的有机溶剂,振摇后放置,分取有机相或水相,即可 将极性不同的成分分离。分离的难易取决于两种物质在同一溶剂系统中分配系数的比值,即分离因子。分离因子愈大,愈易分离。可以通过调整溶液PH值来分离。

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