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松江二中欢迎您

松江二中欢迎您. 氨基酸 ( amino acid ). 一、氨基酸的结构. 官能团:. - NH 2 (氨基). - COOH ( 羧基). R - CH - COOH. -. NH 2. ↑ α- 氢原子. α- 氨基酸 :. 二、氨基酸的性质. 物理性质: 晶体,易溶于水,难溶于 乙醚等有机溶剂,熔点较高。. 官能团:. 碱性基团:- NH 2. 酸性基团:- COOH. 请以 α- 氨基酸通式 为例,写出它与盐酸溶液和氢氧化钠溶液反应的化学方程式。. 化学性质:. 1 、两性:.

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松江二中欢迎您

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  1. 松江二中欢迎您

  2. 氨基酸(amino acid)

  3. 一、氨基酸的结构 官能团: -NH2(氨基) -COOH(羧基)

  4. R- CH-COOH - NH2 ↑ α- 氢原子 α-氨基酸:

  5. 二、氨基酸的性质 物理性质: 晶体,易溶于水,难溶于 乙醚等有机溶剂,熔点较高。

  6. 官能团: 碱性基团:-NH2 酸性基团:-COOH

  7. 请以α-氨基酸通式为例,写出它与盐酸溶液和氢氧化钠溶液反应的化学方程式。请以α-氨基酸通式为例,写出它与盐酸溶液和氢氧化钠溶液反应的化学方程式。

  8. 化学性质: 1、两性: (1)与碱溶液反应: (2)与酸溶液反应:

  9. 思考? 氨基酸水溶液酸碱性情况如何?理由是什么?

  10. NH2- CH2-COOH 思考? 请以甘氨酸为例,思考甘氨酸分子间能发生怎样的反应?

  11. NH2- CH2-COOH NH2-CH2-C-OH NH2-CH2-C-OH = = O O NH2-CH2-C- NH-CH2-C-OH = = O O 2、缩合反应 -OH H-NH- + +H2O 肽键

  12. 3、缩聚反应 H2O H2O H2O 多肽 聚甘氨酸(高分子化合物)

  13. 蛋白质结构模型

  14. 作业: 巩固练习

  15. 谢谢

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