Lecture 2

Lecture 2 - Lecture 2 1/7/10 Background reading: Garrett...

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Lecture 2 1/7/10 Background reading: Garrett and Grisham: Chapter 2: Pages 46-49 Chapter 4: Pages 76 - 85 Assignment: Segel: Page 92: problems 25 (parts a-d) and 38 (parts a-d) Page 93: problems 40, 41 and 44 Memorize structures and one letter codes of the 20 amino acids. (Note: For your information, the Tris buffer that is used in Problem 41 in the above assignment is an amine. The two components of this buffer can be considered as RNH 3 + and RNH 2 .) Outline: Polyprotic acids Amino acids – general properties Common amino acids found in proteins Amino acids with nonpolar aliphatic R groups Amino acids with polar uncharged R groups Amino acids with aromatic R groups Amino acids with positively charged R groups Amino acids with negatively charged R groups
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± Polyprotic acids Acids capable of ionizing to form more than one proton per molecule of acid. K a1 K a2 H + + A = H + + HA - H 2 A Amphoteric ion - t he intermediate ion, HA - can ionize backward or forward. pK a1 pK a2 If have an intermediate ion, the pH = pK a1 + pK a2 2 pH (See Segel: pages 52-56 for derivation of this equation.) OH -
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H 3 PO 4 is a common polyprotic acid.
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This note was uploaded on 06/23/2010 for the course BIS 102 taught by Professor Hilt during the Winter '08 term at UC Davis.

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Lecture 2 - Lecture 2 1/7/10 Background reading: Garrett...

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