How to draw titration of amino acids ？what happen when ph increase from low to high？ 1. what does it means when pka and ph are equal？ 2. Did I calculate p1 correctly？？ 3. Does cysteine lose H in SH ？should it be positively charged or negatively charged after lose H and why？？
How to draw titration of amino acids ？what happen when ph increase from low to high？ 1. what does it means when pka and ph are equal？ 2. Did I calculate p1 correctly？？ 3. Does cysteine lose H in SH ？should it be positively charged or negatively charged after lose H and why？？
Biochemistry
6th Edition
ISBN:9781305577206
Author:Reginald H. Garrett, Charles M. Grisham
Publisher:Reginald H. Garrett, Charles M. Grisham
Chapter25: Nitrogen Acquisition And Amino Acid Metabolism
Section: Chapter Questions
Problem 9P
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How to draw titration of amino acids ？what happen when ph increase from low to high？
1. what does it means when pka and ph are equal？
2. Did I calculate p1 correctly？？
3. Does cysteine lose H in SH ？should it be positively charged or negatively charged after lose H and why？？
Transcribed Image Text:Histidine.
аон
H₂N²-C - H
CH₂
|| M
\N//
+ H
Co
Coo
+1
H ~ H³N² C-H = H₂N-C-H ~ H₂N-C-H
PK9=PH=1.82 CH² Pha=PH=6.0 CH² PRAZPH=9.17 07/1₂
en
IMH
M
\N/
+H
(1+)
(2+)
cysteine
cos
аон
1
NH÷-C-H ~ M÷-C-H
GCH2
1
SH
(+1)
P₁ =
CH2
हम
(0)
Pra-PH=1-711
P₁ =
\N/
+H
(0)
6.0+ 9.7
2
2
1.71+8.33
كيف
CH₂
SH
(-1)
= 15.17
2
N/
(-1)
=NH₂=C-H = H₂C-H
CH₂
Pha-PH=8.331 Pha=PH= 10.78
7.585,
S
e
er
n
t
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