Biochemistry
6th Edition
ISBN: 9781305577206
Author: Reginald H. Garrett, Charles M. Grisham
Publisher: Cengage Learning
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Chapter 25, Problem 13P
Interpretation Introduction
Interpretation:
To determine the Aspartame structure in Merck Index and to reason out why this substance should be avoided by people with phenylketonuria
Concept Introduction:
Aspartame, the artificial sweetener used in place of sugar in some of the foods and beverages is methyl ester of phenylalanine dipeptide/aspartic acid.
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identify the amino acid described. state the name, one-letter abbreviation, and draw the structure at pH 12.0
a non-polar essential amino acid capable of donating 1 carbon moiety in metabolism
TABLE 3-1 Properties and Conventions Associated with the Amino Acids
pk, values
Amino acid
Phenylalanine
Tyrosine
Tryptophan
5.66
5.48
9.59
5.89
Abbreviation/
symbol
6.14
Phe F
Tyr Y
Trp W
pk,
M, (-COOH)
165
181
204
.
1.83
2.20
2.38
Using the table 3-1, calculate the pl of Tyrosine.
Hint: Consider the structure and overall charge of the molecule between each pka.
pK₂2
(-NH)
9.13
9.11
9.39
PKR
(R group)
10.07
None
Chapter 25 Solutions
Biochemistry
Ch. 25 - Prob. 1PCh. 25 - Prob. 2PCh. 25 - Regulation of Glutamine Synthetase by Covalent...Ch. 25 - The Energetic Cost of Nitrogen Excretion via the...Ch. 25 - Prob. 5PCh. 25 - Prob. 6PCh. 25 - Prob. 7PCh. 25 - Prob. 8PCh. 25 - Prob. 9PCh. 25 - Prob. 10P
Ch. 25 - Prob. 11PCh. 25 - Prob. 12PCh. 25 - Prob. 13PCh. 25 - Prob. 14PCh. 25 - Prob. 15PCh. 25 - A Deficiency on 3-Phosphogtycerate Dehydrogenase...Ch. 25 - Prob. 17PCh. 25 - Prob. 18PCh. 25 - Prob. 19PCh. 25 - Consider the synthesis and degradation of tyrosine...Ch. 25 - Prob. 21PCh. 25 - Prob. 22P
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