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Chapter 21: Q30P (page 1007)

What is the configuration about each of the asymmetric centres in aspartame?

Short Answer

Expert verified

The answer is:

Configuration of Aspartame

Step by step solution

01

Step-by-Step Solution Step 1: Aspartame

Aspartame is an essential artificial sweetener, much sweeter than sugar. It is a compound containing carbon, nitrogen, oxygen, and hydrogen.

02

Explanation

The configuration of the asymmetric centers is shown below.

Configuration of Aspartame

Both the asymmetric centers in the compound is of S configuration.

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Most popular questions from this chapter

What dipeptides would be formed by heating a mixture of valine and N- protected leucine?

What amino acid is formed using the N-phthalimidomalonic ester synthesis when the following alkyl halides are used in the third step?

(a)

(b)CH3SCH2CH2Br

Why are the carboxylic acid groups of the amino acids more acidic

(pKa ~ 2) than a carboxylic acid such as acetic acid (pKa = 4.76)?

After the polypeptide shown below was treated with maleic anhydride, it was hydrolyzed by trypsin. (After a polypeptide is treated with maleic anhydride,

trypsin will cleave the polypeptide only on the C-side of arginine.)

Gly-Ala-Asp-Ala-Leu-Pro-Gly-Ile-Leu-Val-Arg-Asp-Val-Gly-Lys-Val-Glu-Val-Phe-Glu-Ala-Gly-

Arg-Ala-Glu-Phe-Lys-Glu-Pro-Arg-Leu-Val-Met-Lys-Val-Glu-Gly-Arg-Pro-Val-Gly-Ala-Gly-Leu-Trp

a. After a polypeptide is treated with maleic anhydride, why does trypsin no longer cleave it on the C-side of lysine?

b. How many fragments are obtained from the polypeptide?

c. In what order will the fragments be eluted from an anion-exchange column using a buffer of pH = 5?

A professor was preparing a manuscript for publication in which she reported that the pI of the tripeptide Lys-Lys-Lys was 10.6. One of her studentspointed out that there must be an error in her calculations because the pKa of the e-amino group of lysine is 10.8 and the pI of the tripeptide has to begreater than any of its individual pKa values. Was the student correct?
See all solutions

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