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As partune, an artifical sweetener, is a...

As partune, an artifical sweetener, is a peptide and has the following structure:

(i) Identify the four functional groups.
(ii) Write the zwitterionic structure.
(iii) Write the structure of amino acids obtained from the hydrolysis of aspartame.
(iv) Which of the two amino acids is more hydrophobic?

Text Solution

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i. Four fuctional groups are:
a. Amine group `(-NH_(2))`.
b. Carboxylic acid group `(-COOH)`.
c. Amide group `(-overset(O)overset(||)(C )-NH-) (2^(@) "amide") ("perptide bond")`
d. Ester group `(COOCH_(3))`.
Zwitterion structure:
iii.
iv. `(B)` is more hydrophobic (less soluble in `H_(2)O`), due to large non-polar part mentioned in the dotted box.
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