Aspartame, an artificial sweetener, is a peptide and has the following structure : 
(i) Identify the four functional groups
(ii) Write the zwitter ionic structure
(iii) Write the structures of the amino acids obtained from the hydrolysis of aspartame.
(iv) Which of these two amino acids, is more hydrophobic ?
Text Solution
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(i) In aspartame four functional groups are present which are
–NH 2 (Amine) (–COOH) (Carboxylic acid)
(ii) Zwitter ion structure is givens as below :
(iii) 
+ 
Hence on hydrolysis two amino acid and are obtained.
(iv) In above two amino acids 
is more hydrophobic due to presence of non-polar
C 6 H 5 –CH 2 – or benzyl group.
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