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Chapter 21: Q53P (page 1027)

Aspartame (its structure is on page 1007) has a pI of 5.9. Draw its prevailing form at physiological pH (7.4).

Short Answer

Expert verified

Structure of aspartame at =7.4 is shown below:


Structure of aspartame at =7.4

Step by step solution

01

Relation between pH and pI value 

Isoelectric point of an amino acid can be seen in structures that contain both positive and negative charges.AMolecule having both positive and a negative charge in its structure is characterized as a zwitterion. Amino acid exists in deprotonated form athigher than pI value.On the other hand, amino acid exists as a protonated form while ph less than pI.

02

Possible structure of aspartame at pH =7.4

Structure of aspartame at =7.4

Thus, the prevailing structure of aspartame at =4 is drawn.

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