Which of the following artifical sweeteners is methyl ester of dipeptide ?

Options

A. Aspartame
B. Sucralose
C. Saccharin
D. Alitane

Answer

To determine which artificial sweetener is the methyl ester of a dipeptide, we can follow these steps:

### Step 1: Understand what a dipeptide is
A dipeptide is a molecule formed by the linkage of two amino acids through a peptide bond. In this case, we are looking for a dipeptide that has a methyl ester functional group.

**Hint:** Recall that a methyl ester is formed when the hydroxyl group (-OH) of a carboxylic acid is replaced by a methoxy group (-OCH3).

### Step 2: Identify common artificial sweeteners
Some common artificial sweeteners include:
- Aspartame
- Saccharin
- Sucralose
- Acesulfame K

**Hint:** Familiarize yourself with the structures and compositions of these sweeteners to find the one that fits the criteria.

### Step 3: Analyze Aspartame
Aspartame is known to be a dipeptide composed of two amino acids: aspartic acid and phenylalanine. It is also a methyl ester, as it contains a methoxy group (-OCH3) attached to one of its carboxylic acid groups.

**Hint:** Look for the components of aspartame: it consists of aspartic acid and phenylalanine, which together form the dipeptide.

### Step 4: Confirm the structure of Aspartame
The structure of aspartame can be broken down into:
- Aspartic acid (C4H7NO4)
- Phenylalanine (C9H11NO2)

When these two amino acids combine, the resulting structure has a methyl ester functional group, confirming that it is indeed a methyl ester of a dipeptide.

**Hint:** Draw the structure of aspartame to visualize how the two amino acids are linked and where the methyl ester is located.

### Step 5: Conclusion
After analyzing the structures and compositions, we can conclude that the artificial sweetener that is the methyl ester of a dipeptide is **Aspartame**.

**Final Answer:** Aspartame is the methyl ester of the dipeptide formed from aspartic acid and phenylalanine.