Phosphorous-containing analogues of aspartame

Area of Science:

• Biochemistry
• Organic Chemistry
• Food Science

Background:

• Aspartame (aspartyl-phenylalanine methyl ester) is a widely used artificial sweetener, over 100 times sweeter than sucrose.
• Phosphonate analogues of amino acids and peptides have shown potential as enzyme inhibitors.
• Understanding structure-activity relationships is crucial for designing novel sweetening agents and enzyme inhibitors.

Purpose of the Study:

• To synthesize and evaluate the sweetening properties of aspartame analogues where a carboxylate group is replaced by a phosphonate group.
• To investigate the impact of phosphonate substitution on the taste profile of aspartame.
• To compare the properties of these phosphonate analogues with previously reported phosphonate peptide analogues.

Main Methods:

• Chemical synthesis of four aspartame analogues.
• Structural characterization of the synthesized compounds.
• Sensory evaluation (taste testing) of the analogues compared to aspartame and sucrose.

Main Results:

• None of the four synthesized phosphonate analogues of aspartame exhibited any sweetness.
• The parent compound, aspartame, demonstrated its characteristic intense sweetness.
• The lack of sweetness in the phosphonate analogues contrasts with their potential for enzyme inhibition.

Conclusions:

• Replacing a carboxylate group with a phosphonate group in aspartame significantly abolishes its sweet taste.
• The structural modifications required for enzyme inhibition may not be compatible with sweet taste perception.
• Further research is needed to elucidate the specific molecular interactions responsible for aspartame's sweetness.