Delayed volatile compound release properties of self-assembly structures in emulsions

Area of Science:

• Food science and technology
• Colloid and surface chemistry
• Sensory science

Background:

• Controlling aroma release is crucial for the palatability of reduced-fat foods.
• Conventional oil-in-water emulsions often lead to rapid aroma loss.
• Structured emulsions offer a novel approach to modulate flavor perception.

Purpose of the Study:

• To investigate the temporal release and retention of aroma compounds from structured emulsions versus conventional oil-in-water emulsions.
• To compare the impact of self-assembly structures on aroma release dynamics.
• To explore potential applications in modulating flavor profiles of low-fat food products.

Main Methods:

• In vitro dynamic headspace analysis using proton-transfer reaction mass spectrometry (PTR-MS).
• Static headspace analysis employing gas chromatography-mass spectrometry (GC-MS).
• Comparison of aroma release from 5% lipid structured emulsions and 5% or 10% lipid conventional emulsions.

Main Results:

• Structured emulsions demonstrated delayed release of both amphiphilic and lipophilic aroma compounds under dynamic conditions.
• The time to maximum concentration (Tmax) for aroma compounds increased significantly in structured emulsions.
• Structured emulsions exhibited enhanced retention of lipophilic aroma compounds under static conditions compared to conventional emulsions.

Conclusions:

• Self-assembly structures, formed by unsaturated monoglycerides, effectively modulate aroma release and retention.
• Structured emulsions can mimic the aroma release profiles of higher-fat conventional emulsions.
• This technology offers promising strategies for developing palatable reduced-fat foods with controlled sensory attributes.