Microencapsulation of green tea polyphenols by ionic gelation and spray chilling methods

Area of Science:

• Food Science
• Material Science
• Nutraceuticals

Background:

• Growing consumer interest in tea's health benefits drives demand for functional food ingredients.
• Tea extracts, rich in polyphenols, offer significant health advantages.
• Developing methods to incorporate these extracts into food products is crucial for the food industry.

Purpose of the Study:

• To encapsulate green tea extract powder into lipid microparticles (LMP) and ionic gelation microparticles (IGMP).
• To obtain polyphenol-rich, water-insoluble components from green tea extract.
• To evaluate the efficiency and antioxidant activity of the microencapsulated green tea extract.

Main Methods:

• Spray chilling method for creating lipid microparticles (LMP).
• Ionic gelation method for creating ionic gelation microparticles (IGMP).
• Characterization of microparticle physical properties and antioxidant activity (IC50).

Main Results:

• Both spray chilling and ionic gelation successfully produced microparticles.
• Encapsulation efficiency was 83.5% for LMP and 72.6% for IGMP.
• LMP exhibited higher antioxidant activity (IC50: 2099.7 μg/mL) compared to IGMP (IC50: 33,169.4 μg/mL).

Conclusions:

• Microencapsulation using both spray chilling and ionic gelation is effective for green tea extract.
• The resulting microparticles are suitable for use as ingredients to add polyphenols to foods.
• Lipid microparticles demonstrated superior antioxidant capacity, suggesting potential for enhanced functional food development.