Blueberry Residue Encapsulation by Ionotropic Gelation

Area of Science:

• Food Science
• Materials Science
• Biochemistry

Background:

• Fruit processing, particularly blueberries (Vaccinium sp.), generates significant organic waste laden with valuable phenolic compounds.
• Environmental concerns and the potential for bioactive compound recovery necessitate innovative waste valorization strategies.
• Encapsulation offers a method to protect and utilize these compounds, with ionotropic gelation being a cost-effective technique.

Purpose of the Study:

• To evaluate sodium alginate as a wall material for encapsulating blueberry residue using ionotropic gelation.
• To characterize the resulting microbeads and assess the retention and release of phenolic compounds.
• To determine the suitability of the developed matrix for preserving bioactive components from fruit waste.

Main Methods:

• Ionotropic gelation was employed to create sodium alginate microbeads encapsulating blueberry residue.
• Characterization included scanning electron microscopy (SEM) for morphology and X-ray diffraction (XRD) for structural analysis.
• Quantification of total phenolic compounds, antioxidant capacity assays, and in vitro dissolution studies were performed.

Main Results:

• Microbeads exhibited surface invaginations, indicating successful encapsulation.
• A significant retention of 67.01% of total phenolic compounds was achieved post-encapsulation.
• In vitro dissolution demonstrated a release of 68.2% of phenolic compounds over 120 minutes.

Conclusions:

• Sodium alginate is a suitable matrix for encapsulating bioactive compounds from blueberry residue via ionotropic gelation.
• The encapsulation process effectively preserved phenolic compounds, with controlled release characteristics.
• These microbeads represent a promising approach for the valorization of fruit processing waste in food products.