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Published on: September 6, 2012
Stabilization of anthocyanins by simultaneous encapsulation-copigmentation via protein-polysaccharide polyelectrolyte
Chen Tan1, Yan Sun1, Xueqing Yao1
1China-Canada Joint Lab of Food Nutrition and Health, School of Food and Health, Beijing Engineering and Technology Research Center of Food Additives, Beijing Technology & Business University (BTBU), Beijing 100048, China.
This study developed novel polyelectrolyte complexes (PECs) using heated whey protein isolate and polysaccharides to stabilize anthocyanins (ATC). These complexes effectively protected anthocyanins from degradation, offering a promising food stabilization solution.
Area of Science:
- Food Science and Technology
- Biomaterials Science
- Colloid and Interface Science
Background:
- Anthocyanins (ATC) are valuable natural pigments prone to degradation.
- Stabilization of anthocyanins is crucial for their application in food and beverages.
- Whey protein isolate (WPI) and polysaccharides are biocompatible materials for encapsulation.
Purpose of the Study:
- To prepare and characterize polyelectrolyte complexes (PECs) of heated whey protein isolate (HWPI) and various polysaccharides.
- To evaluate the simultaneous encapsulation, copigmentation, and stabilization of anthocyanins (ATC) within these PECs.
- To investigate the interactions governing the stability of anthocyanin-loaded PECs.
Main Methods:
- Formation of PECs by mixing HWPI and four polysaccharides (chondroitin sulfate, dextran sulfate, gum arabic, pectin) at pH 4.0.
- Characterization of PECs including particle size, encapsulation efficiency, and production yield.
- Assessment of ATC stability under various stress conditions (storage, neutral pH, ascorbic acid, heat).
Main Results:
- PECs exhibited particle sizes of 120-360 nm with encapsulation efficiencies of 62-80% and yields of 47-68%.
- All PECs effectively inhibited ATC degradation during storage and under stress conditions.
- Pectin-based PECs provided the best protection for anthocyanins, followed by gum arabic, chondroitin sulfate, and dextran sulfate.
- Stabilization was attributed to hydrogen bonding, hydrophobic, and electrostatic interactions within the PECs.
Conclusions:
- HWPI-polysaccharide PECs are effective systems for simultaneous anthocyanin encapsulation, copigmentation, and stabilization.
- The choice of polysaccharide significantly influences the protective capacity of the PECs.
- The developed PECs offer a viable strategy for enhancing the stability of anthocyanins in various applications.
