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Sweet tea extract encapsulated by different wall material combinations with improved physicochemical properties and
Qingyue Deng1, Lishu Han1, Chengjiang Tang1
1College of Light Industry and Food Engineering, Guangxi University, Nanning, China.
Journal of Microencapsulation
|May 28, 2024
Summary
Spray-drying created sweet tea extract microcapsules (STEMs) using maltodextrin, inulin, and gum arabic. Encapsulation enhanced the sweet tea extract's properties and stability, showing potential for its valorization.
Area of Science:
- Food Science and Technology
- Biotechnology
- Materials Science
Background:
- Sweet tea extract (STE) possesses valuable bioactive compounds but can degrade easily.
- Encapsulation techniques are explored to improve the stability and bioavailability of plant extracts.
- Spray-drying is a common method for microencapsulation of sensitive food ingredients.
Purpose of the Study:
- To develop sweet tea extract microcapsules (STEMs) using spray-drying.
- To evaluate the impact of different wall materials (maltodextrin, inulin, gum arabic) on STEM properties.
- To assess the stability and bioactivity of encapsulated STE during in vitro digestion.
Main Methods:
- Microencapsulation of STE using spray-drying with varying ratios of maltodextrin (MD), inulin (IN), and gum arabic (GA).
- Characterization of microcapsules including yield, encapsulation efficiency (EE), particle size, morphology, and FTIR analysis.
- In vitro digestion studies to evaluate the stability of bioactive components and enzyme inhibitory activities (α-glucosidase, α-amylase, ACE) and antioxidant capacity.
Main Results:
- The formulation MD5IN5 yielded the highest yield (56.33%) and encapsulation efficiency (88.84% for total flavonoids).
- The formulation MD9GA1 produced the smallest particle size (642.13 nm) and demonstrated superior retention of bioactive components.
- MD9GA1 exhibited significant inhibition of α-glucosidase (96.85%), α-amylase (57.58%), and ACE (56.88%), along with enhanced antioxidant activity post-digestion.
Conclusions:
- Spray-drying encapsulation effectively improves the physicochemical properties and bioactivity stability of sweet tea extract.
- Specific wall material combinations, like MD9GA1, are optimal for achieving desired characteristics such as small particle size and high bioactivity retention.
- Encapsulation offers a viable strategy for the valorization of sweet tea extract, enhancing its potential applications.
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