Spray-dried Encapsulation of Roselle (Hibiscus Sabdariffa) and Evaluation of Their Potential as Rich-antioxidant Compound
Authors:   Lab of Tissue Engineering and Regenerative Medicine, School of Biomedical Engineering, International University, Ho Chi Minh City, Vietnam, Vo Minh Quan ,   Vietnam National University in Ho Chi Minh City, Ho Chi Minh City, Vietnam, Le Chi Kim-Thi ,   Lab of Tissue Engineering and Regenerative Medicine, School of Biomedical Engineering, International University, Ho Chi Minh City, Vietnam; Vietnam National University in Ho Chi Minh City, Ho Chi Minh City, Vietnam, Ngo My-Duyen ,   Lab of Tissue Engineering and Regenerative Medicine, School of Biomedical Engineering, International University, Ho Chi Minh City, Vietnam; Vietnam National University in Ho Chi Minh City, Ho Chi Minh City, Vietnam, Lam Trung-Tuan Nguyen ,   Lab of Tissue Engineering and Regenerative Medicine, School of Biomedical Engineering, International University, Ho Chi Minh City, Vietnam; Vietnam National University in Ho Chi Minh City, Ho Chi Minh City, Vietnam, Nguyen Kieu Thi-Thuy ,   Lab of Tissue Engineering and Regenerative Medicine, School of Biomedical Engineering, International University, Ho Chi Minh City, Vietnam; Vietnam National University in Ho Chi Minh City, Ho Chi Minh City, Vietnam, Phan Thi Thanh Tam ,   Lab of Tissue Engineering and Regenerative Medicine, School of Biomedical Engineering, International University, Ho Chi Minh City, Vietnam; Vietnam National University in Ho Chi Minh City, Ho Chi Minh City, Vietnam, Dang Thao Nhi Ngoc ,   Lab of Tissue Engineering and Regenerative Medicine, School of Biomedical Engineering, International University, Ho Chi Minh City, Vietnam; Vietnam National University in Ho Chi Minh City, Ho Chi Minh City, Vietnam, Doan Hoan Ngoc ,   Lab of Tissue Engineering and Regenerative Medicine, School of Biomedical Engineering, International University, Ho Chi Minh City, Vietnam; Vietnam National University in Ho Chi Minh City, Ho Chi Minh City, Vietnam, Nguyen Hiep T ,   Lab of Tissue Engineering and Regenerative Medicine, School of Biomedical Engineering, International University, Ho Chi Minh City, Vietnam; Vietnam National University in Ho Chi Minh City, Ho Chi Minh City, Vietnam
Published: February 2025

There is a growing demand using rich-antioxidant compounds from plant extract to develop functional food products or biomedical products. In this work, we studied the impact of producing encapsulated roselle extracts with 1% w/v microencapsulated carrier as a powder rich in antioxidant properties. In particular, the roselle extract was subjected to spray drying using an acidified solution as a solvent. Combinations between maltodextrin and xanthan gum as wall materials were first tried for the roselle. Characterization of the spray-drying powder was confirmed by scanning electron microscopy (SEM), titratable acidity, anthocyanin content, and antibacterial and antioxidant activities. The results showed the addition of xanthan gum directly affects the morphology and antioxidant activities of the encapsulated materials. The particles presented a spherical shape with diameters ranging from 3 – 5 µm. The reduction of antioxidant activities and solubility were observed following the increasing concentration of xanthan gum. Thus, findings in this study have demonstrated that the obtained roselle spray drying powders can possibly be used as rich-antioxidant supplements for food, biomedical, and cosmetic industries.