Microencapsulation of roasted coffee oil Pickering emulsions using spray- and freeze-drying: physical, structural and in vitro bioaccessibility studies

Author(s)

Ribeiro, Elisa Franco ^{[1, 2]} ; Polachini, Tiago Carregari ^[1] ; Alvim, Izabela Dutra ^[3] ; Quiles, Amparo ^[2] ; Hernando, Isabel ^[2] ; Nicoletti, Vania Regina ^[1]

Affiliation

^[1] Sao Paulo State Univ Unesp, Inst Biosci IIuman & Exact Sci Ibilce, Campus Sao Jose do Rio Preto, BR-15054000 Sao Jose Do Rio Preto, SP - Brazil

^[2] Univ Politecn Valencia UPV, Food Microstruct & Chem Res Grp Univ, Valencia 46022 - Spain

^[3] Food Technol Inst ITAL, Cereal & Chocolate Technol Ctr, BR-13070178 Campinas, SP - Brazil

• Document type: Journal article
• Source: INTERNATIONAL JOURNAL OF FOOD SCIENCE AND TECHNOLOGY; v. 57, n. 1, SI OCT 2021.
• Web of Science Citations: 0

Abstract

Microcapsules produced from well-defined emulsion templates are an interesting alternative for lipid encapsulation. This work aimed to produce microcapsules by the freeze-drying (FD) and spray-drying (SD) of Pickering emulsions of roasted coffee oil (RCO) stabilised with chitosan nanoparticles produced by self-aggregation or by crosslinking with tripolyphosphate. The dried microcapsules were characterised in terms of particle size, oil retention and structure; furthermore, the in vitro bioaccessibility of polyphenols from microencapsulated RCO was investigated. The use of chitosan nanoparticles to stabilise the emulsions increased oil retention in the microcapsules giving values between 83.04% and 95.36%. SD produced spherical microcapsules with small particle sizes (similar to 11 mu m), whereas FD microcapsules showed an irregular shape and porous structure. Although FD had the lowest impact on the bioactive compounds, SD promoted better protection for phenolic compounds and antioxidant activity during in vitro digestion. (AU)

• FAPESP's process: 16/22727-8 - Production and characterization of Pickering emulsions applied to microencapsulation of lipophilic bioactives
• Grantee: Vânia Regina Nicoletti Telis
• Support Opportunities: Regular Research Grants