Development and characterization of spray-dried chia oil microcapsules using by-products from chia as wall material

Abstract

This research deals with the characteristics of spray-driedchia oil microcapsules formulated with different wall materials,including new encapsulant agents from chia seed (protein rich fraction,PRF; chia mucilage, Muc). The performance of six different wall materialscombinations was studied: sodium caseinate and lactose (NaCas+L), NaCasand maltodextrin (NaCas+Mx), PRF and Mx (PRF+Mx), and each of theprevious three with the addition of Muc. The particle size, rheology, andstability of the parent emulsions were analyzed. The characterization ofthe powders obtained by spray-drying the parent emulsions was carried outby their moisture content, water activity, microencapsulation efficiency,glass transition temperature, morphology, oxidative stability, anddispersibility. Emulsions were reconstituted from the powders atdifferent storage times and analyzed by their particle size andstability. The encapsulation efficiencies were NaCas+L+Muc(96.23±0.40%)~NaCas+L (95.20±0.42%) >NaCas+Mx+Muc (86.65±0.27%)>NaCas+Mx(71.26±0.06%)>PRF+Mx (57.74±3.49%)~ PRF+Mx+Muc (53.37±0.99%). Theaddition of Muc significantly improved the ME% in microcapsules withNaCas+Mx. The induction time values (ti) of NaCas+L, PRF+Mx and NaCas+Mxsystems were about two, three, and five times higher than that of chiabulk oil, respectively. Thus, the studied wall materials were efficientto protect chia seed oil against the oxidation process.