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

US MEDINA, ULIL; JULIO, LUCIANA M.; SEGURA CAMPOS, MAIRA; IXTAINA, VANESA Y.; TOMÁS, MABEL C.

POWDER TECHNOLOGY

ELSEVIER SCIENCE SA

Lugar: Amsterdam; Año: 2018

0032-5910

This research deals with the characteristics of spray-dried chia 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 materials combinations was studied: sodium caseinate and lactose (NaCas+L), NaCas and maltodextrin (NaCas+Mx), PRF and Mx (PRF+Mx), and each of the previous three with the addition of Muc. The particle size, rheology, and stability of the parent emulsions were analyzed. The characterization of the powders obtained by spray-drying the parent emulsions was carried out by their moisture content, water activity, microencapsulation efficiency, glass transition temperature, morphology, oxidative stability, and dispersibility. Emulsions were reconstituted from the powders at different storage times and analyzed by their particle size and stability. 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%). The addition of Muc significantly improved the ME% in microcapsules with NaCas+Mx. The induction time values (ti) of NaCas+L, PRF+Mx and NaCas+Mx systems were about two, three, and five times higher than that of chia bulk oil, respectively. Thus, the studied wall materials were efficient to protect chia seed oil against the oxidation process.