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Echium oil with oxidative stability increased by emulsion preparation in the presence of the phenolic compound sinapic acid followed by dehydration by spray and freeze drying processes

Author:
Comunian, Talita A., Favaro, Luísa F., Thomazini, Marcelo, Pallone, Eliria M. J. A., do Amaral Sobral, Paulo José, de Castro, Inar Alves, Favaro-Trindade, Carmen S.
Source:
Journal of food science and technology 2019 v.56 no.3 pp. 1155-1164
ISSN:
0022-1155
Subject:
Echium, X-ray diffraction, emulsifiers, emulsifying, emulsions, encapsulation, freeze drying, gum arabic, hygroscopicity, microscopy, oils, oxidation, oxidative stability, particle size, sinapic acid, solubility, spray drying, thermogravimetry, water activity
Abstract:
Echium oil is rich in omega-3, however, is unstable. The objective of this work was the co-encapsulation of echium oil and sinapic acid (SA) by emulsification using Arabic gum as emulsifier/carrier, followed by spray or freeze-drying. Eight treatments (S0, S200, S600 and S1000: particles spray dried with different concentrations of SA; L0, L200, L600 and L1000: particles freeze dried with different concentrations of SA) were analyzed in relation to microscopy, water activity (Aw), hygroscopicity, moisture, solubility, particle size, X-ray diffraction, thermogravimetry and accelerated oxidation. Particles of rounded shape and undefined form were obtained by spray and freeze-drying, besides ideal physicochemical properties for application (values from 0.091 to 0.365, 3.22 to 4.89%, 57 to 68% and 2.32 to 12.42 µm for Aw, moisture, solubility and particle size, respectively). All treatments protected the oil against oxidation, obtaining induction time of 5.31 h for oil and from 7.88 to 12.94 h for treatments. The better protection to oil was obtained with it emulsified and freeze-dried (L600); the encapsulation increased oxidative stability of the oil, besides facilitating its application over the fact the material is in powder form.
Agid:
6332491