Abstract
The aim of the study was to prove the usefulness of microencapsulation of Camelina sativa oil regarding its vulnerability to oxidation caused by oxygen, temperature, and other factors. Pectin, inulin, gum arabic, and β-glucan, each of them mixed with maltodextrin, were used as wall materials and their appropriability to reduce oxidation of the core material was examined. Microcapsules were prepared by spray drying, which is the most commonly used and very effective method. The research confirmed results known from literature, that gum arabic and inulin are most proper wall materials, because they ensure small oxidation increase during storage (4.59 and 5.92 eq/kg after seven days respectively) and also provide high efficiency of process (83.93% and 91.74%, respectively). Pectin turned out to be the least appropriate polysaccharide because it is not able to assure sufficient protection for the core material, in this case Camelina sativa oil, due to low efficiency (61.36%) and high oxidation (16.11 eq/kg after seven days). β-glucan occurred to be the coating material with relatively high encapsulation efficiency (79.26%) but high humidity (4.97%) which could negatively influence the storage of microcapsules. The use of polysaccharides in microencapsulation, except performing the role of wall material, has the advantage of increasing the amount of dietary fiber in human diet.
Highlights
Microencapsulation is the process of creating a functional barrier between the core and shell materials to avoid chemical or physical reactions and to maintain the biological and physicochemical properties of the core material
Pectin was extracted from apples, and inulin was extracted from chicory. β-glucan used in the studies was extracted from barley by the method proposed by Kurek et al [8] and had a concentration of 85%
Pectin was the most stable (84.11%), the emulsions of inulin and gum arabic were characterized by comparable stability (75.93% and 75.00% respectively), while β-glucan was characterized by the lowest stability
Summary
Microencapsulation is the process of creating a functional barrier between the core and shell materials to avoid chemical or physical reactions and to maintain the biological and physicochemical properties of the core material. This is done by surrounding molecules or drops of the coating material or embedding them in a homogeneous or heterogeneous matrix to form capsules. This allows the movement of a solid, liquid or gas substance through another substance in the form of a capsule [1].
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