Effect of polymer and polymer blends on encapsulation efficiency of spray-dried microencapsulated flaxseed oil
2020
Yasmin, I. | Hayee, A. | Maqsood, M. | Ciftci, O. N. | Khan, M. R. | Shabbir, M. A. | Naz, S. | Aadil, R. M. | Sameen A.
Flaxseed oil emulsions were prepared by homogenising flaxseed oil, gum Arabic (GA), maltodextrin (MD), and inulin (IN) in water (polymers were used alone and in combinations). Emulsions were analysed for their stability and viscosity. Results indicated that emulsions containing IN showed some layer separation while most of the emulsions were stable before spray-drying. The microparticles obtained after spray-drying were analysed for encapsulation efficiency, surface oil, density, flowing properties, moisture, water activity, colour parameters (L*, a*and b*), particle size, morphology, dissolution behaviour, X-ray diffraction (XRD) pattern, and differential scanning colorimetery (DSC). All the encapsulated flaxseed oil powders (EFOPs) showed a bimodal particle size distribution with average particle size in the range of 1.18 to 9.80 μm. GA:MD (1:1) showed the highest encapsulation efficiency (92%) and lower surface oil. Scanning electron micrographs depicted spherical particles with no apparent cracks. IN yielded smooth-surfaced microparticles. DSC thermograms depicted that microcapsules were thermally stable. XRD analysis showed that most of the EFOPs were amorphous and spray-drying did not change the structure of wall materials. Dissolution behavior showed that presence of IN increased the solubility of EFOPs in water at room temperature. Hence, it is concluded that IN and MD effectively support GA in encapsulating flaxseed oil.
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