Microencapsulation of Fish Oil by Spray Granulation and Fluid Bed Film Coating

Abstract

The stability of microencapsulated fish oil prepared with 2 production processes, spray granulation (SG) and SG followed by film coating (SG-FC) using a fluid bed equipment, was investigated. In the 1st process, 3 types of fish oil used were based on the ratios of eicosapentaenoic acid (EPA) and docosahexaenoic acid (DHA) (10/50, 33/22, and 18/12). Each type was emulsified with soluble soybean polysaccharide (SSPS) and maltodextrin to produce 25% oil powders. In the 2nd process, 15% film coating of hydroxypropyl betacyclodextrin (HPBCD) was applied to the granules from the 1st process. The powder stability against oxidation was examined by measurement of peroxide values (PV) and headspace propanal after storage at room temperature and at 3 to 4 degrees C for 6 wk. Uncoated powder containing the lowest concentration of PUFA (18/12) was found to be stable during storage at room temperature with maximum PV of 3.98 +/- 0.001 meq/kg oil. The PV increased sharply for uncoated powder with higher concentration of omega-3 (in 33/22 and 10/50 fish oils) after 3 wk storage. The PVs were in agreement with the concentration of propanal, and these 2 parameters remained constant for most of the uncoated powders stored at low temperature. Unexpectedly, the outcomes showed that the coated powders had lower stability than uncoated powders as indicated by higher initial PVs; more hydroperoxides were detected as well as increasing propanal concentration. The investigation suggests that the film-coating by HPBCD ineffectively protected fish oil as the coating process might have induced further oxidation; however, SG is a good method for producing fish oil powder and to protect it from oxidation because of the "onion skin" structure of granules produced in this process.

Comparative Study on Different Drying Methods of Fish Oil Microcapsules

“…The image showed the microcapsules of SFD powders had spherical shape and porous surface structure. From Figures 5(b), 5(c), and 5(d), it was found that the microstructure of SD was similar to that of SFD with spherical shape structure but had smooth surface and occurrence of dents and cracks was less, which was similar to the spray granulation (SG) powder done by Anwar et al [32]. Aghbashlo et al [34] reported that the microcapsules produced by SD were almost spherical in shape and had a slightly smooth surface without any particle expansion, which was consistent with the results of this study.…”

“…Microcapsule's microstructure and morphology are important to determine their stability, functionality, and flowability [32]. Figure 5 shows the scanning electron microscopy (SEM) images of fish oil microcapsules obtained by different drying methods (SD, FD, and SFD) in order to investigate the surface morphology and microstructure.…”

“…The reason for the difference of microstructure between FD and SFD was the spray drying process of SFD, which can spray the emulsion liquid to spheroid. Anwar et al [32] pointed that the absence of cracks is critically important to wall functionality in limiting fish oil deterioration or oxidation during storage. Therefore, SD and SFD can effectively avoid the deterioration and oxidation of fish oil.…”

Microencapsulation of essential oils with biodegradable polymeric carriers for cosmetic applications

“…Several methods have been purposed for microcapsule's production [13][14][15][16][17][18][19][20][21][22], in order to be adapted to different types of core and shell materials, as well as, to generate particles with various sizes, shell thickness and permeability, thus adjusting the release rate of the active principle. Generally these techniques can be divided into two major categories, namely chemical and physical methods; the latter one can be subdivided into physicochemical and physicomechanical techniques [6].…”

α- and β-Carotene Stability During Storage of Microspheres Obtained from Spray-Dried Microencapsulation Technology

“…Both maltodextrin and gum Arabic may be applied as the coating material. Gum Arabic is an effective carrier because of its high solubility in water, low solution viscosity and ability to form a protective fi lm around the particles of the dispersed phase of the emulsion [Dickinson et al, 1989 Arabic and constitutes an effective anti-oxygen barrier, but on the other hand it has poor emulsifying ability [Anwar et al, 2010]. Thus gum Arabic combined with maltodextrin may be a perfect matrix to protect β-carotene during spray--dried microencapsulation process.…”