Microencapsulation of Docosahexaenoic Acid Algal Oil Using Spray Drying Technology

Abstract

SUMMARYThis work aims at developing a process of microencapsulation of algal oil containing ≥40 % docosahexaenoic acid (DHA) using spray drying technology. Purity Gum® 2000 and Capsul®, both obtained from waxy corn starch, were chosen as the encapsulation materials. The effects of emulsification conditions on the droplet size, stability, viscosity and surface tension, and the effects of spraying conditions on the particle size, moisture content and surface oil content were investigated successively. The morphology of emulsion droplets and the microcapsules was observed by optical microscope and scanning electron micro scopy. The results showed that the produced spherical microcapsules were smooth and free of pores, cracks, and surface indentation when shear velocity was 8.63 m/s in the first step of emulsification, homogenization pressure was 1.75·108 Pa and number of passes through homogenization unit was six for fine emulsification, rotational speed of spray disk was 400 s -1 , and air inlet temperature was 170 °C. Therefore, it was concluded that the emulsification and encapsulation of algal oil containing DHA with above process was feasible.

Effect of ultrasound on the preparation of soy protein isolate-maltodextrin embedded hemp seed oil microcapsules and the establishment of oxidation kinetics models

“…Applying the technology to oils can slow down the oxidative degradation of oils during processing and storage [16] . The common method of microencapsulation is spray drying, which can convert liquid into powder with a rapid drying speed, less nutrient loss, and lower production cost, making the microcapsules easier to process, store and transport [17] , [18] . Studies have found that soy protein isolate (SPI) is a vegetable protein with good emulsifying properties and stability [19] , [20] and has the advantages of good processing performance, high nutritional value, and low cost.…”

Development of chitosan based microencapsulated spray dried powder of tuna fish oil: oil load impact and oxidative stability

“…Wall material and its ratio with the oil has significant effect on the moisture content. Shao et al (2018) observed that increase of solid content at 0.3 ratio in algal oil altered the viscosity toward high value that resulted in low moisture content due to unavailability of water for evaporation. In another study conducted by Bae and Lee (2008) on avocado oil spray drying wettability was ranged between 457-1083s.…”

Biological potential and microencapsulation of Cinnamomum cassia essential oil as an alternative for pest control in stored maize

“…The use of the atomization process in microencapsulation has advantages over other methods, being one of the most used techniques for essential oils, as it has stability and efficiency (Jafari et al, 2008), cost effectiveness, speed, formation of high quality microparticles (Shao et al, 2018), good yield, formation of very small particles (smaller than 100 μm), improves solubility, with consequent increase in product stability (Costa et al, 2013), good retention of volatile compounds (Huertas, 2010), and application on industrial scale (Azeredo, 2005). Some characteristics such as colour and flavor can be affected in the atomization process, due to both the material used and the drying parameters (air inlet and outlet temperatures, feed flow, drying speed, among others).…”