Mint oil Encapsulation with Alginate/pectin using Co-axial Electrospray system

Mint oil Encapsulation with Alginate/pectin using Co-axial Electrospray system
mint oil; encapsulation; alginate; pectin; electrospray system; core-shell type
Issue Date
11th International Hydrocolloids conference
Mint oil is natural essential oil and used in food, pharmaceutical and flavouring industry. However, mint oil has strong taste and odour, which constitutes a serious inconvenience for its use as supplement or mint flavour capsule. Moreover, mint oil easily undergoes oxidation when exposed to air or UV. To overcome these drawbacks, we have microencapsulated the oil in calcium alginate-pectin beads. The electrospray technique has exhibited great advantages in production of controllable particles with mono-disperse size distribution over their techniques. Single nozzle electrospraying was implemented by applying a sufficiently string electric field, usually a few kilovolts, to the shell-core emulsion solution. Recently, two-phase coaxial electrospray system is reported that two liquids are injected separately through two concentrically located and electrified capillary needles. The advantages of this co-axial electrospray system include that it is facile and the resultant capsules have controllable characteristics and maximum retention of the core material. Many parameters including applied voltage, flow rates of the core and shell solutions and the physical properties of the shell solutions properties play important roles in determining geometrical parameters of the final capsule. In order to gain a better understanding of the potential of co-axial electrospray system for encapsulation, the objective of this study was to investigate the effects of formulation and processing conditions on properties of microcapsules with an emphasis on capsule size, morphology, encapsulation efficiency and intensity. The results of mint oil encapsulation suggested that the core-shell type structure can be retained and optimized by adjusting many parameters such as voltage, flow rates, concentration of shell solution. The encapsulation efficiency of mint oil was found to be improved in optimized formula capsule. Therefore, co-axial e
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