| Article ID | Journal | Published Year | Pages | File Type |
|---|---|---|---|---|
| 592692 | Colloids and Surfaces A: Physicochemical and Engineering Aspects | 2014 | 7 Pages |
•Monodisperse W/O emulsions encapsulating ascorbic acid derivatives were formulated.•Calcium ascorbate and ascorbic acid 2-glucoside were encapsulated in W/O emulsions.•Uniformly sized aqueous droplets were generated by microchannel emulsification.•The resultant droplet size was affected by the continuous-phase viscosity.•Droplets were more stably generated when using a continuous phase of low viscosity.
The aim of this study was to investigate the effects of the emulsifying conditions and emulsifier type on production of water-in-oil (W/O) emulsions encapsulating ascorbic acid derivatives by microchannel (MC) emulsification. The ascorbic acid derivatives added in a dispersed aqueous phase are calcium ascorbate (AA-Ca) and ascorbic acid 2-glucoside (AA-2G). The continuous phase used was decane, soybean oil or their mixture, containing 5% (w/w) tetraglycerin monolaurate condensed ricinoleic acid ester or sorbitan trioleate. A hydrophobized silicon MC array plate (model: MS407) with a channel depth of 7 μm was used for MC emulsification. The use of MC emulsification enabled successful encapsulation of AA-Ca and AA-2G in monodisperse W/O emulsion droplets with coefficients of variation (CV) less than 7%. Their average droplet diameter (dav) increased with increasing the continuous-phase viscosity that is similar or higher than the dispersed-phase viscosity. The dav and CV of the resultant monodisperse W/O emulsions were unaffected by the dispersed-phase flow rate below critical values of 1.2–1.6 mL h−1 when using decane as the continuous-phase medium.
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