Y. Kawano et al., Characteristics of biodegradable microcapsules by solvent evaporation in (W/O/W) emulsion system, J CHEM EN J, 34(9), 2001, pp. 1182-1186
Biodegradable microcapsules entrapping water soluble materials such as pota
ssium nitrate, bovine serum albumin, and egg yolk proteins are prepared by
the solvent evaporation method in a (W/O/W) complex emulsion system. Effect
s of preparation conditions of a (W/O/W) emulsion on the capsule morphology
and the entrapment efficiency of the core materials are investigated. The
entrapment efficiency of the core material is improved by decreasing in the
volume fraction and the concentration of salt in the inner aqueous phase,
by the irradiation of ultrasonic wave to (W/O) emulsion, and by increasing
in the concentration of salt in the outer aqueous phase. The entrapment eff
iciency decreases by releasing of the core material in the course of wall f
ormation of the microcapsules.