In the presence of a preserving additive, unilamellar phospholipid vesicle preparations are preserved during dehydration. Dehydration is effected by subjecting said preparations to a drying operations capable of causing flash evaporation....http://www.google.com.au/patents/US5089181?utm_source=gb-gplus-sharePatent US5089181 - Method of dehydrating vesicle preparations for long term storage
