Method of preparing natural-oil-containing emulsions and microcapsules and its uses

摘要

The invention relates to sustained-release biodegradable lice repelling preparations comprising as active ingredient a lice repelling agent comprising at least one natural oil selected from the group consisting of citronella oil, rosemary oil and eucalyptus oil, or at least one natural oil component selected from the group consisting of citronellal and geraniol or mixtures thereof and further comprising an anionic emulsifier and chitosan, optionally further comprising dermatologically acceptable additives, carriers or diluents. The preparations may be in the form of an aqueous emulsion or chitosan microcapsules, preferably prepared by the processes of the invention.