Process for preparing lipoid-biologically active particles

Process for the preparation of particles from lipoid-soluble substances and compositions containing said particles and biologically active substances bound to them, which comprises admixing an egg lecithin and cholesterol dissolved in absolute alcohol, with

• (a) a biologically active substance taken up in an aqueous electrolyte having a pH of 2 to 10, in a volume ratio of 1:1000-9:1, stirring the reaction mixture for at least one minute, allowing it to stand for at most 7 days and separating the particles precipitated from the solution;
• or
• (b) an aqueous electrolyte having a pH of 2 to 10, in a volume ratio of 1:1000 to 9:1, and isolating the precipitated particles
• (c) an aqueous electrolyte solution in a volume ratio of 1:1000 to 9:1, isolating the precipitated particles, adding them to a biologically active substance taken up in an aqueous electrolyte solution having a pH of 2 to 10, stirring the solution obtained for at least two minutes, allowing to stand for at most 7 days and isolating the particles formed, or
• (d) adding to the particles prepared according to variant (b) a biologically active substance taken up in an aqueous electrolyte solution having a pH of 2 to 10 and forming a suspension.