Devices and formulations

A method of delivering biological material in the form of a liquid aerosol, said method comprising the steps of supplying a liquid formulation comprising biological material to an outlet;

• subjecting the liquid formulation issuing from the outlet to an electric field, wherein the liquid formulation is processed electrohydrodynamically in a manner sufficient to cause a cone and a jet, such that comminuted matter is formed and the biological material is not substantially denatured,
• wherein the liquid formulation comprises surfactant at a concentration significantly greater than its critical micelle concentration and in an amount sufficient to allow a monolayer to be distributed over the communited matter;
• and
• wherein the biological material is selected from the group consisting of DNA, DNA fragments, plasmids, RNA, proteins, peptides, hormones, lipids, enzymes and cytokines.