A sensitive, fast, durable, highly selective method for the determination of amino acids and biogenic amines in the cerebrospinal fluid and other body fluids and tissues.

A sensitive, fast, durable HPLC method with high resolution for the determination of amino acids and some biogenic amines is described. It allows the simultaneous determination of more than 40 substances in the cerebrospinal fluid or other body fluids or tissues. The method allows to measure both, the free and the conjugated amino acids. It detects 5 X 10(-13) g of most amino acids and measures the relevant substances in their physiological concentrations with less than 0.1 ml cerebrospinal fluid. The precision is 1-2%.