Abstract: Disclosed is a process for purifying nucleic acids, especially plasmid DNA, from a nucleic acid-containing, biologic sample, consisting of (a) preparation of a fluid sample containing nucleic acid and endotoxin each in dissolved form; (b) precipitation at least of nucleic acid and endotoxin from the fluid sample; (c) washing of the components of the fluid sample precipitated out in step b) in order to at least partially remove the endotoxin with at least one washing solution, which contains at least one amine compound with at least two carbon atoms and with a molar mass of ?500 g/mol and; at least one organic solvent different from the aforementioned amine compound and has a pH-value (20° C.) in the range from pH 3.0 to pH 8.5, and; (d) dissolution of the remaining nucleic acid from the washed, precipitated constituents from step c) using a dissolving buffer and collection of the dissolved nucleic acids in a separate receptacle. The process is suitable for the effective and economical removal of endotoxins.

Abstract: A process for purifying nucleic acids, especially plasmid DNA, from a nucleic acid-containing, biologic sample, consisting of the following steps: a) Preparation of a fluid sample containing nucleic acid and endotoxin each in dissolved form; b) Precipitation at least of nucleic acid and endotoxin from the fluid sample; c) Washing of the components of the fluid sample precipitated out in step b) in order to at least partially remove the endotoxin with at least one washing solution, which contains (i) at least one amine compound with at least two carbon atoms and with a molar mass of ?500 g/mol and; (ii) at least one organic solvent different from the aforementioned amine compound and has a pH-value (20° C.) in the range from pH 3.0 to pH 8.5, and; d) Dissolution of the remaining nucleic acid from the washed, precipitated constituents from step c) using a dissolving buffer and collection of the dissolved nucleic acids in a separate receptacle.