Abstract: Apparatus for converting electromagnetic radiation into thermal energy for use in isolating nucleic acids for subsequent analysis by a DNA polymerase chain reaction, comprising an electromagnetic radiation generator, which emits microwaves; a chamber, which is connected to the generator and confines the emitted microwaves; a plurality of stationary spots, which are fixedly attached onto the upper part of the chamber and project inwards, wherein the stationary spots are longitudinally separated from each other by identical intervals of predetermined distance, and the emitted electromagnetic radiation propagates within the chamber as a standing wave, and wherein the said predetermined distance is half the wavelength of the emitted radiation.

Abstract: Composition, method and kit of parts for a simplified and safe extraction of nucleic acids from biological samples, such as crude and processed food, and subsequent analysis by polymerase chain reaction to the presence of animal material, genetically modified organisms, allergens and pathogens. The method comprises the addition of extracting composition together with hot water for extraction and stabilization of nucleic acids as well as removal of substances interfering with DNA polymerase activity.