The blackPREP Powder DNA/RNA Kit is particularly ideal for the extraction of viral and bacterial nucleic acids from difficult starting materials, such as soaps, tea, soil, milk and powdery solids of unknown´origin. The purification is based on an effective prefiltration to eliminate insoluble materials and inhibitors. Through the use of a novel filter membrane, nucleic acids can be optimally collected and enriched. Ultracentrifugation and special laboratory equipment are not necessary for the purification. The unique extraction routine is shown in only one protocol and can be used for all materials tested previously. The isolated highly pure nucleic acids are directly available for a variety of downstream reactions.