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Updated: Sep 27, 2026

Extraction of High Molecular Weight Genomic DNA from Soils and Sediments
Published on: November 10, 2009
Removal of PCR inhibitors from soil DNA by chemical flocculation
Michael D Braid1, Laura M Daniels, Christopher L Kitts
1Ciphergen Biosystems, Incorporated, 6611 Dumbarton Circle, Fremont, CA 94555, USA.
Abstract:
Extracting high-purity DNA directly from soil has become essential for the study of microorganisms in environmental samples. However, many soils contain compounds that inhibit enzymes involved in manipulating DNA. In this study, chemical flocculation using multivalent cations was investigated as a potential method for eliminating soil-based inhibitors during the extraction process. The addition of AlNH(4)(SO(4))(2) during extraction significantly reduced the co-purification of PCR inhibitors with minimal loss of DNA yield.
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