Off-patent: DNAzol from Thermo Fisher (Invitrogen)

DNAzol, a reagent for simple genomic DNA extraction which continues to be sold by Thermo for $300+ (for 100 ml!), is simply an aqueous mixture of guanidine thiocyanate, sodium acetate, isopropanol and sarkosyl. The associated patent was filed in 1995, which means it is now expired. See Example 6 for the recipe.

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