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Product and process for isolating RNA

  • US 4,843,155 A
  • Filed: 11/19/1987
  • Issued: 06/27/1989
  • Est. Priority Date: 11/19/1987
  • Status: Expired due to Term
First Claim
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1. A method of isolating RNA from a biological tissue sample including RNA, DNA and proteins, comprising:

  • homogenizing said tissue sample with a denaturing solvent which consists essentially of a guanidinium compound selected from the group consisting of guanidinium thiocyanate and guanidinium chloride, phenol and a buffer in an amount sufficient to maintain said solvent at or about pH 4, to form a homogenate;

    adding a water-insoluble organic solvent to said homogenate and centrifuging to form a two-phase mixture having an aqueous phase and an organic phase, wherein said RNA is concentrated in said aqueous phase, and said DNA and proteins are concentrated in said organic phase or in the interphase;

    precipitating said RNA from said aqueous phase by adding a lower alcohol to said aqueous phase; and

    recovering the precipitated RNA by centrifugation of said aqueous phase and decanting the supernatant liquid.

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