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Clinical Chemistry 25: 1774-1779, 1979;
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Clinical Chemistry, Vol 25, 1774-1779, Copyright © 1979 by American Association for Clinical Chemistry

Ribonucleic acid in plasma from normal adults and multiple myeloma patients

TC Hamilton, AG Smith, CA Griffin and RJ Henderson Jr

Reports of the presence of RNA in human plasma have been numerous, often suggesting that RNA in plasma is correlated with human disease. We critically examined the methods for determination of RNA in plasma. Lack of method specificity has caused previous workers to overestimate plasma RNA concentrations by more than 50-fold. To isolate RNA from plasma, we used both a phenol-chloroform extraction and a modified Schmidt-Thannhauser procedure. We show that RNA in plasma can be identified and quantified by alkaline hydrolysis of the plasma extract and subsequent separation of the resulting 2'- and 3'-mononucleotides by "high-performance" liquid chromatography. We could not detect RNA in plasma from either apparently healthy, normal adults or multiple myeloma patients, but found 1.1 mg/L in the plasma of a patient with Waldenstrom's macroglobulinemia. Our method is useful for the specific determination of RNA in plasma and will detect as little as 600 micrograms/L.


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Copyright © 1979 by the American Association for Clinical Chemistry.