Journal
ANALYTICAL BIOCHEMISTRY
Volume 571, Issue -, Pages 49-52Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
DOI: 10.1016/j.ab.2019.02.002
Keywords
A(260)/A(280); A(260)/A(230); Nucleic acid quantification; Nanodrop; QIAxPert; Qubit
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Residual phenol, carried over from RNA purification, can alter RNA concentration measurements and is assumed to inhibit PCR. Here, we demonstrate that Impurities A260 values of spectral content profiling (SCP) UV/Vis measurements correlated with phenol concentration, whereas absorbance ratios of classical UV/Vis systems failed to reliably detect phenol in RNA samples. Phenol contamination led to over- or underestimation of RNA concentration on UV/Vis systems, whereas it had no influence on fluorometry quantification. Wrong RNA concentration results led to altered template input in qRT-PCR and consequently caused quantification cycle (Cq) shifts, although <= 0.01% phenol had no direct influence.
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