3
Measure dsDNA, ssDNA or RNA
Thermo Scientific
NanoDrop One User Guide
15
Best practices for nucleic acid measurements
• Isolate and purify nucleic acid samples before measurement to remove impurities.
Depending on the sample, impurities could include DNA, RNA, free nucleotides,
proteins, some buffer components and dyes. See
for more information.
• Ensure the sample absorbance is within the instrument’s
• Blank with the same buffer solution used to resuspend the analyte of interest. The
blanking solution should be a similar pH and ionic strength as the analyte solution.
• Run a
to assess the absorbance contribution of your buffer solution. If the
buffer exhibits strong absorbance at or near the analysis wavelength (typically 260 nm),
you may need to choose a different buffer or application. See
for more information.
• For micro-volume measurements:
–
Ensure pedestal surfaces are properly
–
If possible, heat highly concentrated or large molecule samples, such as genomic or
lambda DNA, to 63 °C (145 °F) and gently (but thoroughly) vortex before taking a
measurement. Avoid introducing bubbles when mixing and pipetting.
–
Follow
best practices for micro-volume measurements.
–
Use a 1-2 μL sample volume. See
for more
information.
• For cuvette measurements (NanoDrop One
C
instruments only), use compatible cuvettes
and follow
best practices for cuvette measurements.
Related Topics
• Measure a Micro-Volume Sample
• Measure a Sample Using a Cuvette
• Best Practices for Micro-Volume Measurements
• Best Practices for Cuvette Measurements
Note
Extraction reagents such as guanidine, phenol, and EDTA contribute
absorbance between 230 nm and 280 nm and will affect measurement results if
present in samples (even residual amounts).
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