Ultrospec 7500 User Manual
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41 56 2050 REV03
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92
Nucleic Acid and Protein Purity Ratios
A260/A280 =
A260
–
A320
A280
–
A320
A260/A230 =
A260
–
A320
A230
–
A320
A260 is the absorbance at 260 nm.
A280 is the absorbance at 280 nm.
A230 is the absorbance at 230 nm.
A320 is the optional background absorbance at 320 nm.
References:
Measuring protein concentration in the presence of nucleic acids by A280/A260: The method of Warburg and Christian. (2006). Cold
Spring Harbor Protocols (1).
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