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siRNA quantification using UV

siRNA quantification UV PBS DEPC water

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#1 huangh84



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Posted 16 August 2013 - 06:58 AM



I am trying to quantify some freeze-dried siRNA received from a company. I dissolved the siRNA in RNase free TE buffer (pH 7.6) and diluted further in either RNase free PBS or DEPC water to get a UV reading of between 0.2-1.


I find that the readings are very different. The DEPC water diluted siRNA gave a much higher 260 reading (50% more) than the PBS diluted siRNA. Proper baselines were used. The 260/230 and 260/280 ratios did not change, however.


The siRNAs themselves are ~14000 in molecular weight, and there is a modification on the 3' end of the sense with cholesterol linking, and PS modification on the 5' and 3' ends.


I wonder why this is the case and which reading I should use to quantify the siRNA.


Thank you very much!



#2 pcrman



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Posted 16 August 2013 - 10:05 AM

What reading will you get if you use blank DEPC water and PBS for the measurement? 

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