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Kanokporn Sompornpailin

A260 is a peak OD for nucleic acid

A280 is a peak OD for protein

A230 is a peak OD for phenol

A260/A280 in the range 1.8-2.0 : The extract is rather clean

A260/A280 less than 1.8 : The extract may be high contamination by proteins and the other substances

Annisa Aulia

What if the range of A260/A280 is more than 2.0?

Chetan Chandrakant Gaonkar

If you have a OD of ~2, that means you got the best RNA.

A value of 2.1 is considered as pure RNA compared to that of 1.8-2.0

http://biomedicalgenomics.org/RNA_quality_control.html

Heba Shawky Mostafa

The ratio of optical density at (A260/A280) determined the purity of the extracted nucleic acid . This ratio should be in the range of 1.8-2.

So the ration should not exceed 2.0?

It can be up to 2.1.

i see, my highest 260/280 is 2.04, is it still considered normal?

It is indeed a good quality RNA.