Denaturing agarose gel

In comparing to regular agarose gel, denaturing agarose gel requires special chemical reagents in gel ,running buffer, and loading buffer. These chemicals denatures sample in agarose gel so that molecules in the sample runs at a migration rate corresponding to their size only.

Smart tips in denaturing agarose gel:

How to run precast gel using only 15ml running buffer?

How to screening 96 PCR samples in 6 minute?

How to change gel length between 2cm to 12cm for agarose saving? 

How to save up to 90% antibodies in immunohistochemistry?

MOPS denaturing agarose gel

  10 x MOPS denaturing buffer:

0.2M MOPS (morpholinopropanesulphonic acid)
50mM sodium acetate
5mM EDTA

RNA denaturing buffer:

10ml 100% deionized formamide
3.5ml 40% formaldehyde
1.5ml 10 x MOPS buffer
Formamide should be deionized by stirring 100ml with approximately 20g of Amberlite MB3 (or MB1) ion exchange resin before application to denaturing agarose gel.

Denaturing agarose gel is prepared by melting the required amount of agarose in distilled water, cooling to approximately 60°C (hand hot) and adding 40% formaldehyde and 10 x MOPS to give 2.2M formaldehyde and 1 x MOPS, respectively. 

Example: For 50ml of a 1% agarose gel, melt 0.5g agarose in 37ml H2O, cool to hand hot, add 5ml 10 x MOPS buffer and 8.75ml 40% formaldehyde.

denaturing agarose gel electrophoresis is in 1 x MOPS, 2.2M formaldehyde.

RNA samples are prepared by adding up to 25mg of RNA in a maximum of 5ul sterile H2O, to 15ul RNA denaturing buffer. 1ul 10mg / ml ethidium bromide is added to aid visualization of RNA after denaturing agarose gel electrophoresis.

Immediately prior to loading, RNA samples should be heated to 65°C for 10 minutes to denature any secondary structure, cooled on ice for 2 minutes and then 2ul of denaturing agarose gel loading buffer is added.

Samples are loaded onto the denaturing agarose gel and electrophoresis using Biokeystone high performance gel systems.