MOPS

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== External links ==
== External links ==
* [http://en.wikipedia.org/wiki/MOPS Wikipedia MOPS]
* [http://en.wikipedia.org/wiki/MOPS Wikipedia MOPS]
 +
* [http://www.fermentas.com/techinfo/electrophoresis/rnaloading.htm#MOPS_ MOPS recipe at Fermentas]
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* [http://www.sigmaaldrich.com/catalog/ProductDetail.do?N4=M5755|SIGMA&N5=SEARCH_CONCAT_PNO|BRAND_KEY&F=SPEC premade MOPS 10x from Sigma]
* [http://cshprotocols.cshlp.org/cgi/content/full/2006/3/pdb.rec8332?maxtoshow=&HITS=10&hits=10&RESULTFORMAT=&fulltext=mops&searchid=1&FIRSTINDEX=0&resourcetype=HWCIT&text_only=true CSH Protocols MOPS] [[Image:Padlock-closed.png]]
* [http://cshprotocols.cshlp.org/cgi/content/full/2006/3/pdb.rec8332?maxtoshow=&HITS=10&hits=10&RESULTFORMAT=&fulltext=mops&searchid=1&FIRSTINDEX=0&resourcetype=HWCIT&text_only=true CSH Protocols MOPS] [[Image:Padlock-closed.png]]

Revision as of 13:02, 2 March 2009

The other mops
The other mops

MOPS is the common name for the buffering compound in MOPS buffer. MOPS stands for 3-(N-morpholino) propanesulfonic acid and with a pKa of 7.20, MOPS is an good buffer for many biological systems at almost neutral pH. HEPES is a chemically similar pH buffering compound.

Contents

Recipe for 10x MOPS buffer

chemical structure of MOPS, 3-(N-morpholino) propanesulfonic acid
chemical structure of MOPS, 3-(N-morpholino) propanesulfonic acid
  • 41.9 g MOPS; MW 209.3 g/mol
  • 2.7 g Sodium Acetate, trihydrate; MW 136.1 g/mol (watch out: NaAc, anhydrous is only 82 g/mol or 1.6g)
  • 2.9 g EDTA, sodium salt; MW 292.2 g/mol


  • add 800 ml of nuclease free distilled water; mix to dissolve
  • adjust to pH 7 with NaOH (prepared in nuclease free distilled water)
  • fill to the final volume of 1000 ml


  • filter sterilise or autoclave
  • store at room temperature
  • protect from light; do not use if the solution appears yellow

Final concentration of active compounds in 10x stock

  • 200 mM MOPS (buffering)
  • 20 mM NaAc
  • 10 mM EDTA (nuclease inhibition by Mg2+ chelation)

Note: Farrell uses higher concentrations for 10x stock: 400 mM MOPS, 100 mM NaAc, 10 mM EDTA

Stability of MOPS

Contrary to common belief, MOPS is sufficiently heat-stable to be autoclaved. Solution will turn yellow but this does not interfere with its buffering capacity. See, for example, Farrell RNA methods, p201 [1]. Straw coloured buffer is but do not use darker buffer.

Some OWW protocols which use MOPS

External links

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