MOPS

MOPS (3-(N-morpholino)propanesulfonic acid) is a buffer introduced by Good et al. in the 1960s. It is a structural analog to MES.[1] Its chemical structure contains a morpholine ring. HEPES is a similar pH buffering compound that contains a piperazine ring. With a pKa of 7.20, MOPS is an excellent buffer for many biological systems at near-neutral pH.

MOPS
Names
IUPAC name
3-Morpholinopropane-1-sulfonic acid
Other names
3-(N-Morpholino)propanesulfonic acid,
3-Morpholinopropanesulfonic acid,
3-N-Morpholino propansulfonic acid,
4-Morpholinepropanesulfonic acid
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.013.162
UNII
Properties
C7H15NO4S
Molar mass 209.26 g·mol−1
Hazards
Safety data sheet MSDS
GHS pictograms
GHS Signal word Warning
GHS hazard statements
 H315, H319, H335
P261, P264, P271, P280, P302+352, P304+340, P305+351+338, P312, P321, P332+313, P337+313, P362, P403+233, P405, P501
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).
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Infobox references

Applications

MOPS is frequently used as a buffering agent in biology and biochemistry. It has been tested and recommended for polyacrylamide gel electrophoresis.[2] Usage above 20 mM in mammalian cell culture work is not recommended.[3] MOPS buffer solutions become discolored (yellow) over time, but reportedly slight discoloration does not significantly affect the buffering characteristics.[4]

gollark: Observe, "fractal art".
gollark: For instance, there is now `fractalart-rs`, now that I've fixed it, *and* `calibre-indexer`, from a while ago.
gollark: https://github.com/osmarks/random-stuff ← updates have occurred to this
gollark: Although in the modern era both will just be memetically cryoapiocooled.
gollark: Also true.

See also

References
  1. Good, Norman E.; Winget, G. Douglas; Winter, Wilhelmina; Connolly, Thomas N.; Izawa, Seikichi; Singh, Raizada M. M. (1966). "Hydrogen Ion Buffers for Biological Research". Biochemistry. 5 (2): 467–77. doi:10.1021/bi00866a011. PMID 5942950.
  2. Thomas, J; Hodes, ME (1981). "A new discontinuous buffer system for the electrophoresis of cationic proteins at near-neutral pH". Analytical Biochemistry. 118 (1): 194–6. doi:10.1016/0003-2697(81)90178-0. PMID 6278979.
  3. Eagle, H. (1971). "Buffer Combinations for Mammalian Cell Culture". Science. 174 (4008): 500–3. doi:10.1126/science.174.4008.500. PMID 5110427.
  4. https://bostonbioproducts.com/products/mops-buffer-1-m-ph-74-bbm-74. Missing or empty |title= (help)
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