TAPS (buffer)

TAPS ([tris(hydroxymethyl)methylamino]propanesulfonic acid) is a chemical compound commonly used to make buffer solutions.

TAPS
Names
Preferred IUPAC name
3-{[1,3-Dihydroxy-2-(hydroxymethyl)propan-2-yl]amino}propane-1-sulfonic acid
Other names
N-Tris(hydroxymethyl)methyl-3-aminopropanesulfonic acid
Identifiers
3D model (JSmol)
ChemSpider
ECHA InfoCard 100.045.398
UNII
  • InChI=1S/C7H17NO6S/c9-4-7(5-10,6-11)8-2-1-3-15(12,13)14/h8-11H,1-6H2,(H,12,13,14) ☒N
    Key: YNLCVAQJIKOXER-UHFFFAOYSA-N ☒N
  • InChI=1/C7H17NO6S/c9-4-7(5-10,6-11)8-2-1-3-15(12,13)14/h8-11H,1-6H2,(H,12,13,14)
    Key: YNLCVAQJIKOXER-UHFFFAOYAP
  • C(CNC(CO)(CO)CO)CS(=O)(=O)O
Properties
C7H17NO6S
Molar mass 243.27 g·mol−1
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

It can bind divalent cations, including Co(II) and Ni(II).[1]

TAPS is effective to make buffer solutions in the pH range 7.7–9.1, since it has a pKa value of 8.44 (ionic strength I = 0, 25 °C).[2]

The pH (and pKa at I ≠ 0) of the buffer solution changes with concentration and temperature, and this effect may be predicted e.g. using online calculators.[3]

References
  1. Machado, Carina M. M.; Gameiro, Paula; Soares, Helena M. V. M. (2008). "Complexation of M–(buffer)x–(OH)y systems involving divalent ions (cobalt or nickel) and zwitterionic biological buffers (AMPSO, DIPSO, TAPS and TAPSO) in aqueous solution". J. Solution Chem. 37 (5): 603–617. doi:10.1007/s10953-008-9265-3.
  2. Goldberg, Robert N.; Kishore, Nand; Lennen, Rebecca M. (2002). "Thermodynamic quantities for the ionization reactions of buffers" (PDF). J. Phys. Chem. Ref. Data. 31 (2): 231–370. doi:10.1063/1.1416902.
  3. "Biological buffers". REACH Devices.
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