CHAPS is a zwitterionic surfactant used in the laboratory to solubilize biological macromolecules such as proteins. It may be synthesized from cholic acid^[1] and is zwitterionic due to its quaternary ammonium and sulfonate groups; it is structurally similar to certain bile acids, such as taurodeoxycholic acid and taurochenodeoxycholic acid. It is used as a non-denaturing detergent in the process of protein purification and is especially useful in purifying membrane proteins, which are often sparingly soluble or insoluble in aqueous solution due to their native hydrophobicity.^[2]

Quick Facts Names, Identifiers ...

CHAPS detergent

Names
IUPAC name 3-{Dimethyl[3-(3α,7α,12α-trihydroxy-5β-cholan-24-amido)propyl]azaniumyl}propane-1-sulfonate
Systematic IUPAC name 3-[Dimethyl(3-{(4R)-4-[(1'R,3aS,3bR,4R,5aS,7R,9aS,9bS,11S,11aR)-4,7,11-trihydroxy-9a,11a-dimethylhexadecahydro-1H-cyclopenta[a]phenanthren-1-yl]pentanamido}propyl)azaniumyl]propane-1-sulfonate
Other names 3-[(3-Cholamidopropyl)dimethylammonio]-1-propanesulfonate
Identifiers
CAS Number	75621-03-3 Y
3D model (JSmol)	Interactive image Interactive image
Abbreviations	CHAPS
ChEMBL	ChEMBL450950 Y
ChemSpider	96843 Y
ECHA InfoCard	100.129.679
KEGG	C11321 Y
MeSH	3-((3-Cholamidopropyl)dimethylammonium)-1-propanesulfonate
PubChem CID	107670 24883538 (),(5R,7S, 16S) 10371606 (),(1S,5R,11S, 16S) 25244640 (4R),(2S,5R,7S, 15R,16S) 18397788 (4R),(2S,5R, 14R,15R,16S) 9895216 (4S), (2S,5R,14R,15S,16S)
UNII	QBP25342AG Y
CompTox Dashboard (EPA)	DTXSID70997059
InChI InChI=1S/C32H58N2O7S/c1-21(8-11-29(38)33-14-6-15-34(4,5)16-7-17-42(39,40)41)24-9-10-25-30-26(20-28(37)32(24,25)3)31(2)13-12-23(35)18-22(31)19-27(30)36/h21-28,30,35-37H,6-20H2,1-5H3,(H-,33,38,39,40,41) N Key: UMCMPZBLKLEWAF-UHFFFAOYSA-N N InChI=1/C32H58N2O7S/c1-21(8-11-29(38)33-14-6-15-34(4,5)16-7-17-42(39,40)41)24-9-10-25-30-26(20-28(37)32(24,25)3)31(2)13-12-23(35)18-22(31)19-27(30)36/h21-28,30,35-37H,6-20H2,1-5H3,(H-,33,38,39,40,41)/t21-,22+,23-,24-,25+,26+,27-,28+,30+,31+,32-/m1/s1 Key: UMCMPZBLKLEWAF-BCTGSCMUBQ InChI=1S/C32H58N2O7S/c1-21(8-11-29(38)33-14-6-15-34(4,5)16-7-17-42(39,40)41)24-9-10-25-30-26(20-28(37)32(24,25)3)31(2)13-12-23(35)18-22(31)19-27(30)36/h21-28,30,35-37H,6-20H2,1-5H3,(H-,33,38,39,40,41)/t21-,22+,23-,24-,25+,26+,27-,28+,30+,31+,32-/m1/s1 Key: UMCMPZBLKLEWAF-BCTGSCMUSA-N
SMILES CC(CCC(=O)NCCC[N+](C)(C)CCCS([O-])(=O)=O)C1CCC2C3C(O)CC4CC(O)CCC4(C)C3CC(O)C12C [O-]S(=O)(=O)CCC[N+](C)(C)CCCNC(=O)CC[C@@H](C)[C@H]4CC[C@H]3[C@H]2[C@@H]([C@@]1([C@@H](C[C@H](O)CC1)C[C@H]2O)C)C[C@H](O)[C@@]34C
Properties
Chemical formula	C32H58N2O7S
Molar mass	614.88 g·mol−1
Surface tension:
CMC	8-10 mM
log P	−4.32 (predicted)
Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa). N verify (what is YN ?) Infobox references

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CHAPS is an abbreviation for 3-[(3-cholamidopropyl)dimethylammonio]-1-propanesulfonate. A related detergent, called CHAPSO, has the same basic chemical structure with an additional hydroxyl functional group; its full chemical name is 3-[(3-cholamidopropyl)dimethylammonio]-2-hydroxy-1-propanesulfonate. Both detergents have low light absorbance in the ultraviolet region of the electromagnetic spectrum, which is useful for monitoring ongoing chemical reactions or protein-protein binding with UV/Vis spectroscopy.

• Taurodeoxycholic acid
• Taurochenodeoxycholic acid