Digitonin

Digitonin

Names
Other names digitin
Identifiers
CAS Number	11024-24-1
ChEMBL	ChEMBL404811
ChemSpider	23753
EC Number	234-255-6
Jmol interactive 3D	Image
KEGG	C00765
PubChem	25444
InChI InChI=1S/C56H92O29/c1-19-7-10-56(75-17-19)20(2)31-45(85-56)37(67)32-22-6-5-21-11-26(24(61)12-55(21,4)23(22)8-9-54(31,32)3)76-50-42(72)39(69)44(30(16-60)80-50)81-53-48(47(36(66)29(15-59)79-53)83-49-40(70)33(63)25(62)18-74-49)84-52-43(73)46(35(65)28(14-58)78-52)82-51-41(71)38(68)34(64)27(13-57)77-51/h19-53,57-73H,5-18H2,1-4H3/t19-,20+,21+,22-,23+,24-,25-,26-,27-,28-,29-,30-,31+,32-,33+,34-,35+,36?,37+,38+,39-,40-,41-,42-,43-,44+,45-,46+,47+,48-,49+,50-,51+,52+,53+,54-,55+,56-/m1/s1 Key: UVYVLBIGDKGWPX-YCCXZQINSA-N InChI=1/C56H92O29/c1-19-7-10-56(75-17-19)20(2)31-45(85-56)37(67)32-22-6-5-21-11-26(24(61)12-55(21,4)23(22)8-9-54(31,32)3)76-50-42(72)39(69)44(30(16-60)80-50)81-53-48(47(36(66)29(15-59)79-53)83-49-40(70)33(63)25(62)18-74-49)84-52-43(73)46(35(65)28(14-58)78-52)82-51-41(71)38(68)34(64)27(13-57)77-51/h19-53,57-73H,5-18H2,1-4H3/ t19-,20+,21+,22-,23+,24-,25-,26-,27-,28-,29-,30-,31+,32-,33+,34-,35+,36?,37+,38+,39-,40-,41-,42-,43-,44+,45-,46+,47+,48-,49+,50-,5 1+,52+,53+,54-,55+,56-/m1/s1
SMILES O[C@@H]%11[C@@H](O)[C@H](O)[C@H](O[C@H]%11O[C@@H]1[C@@H](O)[C@@H](O[C@H](CO)[C@@H]1O)O[C@@H]%10[C@@H](O[C@@H]2OC[C@@H](O)[C@H](O)[C@H]2O)C(O)[C@H](O[C@H]%10O[C@@H]3[C@H](O)[C@@H](O)[C@@H](O[C@@H]3CO)O[C@H]9[C@H](O)C[C@@]8(C)[C@@H](CC[C@@H]6[C@@H]8CC[C@@]7([C@@H]5[C@@H](O[C@@]4(OC[C@@H](CC4)C)[C@H]5C)[C@@H](O)[C@@H]67)C)C9)CO)CO
Properties
Chemical formula	C56H92O29
Molar mass	1229.3 g/mol
Melting point	244.0–248.5 °C (471.2–479.3 °F; 517.1–521.6 K)[1]
Chiral rotation ([α]D)	-40 ° (Wavlen: 589.3 nm; Temp: 20 °C)[1]
Hazards
Lethal dose or concentration (LD, LC):
LD50 (Median dose)	23 mg/kg (rat, intravenous)[2] 4 mg/kg (mouse, intravenous)[3]
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

Digitonin is a steroidal saponin (saraponin) obtained from the foxglove plant Digitalis purpurea. Its aglycone is digitogenin, a spirostan steroid. It has been investigated as a detergent, as it effectively water-solubilizes lipids. As such, it has several potential membrane-related applications in biochemistry, including solubilizing membrane proteins, precipitating cholesterol, and permeabilizing cell membranes.^[4][5]

Digitonin is sometimes confused with the cardiac drug digoxin (sometimes also called digitalis or digitoxin) and both can be extracted from the same source.

Structure of Digitonin using sugar abbreviations (Gal = Galactose, Glc = Glucose, Xyl = Xylose)

Physical, chemical and biological properties

Critical micelle concentration = < 0.5 mM
Average micellar weight = 70000
Appearance = White to off-white powder
Boiling Point/Melting Point = 230 to 240 °C
Aggregation number = 60
Rat-LD₅₀ = 4 mg/kg body weight (IVN), 51 mg/kg body weight (ORAL)

References

1. Tschesche, R.; Wulff, G. (January 1963). "Über saponine der spirostanolreihe—IX". Tetrahedron (in German) 19 (4): 621–634. doi:10.1016/S0040-4020(01)98548-5.
2. Segal, Ruth; Milo-Goldzweig, Ilana; Kaplan, Gideon; Weisenberg, Emil (April 1977). "The protective action of glycyrrhizin against saponin toxicity". Biochemical Pharmacology 26 (7): 643–645. doi:10.1016/0006-2952(77)90039-9.
3. Pitha, Josef; Szente, Lajos (February 1984). "Digitonin derivatives of low toxicity: Potential solubilizers for lipophilic compounds". Journal of Pharmaceutical Sciences 73 (2): 240–243. doi:10.1002/jps.2600730224.
4. Geelen, Math J.H. (December 2005). "The use of digitonin-permeabilized mammalian cells for measuring enzyme activities in the course of studies on lipid metabolism". Analytical Biochemistry 347 (1): 1–9. doi:10.1016/j.ab.2005.03.032.
5. Fiskum, Gary (April 1985). "Intracellular levels and distribution of Ca2+ in digitonin-permeabilized cells". Cell Calcium 6 (1-2): 25–37. doi:10.1016/0143-4160(85)90032-6.