Estradiol palmitate
Clinical data
Trade namesEsmopal
Other namesEstradiol monopalmitate; Estradiol hexadecanoate; Estradiol 17β-hexadecanoate
Drug classEstrogen; Estrogen ester
Identifiers
  • [(8R,9S,13S,14S,17S)-3-Hydroxy-13-methyl-6,7,8,9,11,12,14,15,16,17-decahydrocyclopenta[a]phenanthren-17-yl] hexadecanoate
CAS Number
PubChem CID
ChemSpider
UNII
CompTox Dashboard (EPA)
ECHA InfoCard100.024.819 Edit this at Wikidata
Chemical and physical data
FormulaC34H54O3
Molar mass510.803 g·mol−1
3D model (JSmol)
  • CCCCCCCCCCCCCCCC(=O)O[C@H]1CC[C@H]2[C@@H]3CCc4cc(O)ccc4[C@H]3CC[C@]12C
  • InChI=1S/C34H54O3/c1-3-4-5-6-7-8-9-10-11-12-13-14-15-16-33(36)37-32-22-21-31-30-19-17-26-25-27(35)18-20-28(26)29(30)23-24-34(31,32)2/h18,20,25,29-32,35H,3-17,19,21-24H2,1-2H3/t29-,30-,31+,32+,34+/m1/s1
  • Key:XQKLZLWOOGGXMV-KWXXMMNJSA-N

Estradiol palmitate (brand name Esmopal), or estradiol monopalmitate, also known as estradiol 17β-hexadecanoate, is a naturally occurring[1] steroidal estrogen and an estrogen ester – specifically, the C17β palmitate ester of estradiol.[2] It occurs in the body as a very long-lasting metabolite and prohormone of estradiol.[1] The compound has no affinity for the estrogen receptor, requiring transformation into estradiol for its estrogenic activity.[3] In addition to its endogenous role, estradiol palmitate was formerly used as a fattening agent in chickens under the brand name Esmopal.[4][5][6][7][8]

Affinities and estrogenic potencies of estrogen esters and ethers at the estrogen receptors
Estrogen Other names RBATooltip Relative binding affinity (%)a REP (%)b
ER ERα ERβ
Estradiol E2 100 100 100
Estradiol 3-sulfate E2S; E2-3S ? 0.02 0.04
Estradiol 3-glucuronide E2-3G ? 0.02 0.09
Estradiol 17β-glucuronide E2-17G ? 0.002 0.0002
Estradiol benzoate EB; Estradiol 3-benzoate 10 1.1 0.52
Estradiol 17β-acetate E2-17A 31–45 24 ?
Estradiol diacetate EDA; Estradiol 3,17β-diacetate ? 0.79 ?
Estradiol propionate EP; Estradiol 17β-propionate 19–26 2.6 ?
Estradiol valerate EV; Estradiol 17β-valerate 2–11 0.04–21 ?
Estradiol cypionate EC; Estradiol 17β-cypionate ?c 4.0 ?
Estradiol palmitate Estradiol 17β-palmitate 0 ? ?
Estradiol stearate Estradiol 17β-stearate 0 ? ?
Estrone E1; 17-Ketoestradiol 11 5.3–38 14
Estrone sulfate E1S; Estrone 3-sulfate 2 0.004 0.002
Estrone glucuronide E1G; Estrone 3-glucuronide ? <0.001 0.0006
Ethinylestradiol EE; 17α-Ethynylestradiol 100 17–150 129
Mestranol EE 3-methyl ether 1 1.3–8.2 0.16
Quinestrol EE 3-cyclopentyl ether ? 0.37 ?
Footnotes: a = Relative binding affinities (RBAs) were determined via in-vitro displacement of labeled estradiol from estrogen receptors (ERs) generally of rodent uterine cytosol. Estrogen esters are variably hydrolyzed into estrogens in these systems (shorter ester chain length -> greater rate of hydrolysis) and the ER RBAs of the esters decrease strongly when hydrolysis is prevented. b = Relative estrogenic potencies (REPs) were calculated from half-maximal effective concentrations (EC50) that were determined via in-vitro β‐galactosidase (β-gal) and green fluorescent protein (GFP) production assays in yeast expressing human ERα and human ERβ. Both mammalian cells and yeast have the capacity to hydrolyze estrogen esters. c = The affinities of estradiol cypionate for the ERs are similar to those of estradiol valerate and estradiol benzoate (figure). Sources: See template page.

See also

References

  1. ^ a b Hochberg RB, Pahuja SL, Larner JM, Zielinski JE (1990). "Estradiol-fatty acid esters. Endogenous long-lived estrogens". Annals of the New York Academy of Sciences. 595 (1): 74–92. Bibcode:1990NYASA.595...74H. doi:10.1111/j.1749-6632.1990.tb34284.x. PMID 2197972. S2CID 19866729.
  2. ^ Elks J (14 November 2014). The Dictionary of Drugs: Chemical Data: Chemical Data, Structures and Bibliographies. Springer. p. 898. ISBN 978-1-4757-2085-3.
  3. ^ Janocko L, Larner JM, Hochberg RB (April 1984). "The interaction of C-17 esters of estradiol with the estrogen receptor". Endocrinology. 114 (4): 1180–1186. doi:10.1210/endo-114-4-1180. PMID 6705734.
  4. ^ Gerrits RJ (March 1970). "The Influence of Hormones on the Production of Meat". Sci Teacher. 37 (3): 31–34. JSTOR 24151460.
  5. ^ Gardiner EE, Newberry RC, Hunt JR (January 1988). "Effect of estradiol-17 beta-monopalmitate on the incidence of sudden death syndrome in male broiler chickens". Poultry Science. 67 (1): 156–157. doi:10.3382/ps.0670156. PMID 3375173.
  6. ^ Bassila MK, Adams RL, Pratt DE, Stadelman WJ (1975). "Effects of Sex, Strain and Estrogens on Quality of Chicken Roasters". Poultry Science. 54 (3): 696–702. doi:10.3382/ps.0540696. ISSN 0032-5791.
  7. ^ Moran ET, Etches RJ (June 1983). "Finishing broiler toms using an estradiol 17 beta implant together with a high energy-low protein final feed". Poultry Science. 62 (6): 1010–1020. doi:10.3382/ps.0621010. PMID 6878131.
  8. ^ Mickelberry WC (1968). "Influence of Dietary Fats and Estradiol 17 Beta Monopalmitate Upon the Edible Meat Yield of Roaster Chickens". Poultry Science. 47 (4): 1254–1257. doi:10.3382/ps.0471254. ISSN 0032-5791.
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