beta-Sitosterol

β-Sitosterol (beta-sitosterol) is one of several phytosterols (plant sterols) with chemical structures similar to that of cholesterol. It is a white, waxy powder with a characteristic odor, and is one of the components of the food additive E499. Phytosterols are hydrophobic and soluble in alcohols.

β-Sitosterol
Names
IUPAC name
17-(5-Ethyl-6-methylheptan-2-yl)-10,13-dimethyl-2,3,4,7,8,9,11,12,14,15,16,17-dodecahydro-1H-cyclopenta[a]phenanthren-3-ol
Other names
22,23-Dihydrostigmasterol, Stigmast-5-en-3-ol, β-Sitosterin
Identifiers
3D model (JSmol)
ChEBI
ChEMBL
ChemSpider
ECHA InfoCard 100.001.346
UNII
Properties
C29H50O
Molar mass 414.718 g·mol−1
Melting point 136 to 140 °C (277 to 284 °F; 409 to 413 K)[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

Natural occurrences and food

Beta-sitosterol is widely distributed in the plant kingdom and found in vegetable oil, nuts, avocados and prepared foods, such as salad dressings.[2]

Human research

β-sitosterol is being studied for its potential to reduce benign prostatic hyperplasia (BPH)[3][4] and blood cholesterol levels.[5]

Genetic disorder

While plant sterols are usually beneficial, there is a rare autosomal recessive genetic disorder phytosterolemia which causes over-absorption of phytosterols.[6]

Precursor of anabolic steroid boldenone

Being a steroid, β-sitosterol is a precursor of anabolic steroid boldenone. Boldenone undecylenate is commonly used in veterinary medicine to induce growth in cattle but it is also one of the most commonly abused anabolic steroids in sports. This led to suspicion that some athletes testing positive on boldenone undecylenate didn't actually abuse the hormone itself but consumed food rich in β-sitosterol.[7][8][9]

Chemistry

Chemical engineering

The use of sitosterol as a chemical intermediate was for many years limited due to the lack of a chemical point of attack on the side-chain that would permit its removal. Extensive efforts on the part of many laboratories eventually led to the discovery of a pseudomonas microbe that efficiently effected that transformation. Fermentation digests the entire aliphatic side-chain at carbon 17 to afford a mixture of 17-keto products including dehydroepiandrosterone.[10]

Synthesis

Total synthesis of β-sitosterol has not been achieved. However, β-sitosterol has been synthesized from stigmasterol 1, which involves a specific hydrogenation of the side-chain of stigmasterol.

The first step in the synthesis forms stigmasterol tosylate 2 from stigmasterol 1 (95% purity) using p-TsCl, DMAP, and pyridine (90% yield). The tosylate 2 then undergoes solvolysis as it is treated with pyridine and anhydrous MeOH to give a 5:1 ratio of i-stigmasterol methyl ether 3 (74% yield) to stigmasterol methyl ether 4, which is subsequently removed by chromatography. The hydrogenation step of a previously proposed synthesis involved the catalyst Pd/C and the solvent ethyl acetate. However, due to isomerisation during hydrolysis, other catalysts, such as PtO2, and solvents, such as ethanol, were tested. There was little change with the use of a different catalyst. Ethanol, however, prevented isomerisation and the formation of the unidentified impurity to give compound 5. The last step of the synthesis is deprotection of the β-ring double bond of 5 with p-TsOH, aqueous dioxane, and heat (80 °C) to yield β-sitosterol 6. The cumulative yield for the final two steps was 55%, and the total yield for the synthesis was 37%.[11]

Biosynthesis
Biosynthesis of β-sitosterol (6) from cycloartenol (7)

The regulation of the biosynthesis of both sterols and some specific lipids occurs during membrane biogenesis.[12] Through 13C-labeling patterns, it has been determined that both the mevalonate and deoxyxylulose pathways are involved in the formation of β-sitosterol.[13] The precise mechanism of β-sitosterol formation varies according to the organism, but is generally found to come from cycloartenol.[14]

The biosynthesis of cycloartenol begins as one molecule of isopentenyl diphosphate (IPP) and two molecules of dimethylallyl diphosphate (DMAPP) form farnesyl diphosphate (FPP). Two molecules of FPP are then joined tail-to-tail to yield squalene, a triterpene. Squalene, through a cyclization reaction with 2,3-oxidosqualene 6 as an intermediate forms cycloartenol.

The double bond of cycloartenol (compound 7 in diagram) is methylated by SAM to give a carbocation that undergoes a hydride shift and loses a proton to yield a compound with a methylene side-chain. Both of these steps are catalyzed by sterol C-24 methyltransferase (Step E1 in diagram). Compound 8 is then catalyzed by sterol C-4 demethylase (E2) and loses a methyl group to produce cycloeucalenol. Subsequent to this, the cyclopropane ring is opened with cycloeucalenol cycloisomerase (E3) to form 10. Compound 10 loses a methyl group and undergoes an allylic isomerization to form Gramisterol 11. This step is catalyzed by sterol C-14 demethylase (E4), sterol Δ14-reductase (E5), and sterol Δ8-Δ7-isomerase (E6). The last methyl group is removed by sterol demethylase (E7) to form episterol 12. Episterol 12 is methylated by SAM to produce a second carbocation, which loses a proton to yield 13. This step is catalyzed by 24-methylenesterol C-methyltransferase (E8). Compound 13 now undergoes reduction by NADPH and modifications in the β-ring to form β-sitosterol.

See also

References
  1. Oja, Vahur; Chen, Xu; Hajaligol, Mohammad R.; Chan, W. Geoffrey (2009). "Sublimation Thermodynamic Parameters for Cholesterol, Ergosterol, β-Sitosterol, and Stigmasterol". Journal of Chemical & Engineering Data. 54 (3): 730–734. doi:10.1021/je800395m.
  2. "Nutrition data: Foods highest in beta-sitosterol per 200 calorie serving". Conde Nast, USDA National Nutrient Database, version SR-21. 2014. Retrieved 25 September 2015.
  3. Wilt, T; Ishani, A; MacDonald, R; Stark, G; Mulrow, C; Lau, J (2000). "Beta-sitosterols for benign prostatic hyperplasia". The Cochrane Database of Systematic Reviews (2): CD001043. doi:10.1002/14651858.CD001043. PMID 10796740.
  4. Kim, T. H.; Lim, H. J.; Kim, M. S.; Lee, M. S. (2012). "Dietary supplements for benign prostatic hyperplasia: An overview of systematic reviews". Maturitas. 73 (3): 180–5. doi:10.1016/j.maturitas.2012.07.007. PMID 22883375.
  5. Rudkowska I, AbuMweis SS, Nicolle C, Jones PJ (2008). "Cholesterol-lowering efficacy of plant sterols in low-fat yogurt consumed as a snack or with a meal". J Am Coll Nutr. 27 (5): 588–95. doi:10.1080/07315724.2008.10719742. PMID 18845709.
  6. Patel Manoj D.; Thompson Paul D. (2006). "Phytosterols and Vascular Disease". Atherosclerosis. 186 (1): 12–19. doi:10.1016/j.atherosclerosis.2005.10.026. PMID 16325823.
  7. G. Gallina; G. Ferretti; R. Merlanti; C. Civitareale; F. Capolongo; R. Draisci; C. Montesissa (2007). "Boldenone, Boldione, and Milk Replacers in the Diet of Veal Calves: The Effects of Phytosterol Content on the Urinary Excretion of Boldenone Metabolites". J. Agric. Food Chem. 55 (20): 8275–8283. doi:10.1021/jf071097c. PMID 17844992.
  8. Ros MM, Sterk SS, Verhagen H, Stalenhoef AF, de Jong N (2007). "Phytosterol consumption and the anabolic steroid boldenone in humans: a hypothesis piloted" (PDF). Food Addit. Contam. 24 (7): 679–84. doi:10.1080/02652030701216727. PMID 17613052.
  9. R. Draisci; R. Merlanti; G. Ferretti; L. Fantozzi; C. Ferranti; F. Capolongo; S. Segato; C. Montesissa (2007). "Excretion profile of boldenone in urine of veal calves fed two different milk replacers". Analytica Chimica Acta. 586 (1–2): 171–176. doi:10.1016/j.aca.2007.01.026. PMID 17386709.
  10. Lenz, G. R.; Kirk-Othmer Encyclopedia of Chemical Technology, 3rd ed., Wiley Interscience, London, 1983, Vol. 21, 645.
  11. McCarthy, FO; Chopra, J; Ford, A; Hogan, SA; Kerry, JP; O'Brien, NM; Ryan, E; Maguire, AR (2005). "Synthesis, isolation and characterisation of beta-sitosterol and beta-sitosterol oxide derivatives". Organic & Biomolecular Chemistry. 3 (16): 3059–65. doi:10.1039/b505069c. PMID 16186940.
  12. Hartmann, Marie-Andrée (2003). "5 Sterol metabolism and functions in higher plants". Lipid Metabolism and Membrane Biogenesis. Topics in Current Genetics. 6. pp. 183–211. doi:10.1007/978-3-540-40999-1_6. ISBN 978-3-540-20752-8.
  13. De-Eknamkul W.; Potduang B. (2003). "Biosynthesis of β-Sitosterol and Stigmasterol in Croton sublyratus Proceeds Via a Mixed Origin of Isoprene Units". Phytochemistry. 62 (3): 389–398. doi:10.1016/S0031-9422(02)00555-1. PMID 12620352.
  14. Dewick, P. M. Medicinal Natural Products: A Biosynthetic Approach. 3 ed.; John Wiley & Sons Ltd.: United Kingdom cyclization, 2009; p 539.
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