alpha-Eleostearic acid

α-Eleostearic acid

Names
IUPAC name (9Z,11E,13E)-Octadeca-9,11,13-trienoic acid
Identifiers
CAS Number	506-23-0
ChEBI	CHEBI:10275
ChemSpider	4444560
Jmol interactive 3D	Image
InChI InChI=1S/C18H30O2/c1-2-3-4-5-6-7-8-9-10-11-12-13-14-15-16-17-18(19)20/h5-10H,2-4,11-17H2,1H3,(H,19,20)/b6-5+,8-7+,10-9- Key: CUXYLFPMQMFGPL-WPOADVJFSA-N InChI=1/C18H30O2/c1-2-3-4-5-6-7-8-9-10-11-12-13-14-15-16-17-18(19)20/h5-10H,2-4,11-17H2,1H3,(H,19,20)/b6-5+,8-7+,10-9-
SMILES O=C(O)CCCCCCC/C=C\C=C\C=C\CCCC
Properties
Chemical formula	C18H30O2
Molar mass	278.43 g/mol
Melting point	48 °C (118 °F; 321 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

α-Eleostearic acid or (9Z,11E,13E)-octadeca-9,11,13-trienoic acid, is an organic compound, a conjugated fatty acid and one of the isomers of octadecatrienoic acid. It is often called simply eleostearic acid although there is also a β-eleostearic acid (the all-trans or (9E,11E,13E) isomer). Its high degree of unsaturation gives tung oil its properties as a drying oil.

Biochemical properties

α-Eleostearic acid makes up about 60% of the fatty acids from bitter gourd oil.

In their pioneering work on essential fatty acids, Burr, Burr and Miller compared the nutritional properties of α-eleostearic acid (ELA) to that of its isomer alpha-linolenic acid (ALA). ALA relieved essential fatty acid deficiency; ELA did not.^[1]

In rats, α-eleostearic acid is converted to a conjugated linoleic acid.^[2] The compound has been found to induce programmed cell death of fat cells,^[3] and of HL60 leukemia cells in vitro at a concentration of 20 μM.^[4] Diets containing 0.01% bitter gourd seed oil (0.006% as α-eleostearic acid) were found to prevent azoxymethane-induced colon carcinogenesis in rats.^[5]

Sources

α-Eleostearic acid is found in the oils extracted from seeds. Tung oil has 82% α-Eleostearic acid. bitter gourd seed oil has 60% α-Eleostearic acid.

See also

15,16-Dihydroxy-alpha-eleostearic acid

References

1. Burr, G.O.; Burr, M.M.; Miller, E. (1932). "On the nature and role of the fatty acids essential in nutrition" (PDF). J. Biol. Chem. 97 (1): 1–9. Retrieved 2007-01-17.
2. Tsuzuki T, Kawakami Y, Abe R; et al. (1 August 2006). "Conjugated linolenic acid is slowly absorbed in rat intestine, but quickly converted to conjugated linoleic acid". J Nutr 136 (8): 2153–9. PMID 16857834. Retrieved 2007-01-17.
3. Nishimura K, Tsumagari H, Morioka A, Yamauchi Y, Miyashita K, Lu S, Jisaka M, Nagaya T, Yokota K (2002). "Regulation of apoptosis through arachidonate cascade in mammalian cells". Appl Biochem Biotechnol. 102-103 (1-6): 239–50. doi:10.1385/ABAB:102-103:1-6:239. PMID 12396127.
4. Masuko Kobori, Mayumi Ohnishi-Kameyama, Yukari Akimoto, Chizuko Yukizaki and Mitsuru Yoshida (2008) α-Eleostearic Acid and Its Dihydroxy Derivative Are Major Apoptosis-Inducing Components of Bitter Gourd. Journal of Agricultural and Food Chemistry, volume 56, issue 22, pages 10515–10520. doi:10.1021/jf8020877
5. H. Kohno, Y. Yasui, R. Suzuki, M. Hosokawa, K. Miyashita, T. Tanaka (2004), Dietary seed oil rich in conjugated linolenic acid from bitter melon inhibits azoxymethane-induced rat colon carcinogenesis through elevation of colonic PPAR γ expression and alteration of lipid composition. International Journal of Cancer, volume 110, pages 896–901.