Phytosterol

phytosterol

[fī′täs·tə‚rȯl] (biochemistry) Any of various sterols obtained from plants, including ergosterol and stigmasterol.

Phytosterol

a plant sterol released from the unsaponified parts of plant lipides. In contrast to animal sterols, such as cholesterol, the side chain in phytosterols is unsaturated and contains not eight carbon atoms but nine or ten. Most phytosterols are optically active crystalline substances with physical and chemical properties similar to those of other sterols.

The most common phytosterols include (β-sitosterol (C₂₉H₅₀O) and stigmasterol (C₂₉H₄₈O), which are released by cotton-seed, soybean, and other oils and from the by-products of the sulfate process in the cellulose industry. Isomers of stigmasterol are α-spinasterol (from spinach), fucosterol (from fungi), brassicasterol (C₂₈H₄₆O; from cabbage), and campesterol (C₂₈H₄₈O; from cabbage). Ergosterol is also a phytosterol.

Phytosterols are found in plants in free form, as well as in compounds with carbohydrates or fatty acids or with both. In some plants, β-sitosterol, like cholesterol, serves as the precursor to progesterone. Stigmasterol serves as a vitamin for guinea pigs (antiankylosis factor). Phytosterols also include certain C₂₈ and C₂₉ sterols from ferns and conifers that induce molting in insects (ecdysones).

Phytosterols are used in the pharmaceutical industry for the synthesis of steroid preparations.

REFERENCES

Heftman, E. Biokhimiia steroidov. Moscow, 1972. (Translated from English.)
Heftmann, E. “Biochemistry of Plant Steroids.” Annual Review of Plant Physiology, 1963, vol. 14.
Bean, G. A. “Phytosterols.” Advances in Lipid Research, 1973, vol. 11.

E. P. SEREBRIAKOV

单词	phytosterol
释义	phytosterol phy·to·ster·ol P5306050 (fī′tō-stîr′ôl′, -ōl′, -stĕr′-)n. Any of various sterols, such as stigmasterol, that are derived from plants. phytosterol (faɪˈtɒstərɒl) n (Pharmacology) pharmacol a type of chemical that occurs naturally in plants, used esp in food additives, medicine and cosmetics Phytosterol phytosterol [fī′täs·tə‚rȯl] (biochemistry) Any of various sterols obtained from plants, including ergosterol and stigmasterol. Phytosterol a plant sterol released from the unsaponified parts of plant lipides. In contrast to animal sterols, such as cholesterol, the side chain in phytosterols is unsaturated and contains not eight carbon atoms but nine or ten. Most phytosterols are optically active crystalline substances with physical and chemical properties similar to those of other sterols. The most common phytosterols include (β-sitosterol (C₂₉H₅₀O) and stigmasterol (C₂₉H₄₈O), which are released by cotton-seed, soybean, and other oils and from the by-products of the sulfate process in the cellulose industry. Isomers of stigmasterol are α-spinasterol (from spinach), fucosterol (from fungi), brassicasterol (C₂₈H₄₆O; from cabbage), and campesterol (C₂₈H₄₈O; from cabbage). Ergosterol is also a phytosterol. Phytosterols are found in plants in free form, as well as in compounds with carbohydrates or fatty acids or with both. In some plants, β-sitosterol, like cholesterol, serves as the precursor to progesterone. Stigmasterol serves as a vitamin for guinea pigs (antiankylosis factor). Phytosterols also include certain C₂₈ and C₂₉ sterols from ferns and conifers that induce molting in insects (ecdysones). Phytosterols are used in the pharmaceutical industry for the synthesis of steroid preparations. REFERENCES Heftman, E. Biokhimiia steroidov. Moscow, 1972. (Translated from English.) Heftmann, E. “Biochemistry of Plant Steroids.” Annual Review of Plant Physiology, 1963, vol. 14. Bean, G. A. “Phytosterols.” Advances in Lipid Research, 1973, vol. 11. E. P. SEREBRIAKOV phytosterol phytosterol [fi″to-ste´rol] a sterol of vegetable origin. phy·to·ste·rol (fi'tō-stē'rol), Generic term for the sterols of plants. phytosterol (fī′tō-stîr′ôl′, -ōl′, -stĕr′-)n. Any of various sterols, such as stigmasterol, that are derived from plants. phytosterol A generic term for cholesterol-like compounds of plant origin, which include plant sterols and stanols. Alternative medicine It is alleged that phytosterols reduce the risk of cardiovascular disease due to their ability to reduce serum cholesterol levels; however, there are few peer-reviewed reports that support this allegation.
随便看	germ layer germ layers germ layer theory germ-layer theory germless germ-like germ line germ-line germline germ line cell germ line cells germ-line gene therapy germline mutation germ lines germline specific rna binding protein germline stem cell germ line transmission germ membrane germ nucleus germny germogen genus tomistoma genus toona genus torreya genus tortrix

phytosterol

phy·to·ster·ol

phytosterol

Phytosterol

phytosterol

Phytosterol

REFERENCES

phytosterol

phytosterol

phy·to·ste·rol

phytosterol

phytosterol