Showing papers on "Campesterol published in 1994"

Isolation and identification of steryl cinnamic acid derivatives from corn bran

Abstract: Esters of sterols and cinnamic acid derivatives (CAD) comprise a group of compounds found in seeds of, among others, corn, wheat, rye, triticale, and rice. They have been implicated in lowering blood lipid levels. Related compounds are antioxidants and others inhibit fungal spore germination. To obtain pure compounds for bioactivity studies with corn insects and kernel-rotting fungi, an improved method of separating these compounds was developed. A high-performance liquid chromatography method, using a mixture of acetonitrile, n-butanol, acetic acid, and water (94:3:2:1, v/v), improved the resolution of steryl esters of CAD isolated from corn bran, which shows that this group of compounds is at least twice as complex as was previously reported. A simple method for hydrolysis and joint determination of the CAD and sterol portions of the ester is described. A total of 16 compounds that appear to be steryl CAD are reported along with relative retention times and composition percentages. Sitosteryl, sitostanyl, stigmasteryl, campesteryl, campestanyl and DELTA-7-sitosteryl, and DELTA-7-campesteryl ferulates were identified in corn bran. Mass spectrometry data for the trimethylsilyl derivatives of the sterols esterified to ferulic and p-coumaric acids are given. In addition to known p-coumarates, campesterol and DELTA-7-campestenol forms were also found.

Fatty acid and sterol composition from seeds of some Lathyrus ecotypes

Abstract: Fatty acids (FA) and sterol distribution in the Lathyrus sativus L. (chickling vetch) and Lathyrus cicera L. (bitter vetch) seeds was determined. The distribution of FA showed that unsaturated (UFA) were predominant to saturated (SFA). In all samples oleic acid predominates between UFA while stearic acid is the most abundant SFA. The sitosterol was the major sterol accompanied by stigmasterol and campesterol

Components of Pine Seed Lipids

Abstract: Lipids extracted from three pine seeds, Pinus koraiensis, Pinus armandi and Pinus cembra, were studied for general properties, fatty acid, sterol, phospholipids, and tocopherol content and autoxidation by the AOM test.All the lipids contained 14.718.6 % of Δ cis-5, cis-9, cis-12-octadecatrienoic acid (Δ 5, 9, 12-18 : 3 and designated here tentatively as pinolenic acid). The content of this acid in polar lipids was considerably less than in neutral lipids. The content of pinolenic acid in 2-monoacylglycerol was very low (1.22.6 %) and was thus considered distributed mainly at the 1, 3-position.Sterol composition consisted of three sterols, sitosterol, Δ 5-avenasterol and campesterol. Total sterol content of lipid extracted from P. armandi seeds was higher than that in the other two species.Phosphatidylcholine (PC), phosphatidyl ethanolamine (PE) and phosphatidylinositol (PI) were present as the major phospholipids.Total tocopherol content in pine seed lipids was less than in vegetable oils having high iodine value such as soybean oil and safflower oil. Oxidative stability by the AOM test was essentially the same as that of the above vegetable oils.

Identificazione di idrocarburi di neoformazione negli oli vegetali raffinati per mezzo della GC-MS

Abstract: In refined vegetable oils there are some hydrocarbons obtained by dehydration of the sterolic compounds. In recent pubblications the stigmasta-3,5-diene, campesta-3,5-diene and stfgmasta-3,5,22-triene have been identified. These compounds have been obtained from β-sitosterol, campesterol, and stigmasterol. By the use of gascromathography and mass spectrometry we have identified three new hydrocarbons: stigmasta-2,4-diene, stigmasta-4,6-diene and stigmasta-2,4,6-triene obtained by isomerizzation of stigmasta-3,5-diene with heterogenic acid catalysis