High Performance Liquid Chromatographic Analysis of Soybean Phospholipids

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<jats:title>Abstract</jats:title><jats:p>An HPLC method was optimized to analyze soybean phospholipids. It uses a silica column with UV detection at 210 nm, and a mobile phase consisting of hexane, isopropanol and water. Separation is achieved by keeping the hexane to isopropanol ratio constant and varying the water concentration in a gradient elution program. Components in the HPLC chromatogram were identified by comparison with retention times of authentic compounds. The method was quantitative for phosphatidylcholine (PC), phosphatidylethanolamine (PE), phosphatidylinositol (PI), and lyso‐phosphatidylcholine (LPC). To determine these components quantitatively, standard curves of authentic compounds were prepared. The peak area of the compound in the mixture was converted into weight percent with the standard curves. Unsaturation was the functional group measured by the detector, therefore, the accuracy of the quantitative results depended upon the degree of unsaturation in the standard compounds. Unsaturation in triglycerides and phospholipids may vary depending upon the season of harvest and the climate of location and production. Two commercial samples of granular soybean lecithin were analyzed. Soybean lecithin was extracted with alcohol and the alcohol‐soluble and alcohol‐insoluble fractions were analyzed. The results differed both qualitatively and quantitatively.</jats:p>

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