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NMR spectroscopy was used to distinguish pure sunflower lecithin from that blended with soy species, and to quantify the degree of such adulteration. Sample preparation included liquid extraction of lecithin blends and measurement of polar and non-polar fractions using 31P and 1H NMR spectrometry. Several phospholipid species, linolenic acid and stachyose were found to be characteristic for sunflower...
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