Determination of lecithin and soybean oil in dietary supplements using partial least squares-Fourier transform infrared spectroscopy |
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Authors: | Kuligowski J Quintás G Garrigues S de la Guardia M |
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Affiliation: | Department of Analytical Chemistry, Universitat de València, Edificio Jeroni Muñoz, 50th Dr. Moliner, 46100 Burjassot, Spain |
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Abstract: | Lecithin and soybean oil in dietary supplements were determined by Fourier transform infrared spectrometry transmission measurements in dichloromethane in combination with a partial least squares (PLS) regression. Two different PLS models were developed, using 16 synthetic mixtures of analytes in dichloromethane, making measurements in the spectral range from 931.8 to 1252.3 cm−1 for lecithin and from 911.4 to 1246.9 cm−1 and 1695.3 to 1774.5 cm−1 for soybean oil. Seven products from the Spanish market with lecithin concentrations between 21.1% and 99.1% and soybean oil concentrations between 0% and 37.2% were analyzed by the proposed method and the data was compared to a chromatographic reference procedure obtaining accurate results. For samples spiked with amounts between 50 and 250 mg of lecithin and soybean oil recovery percentages between 98.0% and 102.1% and between 93.6% and 102.0% with an average precision of 0.35% and 0.41% were achieved for lecithin and soybean oil, respectively. This method can be applied for the quality control of dietary supplements. |
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Keywords: | Partial least squares Fourier transform infrared spectroscopy Lecithin Soybean oil Dietary supplement analysis |
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