期刊
TALANTA
卷 77, 期 1, 页码 229-234出版社
ELSEVIER
DOI: 10.1016/j.talanta.2008.06.029
关键词
Partial least squares; Fourier transform infrared spectroscopy; Lecithin; Soybean oil; Dietary supplement analysis
资金
- Ministerio de Educacion y Ciencia [CTQ205-05604]
- Direccio General d'Investigacio I Transferencia Tecnologica de la Generalitat Valenciana [ACOMP/2007/131]
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. (c) 2008 Elsevier B.V. All rights reserved.
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