Determination of nicotine in tobacco with second-order spectra data of charge-transfer complex in ethanol–water binary solvents processed by parallel factor analysis
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- 作者：Shuqin Gao ; Lifu Liao ; Xilin Xiao ; Zhiyuan Zhao ; Nan Du ; Jiangfeng Du
- 关键词：Nicotine ; Parallel factor analysis ; Charge-transfer ; Visible absorption spectra ; Ethanol– ; water binary solvent
- 刊名：Spectrochimica Acta Part A: Molecular and Biomolecular Spectroscopy
- 出版年：2010
- 出版时间：May 2010
- 年：2010
- 卷：75
- 期：5
- 页码：1540-1545
- 全文大小：294 K
文摘
A new spectrophotometric method for the determination of nicotine in mixtures without pre-separation has been proposed. Nicotine could react with 2,4-dinitrophenol through a charge-transfer reaction to form a colored complex. The second-order data from the visible absorption spectra of the complex in a series of ethanol–water binary solvents with various water volume fractions could be expressed as the combination of two bilinear data matrices. With the bilinear model, the second-order spectra data of mixtures containing nicotine and other interferents could be analysed by using second-order calibration algorithms, and the determination of nicotine in the mixtures could be achieved. The algorithm used here was parallel factor analysis. The method has been successfully used to determine nicotine in tobacco samples with satisfactory results.