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1. Chaos entropy index combined with linear discriminant analysis for identification of hogwash oil | |||
ZHENG Wenjun,CHEN Lin,WANG Xin,FANG Xiaowei,CHEN Huanwen | |||
Chemistry 04 June 2012 | |||
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Abstract:Based on surface desorption atmospheric pressure chemical ionization mass spectrometry (DAPCI-MS), a new method for identifying mixtures without pronounced characteristic markers was proposed and applied to hogwash oil's recognition. The chaos level of MS spectrograms for 33 oil samples was calculated using the new proposed concept: chaos entropy index (CEI) and the results were subjected to stepwise linear discriminant analysis (LDA). For the first time, total peaks' chaos level was treated as a criterion for identification of mixtures, which effectively avoided high misjudgment-rate problems commonly existed in traditional physical and chemical inspections. Discrimination model built by stepwise LDA based on the 5 selected parameters (101-200 m/z, 201-300 m/z, 301-400 m/z, 401-500 m/z, 501-600 m/z) achieved 100% classification in leave-1/10-out cross-validation. The oil study presented here demonstrated that CEI combined with LDA is an effective way for the identification of hogwash oils and this new method is of great significance for analyzing other complex mixtures without characteristic markers. | |||
TO cite this article:ZHENG Wenjun,CHEN Lin,WANG Xin, et al. Chaos entropy index combined with linear discriminant analysis for identification of hogwash oil[OL].[ 4 June 2012] http://en.paper.edu.cn/en_releasepaper/content/4481056 |
2. Simultaneous separation and validation of benzoic acid compounds by capillary electrophoresis | |||
Gao Suya ,Li Ting ,Li Hua | |||
Chemistry 19 March 2010 | |||
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Abstract:A simple and inexpensive capillary electrophoresis (CE) was applied to separate six benzoic acid compounds with similar structure. The investigation was carried out by capillary zone electrophoresis (CZE) and micellar electrokinetic capillary chromatography (MECC). To avoid a time-consuming and tedious procedure, orthogonal experimental design for separation experiments was applied to find the optimal conditions in terms of the resolution and analytical time. The best conditions for separation were obtained using a 20 mM borax and 30 mM sodium dodecyl sulfate (SDS) buffer (pH9.8) containing 2 mM β-CD and 4% methanol (volume fraction). Online UV detection was performed at 250 nm. A voltage of 16 kV was applied and the temperature was controlled at 21℃. Gravity injection was performed for 5 s. The method was validated for the quantification of benzoic acid and salicylic acid in Zuguangsan powder, a traditional Chinese patent medicine. The separation and determination were satisfactory, quick and reliable. | |||
TO cite this article:Gao Suya ,Li Ting ,Li Hua . Simultaneous separation and validation of benzoic acid compounds by capillary electrophoresis[OL].[19 March 2010] http://en.paper.edu.cn/en_releasepaper/content/40889 |
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