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J Chromatogr A

Title:		Design and application of Hadamard-injectors coupled with gas and supercritical fluid sample collection systems in Hadamard transform-gas chromatography/mass spectrometry
Author(s):		Fan Z; Lin CH; Chang HW; Kaneta T; Lin CH;
Address:		"Department of Chemistry, National Taiwan Normal University, 88 Sec. 4, Tingchow Road, Taipei, Taiwan"
Journal Title:		J Chromatogr A
Year:		2010
Volume:		20091204
Issue:		5
Page Number:		755 - 760
DOI:		10.1016/j.chroma.2009.12.007
ISSN/ISBN:		1873-3778 (Electronic) 0021-9673 (Linking)
Abstract:		"A novel Hadamard transform-gas chromatography/mass spectrometry (HT-GC/MS) system equipped with on-line sample collection systems is described. A Hadamard-injector was successfully designed and then coupled with an on-line adsorption/desorption system for detecting volatile organic compounds (VOCs) and a supercritical fluid extraction (SFE) system, respectively, by HT-GC/MS. Six VOCs and three pesticides were used as model compounds. In the former case, an activated-charcoal trap was used to trap VOCs from the indoor air. After 10L of indoor air had passed through the trap, the condensed components were heated and simultaneously injected into the GC column through the Hadamard-injector, based on Hadamard codes. In a second experiment, a sample of rice was spiked with three types of pesticides and the sample then extracted using a commercially available supercritical fluid extractor. After extraction, the extracted components were transferred to a holding tank and simultaneously injected into the GC column also using the Hadamard-injector. The findings show that, in both cases, the combination of on-line sample collection methods and the use of the Hadamard transform resulted in improved sensitivity and detection. Compared to the single injection used in most GC/MS systems, the signal-to-noise (S/N) ratios were substantially improved after inverse Hadamard transformation of the encoded chromatogram"
Keywords:		"Chromatography, Supercritical Fluid/*instrumentation/*methods Equipment Design *Fourier Analysis Gas Chromatography-Mass Spectrometry/*instrumentation/*methods Sensitivity and Specificity Volatile Organic Compounds/*analysis;"
Notes:		"MedlineFan, Zenzen Lin, Chien-Hung Chang, Hung-Wei Kaneta, Takashi Lin, Cheng-Huang eng Research Support, Non-U.S. Gov't Netherlands 2009/12/22 J Chromatogr A. 2010 Jan 29; 1217(5):755-60. doi: 10.1016/j.chroma.2009.12.007. Epub 2009 Dec 4"