« Previous Abstract"Evaluating Exposure to VOCs and Naphthalene for Firefighters Wearing Different PPE Configurations through Measures in Air, Exhaled Breath, and Urine"    Next AbstractAttraction of adult Rhagoletis indifferens (Diptera: Tephritidae) to unbaited and odor-baited red spheres and yellow rectangles »

Analyst

Title:		"A 50% n-octylmethyl, 50% diphenyl-polysiloxane as stationary phase with unique selectivity for gas chromatography"
Author(s):		Mayer BX; Kahlig H; Rauter W;
Address:		"Department of Clinical Pharmacology, University School of Medicine, Vienna University, Wahringer Gurtel 18-20, 1090 Vienna, Austria. Bernhard.Mayer@univie.ac.at"
Journal Title:		Analyst
Year:		2003
Volume:		20030923
Issue:		10
Page Number:		1238 - 1242
DOI:		10.1039/b309476f
ISSN/ISBN:		0003-2654 (Print) 0003-2654 (Linking)
Abstract:		"An n-octylmethyl, diphenyl-polysiloxane called SOP-50-Octyl was prepared by a condensation reaction of bis(dimethylamino) n-octylmethylsilane with diphenylsilanediol. The resulting copolymer was a gum with high molecular weight and was obtained with a yield of 80%. 1H and 29Si NMR spectroscopy revealed that the copolymer was a 52% octylmethyl, 48% diphenyl-polysiloxane with random microstructure. Small cyclic impurities could be almost quantitatively removed via a purification step. SOP-50-Octyl was used as stationary phase for the preparation of wall coated open tubular fused silica capillary columns for gas-liquid chromatography. The capillary columns exhibited high separation efficiency and high inertness. The stationary phase offered a unique selectivity due to its unique composition. The Rohrschneider-McReynolds constants indicated a low overall polarity in spite of the high phenyl content, as the polarity was distinctly decreased by the octyl substituent. Furthermore, the octyl substituent was responsible for a high column bleed, reducing the maximum allowable operating temperature to 280 degrees C. The elution temperatures of apolar compounds were increased due to increased interaction of the octyl substituent with the analytes. Some applications with volatile and semi-volatile organic compounds illustrate that SOP-50-Octyl is an excellent choice for confirmational analyses"
Keywords:		"Chromatography, Gas/*methods Magnetic Resonance Spectroscopy/methods Pharmaceutical Preparations/chemistry Polymers/analysis/*chemical synthesis;"
Notes:		"MedlineMayer, Bernhard X Kahlig, Hanspeter Rauter, Walfried eng England 2003/12/12 Analyst. 2003 Oct; 128(10):1238-42. doi: 10.1039/b309476f. Epub 2003 Sep 23"