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Kempton, South Africa

Vos J.D.,National Metrology Institute of South Africa | Quinn L.,National Metrology Institute of South Africa | Roos C.,North West University South Africa | Pieters R.,North West University South Africa | And 7 more authors.
TrAC - Trends in Analytical Chemistry | Year: 2013

We outline the experiences and the challenges of optimizing two-dimensional gas chromatography coupled with time-of-flight mass spectrometry (GCxGC-TOF-MS) in conjunction with the H4IIE-. luc bio-assay for analyzing polychlorinated dibenzo-. p-dioxins (PCDDs) and polychlorinated dibenzofurans (PCDFs) in the South African context. Investigating such alternative analytical methods can assist countries with developing economies to meet their obligations under the Stockholm Convention. © 2013 Elsevier Ltd.

Fanali S.,National Research Council Italy | D'Orazio G.,National Research Council Italy | Lomsadze K.,Separation Science Laboratory | Samakashvili S.,Separation Science Laboratory | Chankvetadze B.,Separation Science Laboratory
Journal of Chromatography A | Year: 2010

Amylose tris(5-chloro-2-methylphenylcarbamate) was coated onto native and aminopropylsilanized silica in order to prepare chiral stationary phases (CSP) for enantioseparations using nano-liquid chromatography (nano-LC) and capillary electrochromatography (CEC). The effect of the nature of silica, the particle size and pore diameter, the chiral selector loading onto silica, the mobile phase composition and pH, as well as separation variables such as a linear flow rate of the mobile phase, applied voltage in CEC, etc. on the separation of enantiomers was studied. It was found that CSPs based on amylose tris(5-chloro-2-methylphenylcarbamate) can be used for preparation of stable capillary columns for enantioseparations by nano-LC and CEC in combination with polar organic and aqueous-organic mobile phases. Higher peak efficiency was observed in CEC than in nano-LC. © 2009 Elsevier B.V. All rights reserved.

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