Glass capillary gas chromatography–alkali flame ionization detection at high temperatures. Direct analysis of free base petroporphyrins

Columns: Packed and Capillary; Column Selection in Gas Chromatography

“…As the term suggests, an actual chemical bond is formed between fused silica and the stationary phase. The foundation of this procedure was first reported by Lipsky and McMurray (144) in their investigation of hydroxy-terminated polymethylsilicones and was later refined by the work of Blum et al (145)(146)(147)(148)(149), who employed OH-terminated phases for the preparation of inert, high-temperature stationary phases of varying polarities. The performance of hydroxy-terminated phases has also been evaluated by Schmid and Mueller (150) and Welsch and Teichmann (151).…”

A Novel Synthesis of Branched High-molecular-weight (C40+) Long-chain Alkanes

“…Conven-tional analytical methods such as NMR, FT-IR and a combustion analysis fail to detect even signiˆcant impurities of higher homologs and are therefore only of limited value for the characterization of homologous alkanes. HTGC has been extensively used to analyze petroporphyrins [35][36][37] and natural wax mixtures. 4,6,38,39) We successfully used HTGC to analyze the purity of synthetic alkanes 2 in this study.…”

Estado da arte da cromatografia gasosa de alta resolução e alta temperatura

“…A aplicabilidade da CGAR-AT inclui a análise de lipídeos 28 , n-alcanos até C 100 29 , triglicerídeos [30][31] , oligosacarídeos [32][33] , oligômeros de resinas 34 , porfirinas [35][36][37][38] , produtos naturais [39][40] , ciclodextrinas 41 e outros tipos de amostras 42 . Outros tipos de cromatografia gasosa a altas temperaturas, como a cromatografia "on-line" de elementos químicos como tálio utilizando colunas de quartzo ou platina a temperaturas de até 1000 o C 43 , não são consideradas como sendo CGAR-AT.…”