Add time:07/11/2019         Source:sciencedirect.com

Positional isomers of aliphatic keto carboxylic acids (C6C15) in marine aerosol samples collected in the North Pacific Ocean have been identified by using capillary gas chromatography—mass spectrometry (GC—MS). The keto group was determined to be in the γ- to (ω — 1)-position. These keto acids were isolated from aerosol filters by extraction with methanolic potassium hydroxide and derivatized to their corresponding methyl esters. The keto acid methyl esters were purified by silica gel column chromatography prior to GC and GC—MS analysis. The results showed that 5-oxoundecanoic, IO-oxoundecanoic, 5-oxononanoic, 4-oxononanoic, 8-oxoundecanoic and 9-oxoundecanoic acids were dominant keto acids in the marine aerosol samples studied. This paper presents the structural identification of the positional isomers of aliphatic keto acid methyl esters by electron-impact mass spectrometry.

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