scholarly journals Determination of some short chain carboxylic acids in food by headspace gas chromatography

Chemija ◽  
2018 ◽  
Vol 29 (3) ◽  
Author(s):  
Birutė Bugelytė ◽  
Rima Jonkutė ◽  
Vida Vičkačkaitė
Keyword(s):  
Chromatographic Analysis ◽  
Aqueous Media ◽  
Single Step ◽  
Bakery Products ◽  
Headspace Gas Chromatography ◽  
Tomato Paste ◽  
Suggested Technique ◽  
Headspace Extraction ◽  
Headspace Gas

Headspace gas chromatographic analysis is suggested for the determination of acetic and propionic acids in aqueous media. Derivatization of the acids was accomplished by tributyl borate. The derivatization and headspace extraction were coupled into a single step. Analytical characteristics of the suggested technique at the optimized derivatization/headspace extraction conditions were determined. The technique was applied for the analysis of bakery products, ketchup, tomato paste and kefir.

scholarly journals Gas chromatographic determination of some carboxylic acids: comparison between solution and headspace analysis

Chemija ◽  
2019 ◽  
Vol 30 (4) ◽  
Author(s):  
Birutė Bugelytė ◽  
Karolina Ilonina ◽  
Vilius Poškus ◽  
Vida Vičkačkaitė
Keyword(s):  
Gas Chromatography ◽  
Carboxylic Acids ◽  
Chromatographic Analysis ◽  
Headspace Analysis ◽  
Chromatographic Determination ◽  
The Other ◽  
Headspace Gas Chromatography ◽  
Solid Samples ◽  
Headspace Gas

Direct and headspace gas chromatographic analysis is compared for the determination of lactic, oxalic, succinic, malic and citric acids. For better chromatographic behaviour, prior to GC analysis carboxylic acids were derivatized using BSTFA as a silylation reagent. Three solvents – acetone, diethyl ether and dimethylformamide – were tested as a derivatization medium and DMF was considered as the best. Derivatization conditions were optimized and analytical characteristics of the direct gas chromatographic determination of analytes in solutions were determined. The method was applied for the determination of citric acid in food. For the analytes dissolved in DMF, the headspace gas chromatographic determination was not sensitive enough. Concentrations of the derivates in the headspace were very low, thus the limits of detection were high and the method was not of practical use. On the other hand, headspace gas chromatography can be applied for identifying of carboxylic acids in solid samples.

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