Abstract
The method of flash exchange to form esters of organic acids for gas chromatography has been modified for use with argon ionization detectors and extended to include organic acids of carbon content through C18. An aliquot of a mixture of potassium (or sodium) salts of organic acids and potassium ethyl sulfate in water is drawn into a hypodermic needle containing diatomaceous earth. The water is removed by warming the mixture in the needle in a convection oven at 100°. The needle is connected to a source of argon (15 p.s.i.g.) and then inserted into a pre-heated (275°) section of the gas chromatography column. As the exchange reactions to form ethyl esters take place, the products are swept into the column by the argon gas stream. Chromatograms of the esters contain sharp, well-separated peaks. Use of the method to confirm the identity of organic acids in fermented liquors used in bread production is described.
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