Extractive Freezing-out of Caffeine from Aqueous Solutions in a Centrifugal Force Field

The effect of the pH of the medium, the volume ratio of the extractant to water on the efficiency of caffeine extraction with acetonitrile from aqueous solutions by extractive freezing-out in a centrifugal force field is studied. The results can be explained in terms of the previously proposed theor...

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Bibliographic Details
Published in:Journal of analytical chemistry (New York, N.Y.) N.Y.), 2020-09, Vol.75 (9), p.1103-1107
Main Author: Bekhterev, V. N.
Format: Article
Language:English
Subjects:
Acetonitrile
Analytical Chemistry
Aqueous solutions
Caffeine
Centrifugal force
Chemistry
Chemistry and Materials Science
Freezing
Nitriles
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Summary:The effect of the pH of the medium, the volume ratio of the extractant to water on the efficiency of caffeine extraction with acetonitrile from aqueous solutions by extractive freezing-out in a centrifugal force field is studied. The results can be explained in terms of the previously proposed theoretical process model. The highest recovery of caffeine was achieved at pH 6–7. The limit of determination of caffeine in water is 0.015 μg/mL.
ISSN:1061-9348
1608-3199
DOI:10.1134/S1061934820090051