Analytical Chemistry p. 1126 - 1130 (1985)
Update date:2022-09-26
Topics:
Hassan, Saad S. M.
Ahmed, Mona A.
Saoudi, Moshera M.
A liquid membrane electrode for caffeine prepared from a solution of caffeine-picrylsulfonate ion-pair complex in 1-octanol is developed.It exhibits Nernstian response in the range of 10-2-10-6 M caffeine with a cationic slope of 59 mV/concentration decade.The electrode has a wide working pH range <5.5-9.5>, fast response time <20 s to 1.5 min>, stable response for at least 30 days, and high selectivity for caffeine in the presence of many organic bases.The results obtained for quantitation of 1-1000 μg mL-1 of caffeine show an average recovery of 99.5percent and a mean standard deviation of 1.3percent.Determination of caffeine in some analgesic preparations gives results in good agreement with those obtained by the United States Pharmacopoela method.
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