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|標題:||Determination of theophylline in tea and drug formulation using a Nafion (R)/lead-ruthenium oxide pyrochlore chemically modified electrode|
|期刊/報告no：:||Talanta, Volume 50, Issue 3, Page(s) 635-640.|
|摘要:||Square-wave voltammetry was used for the determination of trace amounts of theophylline in tea and drug formulation at a Nafion(R)/lead-ruthenium oxide pyrochlore chemically modified electrode. This chemically modified electrode exhibits a marked enhancement of the current response compared to a bare glassy carbon electrode. The calibration graph for the determination of theophylline was linear up to 100 mu M in 0.1 M, pH 3 phosphate solution with a detection limit (S/N = 3) of 0.1 mu M. The results of 15 successive repetitive measurement-regeneration cycles showed a relative standard deviation of 1.3% for 10 mu M theophylline indicating that the electrode renewal gives a good reproducible surface. Quantitative analysis was performed by the standard addition method for the theophylline content in commercially available tea and drug. (C) 1999 Elsevier Science B.V. All rights reserved.|
|Appears in Collections:||化學系所|
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