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Analytical and Bioanalytical Electrochemistry، جلد ۱۶، شماره ۱۲، صفحات ۱۰۴۶-۱۰۵۹
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عنوان انگلیسی Simultaneous Determination of Caffeine, Theobromine, and Theophylline in Tea by Differential Pulse Adsorptive Stripping Voltammetry Combined with Chemometrics
چکیده انگلیسی مقاله Adsorptive stripping voltammetry (AdSV) using a glassy carbon electrode combined with chemometrics was investigated for simultaneous determination of caffeine, theobromine, and theophylline in tea samples, offering high selectivity, sensitivity, simplicity, and cost-effectiveness. The optimal electrochemical conditions were 0.01 mol.L-1 H2SO4, an adsorption potential of 0.6V vs. Ag/AgCl/KCl, a scan rate of 0.025 V/s, and an adsorption time of 60 s. Linear calibration graphs for each compound were obtained in the concentration ranges from 1.0×10-6 to 4.0×10-5 mol.L-1, 1.0×10-6 to 3.0×10-5 mol.L-1, and 1.0×10-6 to 1.4×10-5 mol.
L-1 for caffeine, theobromine, theophylline, respectively. In this study, a pre-separation step was not required despite the overlapping voltammetric peaks of caffeine, theobromine, and theophylline in the mixtures, as chemometrics techniques, such as partial least squares (PLS), principal component regression (PCR), and classical least squares (CLS) were applied. Among the three multivariate linear regressions, the PLS method was chosen because it has the smallest relative error, all less than ±11.1%. In contrast, the CLS performed poorly with relative reaching up to ±83%. The proposed novel method was applied to simultaneously determine caffeine, theobromine and theophylline in tea samples. The results showed no significant differences compared to those obtained using high-performance liquid chromatography (HPLC).
کلیدواژه‌های انگلیسی مقاله Adsorptive stripping voltammetry,Chemometrics,Caffeine,Theobromine,Theophylline,Tea samples
نویسندگان مقاله Thuong Thi Kim Nguyen |
Department of Analytical Chemistry, Faculty of Chemistry, University of Science, Vietnam National University, Hanoi, Vietnam

Tuan Annh Pham |
Department of Analytical Chemistry, Faculty of Chemistry, University of Science, Vietnam National University, Hanoi, Vietnam

Thu Huyen Luu |
Department of Analytical Chemistry, Faculty of Chemistry, University of Science, Vietnam National University, Hanoi, Vietnam

Thi Huong Giang Le |
Department of Analytical Chemistry, Faculty of Chemistry, University of Science, Vietnam National University, Hanoi, Vietnam

Huy Hoang Do |
Department of Analytical Chemistry, Faculty of Chemistry, University of Science, Vietnam National University, Hanoi, Vietnam

Minh Huong Giang Dang |
Department of Analytical Chemistry, Faculty of Chemistry, University of Science, Vietnam National University, Hanoi, Vietnam

Thi Thao Ta |
Department of Analytical Chemistry, Faculty of Chemistry, University of Science, Vietnam National University, Hanoi, Vietnam

نشانی اینترنتی https://www.abechem.com/article_719407_6ae525d2abebe7743ca1c57f1a4eb908.pdf
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