Journal
ANALYTICAL METHODS
Volume 3, Issue 1, Pages 205-209Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c0ay00592d
Keywords
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Funding
- National Science Council of Taiwan [NSC 98-2113-M-241-002 -MY3]
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A partially preanodized screen-printed carbon electrode (PSPCE*) coupled with flow injection analysis (FIA) was developed to raise the selectivity of ellagic acid (EA). To confirm the effectiveness of partial preanodization, two pretreated screen-printed carbon electrodes were electrochemically compared. One was a PSPCE* fabricated by potential cycling (-1.0-+1.0 V vs. Ag/AgCl) to make the electrode surface partially preanodized and the other was a PSPCE* fabricated by a high treatment potential (+2.0 V vs. Ag/AgCl). Cyclic voltammograms showed that the catalytic current of EA was observed at both the PSPCE* and SPCE*. No catalytic current of ascorbic acid 2-glucoside (AA2G) and magnesium ascorbyl phosphate (MAP) was observed at the PSPCE*. The PSPCE* selectively detected EA. The factors, which influence the EA response current, have previously been discussed. At the detection limit (0.012 ppm, SIN = 3), the linear calibration plot (R-2 = 0.998) was attained for 0.1-50 ppm of EA solutions. A relative standard deviation of 4.37 and 3.90% was conducted for consecutive injections (n = 10) of 1 and 50 ppm EA, respectively. Finally, a practical application of the proposed method was demonstrated by the quantitative analysis of EA in skin whitening creams, and good recovery was obtained.
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