Abstract: Cobalt phthalocyanine (CoPc) films were deposited on the surface of a screen-printed carbon electrode using a simple drop coating method. The cyclic voltammogram of the resulting CoPc modified screen-printed electrode (CoPc/SPE) prepared under optimum conditions shows a well-behaved redox couple due to the (CoI/CoII) system. The CoPc/SPE surface demonstrates excellent electrochemical activity towards the oxidation of sulfur in a 0.01 mol·L−1 NaOH. A linear calibration curve with the detection limit (DL, S/N = 3) of 0.325 mg·L−1 was achieved by CoPc/SPE coupled with flow injection analysis of the sulfur concentration ranging from 4 to 1120 mg·L−1. The precision of the system response was evaluated (3.60% and 3.52% RSD for 12 repeated injections), in the range of 64 and 480 mg·L−1 sulfur. The applicability of the method was successfully demonstrated in a real sample analysis of sulfur in anti-acne creams, and good recovery was obtained. The CoPc/SPE displayed several advantages in sulfur determination including easy fabrication, high stability, and low cost.
Keywords: sulfur; cosmetics; cobalt phthalocyanine; screen-printed carbon electrode
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Chen, P.-Y.; Luo, C.-H.; Chen, M.-C.; Tsai, F.-J.; Chang, N.-F.; Shih, Y. Screen-Printed Carbon Electrodes Modified with Cobalt Phthalocyanine for Selective Sulfur Detection in Cosmetic Products. Int. J. Mol. Sci. 2011, 12, 3810-3820.
Chen P-Y, Luo C-H, Chen M-C, Tsai F-J, Chang N-F, Shih Y. Screen-Printed Carbon Electrodes Modified with Cobalt Phthalocyanine for Selective Sulfur Detection in Cosmetic Products. International Journal of Molecular Sciences. 2011; 12(6):3810-3820.
Chen, Pei-Yen; Luo, Chin-Hsiang; Chen, Mei-Chin; Tsai, Feng-Jie; Chang, Nai-Fang; Shih, Ying. 2011. "Screen-Printed Carbon Electrodes Modified with Cobalt Phthalocyanine for Selective Sulfur Detection in Cosmetic Products." Int. J. Mol. Sci. 12, no. 6: 3810-3820.