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Screen-Printed Carbon Electrodes Modified with Cobalt Phthalocyanine for Selective Sulfur Detection in Cosmetic Products
Department of Cosmetic Science, Providence University 200 Chungchi Rd., Taichung 43301, Taiwan
Department of Safety, Health and Environmental Engineering, Hung Kuang University 34 Chungchi Rd., Taichung 43302, Taiwan
* Author to whom correspondence should be addressed.
Received: 13 April 2011; in revised form: 31 May 2011 / Accepted: 2 June 2011 / Published: 9 June 2011
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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MDPI and ACS Style
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.