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Int. J. Mol. Sci. 2011, 12(6), 3810-3820; doi:10.3390/ijms12063810

Screen-Printed Carbon Electrodes Modified with Cobalt Phthalocyanine for Selective Sulfur Detection in Cosmetic Products

1
Department of Cosmetic Science, Providence University 200 Chungchi Rd., Taichung 43301, Taiwan
2
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 / Revised: 31 May 2011 / Accepted: 2 June 2011 / Published: 9 June 2011
(This article belongs to the Section Material Sciences and Nanotechnology)
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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 sulfur; cosmetics; cobalt phthalocyanine; screen-printed carbon electrode
This is an open access article distributed under the Creative Commons Attribution License (CC BY 3.0).

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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.

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