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• Chen, P
• Luo, C
• Chen, M
• Tsai, F
• Chang, N
• Shih, Y
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• Chen, P
• Luo, C
• Chen, M
• Tsai, F
• Chang, N
• Shih, Y
• [+] on PubMed
• Chen, P
• Luo, C
• Chen, M
• Tsai, F
• Chang, N
• Shih, Y

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

Article

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

Pei-Yen Chen ¹ , Chin-Hsiang Luo ² , Mei-Chin Chen ¹ , Feng-Jie Tsai ¹ , Nai-Fang Chang ¹  and Ying Shih ^1,*

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; in revised form: 31 May 2011 / Accepted: 2 June 2011 / Published: 9 June 2011

(This article belongs to the Section Material Sciences and Nanotechnology)

Download PDF Full-Text [542 KB, uploaded 9 June 2011 15:35 CEST]

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 (Co^I/Co^II) 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 (D_L, 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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