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

International Journal of Molecular Sciences

Pei-Yen Chen²  Chin-Hsiang Luo¹  Mei-Chin Chen²  Feng-Jie Tsai²  Nai-Fang Chang² 

[1] Department of Safety, Health and Environmental Engineering, Hung Kuang University, 34 Chungchi Rd., Taichung 43302, Taiwan; E-Mail:;Department of Cosmetic Science, Providence University 200 Chungchi Rd., Taichung 43301, Taiwan; E-Mails:

关键词: sulfur;    cosmetics;    cobalt phthalocyanine;    screen-printed carbon electrode;   

DOI  :  10.3390/ijms12063810

来源: mdpi

【 摘 要 】

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.

【 授权许可】

CC BY   
© 2011 by the authors; licensee Molecular Diversity Preservation International, Basel, Switzerland.