Lai-Hao W, Shu-Juan H. Design of a flow-through voltammetric sensor based on an antimony-modified silver electrode for determining lithol rubine B in cosmetics.
JOURNAL OF AUTOMATED METHODS & MANAGEMENT IN CHEMISTRY 2011;
2011:896978. [PMID:
21603230 PMCID:
PMC3094699 DOI:
10.1155/2011/896978]
[Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/04/2010] [Revised: 12/16/2010] [Accepted: 01/21/2011] [Indexed: 05/14/2023]
Abstract
Lithol Rubine B (LRB; the disodium salt of 3-hydroxy-4-[(4-methyl-2-sulfophenyl) azo]-2-naphthalenecarboxylic acid) was detected using high-performance liquid chromatography with an electrochemical (antimony film on silver) detector (HPLC-ECD). For direct current (DC) mode, with the current at a constant potential, and measurements with suitable experimental parameters, a linear concentration from 0.125 to 1.80 μg/mL was found. The detection limit of our method was approximately 2.0 ng/mL. An antimony-modified silver detector was used to demonstrate that LRB is electrochemically reduced in acidic media and to analyze commercial cosmetics to determine their LRB content. Findings using HPLC-ECD and HPLC with an ultraviolet detector were comparable.
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