Journal Highlight: Simultaneous analysis of Cr(III), Cr(VI), and chromium picolinate in foods using CE-ICP-MS

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  • Published: Jun 1, 2015
  • Author: spectroscopyNOW
  • Channels: Atomic
thumbnail image: Journal Highlight: Simultaneous analysis of Cr(III), Cr(VI), and chromium picolinate in foods using CE-ICP-MS
A method for the simultaneous detection of trace Cr(VI), Cr(III), and chromium(III) picolinate in foods using CE-ICP-MS together with ultrasonic-assisted extraction has been developed.

Simultaneous analysis of Cr(III), Cr(VI), and chromium picolinate in foods using capillary electrophoresis-inductively coupled plasma mass spectrometry

Electrophoresis, 2015, 36, 1208-1215
YiQuan Chen, JinFa Chen, Zhiming Xi, Guidi Yang, Zujian Wu, JianRong Li and FengFu Fu

Abstract: We herein reported a method for the simultaneous detection of trace Cr(VI), Cr(III), and chromium(III) picolinate (CrPic) in foods using CE-ICP-MS together with ultrasonic-assisted extraction. The Cr(III) (Cr3+) was chelated with trans-1,2-diaminocyclohexane-N,N,N´,N´-tetraacetic acid (DCTA) to form a single charged Cr-DCTA complex. Then, Cr(VI) (CrO42−), Cr-DCTA, and CrPic were separated by CE within 8 min under a separation voltage of –13 KV followed by their monitoring with ICP mass spectrometer (ICP-MS). The proposed method is simple, effective, and sensitive. It has an instrument detection limit of 0.10, 0.18, and 0.20 ngCr/mL for Cr(VI), Cr(III), and CrPic, respectively. With the help of the methods, we have successfully determined Cr(VI), Cr(III), and CrPic in nutritional supplement (CrPic yeast tablet) with an RSD (n = 5) <6% and a recovery of 93–103%. The experimental results showed that CrPic was the main speciation of chromium in the nutritional supplement, with a concentration of 1514.6 μg Cr/g.

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