Simultaneous Determination of Sudan Dyes along with Dimethyl Yellow in Indian Curry Samples by Reverse Phase Liquid Chromatography
Sumita Dixit, Premendra D. Dwivedi and Mukul Das*
Food Toxicology Division, CSIR-Indian Institute of Toxicology Research, Mahatma Gandhi Marg, P. O. Box 80, Lucknow – 226001, U.P, India
- *Corresponding Author:
- Mukul Das
Food Toxicology Division
CSIR-Indian Institute of Toxicology Research Mahatma Gandhi Marg
P. O. Box 80, Lucknow – 226001, U.P, India
E-mail: [email protected], [email protected]
Received date: October 30, 2012; Accepted date: November 20, 2012; Published date: November 23, 2012
Citation: Dixit S, Dwivedi PD, Das M (2012) Simultaneous Determination of Sudan Dyes along with Dimethyl Yellow in Indian Curry Samples by Reverse Phase Liquid Chromatography. J Chromat Separation Techniq 3:150. doi:10.4172/2157-7064.1000150
Copyright: © 2012 Dixit S, et al. This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.
The synthetic organic azo dyes have been studied for their toxicity risk due to formation of suspected carcinogenic aromatic amines on reduction. Based on toxicity data, various unauthorized azo dyes are sometimes illegally used in food preparations either to enhance or to maintain the appearance of food products. Therefore suitable analytical screening and confirmatory methods are required for compliance verification of foodstuffs. Although several methods are available, no method for the simultaneous determination of all the four Sudan dyes along with dimethyl yellow in oil rich Indian curry samples has been reported so far. The present method utilizes a simple extraction step and simultaneous HPLC resolution of Sudan I, II, III, IV and dimethyl yellow in oil rich Indian curry samples. Analysis was performed on a reversed-phase LiChroCART(R) RP-18 column using the gradient mixture of acidified water, acetonitrile and methanol. The flow rate was 1.0 ml min-1 with λ max of 420 up to 4 min and then 500 nm, respectively to monitor dimethyl yellow and Sudan dyes. All the five colors showed good linearity at the concentrations of 0.25- 25.0 mgL-1 with the regression coefficient from 0.997 to 0.999. The LOD ranged from 0.23-0.33 mgL-1 while LOQ varied between 1.19-1.70 mgL-1. The intraday and interday precision gave good RSDs between 0.78 to 4.32%, and percentage recoveries ranged from 62.3 to 77.3%. The applicability of the method has been verified by analyzing fifteen curry samples procured from local markets.