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http://dx.doi.org/10.13103/JFHS.2021.36.4.298

Optimization of Analytical Method for Annatto Pigment in Foods  

Lee, Jiyeon (Department of Food Science and Technology, Chung-Ang University)
Park, Juhee (Department of Food Science and Technology, Chung-Ang University)
Lee, Jihyun (Department of Food Science and Technology, Chung-Ang University)
Suh, Hee-Jae (Department of Food Science, Sun Moon University)
Lee, Chan (Department of Food Science and Technology, Chung-Ang University)
Publication Information
Journal of Food Hygiene and Safety / v.36, no.4, 2021 , pp. 298-309 More about this Journal
Abstract
In this study we sought to develop a simultaneous analysis method for cis-bixin and cis-norbixin, the main components, to detect annatto pigment in food. To establish the optimal test method, the HPLC analysis methods of the European Food Safety Authority (EFSA), Japan's Ministry of Health, Labor and Welfare (MHLW), and National Institute of Food and Drug Safety Evaluation (NIFDS) were compared and reviewed. In addition, a new pretreatment method applicable to various foods was developed after selecting conditions for simultaneous high-performance liquid chromatography (HPLC) analysis in consideration of linearity, limit of detection (LOD), limit of quantification (LOQ), and analysis time. The HPLC analysis method of NIFDS showed the best linearity (R2 ≥ 0.999), exhibiting low detection and quantification limits for cis-norbixin and cis-bixin as 0.03, 0.05 ㎍/mL, and 0.097, 0.16 ㎍/mL, respectively. All previously reported pretreatment methods had limitations in various food applications. However, the new pretreatment method showed a high recovery rate for all three main food groups of fish meat and meat products, processed cheese and beverages. This method showed an excellent simultaneous recovery rate of 98% or more for cis-bixin and cis-norbixin. The HPLC analysis method with a new pretreatment method showed high linearity with a coefficient of determination (R2) of 1 for both substances, and the accuracy (recovery rate) and precision (%RSD) were 98% and between 0.4-7.9, respectively. From this result, the optimized analytical method was considered to be very suitable for the simultaneous analysis of cis-bixin and cis-norbixin, two main components of annatto pigment in food.
Keywords
Bixin; Norbixin; Annatto; HPLC analysis; Method validation;
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