Re-evaluation on the safety of Erythrosine as a food additive: Structural Mechanism Comparison of the phased-out Red No. 3 and Natural Colorants as alternatives

Abstract

 The safety of artificial food colorants, particularly the Red Dye No. 3 (erythrosine), has become the centre of public health concerns. This type of artificial dye was once widely used in the food industry due to its vivid color and photostability. It has now been connected to potential health risks. Free iodine may be released when the metabolic breakdown of Red Dye No. 3 occurs due to the tetraiodinated fluorescein backbone. This potentially leads to endocrine disturbance and even cancer. Natural colorants, on the other hand, have several chemical issues, including instability when exposed to light, heat, and changes in pH, which makes them less suitable for industrial use. Switching from synthetic to natural food colorants is not only a technological step forward, but it also means that food additives need to be chemically redesigned to make them safer and more environmentally friendly. This article compares the chemical structures, metabolic routes, and safety profiles of synthetic and natural food colors. The focus is on the chemical reasons why Red Dye No. 3 is hazardous and the structural benefits of natural dyes in making things less toxic.