Application of Supercritical Fluid Extraction in Natural Pigments
Food pigments are an important part of food additives. They are not only widely used in food industry to improve the color of food, but also widely used in medicine and cosmetics. Before the mid-19th century, people used natural pigments to colour. Since W. H. Perkins invented the first synthetic organic pigments aniline violet in 1856, many organic pigments have been synthesized one after another. Because of its bright color, stable property and low cost, this kind of pigments soon replaced natural pigments. With the development of science, it has been found that many synthetic pigments are harmful to human body. In addition to its own chemical properties endangering human health, and in the synthesis process, it may also be contaminated by arsenic, aluminum and other harmful substances. Therefore, many synthetic pigments have been banned in the world. According to statistics, there are 90 kinds of synthetic pigments used as food in the world, but only a dozen kinds of synthetic p...