Abstract: Pigment often used as coloring agents, it can improve the material's color and use of additives in food widely.According to the source, pigment can be divided into natural pigments and synthetic pigments. The natural pigment mainly extracted from plants, animals and microbes. As awareness of the advantages of natural pigment in recent years, its demand increasing, the traditional method of extraction from plants and animals have failed to meet this demand. Pigment production by microbial fermentation can be gradually taken seriously, and has become a hot research problem. This experiment is to study one kind of pigment producing strains , using such as single factor, orthogonal methods for determination of their biological characteristics, identify the most suitable for growth of this culture medium and temperature conditions. By liquid shake flask to obtain pigment. Since most of the pigment in the use of time to consider such factors as the stability and function, so in this experiment the stability and antioxidant of the pigment conducted a preliminary study. Testing stability, use of its absorbance change can be analyzed to conclude. In oxidation experiments, mainly with DPPH radical scavenging method, hydroxyl radical Fenton reaction was determined by colorimetry.
