| Edible pigments are widely used in all trades and professions. Compared with synthetic pigments, natural edible pigments gain their advantages for the characteristics of edibleness, innocuousness and free of side effects.In this paper, we selected new species of red beef introduced from America by Economy Crops Institute, Xinjiang Academy of Agricultural Science as experiment material and carried out a comparatively careful study on extraction technology. During contrast experiments, we studied the effects of various time and temperature for heat treatment, digestion agent, digestion efficiency, different condensation and drying process, and found out the optimal extraction technology for beef red pigment. Then the stability of extracted pigments was comparatively studied from several influencing factors, such as light, heat, pH value, metal ion, additives(oxidant, reduction agent , sugar agent, preservative), and the composition and recipe of optimal stabilizing agent is ascertained. Furthermore, we undertook a conscientious study on physical & chemical properties on the extracted beef red pigment.The results illustrate water digestion method is feasible to extract red pigment from beef, which detailed technology process as the following: firstly, do a net treatment, heat it under 90 for 15min, choose water as the extractor, (the ratio of water/red beef is 5:1) , then, extract for 50minutes (dry sample is optimal at 120 minutes) , after the extraction the solution is vacuum concentrated under 40 , then ,by the Freeze Drying for concentrated solution, pulverous product are obtained and sealed for preservation. Under the experimental conditions, the yield reached 9.56%,apparently higher than Spray Drying previously reported .The pigment is soluble in water, insoluble in organic agents, in application to slightly acid condition (PH=5 is optimal) . While the majority metal ions had no side-effect on pigment stability, only Fe3+, Fe2+, Cu2+, Ca2+had a little influence. Heat-resistant, oxidize-resistant, and its light-resistance and reducing-resistance is rather bad. Oxidant agent can destruct pigment stability completely, reducing agent and sugar agent also effect stability greatly, and preservative has no obvious effect.The selected composition of stability agents was 0.04% Vitamin C and 0.02% sodium Benzoate. As far as the results indicates, when the stable agent is added into, the stability of pigment can be improved greatly, the survival rate can be improved 47.9% compared to the control experiments.Hazardous trace elements analysis and test indicate that the pigment is safe, harmless, nutritious and all the indicators are accord with national standard.
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