Phycocyanin is a dark blue powder isolated from spirulina. It is mainly found in cyanobacteria, red algae and cryptomonas. Generally, phycocyanin is also divided into C-phycocyanin and R-phycocyanin. The former is mainly present in cyanobacteria and the latter is mainly present in red algae; both exist in cryptomonas. It can absorb light (orange) energy and transfer light energy. It acts as protein and an excellent natural food coloring, as well as good healthcare food.
Phycocyanin is blue particle or powder. It is a protein-binding pigment, so it has the same properties as protein. Its isoelectric point is 3.4. It is soluble in water and insoluble in alcohol and grease. It is unstable to heat, light and acids. It is stable under weak acidity and neutrality (pH 4.5-8) conditions. Precipitation will occur at （pH 4.2) and discoloration will happen in case of exposure to strong alkali.
1. Phycocyanin is a water-soluble pigment, non-toxic, pure blue, bright and lovely, and can be used as an additive for food colorants and cosmetics.
2. Phycocyanin can help regulate and synthesize a variety of important enzymes required for human metabolism. It plays an important role in inhibiting the growth of cancer cells and promoting human cell regeneration, maintaining the ovary, and promoting the synthesis of elastin in the human body. In addition, phycocyanin can regulate the human immune system, enhance the function of the immune system, and improve the body's resistance to diseases.
3. Phycocyanin is blue and fluorescent, and can be used as a reagent for some photodynamic research in biology and cytology.
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