Phycocyanin is a dark blue powder isolated from Spirulina platensis. It mainly exists in cyanobacteria, red algae and cryptobacteria. Phycocyanin is usually divided into C-phycocyanin and R-phycocyanin, the former mainly exists in cyanobacteria, the latter mainly exists in red algae, Cryptophyta both. Its function is to absorb light (orange) and transmit light energy [1]. It is not only a kind of protein, but also an excellent natural edible pigment. It is also a good health food.
Phycocyanin is one of the rare pigments in nature. It is not only a bright color, but also a nutritious protein. Its amino acid composition is complete and its essential amino acid content is high.