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What's in shrimp's orange eyes?
In general, the shells of live crabs and live shrimps are turquoise. When crabs and shrimps are put into the pot, most of the pigments are decomposed at high temperature. Only astaxanthin is not afraid of heat and will not decompose at high temperature. Instead, it is bright red, so the cooked crabs and shrimps turn red.
It's the shrimp. Crabs originally contain a substance called astaxanthin, which makes the whole body look green. When cooking, it turns red because of the oxidation of astaxanthin!
Among carotenoids, reducing astaxanthin is the most important. It is the main red substance of shrimp and salmon. Proastaxanthin exists in shrimp shells. Because of the combination with protein, it turned blue and purple. Once protein is denatured by heat, it will immediately return to its original red color. However, when the xanthophyll of Banao is combined with protein, it still appears yellow, orange or red. This is why some shrimps or crabs are red when they are alive.
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