Astaxanthin is a natural carotenoid pigment with strong antioxidant activity, which can be used in medicine, health food, cosmetics, etc., and has huge market value. Eating carotenoid-rich fruits and vegetables can reduce the risk of many diseases. Compared to other carotenoids, the keto carotenoid, astaxanthin, has become a commercially valuable compound due to its powerful antioxidant properties. Occurs naturally in the flowers of certain algae, bacteria and some genera, but these organisms are present in too little and are expensive to extract.