Penaeus vannamei is easy to die in the process of fishing, transportation and sales. After death, Penaeus vannamei will turn black in the process of storage, which shortens its shelf life. This is because the tissues of Penaeus vannamei are rich in protein and water. Under the action of microorganisms, tyrosinase in Penaeus vannamei is easy to be activated, and tyrosinase can catalyze the oxidation of tyrosine and its derivatives in tissues and convert them into melanin, which leads to "melanosis". Therefore, it is of great significance to establish a scientific and effective method for the detection of tyrosinase in aquatic products and fruits and vegetables.<br>
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