Xanthoprotein n. : A yellow acid substance formed by the action of hot nitric acid on albuminous or proteid matter. It is changed to a deep orange-yellow color by the addition of ammonia.

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Defination from the web:
Xanthoprotein information including symptoms, causes, diseases, symptoms, treatments, and other medical and health issues. ... Xanthoprotein: The yellow nitrophenyl product formed when protein is treated with hot, concentrated nitric acid, probably from nitration of phenyl groups. ...