| xanthoprotein | <physiology> 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 colour by the addition of ammonia. Source: Websters Dictionary (01 Mar 1998) |
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| xanthoprotein reaction | A qualitative test for proteins; a yellow product is formed by reacting proteins with hot, concentrated nitric acid. (05 Mar 2000) |