biuret reaction

noun

Medical Definition of biuret reaction

: a chemical reaction that produces a violet or purple color when biuret or most proteins are exposed to a reagent of copper sulfate in alkaline solution

Note: The biuret reaction is typically used to indicate the presence and concentration of protein in a test sample and occurs when the peptide bonds in a protein react with the copper ions to produce a violet or purple complex. The intensity of color in solution is proportional to the number of peptide bonds.

Learn More about biuret reaction

Cite this Entry

“Biuret reaction.” The Merriam-Webster.com Medical Dictionary, Merriam-Webster Inc., https://www.merriam-webster.com/medical/biuret%20reaction. Accessed 9 December 2019.

Comments on biuret reaction

What made you want to look up biuret reaction? Please tell us where you read or heard it (including the quote, if possible).

WORD OF THE DAY

contradictory or incongruous words

Get Word of the Day daily email!

Test Your Vocabulary

Semantic Drift Quiz

  • a twisty river
  • Which of the following was once a synonym for fun?
Spell It

Can you spell these 10 commonly misspelled words?

TAKE THE QUIZ
Add Diction

Test Your Knowledge - and learn some interesting things along the way.

TAKE THE QUIZ
Love words? Need even more definitions?

Subscribe to America's largest dictionary and get thousands more definitions and advanced search—ad free!