1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Homework Help: Graphic representation of xantoprotheic reaction

  1. Sep 30, 2012 #1
    1. The problem statement, all variables and given/known data
    O hai,[STRIKE] my minions.
    So...we made the xantoprotheic reaction in the lab, but I have to attach the representation of the reaction. I haven't found it anywhere. So I came to you.

    2. Relevant equations
    Protein + NaNO3→(180s@373K)→(room temp) + NaOH→ Weird yellow precipitate, possibly more than two compounds

    3. The attempt at a solution
    I'm clueless about the answer. It could be NaNO3, but that salt is white, and not yellow, so something else could appear in the final result. What I am missing?
    Last edited: Sep 30, 2012
  2. jcsd
  3. Oct 1, 2012 #2


    User Avatar

    Staff: Mentor

    I was able to google the answer is 2 minutes. It is not a salt. Protein gets modified in a way that makes it insoluble (and no, it is not just a simple denaturation).
  4. Oct 1, 2012 #3
    After some weird results, the answer is apparently a xanthoprotein. Most of sources, however, simply say "the yellow thing is a xanthoprotein", while never saying how it is made. On another source, it simply says "becomes yellow because nitro-compounds are formed.
    But wait! Borek said they become insoluble....that means it is either a very high, or very low density compound, which could mean the huge protein is...broken into not-so-huge aromatic, carboxylic acids, possibly?
    Also, they become sort of solid, which means the yellow thing, if organic, is a long-chain compound, which makes it solid. The long chain also means it becomes apolar and water-non-soluble.
    So....aromatic generic carboxyacids, maybe? Maybe that's a xanthoprotein.
    And yes, I looked at the preffix 'xantho-'. It is a category of crabs. Not very useful,
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook