Protein Precipitation: Salting Out and Salting In Effects
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Questions and Answers

What is the effect of full saturation with (NH4)2SO4 on albumins?

  • They are dissolved
  • They are not precipitated
  • They are completely precipitated (correct)
  • They are partially precipitated
  • Why is excess NaOH required before adding copper sulfate in Biuret's test?

  • To remove excess ammonium sulfate
  • To consume most of the alkali added (correct)
  • To increase the pH of the solution
  • To reduce the amount of copper sulfate
  • What is the result of adding an equal volume of saturated (NH4)2SO4 solution to 10 ml of egg white solution?

  • A white precipitate of globulin is obtained (correct)
  • The solution becomes acidic
  • A white precipitate of albumin is obtained
  • No precipitate is formed
  • What is the purpose of boiling the upper part of the solution in the separation of globulin and albumin?

    <p>To coagulate globulin</p> Signup and view all the answers

    What is the nature of proteins, according to the principle of precipitation by alkaloidal reagents?

    <p>Amphoteric</p> Signup and view all the answers

    What is the result of the reaction between proteins and alkaloid reagents?

    <p>Formation of an insoluble salt</p> Signup and view all the answers

    What is the effect of adding a high concentration of neutral salts to a protein solution?

    <p>Precipitation of proteins</p> Signup and view all the answers

    What is the primary purpose of using alkaloidal reagents in biological fluids?

    <p>To precipitate proteins</p> Signup and view all the answers

    What is the principle behind the salting out effect?

    <p>Dehydration of protein particles and neutralization of protein electrical charges</p> Signup and view all the answers

    What is the consequence of adding excess precipitating agents to protein?

    <p>Re-dissolution of the formed precipitate</p> Signup and view all the answers

    What is the most commonly used salt in the salting out effect?

    <p>Ammonium sulfate</p> Signup and view all the answers

    What is the principle behind the precipitation of proteins by salts of heavy metals?

    <p>Neutralization of protein particles</p> Signup and view all the answers

    What is the ideal condition for the precipitation of proteins by salts of heavy metals?

    <p>Slightly alkaline medium</p> Signup and view all the answers

    What is the purpose of the salting out effect in protein separation?

    <p>To separate individual proteins from a mixture</p> Signup and view all the answers

    What type of proteins are not readily precipitated by saturation with ammonium sulfate?

    <p>Peptone</p> Signup and view all the answers

    What is the result of adding conc. HNO3 to protein?

    <p>Denaturation of proteins</p> Signup and view all the answers

    What is the name of the test where a certain volume of saturated salt solution is added to the same volume of protein solution?

    <p>Half Saturation Test</p> Signup and view all the answers

    What is the term used to describe the complex acids used in the precipitation of alkaloids?

    <p>Alkaloidal reagents</p> Signup and view all the answers

    What happens to the protein when heat is applied?

    <p>It undergoes denaturation</p> Signup and view all the answers

    What is the purpose of adding acid to the solution in the precipitation test?

    <p>To neutralize the negative charge of the protein</p> Signup and view all the answers

    What is the result of heating proteins containing aromatic amino acids with conc.HNO3?

    <p>A yellow color is formed</p> Signup and view all the answers

    What is the definition of denaturation of proteins?

    <p>A non-hydrolytic modification of the structure of the protein</p> Signup and view all the answers

    What is the purpose of the test where a white ring of protein precipitate is formed?

    <p>To detect the presence of albumin in urine</p> Signup and view all the answers

    What happens to the nitro compound formed in the Xanthoproteic Test when strong alkali is added?

    <p>It intensifies the color to orange</p> Signup and view all the answers

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