Chemistry of Tannins: Messenger Notes
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Questions and Answers

What is the usual source of tannins?

  • Barks/stems (correct)
  • Flowers
  • Roots
  • Leaves
  • Which of the following is NOT a characteristic of Ellagitannins?

  • MW of around 1000-5000
  • Precipitate leather (correct)
  • Moderate sized molecule
  • Associated with 0-dihydroxy and O-trihydroxy orientation within a phenyl ring
  • Which compounds can become true tannins when many of them combine together?

  • Gallic acid
  • Chlorogenic acid (correct)
  • Ipecacuanhic acid
  • Catechins
  • What is the main distinguishing feature of Hydrolysable Tannins/Pyrogallol Tannins?

    <p>Contain glucose</p> Signup and view all the answers

    Which type of tannin is described as difficult to separate because they do not crystallize?

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

    What is the primary property of tannins that allow them to preserve animal skin/hide?

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

    What is the term used to describe the leather formed after dry distillation?

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

    Which type of tannins are further classified based on the phenolic aglycones?

    <p>Condensed tannins</p> Signup and view all the answers

    What is the color of the precipitate formed by Pyrocatechol tannins?

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

    Which compound is a precursor to the formation of 'Tanner's red' leather?

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

    What is the common flavonoid nucleus found in materials like pomegranate rind and bark?

    <p>Hexahydroxydiphenic acid (HHDPA)</p> Signup and view all the answers

    What does the term 'Phlobatannins' refer to?

    <p>Nonhydrolyzable tannins</p> Signup and view all the answers

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