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xanthin

xanthin


  2  definitions  found 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Xanthin  \Xan"thin\,  n.  [Gr.  xanqo`s  yellow.] 
  1.  (Physiol.  Chem.)  A  crystalline  nitrogenous  body  closely 
  related  to  both  uric  acid  and  hypoxanthin,  present  in 
  muscle  tissue,  and  occasionally  found  in  the  urine  and  in 
  some  urinary  calculi.  It  is  also  present  in  guano.  So 
  called  from  the  yellow  color  of  certain  of  its  salts 
  (nitrates). 
 
  2.  (Chem.)  A  yellow  insoluble  coloring  matter  extracted  from 
  yellow  flowers;  specifically,  the  coloring  matter  of 
  madder.  [Formerly  written  also  {xanthein}.] 
 
  3.  (Chem.)  One  of  the  gaseous  or  volatile  decomposition 
  products  of  the  xanthates,  and  probably  identical  with 
  carbon  disulphide.  [Obs.] 
 
  From  Webster's  Revised  Unabridged  Dictionary  (1913)  [web1913]: 
 
  Xanthine  \Xan"thine\,  n.  Also  Xanthin  \Xan"thin\  .  [Gr.  xanqo`s 
  yellow.]  (Physiol.  Chem.) 
  A  white  microcrystalline  nitrogenous  compound,  {C5H4O2N4}, 
  present  in  muscle  tissue,  in  the  liver,  spleen,  pancreas,  and 
  other  organs,  and  also  in  urine  (in  small  quantities)  and 
  some  urinary  calculi,  and  in  the  juices  of  certain  plants;  -- 
  so  called  because  it  leaves  a  yellow  residue  when  evaporated 
  to  dryness  with  nitric  acid.  Xanthine  is  closely  related  to 
  uric  acid.