Isolation of a Red Pigment from the Uric Acid Calculi

  • Bernardo Pinto
Part of the Advances in Experimental Medicine and Biology book series (AEMB, volume 41)


Common observations indicate that Uric Acid renal stones have a pink-redish color. This is on strong contradiction with the white color, usually observed, on the shelf uric acid. Most authors have suggested that it is due to the special orientation of the rombic crystalls within the calculi macles. However, ealier observations at this laboratory shown that a pink-yellow color appeared on the alkaline extracts from Uric acid calculi. Such a finding can not be explained by crystallografic means. The purpose of this paper is to show the preliminary results regarding a red pigment of possible inorganic structure existing in the Uric Acid calculi and responsible for the special type of color of these calculi, however we still ignore its place of origin, exact structure and role played on uric acid deposition and crystallization.


Uric Acid Potassium Bromide Color Shift Inorganic Structure Alkaline Elution 
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Copyright information

© Springer Science+Business Media New York 1974

Authors and Affiliations

  • Bernardo Pinto
    • 1
  1. 1.Laboratorio de Exploraciones MetabolicasBarcelona-13Spain

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