Pflügers Archiv

, Volume 323, Issue 2, pp 121–140 | Cite as

Lipid soluble weak organic acid buffers as “substrate” for pancreatic secretion

  • I. Schulz
  • F. Ströver
  • K. J. Ullrich
Article
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Summary

The isolated cat pancreas was perfused with a Krebs-Henseleitsolution containing different concentrations of sulfamerazine buffer. Concomitantly the secretory rate, pH value, Cl− and total buffer concentration in the secretion were measured. The following were found:
  1. 1.

    The secretory rate dropped to very small values when the bicarbonate buffer was omitted from the perfusate.

     
  2. 2.

    Sulfamerazine can partly replace the CO2-bicarbonate buffer in promoting water and solute secretion in the saline-perfused preparation of the cat's pancreas.

     
  3. 3.

    The secretion of the sulfamerazine buffer depended exclusively on the concentration of its undissociated component in the perfusate.

     

It is concluded that a separation of H+/OH− ions takes place presumably at the luminal cell border and that the undissociated form of sulfamerazine can penetrate the cell by ‘nonionic diffusion’. In this way a source of H+ ions is provided which may be used either for H+ transport or for the buffering of OH− ions. The process of nonionic diffusion seems to be rate limiting for the buffer secretion, at least when sulfamerazine is offered.

Key-Words

Pancreas Bicarbonate Secretion Buffer Secretion H+ Ion Transport Weak Organic Acids 

Schlüsselwörter

Pankreas Bicarbonatsekretion Puffersekretion H+-Ionentransport schwache organische Säuren 
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Copyright information

© Springer-Verlag 1971

Authors and Affiliations

  • I. Schulz
    • 1
  • F. Ströver
    • 1
  • K. J. Ullrich
    • 1
  1. 1.Max-Planck-Institut für BiophysikFrankfurt a.M.Germany

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