The Histochemical Journal

, Volume 14, Issue 6, pp 857–878 | Cite as

Polarization microscopy and microspectrophotometry of Sirius Red, Picrosirius and Chlorantine Fast Red aggregates and of their complexes with collagen

  • Benedicto De Campos Vidal
  • Maria Luiza S. Mello
  • Édson R. Pimentel
Papers

Summary

A detailed quantitative analysis of the anisotropic properties of Sirius Red F3B, Picrosirius, and Chlorantine Fast Red crystals, and of their complexes with a macromolecularly oriented protein either in a pure form or as part of a tissue structure was carried out. Collagen I was used as the protein model. Linear dichroism and dispersion of birefringence were investigated in dye aggregates, in stained filaments of collagen I and in collagen bundles in sections of tendon. A positive linear dichroism, the characteristics of which varied as a function of the dye type used, was demonstrated for the dye aggregates and stained substrates. However, even thin regions of the stained tendon collagen bundles showed very high absorbances, differing from the pattern reported previously, for collagen stained with another sulphonated azo dye, Xylidine Ponceau. Consequently, not all these dyes enable protein concentration and orientation to be determined in collagen-containing structures. From the linear dichroism patterns it is assumed that the long axis of the molecules of these azo dye is mostly parallel to that of filaments of pure collagen I and statistically parallel to the long axis of collagen bundles of tendon sections. The dye aggregates and, stained pure collagen I and tendon collagen bundles exhibited birefringent images with interference colours that varied as a function of thickness and packing state of the preparations, which is in agreement with reports in the literature. The optical retardations of the collagen bundles increased by a factor of 5–6 times after staining with Picrosirius. From data on form dichroism it is concluded that when studying the macromolecular orientation of collagen preparations stained with azo dyes, the choice of the mounting medium deserves consideration.

Keywords

Sulphonated Polarization Microscopy Ponceau Collagen Bundle Pure Collagen 

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Copyright information

© Chapman and Hall Ltd 1982

Authors and Affiliations

  • Benedicto De Campos Vidal
    • 1
  • Maria Luiza S. Mello
    • 1
  • Édson R. Pimentel
    • 1
  1. 1.Department of Cell Biology, Institute of BiologyUNICAMPCampinasBrazil

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