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Extinction coefficient of polymerized diaminobenzidine complexed with cobalt as final reaction product of histochemical oxidase reactions

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Abstract

The extinction coefficient is essential for the conversion of cytophotometric (mean integrated) absorbance values into absolute units of enzyme activity, for instance expressed in terms of moles of substrate converted per unit time and per unit wet weight of tissue. The extinction coefficient of polymerized diaminobenzidine (polyDAB) complexed with cobalt as the final reaction product of oxidase reactions was estimated at 575 nm by comparison of the amounts of final reaction products formed after incubation of serial unfixed cryostat sections of rat kidney to demonstrate D-amino acid oxidase activity with either the tetrazolium salt method or the cerium-DAB-cobalt-hydrogen peroxide method. Both procedures resulted in similar localization patterns of final reaction product in a granular form in epithelial cells of proximal tubules in rat kidney. The granules were peroxisomes. Linear relationships were found for both methods between the specific amounts of final reaction product generated by D-amino acid oxidase activity and incubation time. The cerium salt method gave rise to 7.4 times higher absorbance values of final reaction product generated per unit time and per unit wet weight of tissue than the tetrazolium salt procedure. The extinction coefficient of tetranitro BT-formazan is 19 000 at 557 nm. Therefore, the cytophotometric extinction coefficient of the poly DAB-cobalt complex as final reaction product of oxidase reactions was established to be 140 000.

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Authors and Affiliations

  1. Laboratory of Cell Biology and Histology, Academic Medical Centre, Meibergdreef 15, NL-1105 AZ, Amsterdam, The Netherlands

    Wilma M. Frederiks, Klazina S. Bosch & Rosier J. M. Van den Munckhof

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  1. Wilma M. Frederiks
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  2. Klazina S. Bosch
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  3. Rosier J. M. Van den Munckhof
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Frederiks, W.M., Bosch, K.S. & Van den Munckhof, R.J.M. Extinction coefficient of polymerized diaminobenzidine complexed with cobalt as final reaction product of histochemical oxidase reactions. Histochem Cell Biol 104, 473–477 (1995). https://doi.org/10.1007/BF01464338

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