Color modification of diaminobenzidine (DAB) precipitation by metallic ions and its application for double immunohistochemistrySM Hsu and E Soban
Three metallic ions, NiCl2, CoCl2, and CuSO4, were found to modify the color of the normally brown diaminobenzidine (DAB) reaction. The colors ranged from purplish blue (NiCl2), dark blue/bluish black (CoCl2), to greyish blue (CuSO4). We have found that the CoCl2 + DAB is the ion of choice because: 1) it yields a distinct dark blue color that is easily distinguishable from brown DAB; 2) the blue reaction product is very stable throughout the entire staining procedure; and 3) background staining is minimal. These findings can be applied to the double staining technique of two different antigens in the same section. Among three staining procedures discussed, the avidin-biotin peroxidase complex (Co-DAB)-peroxidase-antiperoxidase (DAB) technique produced the best results because: 1) no antibody elution was needed following the avidin-biotin-peroxidase complex procedure when the CoCl2-DAB modification was used; and 2) no background staining occurred.
Volume 30,
Issue 10,
pp. 1079-1082,
10/01/1982
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