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• W95543909 abstract "Results obtained on filter paper strips models show that some protein and fatty acids become argentophil as an effect of a previously binding ferric ion although, in this instance, the silver staining can only be accomplished by using a silver diamine solution, since a silver nitrate solution is not effective. However, if the filter paper model is previously treated by a “multidentate ligand” before the silver nitrate solution treatment becomes able in doing the silver staining. This result shows that the binding between Fe3+ and Ag+ can be done if a suitable negatively charged “multidentate ligand” has been connected between them. The following “multidentate ligands” were tested: thiocarbohydrazide, carbohydrazide, and hexamethylenetetramine: ammonia was also tested, as an attempt to disclose if it is able to act as a “multidentate ligand”. The semicarbazide effect was analysed and compared with the “ligands”. It was found, either on filter paper strip models or on histological sections, that every “multidentate ligand”, as well as ammonia, are effective in producing silver staining whereas semicarbazide is devoid of effect. The “ligands” effectiveness depends upon the solution pH, in the same manner that is does occur when the silver diamine “fast technique” is used on tissue sections. Histophotometric measures, taken on tissue sections, show that the silver staining afforded by the silver diamine “fast technique” is similar to that displayed by the “multidentate ligand” plus a silver nitrate solution treatment. In addition, the regression coefficient of the silver staining intensity on the thioglycolate solution concentration that was used to remove the bound iron from tissue sections, is similar for the silver diamine “fast technique” and for the “multidentate ligand” plus silver nitrate solution technique. These results suggest that the silver staining mechanism and its histochemical meaning are similar either for the silver diamine “fast technique” or for the “multidentate ligand” plus silver nitrate solution technique. In the first instance, the “diamine” groups would act as a “multidentate ligand” that could be confirmed by the ammonia effectiveness. In such instance, the mechanism responsible for the silver staining “fast techniques” development seems to be dependent on the presence of another electropositive ion such as Fe3+, on which the Ag+ would be bound by means of a “multidentate ligand”." @default.
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• W95543909 date "1988-01-01" @default.
• W95543909 modified "2023-10-01" @default.
• W95543909 title "The mechanism accounted for the silver staining “fast techniques” development and its histochemical meaning" @default.
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• W95543909 doi "https://doi.org/10.1016/s0065-1281(88)80004-7" @default.
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