Why benzedine test is done?
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In the past, benzidine was used to test for blood. An enzyme in blood causes the oxidation of benzidine to a distinctively blue-coloured derivative. The test for cyanide relies on similar reactivity. Such applications have largely been replaced by methods using phenolphthalein/hydrogen peroxide and luminol.
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The selective properties of the test. The next group of experiments was designed to show whether there are substances other than blood which, when taken by mouth, can cause a positive benzidine reaction in the stool.
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