Abstract
The thiocyanate effects were pH-dependent. Guaiacol oxidation was inhibited only at pH values less than 6.5, whereas iodide oxidation and tyrosine iodination were inhibited at 3.4–8.0 pH. Guaiacol and SCN − had the same binding site on the enzyme surface which did not bind H 20 2. SCN − competitively inhibited both iodide oxidation and tyrosine iodination and was even able to de-iodinate iodinated tyrosine derivatives. The results indicate that guaiacol oxidation is inhibited by CN − produced by oxidation od SCN − catalysed by lactoperoxidase, whereas iodide oxidation and tyrosine iodination were inhibited due to the competitive action of SCN −.
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