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Calix [n]arenes are a class of macrocycles that have attracted much interest because of their potential for forming host-guest complexes, and have been extensively investigated in various fields. In this study, in an attempt to develop calix[n]arenes as an effective analytical reagent with enzyme-like activity, the peroxidase-like activity of the ion-exchangers modified with some metal complexes of thiacalix[4]arenetetrasulfonate (Fig. 1) was investigated. The modified ion-exchanger with the highest activity was applied for the determination of hydrogen peroxide and glucose in place of peroxidase.