Assay Method Information

Assay Name:  Urease Inhibition Assay
Description:  The inhibition studies of soybean urease were initiated with boric acid and boronic acids (butylboronic acid, 4-bromophenylboronic acid, and phenylboronic acid). Also, heavy metal ions (HgCl2, AgCl, and Cu(CH3COO)2) and sodium salts of mineral acids (NaF, NaCl, NaNO3, and Na2SO4) were investigated for their inhibitory effects. Stock solutions of inhibitors, except for 4-bromophenylboronicacid, were prepared in 0.05 M Tris-acetate buffer, pH 7.0, and were suitably diluted for experiments, whereas a stock solution of 4-bromophenylboronic acid was prepared in absolute ethanol and subsequently diluted in respective buffer. The activity assay was carried out at standard conditions as described earlier in the presence of varying concentrations of inhibitors. The yellow-orange colored solution was measured at 405 nm on a Unicam UV-2 spectrophotometer. The amount of NH3 liberated in the reaction mixture was estimated by calibrating Nessler's reagent with standard NH4Cl solution. One enzyme unit is defined as the amount of urease required to liberate 1 μmol of ammonia per minute under our test conditions (0.1 M urea, 0.05 M Trisacetatebuffer, pH 7.0, 37°C).
Affinity data for this assay
 

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