Myeloperoxidase reduces hydrogen peroxide to a complex. The complex react with o-dianisidine (as hydrogen donor) to produce a yellow product which has a maximum absorption peak at 460 nm. The activity of MPO can be calculated indirectly by measuring the OD value at 460nm.
Under the catalysis of peroxidase, hydrogen peroxide can oxidize the non-fluorescent probe into the fluorescent substance, and its fluorescence intensity is proportional to the total peroxidase activity in the sample. This kit specifically inhibits the peroxidase activity of MPO in the sample through an MPO enzyme inhibitor, thus distinguishing the peroxidase activity of MPO in the sample from that of other peroxidases.
NADH Oxidase（NOX）is widely found in the animals, plants, microorganisms and cultured cells, which can directly oxidize NADH to NAD+ in the presence of oxygen, and reduce blue DCPIP to colorless DCPIP. The activity of NOX can be calculated by measuring the reduction rate of blue DCPIP at 600 nm.
Isocitrate dehydrogenase (IDH) is one of the inverters in the tricarboxylic acid cycle and plays an important role in energy metabolism, amino acid and vitamin synthesis. The cofactors of this enzyme include two kinds of NAD+ and NADP+, which are located in different parts of the cell respectively. In eukaryotic cells, NAD-dependent isocitrate dehydrogenase mainly exists in mitochondria. Under the activation of the activator, IDH converts isocitrate into α-ketoglutaric acid. Meanwhile, NAD+ is reduced to NADH, which under the action of hydrogen transmitter, transfer electrons to WST-8 to produce the yellow product. The activity of NAD-IDH can be calculated by measuring the change of absorbance value at 450 nm.
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