The reaction that catalase (CAT) decomposes H2O2 can be quickly stopped by ammonium molybdate. The residual H2O2 reacts with ammonium molybdate to generate a yellowish complex. CAT activity can be calculated by production of the yellowish complex at 405 nm.
Catalase can decompose H2O2 to generate H2O and O2, the residual H2O2 in the detection system react with the fluorescent substance, and the content of residual H2O2 is proportional to the fluorescence intensity at the excitation wavelength of 535 nm and emission wavelength of 587 nm, the catalase activity is inversely proportional to the fluorescence intensity.
Cathepsin D (CatD) is an important intracellular aspartic acid protease and is widely present in the biological world. Cathepsin D has multiple biological functions and is involved in intracellular protein degradation, apoptosis and autophagy, etc. The detection principle of this kit: CatD hydrolyzes the substrate to generate the chromogenic substance. The activity of cathepsin D in the sample is calculated by measuring the changes in fluorescence values at the excitation wavelength of 328 nm and the emission wavelength of 393 nm
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