Creatinine (Cr) can be catalyzed by creatinase and generates creatine. Creatine can be hydrolyzed into sarcosine and urea by creatinase. The sarcosine can be catalyzed by sarcosine oxidase and form glycine, formaldehyde and hydrogen peroxide. The reaction between hydrogen peroxide, 2,4-(6-Tri-iodine-3- hydroxybenzoic acid) and 4-ampyrone can be catalyzed by peroxidase and form pink compound. Creatinine content can be calculated indirectly by measuring the OD value at 515 nm.
Superoxide anion (O2•-) produced by xanthine and xanthine oxidase system can oxidize hydroxylamine to form nitrite which appear purplish red after chromogenic reaction. The SOD in the sample has a specific inhibitory effect on superoxide anion (O2•-), can reduce the content of nitrite. The OD value is lower than control and the activity of SOD is calculated through the formula. There are two kinds of SOD (CuZn-SOD, Mn-SOD) in the cells of higher animals, and the sum of them is equal to the total SOD. The activity of Mn-SOD in the sample will lost after sample pretreatment, but the activity of CuZn-SOD will not.
Arachidonic acid generates prostaglandins under the catalysis of cyclooxygenase, and under the action of cofactor (heme), cyclooxygenase activates peroxidase activity, converting fluorescent red into fluorescent substance.
Cystathionine-β-synthase (CBS) can participate in the production of hydrogen sulfide, a gas signaling molecule, and play an important role in cell metabolism. The principle of this kit is that CBS and enzyme catalyzed substrates can convert NADH into NAD through enzyme-linked reaction. By detecting the change of NADH per unit time, the amount of CBS enzyme activity in the sample can be calculated.
Phosphotungstic acid can be reduced by Cys and form tungsten blue, which has an absorption peak at 600 nm. Cys content can be calculated with the absorbance at 600 nm.
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