Luminol is also called luminol and its chemical name is 3-aminophthalic hydrazide. It is often used in chemiluminescence immunoassay biochemical systems. The appearance is yellow crystal or beige powder at room temperature, which is a relatively stable chemical reagent. It is often used for blood testing in criminal investigation scenes. When luminol reagent is sprayed on the blood, it will oxidize with active oxygen and release blue-violet fluorescence, which is called luminol reaction.
The chemiluminescence analysis method is widely used in the direct determination of drugs and biochemical samples because of its high sensitivity, wide linear range, and simple instrument operation. Studies on the determination of ketotifen fumarate by chemiluminescence and electrochemiluminescence analysis have also been reported. However, the study on the determination of ketotifen fumarate based on potassium permanganate chemiluminescence system has not been reported. After experimentation, it is found that in alkaline medium, potassium permanganate can oxidize luminol to produce a luminescence signal, and ketotifen fumarate has a strong sensitizing effect on the luminescence signal.
For this reason, we conducted experiments and analyzed the following conclusions:
1 Flow injection chemiluminescence signal system of flow injection chemiluminescence signal.
In an alkaline medium, potassium permanganate can oxidize luminol to produce chemiluminescence. When ketotifen fumarate is added to the reaction system, the chemiluminescence intensity is significantly enhanced.
2 Chemiluminescence spectrum
The maximum emission wavelength of the two luminescence systems is about 425 nm, which is consistent with the maximum emission wavelength of the luminol luminophore, indicating that the luminophores of the two chemiluminescence systems are excited state 3-aminophthalate. The luminescence intensity of the luminol-potassium permanganate-ketotifen fumarate system is significantly higher than that of the luminol-potassium permanganate system, indicating that the addition of ketotifen fumarate enhances the sensitivity of luminol-permanganate The luminous intensity of the potassium acid system. To
3 Selection of flow path and flow
After experimentation, it is found that different mixing modes of the solution have a great influence on the luminescence signal. The various flow paths of the selected system were compared. The influence of different flow rates on the luminescence signal of the system was investigated. The experiment shows that with the increase of the flow rate, it first increases and then decreases, and reaches the maximum value when the flow rate reaches 1.9 mL·min. The test selects the flow rate of each pipeline to be 1.9 mL·min.
4 Selection of the concentration of sodium hydroxide solution
In 0.02～0.3 mol·L-4. Within the scope, the influence of the concentration of sodium hydroxide solution on the luminescence intensity of the reaction system was investigated. The results show that when the concentration of sodium hydroxide solution is 0.05～0.15Mol·L-1, the maximum and basically unchanged, the test chooses the concentration of sodium hydroxide solution to be 0.1 Mol·L-4.
5 The choice of oxidant and its concentration
The experiment investigated the influence of different oxidants such as potassium permanganate, potassium ferricyanide, hydrogen peroxide, potassium periodate on the chemiluminescence signal of the system. The results show that when potassium permanganate is used as the oxidant, the chemiluminescence sensitivity signal value is large and stable. Its concentration is 5.0×10-4mol·L-1. Therefore, the concentration of potassium permanganate solution is 5.0×10-4mol·L-1.
6 Selection of the concentration of luminol solution
Luminol is the main luminescent substance, and its concentration has a greater impact on the luminous intensity, detection sensitivity, and linear range. The experiment investigated the influence of luminol solution concentration in the range of 2.0×10-4～1.0×10-4mol·L_1 on the luminescence signal of the system. The results showed that as the concentration of luminol solution increased, chemiluminescence The increasing intensity indicates that the concentration of the luminol solution should not be too large; if the concentration of the luminol solution is too small, the luminescence signal value is small and the stability is poor. In consideration of stability and sensitivity, the concentration of luminol solution was selected as 3.0×10-4mol·L-1.
Hubei Xindesheng Materials specializes in the production and development of chemiluminescence reagents, luminescent substrates, biological buffers, blood collection tube additives and enzyme preparations. Desheng has been established for decades and has its own R&D team. It has been researching and developing chemiluminescence reagents for many years. There are many kinds of raw chemical products under its control. At present, the products produced by Desheng have been sold to many countries around the world, and they have been repurchased with praise, and have reached long-term cooperation with many enterprises.
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