Luminol is abbreviated as luminol, which is a commonly used chemiluminescence reagent. It can emit a light blue glow when oxidized by an oxidant. It is usually used to detect blood stains in criminal investigations or used with POD for biochemical detection of chemiluminescence equipment.
Some people find that the luminous efficiency is not high when experimenting with luminol. What is the reason? Usually luminol is oxidized to emit light, and the effect is very obvious. If there is flashing or weak luminescence or no luminescence, there may be several reasons:
1. Luminol reagent problem
Luminol is a luminescent reagent and is very sensitive to light, so it is usually stored in an opaque brown bottle sealed at low temperature. If luminol expires or has been partially oxidized, the luminous efficiency will be reduced or no light will be emitted.
2. Low peroxidase activity
When luminol is used in biochemical detection, it is usually oxidized with hydrogen peroxide, which needs to be catalyzed by peroxidase POD. If the enzyme activity is low, it will affect the oxidative luminescence performance of luminol. Enzyme catalytic reaction requires high temperature and pH value. Too much sodium hydroxide increases alkalinity or impurities in the system will affect enzyme activity.
Third, the concentration of the excitation solution and the proportion of ingredients
The excitation liquid used for luminol luminescence usually refers to hydrogen peroxide solution and sodium hydroxide solution. When used in different sample detection tests, there are certain differences in the concentration of materials. The proportion of ingredients and the order of reagent addition are all related to the entire chemical The luminescence experiment has an impact, this needs to be adjusted for a specific experiment.
4. Concentration of non-enzyme catalyst
Some luminol chemiluminescence experiments were not completed under the catalysis of peroxidase, but potassium ferricyanide, ferric chloride, ferrous sulfate, potassium dioxalate ferrite, etc. were used as catalysts to catalyze the oxidation of H2O2. Mino. When using this type of catalyst, pay attention to the iron ion concentration not too high, otherwise luminol will easily cause instant flashing.
If the chemiluminescence effect of luminol is not good, it is mainly due to the above reasons. Desheng is a manufacturer of chemiluminescent reagents such as luminol and acridinium esters. According to experience, novices who buy luminol reagents for experiments should do a few more regular tests based on the above circumstances to cause the problem early.
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