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Why is Lumino called the enemy of criminals, the helper of the police?

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Why is Lumino called the enemy of criminals, the helper of the police?

Classification:
News
Author:
2020/07/20 16:00

I believe that many people have watched all kinds of suspense suspense TV series in Hong Kong, such as Gu Ling Jing, Extrajudicial Situation, etc., which are very classic suspense suspense films. The blood stains caused the police to find many obstacles to the detection of criminal clues. Lumino described today is called a helper of the police and an enemy of criminals. Why did he say this?

Luminol (luminol), also known as luminous ammonia. A kind of blood that cannot be observed by the naked eye is detected at the crime scene, and it can show a very small amount of blood stains (occult blood reaction). The chemical name is 3-aminophthaloyl hydrazide. At room temperature, it is a yellow crystal or beige powder, which is a relatively stable synthetic organic compound. The chemical formula is C8H7N3O2, cas No. 521-31-3 , light yellow powder, the solution is strongly acidic, and has a certain stimulating effect on the eyes, skin, and respiratory tract. Because hemoglobin contains iron, and iron can catalyze the decomposition of hydrogen peroxide, hydrogen peroxide becomes water and monooxygen, monooxygen reoxidizes luminol to make it glow. Therefore, Luminol is widely used in criminal investigation, biological engineering, chemical tracing and other fields.

1. Luminol's luminescence mechanism

Luminol emits blue light when oxidized. Blood contains hemoglobin, which contains iron, and iron catalyzes the decomposition of hydrogen peroxide, turning hydrogen peroxide into water and monooxygen. Monooxygen reoxidizes luminol to make it glow. When examining bloodstains, Luminol reacts with heme (a protein in hemoglobin that transports oxygen), showing blue-green fluorescence. This detection method is extremely sensitive, and can detect only one part per million of blood. Even a small drop of blood can be detected in a large tank of water, which shows that it is highly sensitive. However, the current Luminol liquid reagents used in criminal investigations are unstable, and the hydrogen peroxide contained in them is easily decomposed, rendering the reagents ineffective, affecting the test results, and not easy to preserve.

2. The meaning of Lumino

Lumino showed obvious traces of blood, and the researchers will record or record the scene of the crime scene. Normally, Lumino only shows the area under investigation, with possible blood. Because other substances, including household bleach, may also cause Luminol to glow. Experienced investigators can identify by the speed at which their reactions occur, but they still need to run other tests to verify whether it is real human blood.

Lumino itself usually does not resolve a murder case. This is only one step in the investigation process. However, it can display the necessary information and once again received a delayed investigation. For example, the hidden blood splatter mode can help researchers find the point of attack, and even what kind of weapons to use (such as bullets make blood splatter very different). Lumino may also reveal a touch of bloody shoe prints, which is valuable information after investigating the perpetrator's attack.

In some cases, Lumino gave investigators more evidence. If Lumino detects traces of blood on the carpet, investigators can pull up the carpet and find a lot of blood on the floor below.

Luminol can provide valuable information for investigators. Desheng can provide a convenient bridge for customers who want to buy Luminol. Business friends who need chemiluminescent reagents can choose Desheng. Desheng can save you time in purchasing. And cost.