The decisive role of luminol reagent 521-31-3 sensitivity in crime scene investigation

In crime scenes, bloodstains as direct evidence are often difficult to detect due to environmental factors or human cleaning. Traditional detection methods rely on the naked eye or conventional chemical reagents, which can only identify visible bloodstains, while trace or diluted bloodstains are often overlooked. The sensitivity of luminol reagent reaches molecular level response, even if the blood is diluted to a concentration of one millionth or repeatedly wiped and washed, its core component heme can still undergo specific reaction with luminol, releasing observable fluorescent signals. This detection capability that breaks through physical limits allows investigators to track the smallest path of bloodstain transfer during the criminal process, providing key evidence for reconstructing the crime.

1, Luminol's luminescent conditions

When luminol reagent binds to hemoglobin in bloodstains, it will excite blue-green fluorescence, whose intensity is independent of the concentration of bloodstains and only depends on the presence of hemoglobin. This feature allows investigators to avoid relying on complex equipment and simply turn off the on-site light source and use ultraviolet lamps to expose bloodstains hidden in shadows, crevices, or complex backgrounds.

luminol reagent

2, The Effect of Time on Luminol Luminescence

Blood stains will gradually degrade over time, and the recognition ability of traditional detection methods for old blood stains will significantly decline over time. The sensitivity of luminol reagent has broken through the time limit - heme, as an iron porphyrin compound, has high stability, and even if the bloodstain has been dried for months or even years, its molecular structure can still trigger the fluorescence reaction of luminol.

3, Non invasive detection

The original state of the crime scene is the cornerstone of the effectiveness of evidence. Traditional detection methods often require physical sampling of suspicious areas, which may disrupt the distribution of bloodstains or contaminate potential evidence. Luminol reagent adopts spray non-contact detection, with the reagent uniformly covering the surface of the site in aerosol form, and locating bloodstains through fluorescent signals without directly touching physical evidence. This "zero interference" detection mode maximizes the preservation of temporal and spatial relationships on site, especially suitable for detecting bloodstains on fragile carriers (such as ancient books, fabrics) or complex structures (such as pipelines, vehicle interiors).

4, Cracking the detection difficulties in complex scenes

The bloodstains at the crime scene may adhere to various materials, from smooth tiles to porous wood, from metal surfaces to biological tissues. Different media have significant differences in their ability to adsorb and retain bloodstains. The sensitivity of luminol reagent is not limited by the type of medium, and its molecules can penetrate into the gaps between wood fibers, ceramic tile gaps, or deep in fabric fluff, reacting with hidden hemoglobin. Even if trace amounts of blood on the steering wheel, seats, and other areas inside the vehicle are covered with leather or fabric, the reagent can penetrate the surface material and trigger fluorescence, providing a continuous chain of evidence for tracking the suspect's activities.

Product packaging

The luminol reagent produced by Hubei Xindesheng Material Technology Co., Ltd. can reach over 99% and has a white powder like appearance. Desheng has rich R&D and production experience, and has cooperated with numerous domestic and foreign enterprises and laboratories, receiving high praise from customers! If you have any purchasing needs in the near future, please feel free to contact me at any time!