Over the years, Hollywood movies and TV shows have introduced audiences to various forensic tools and techniques for solving crimes.

We see that through DNA testing, we can immediately target the suspect, and only need a cotton swab to find the evidence of the suspect.

Despite these fictional crime scene investigations（CSI）Technology is as incredible as magic, but in recent years, there have been some technological breakthroughs in the field of CSI evidence collection, especially in DNA extraction and purification.

In the past few decades, suspect in most cases have been convicted because DNA test results provide strong and irrefutable evidence for determining their participation in crime.

After years of criminal litigation practice, DNA testing and identification have become effective unified identification techniques in the field of forensic science.

This applies particularly to homicide cases.

In murder cases, blood, semen, hair, and other human biological samples can make the case clear at a glance. Although there are indeed some exceptions and limitations, it is widely believed that DNA evidence is reliable at present.

With the passage of time and exposure, the risk of deterioration in the composition of biological materials increases dramatically, such as evidence at crime scenes becoming corrupted or even contaminated.

So, before criminal evidence is brought into the laboratory, forensic investigators will conduct preliminary testing or screening of the biological evidence at the scene, from hats and masks to bedding, clothing, and even a toothpick.

The identification of DNA requires a sufficient number of pure samples.

So extraction and purification are steps in forensic testing, and they are also critical steps. Chelex 100、Phenol chloroform methodMagnetic beads, salt precipitation, and alkaline extraction(NaOH Sodium Hydroxide)These are the five commonly used methods in crime laboratories.

The extraction process typically involves material preparation, followed by cell or cell membrane fragmentation to release and isolate DNA content from the collected sample.

Once the DNA is isolated, forensic laboratory technicians can perform nucleic acid purification, such as removing impurities through salting out protein precipitation.

Among them, the quality of centrifugal separation is the key to forensic DNA extraction work, which directly affects the results.

A centrifuge uses centrifugal force to separate liquids of different concentrations(such as blood cells and plasma cells)Separate. Under high-speed rotation, the sample fragments gradually precipitate to the bottom of the test tube, thereby separating DNA from the solution.

The centrifugation results are influenced by several technical indicators, includingspeedanddurationAnd the important factor istemperature control.

Phenol chloroform methodExtracting DNA can illustrate this point, as it is commonly used to extract DNA from blood.

Set the centrifuge temperature to 4 ° C(or 39.2 ° F)It can effectively remove proteins and other impurities while maintaining the integrity of DNA band spectra.

In contrast, non freezing desktop high-speed centrifuges may cause DNA breakage during the centrifugation process, and the heat generated by the high-speed rotation of the rotor during centrifugation may also degrade DNA samples.

The performance of laboratory equipment can help forensic investigators to analyze the crime scene, so as to help them find suspect.

A small temperature change can alter the results of DNA testing - therefore, when conducting DNA sample separation experiments, it is necessary to choose a temperature controlled freeze centrifuge.

OHAUS FC5515R high-speed freeze centrifugeIt has a powerful refrigeration system and temperature compensation function, which can provide reliable and high-quality results.

During its research and development phase, FC5515R rigorously measured the temperature difference between the centrifuge chamber and DNA samples under different conditions.

And based on the test results, a specialized temperature compensation model will be designed for it, which will be built into the central software system of the centrifuge together with the sensor.

The powerful refrigeration system of FC5515R ensures that the temperature of the rotor can still be maintained within the required range during high-speed operation.

The performance of the refrigeration and temperature control system is also a standard quality feature of the Ohhaus freezing series centrifuge.

Ohhaus desktop centrifuge, manufactured in Germany, provides protection for biological sample separation!

Buy now,You can also get a mini centrifuge or mini vortex analyzer as a gift!

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