Wuhan Desheng Biochemical Technology Co., Ltd

The application of liquid biopsy technology in prenatal screening and tumor detection is becoming increasingly widespread, and sample quality is the basis for determining the accuracy of test results. The content of free DNA in blood is extremely low and easily degraded. How to stably preserve these trace nucleic acids has become a practical problem in clinical testing. Free DNA preservation solution is a professional solution developed to meet this demand, ensuring the integrity of samples from collection to testing by inhibiting nucleases, protecting white blood cells, and preventing red blood cell rupture. Appearance and Sterility Requirements The free DNA preservation solution first needs to meet the basic quality indicators. The appearance of the product should be a colorless, clear and transparent solution, and the contents can be clearly observed during visual inspection without the presence of foreign impurities. This requirement not only reflects the standardization of the production process, but also facilitates users to quickly determine whether the preservation solution is in a normal state before operation. Sterility is another basic requirement, and the preservation solution undergoes sterilization treatment during the production process to ensure that no exogenous microbial contamination is introduced into the blood sample. The core function of stabilizing free DNA The primary task of the preservation solution is to stabilize free DNA in the blood. After the collection of blood samples, the free DNA originally present in the plasma faces multiple threats, among which the most important is the degradation effect of nucleases. Nucleic acid enzymes are widely present in blood components and can break down free DNA into small fragments, leading to a decrease in the concentration of the target test substance. Nucleic acid enzyme inhibitors are added to the free DNA preservation solution, which can take effect at the moment of blood collection, inhibiting the activity of nucleic acid enzymes and protecting free DNA from degradation. Within the temperature range of 4 to 37 degrees Celsius, blood samples treated with preservation solution can be stably stored for up to 14 days, providing ample time window for sample transportation and testing arrangements. Avoid contamination of the somatic genome The core requirement of free DNA testing is that the measured DNA molecules are derived from free fragments in plasma, rather than genomic DNA released after blood cell rupture. White blood cells contain a large amount of genomic DNA inside. Once white blood cells rupture, these high molecular weight DNA will be released into the plasma, significantly altering the composition and concentration of free DNA and seriously interfering with the authenticity of detection results. The second core function of free DNA preservation solution is to protect the integrity of white blood cells. By maintaining the stability of the cell membrane and a suitable osmotic pressure environment, the preservation solution prevents the rupture of white blood cells during storage and transportation, thereby avoiding the release of genomic DNA from white blood cells into the plasma. This allows the concentration of free DNA in the plasma to remain constant, accurately reflecting the original state at the time of collection. Effectively prevent hemolysis The rupture of red blood cells can lead to hemolysis, and the released hemoglobin not only makes the plasma appear red, but also releases various enzymes and nucleic acid substances inside the red blood cells, which interfere with free DNA detection. The third function of free DNA preservation solution is to protect red blood cells from rupture and prevent hemolysis. This function also relies on the protective effect of the preservation solution on the cell membrane and precise regulation of osmotic pressure. Application scenarios and advantages Free DNA preservation solution is widely used in prenatal screening and tumor detection projects. In prenatal screening, non-invasive prenatal testing is performed by detecting fetal free DNA in the plasma of pregnant women; In tumor detection, early screening and treatment monitoring are carried out by detecting circulating tumor DNA in the patient's plasma. Compared to ordinary blood preservation solutions, free DNA preservation solutions solve the problem of timely processing of samples, greatly simplifying storage and transportation conditions, allowing samples to be stored stably over a wide temperature range, reducing logistics difficulties and testing costs. The shelf life of the storage solution is one year, which facilitates inventory management in the laboratory.    

Serum separation gel is a key material for achieving liquid-liquid phase separation in blood collection tubes. It stabilizes between serum or plasma and blood cells after centrifugation with precisely controlled specific gravity, forming a dense isolation barrier. The use of separation gel alone can already meet conventional detection needs, while when combined with different additives, separation gel has evolved into specialized tube types for special detection scenarios. SST coagulation tube: accelerates serum separation SST tube is one of the most common application scenarios for separating adhesives. Simultaneously add coagulant and serum separation gel into the tube. After blood collection, coagulants accelerate the coagulation process and significantly reduce sample waiting time. After the blood has completely coagulated, centrifuge and transfer the separation gel between the serum and the blood clot. Clear serum can be directly used for biochemical, immunological, and other testing projects without the need for lid opening transfer, which not only improves efficiency but also reduces the risk of aerosol contamination. PST plasma separation tube: safeguarding the stability of plasma components Unlike SST tubes, PST tubes use anticoagulants such as lithium heparin or sodium heparin combined with serum separation gel. Anticoagulants prevent blood clotting, and after centrifugation, plasma is obtained instead of serum. Separation gel also forms a barrier between plasma and blood cells, ensuring the stability of plasma components during transportation and storage. For scenarios that require rapid detection of electrolytes, enzymes, or drug concentrations in plasma, PST tubes provide a reliable treatment solution. PRP Rich Small Plate Plasma Tube: Accurate Extraction of Platelets The design of PRP tube is more refined. Add EDTA anticoagulant and serum separation gel inside the tube. EDTA achieves anticoagulation by chelating calcium ions, while maintaining the original morphology of blood cells effectively. After centrifugation, the separation gel clearly separates the upper platelet rich plasma from the lower red and white blood cells. This tube type can obtain a higher concentration of platelet suspension for platelet function analysis or preparation of platelet rich plasma products. CPT monocyte isolation tube: isolate specific cell populations CPT tube is a type of blood collection tube with stronger functionality. It also uses a combination of anticoagulant and separation gel, but its design goal is to separate lymphocytes and monocytes in whole blood. Under the precise control of centrifugal force, the mononuclear cell layer aggregates in a specific area above the separation gel, facilitating subsequent extraction. This type of blood collection tube is widely used in scenarios that require high cell purity, such as immunological monitoring, cell therapy research, and viral load detection. Nucleic acid testing tube: ensuring the quality of nucleic acid extraction Nucleic acid testing requires extremely high sample quality, and any contents released by the rupture of blood cells may interfere with amplification testing. In nucleic acid detection tubes, separation gel combined with a specific anticoagulant system can quickly and completely isolate plasma from cellular components after centrifugation, avoiding the sustained impact of cellular metabolism or degradation on nucleic acids. This design ensures the long-term stability of plasma components, supports sample transportation, storage, and subsequent amplification testing. The functional boundary of the separation gel continues to expand from serum separation in SST tubes to monocyte enrichment in CPT tubes. By flexibly combining with coagulants and anticoagulants, the same type of separation gel material can serve various application scenarios from conventional biochemistry to cell therapy. Understanding the design logic of different tube types can help blood collection tube manufacturers and inspection departments make precise selections based on their own needs. Hubei Xindesheng Material Technology Co., Ltd. focuses on the research and production of blood collection tube additives such as serum separation gel. We have advanced production equipment and a professional R&D team, strictly controlling product quality to ensure that each batch of serum separation gel can meet the strict requirements of different medical scenarios. Choosing Hubei Xindesheng means choosing professionalism, stability, and reliability. Come and consult us now!  

Heparin sodium, as a blood anticoagulant widely used in blood collection vessels, has a direct impact on the safety and effectiveness of end use due to its product quality. In the production and quality control process, absorbance, clarity, specific rotation, and pH value are four routine and important detection indicators. Understanding the meanings of these indicators can help users better assess the quality level of raw materials. Absorbance: Measuring impurities and purity Absorption is a fundamental physical quantity in optical analysis. When a beam of light passes through a solution, the substances in the solution absorb a portion of the light energy, resulting in a decrease in the intensity of the emitted light. The absorbance is an indicator used to measure the degree of absorption of this type of light. For heparin sodium, absorbance detection is mainly used to evaluate the content of insoluble particles or chromogenic impurities in the product. The lower the absorbance value, the higher the purity of the product and the less impurities remain. Clarity: Ensure the pure appearance of the solution Clarity mainly checks whether the solution is turbid, that is, the turbidity caused by suspended particles in the solution. In the use scenario of heparin sodium, especially when the product needs to be prepared as a blood collection tube coating solution, good clarity means that there are no insoluble substances that interfere with subsequent detection, which can ensure the uniformity and safety of the liquid. Specific rotation: Reflecting molecular structure and configuration Specific rotation is an indicator for measuring the properties of optically active substances. When plane polarized light passes through a solution containing optically active compounds such as sodium heparin, the molecular structure of the substance will cause the plane of the polarized light to rotate and deflect to the left or right by a specific angle, which is called the rotation angle. Specific rotation is the optical rotation ability calculated under specific conditions, such as specified temperature, concentration, and optical path length. Heparin sodium is a polysaccharide substance, and changes in its molecular structure or the introduction of impurities can have a significant impact on the numerical value of its helical rotation. Therefore, monitoring the specific rotation is an effective means to verify whether the chemical structure of heparin sodium is complete and whether it is consistent between batches. PH value: Measuring acid-base balance The pH value is a scale used to measure the acidity or alkalinity of a solution, typically ranging from 0 to 14, where 7 is neutral, less than 7 is acidic, and greater than 7 is alkaline. The pH value of heparin sodium solution directly affects its compatibility and stability in different systems. For example, when heparin sodium is used for blood collection tube coating, if the pH value deviates from the expected range, it may affect the stability of the blood sample or interfere with subsequent biochemical testing. Meanwhile, an appropriate pH value also helps maintain the chemical stability of heparin sodium molecules themselves, preventing their degradation during storage. The collaborative significance between indicators These four indicators are not isolated, they constitute a comprehensive evaluation of the quality of heparin sodium from different dimensions. Absorbance and clarity focus on physical purity, specific rotation focuses on the correctness of molecular structure, and pH value focuses on the suitability of chemical environment. Any abnormal fluctuation of any indicator may indicate that a certain link in the production process needs to be adjusted. For users, regularly checking the testing reports provided by suppliers to confirm that all four indicators are within the qualified range is a necessary step to ensure stable and reliable quality of raw materials. Hubei Xindesheng Material Technology Co., Ltd. specializes in the production of heparin sodium and other blood collection tube additives. With a professional technical team, we can provide customers with detailed product quality inspection reports to ensure that every parameter indicator of the product meets relevant standards. If you have any recent purchasing needs, please click on the official website to learn more details or contact me directly!  

Blood coagulants are the core components in blood collection vessels that accelerate blood coagulation, and their performance directly affects the efficiency of serum separation and the accuracy of subsequent testing. Evaluating the suitability of a coagulant should not only focus on its coagulation speed, but also comprehensively consider five aspects: coagulation time, coagulation efficiency, coagulation effect, separation effect, and its impact on blood components. These five dimensions are interrelated and together determine the actual use value of the product. Coagulation time and efficiency The coagulation time refers to the time required for blood to completely coagulate after coming into contact with a coagulant, which is the most intuitive performance indicator. The shorter the time, the faster the coagulation process starts, and the shorter the sample processing cycle. For emergency testing scenarios that require rapid reporting, differences in coagulation time can directly affect work efficiency. The coagulation efficiency focuses on the relative amount of coagulant required to achieve the optimal coagulation effect. Efficient coagulants can achieve ideal solidification speed with minimal addition. This not only reduces the cost of raw materials, but also minimizes the interference of foreign components on blood samples. The coagulation time and efficiency need to be considered in combination: some products require a large amount of addition to achieve rapid coagulation, while others can achieve the same effect with a small amount of addition, and the comprehensive advantages of the latter are more obvious. Condensation effect and separation effect The coagulation effect mainly tests the amount of serum leakage after blood coagulation. After complete coagulation of blood, a blood clot will form, and when the clot contracts, it will squeeze out the serum. A coagulant with good coagulation effect can cause blood clots to fully contract, resulting in a large and rapid amount of serum leakage, thereby increasing the serum yield per unit volume of blood. If the coagulation effect is poor, the serum will be wrapped in loose blood clots and cannot be effectively separated, resulting in sample waste. The separation effect is a comprehensive reflection of the performance of coagulants. After coagulation, the blood needs to be centrifuged to achieve complete serum separation and clear interface. The ideal separation effect is a clear and transparent serum layer, a dense and intact blood clot layer, a clear boundary between the two, and no hemolysis phenomenon. Hemolysis refers to the rupture of red blood cells leading to the release of hemoglobin into the serum, which can cause the serum to appear red and interfere with the detection of multiple biochemical indicators. When evaluating the separation effect, it is necessary to carefully observe whether the serum color is normal and whether the interface is smooth. The impact on essential components of blood This is the most easily overlooked but equally important evaluation dimension. The use of coagulants should not have harmful effects on the clinical test results of blood and the performance quality of blood products. This means that coagulants and their products after reacting with blood should not interfere with the accuracy of subsequent testing results. For example, certain coagulants may affect electrolyte determination, enzyme activity testing, or hormone immunoassay. When evaluating a coagulant, it is necessary to confirm that its interference level with common clinical testing items is within an acceptable range. For scenarios used in the production of blood products, it is also necessary to investigate whether residual coagulants affect the quality and safety of the products. Hubei Xindesheng Material Technology Co., Ltd. specializes in the production of blood collection tube additives such as coagulants. With a professional technical team, we can provide customers with detailed product quality inspection reports to ensure that every parameter indicator of the product meets relevant standards. If you have any recent purchasing needs, please click on the official website to learn more details or contact me directly!