Wuhan Desheng Biochemical Technology Co., Ltd

Serum separation gel is a key material for achieving physical isolation between serum and blood cells in blood collection vessels. At present, the separation adhesives on the market are mainly divided into two categories: acrylic ester system and resin system. There are significant differences between the two in terms of raw material composition, production process, and performance. Understanding these differences can help blood collection tube manufacturers make reasonable choices based on their own needs. The development process of acrylic ester system Acrylic ester system is an early type of separation adhesive used in blood collection tubes. Due to production process limitations, early products had a clear weakness - they could not tolerate radiation sterilization. Blood collection tubes need to be sterilized before leaving the factory. If they cannot be irradiated, it means that the tube cannot achieve a sterile state, which will have an impact on subsequent blood sample storage and testing results. With the continuous improvement of the process, the separation adhesive of acrylic ester system has gradually solved the problem of radiation resistance. After formula optimization, the product can withstand irradiation sterilization without performance degradation, and the aging rate is significantly reduced. The shelf life can be extended to three years. This progress has led to the widespread application of acrylic ester systems in the field of blood collection tubes. In terms of appearance, the separation adhesive of acrylic ester system was mainly transparent in the early stage. In practical use, some products may experience blood entrapment when centrifuged before the blood has completely coagulated - that is, blood cells are carried through the separation gel layer and enter the serum area. Meanwhile, due to the hydrophilicity of acrylic materials, long-term contact with water in the blood may lead to a slow shift in pH value. After subsequent improvements, the above-mentioned issues have been effectively controlled. The appearance options are also more diverse, with semi transparent and opaque products appearing one after another. The pH drift problem caused by hydrophilic properties can be solved by adjusting the formula, and the pH value can remain stable even after long-term exposure to the blood environment. Performance improvement of resin system With the increasing demand for sample quality in clinical testing and the emergence of new application scenarios such as cosmetic medicine, serum separation gels need to meet higher standards. The resin system is a new type of separation adhesive material developed in this context. The most significant feature of the resin system is the use of hydrophobic materials instead of traditional hydrophilic acrylic esters. Hydrophobic properties bring several direct performance improvements: the material will not undergo changes in properties due to water infiltration when in long-term contact with blood, has stronger resistance to hydrolysis, and can maintain its original physical form. In terms of specific gravity adjustment, the resin system has greater adjustment space and can more accurately match the density values required for different blood collection tube designs. Compatibility of reagents is another key indicator in the selection of separation gels. The resin system separation gel can coexist well with commonly used anticoagulants such as heparin and EDTA, without interfering with each other, and each plays its due role. This is particularly important for blood collection vessel types that require the simultaneous use of separation gel and anticoagulant. In terms of solvent resistance and long-term stability, resin systems perform more outstandingly compared to acrylic systems, especially suitable for scenarios with high requirements for shelf life and extreme transportation conditions. Selection Suggestions Acrylic ester system and resin system each have applicable scenarios. The acrylic ester system has undergone years of development, mature technology, relatively controllable cost, and is suitable for the production of conventional blood collection tubes. Resin systems have advantages in long-term stability, reagent compatibility, and customized appearance, and are used for high-end blood collection tubes or special application scenarios. Hubei Xindesheng Material Technology Co., Ltd. has been deeply involved in serum separation gel for many years. Both acrylic acid and resin system separation gels are available for sale. With years of research and development experience, the production process of separation gel is stable, with small batch differences and all indicators meeting relevant requirements. If you have any related procurement needs in the near future, please feel free to purchase!  

In clinical blood testing, the selection of anticoagulants is a key factor that directly affects the accuracy of the test results. Different anticoagulants have different mechanisms of action and scope of application, and incorrect selection may lead to nucleic acid degradation, pseudoprolongation of clotting time, or measurement deviation of blood cell volume. Understanding the characteristics and limitations of various anticoagulants can help make more reasonable judgments during the testing design phase. Why does whole blood nucleic acid extraction avoid heparin Heparin lithium and heparin sodium are commonly used anticoagulants, but they have significant limitations in blood collection for nucleic acid extraction purposes. Heparin binds to membrane proteins on the surface of the cell membrane, causing changes in membrane permeability that may affect subsequent nucleic acid release efficiency. Heparin can also bind and activate various proteasomes and complement systems in whole blood, producing a series of enzymatic effects that can easily lead to nucleic acid degradation and reduce the acquisition rate of nucleic acids. The effect of extracting nucleic acids from heparin anticoagulated whole blood samples stored at room temperature is often unsatisfactory. The interference of heparin is not only limited to the extraction stage, but also affects subsequent PCR detection. Heparin may affect the activity of DNA polymerase or interfere with the accuracy of magnesium ion concentration in the reaction system, leading to a decrease in amplification efficiency or the appearance of non-specific bands. Therefore, heparin is not an ideal choice in scenarios involving nucleic acid extraction and amplification testing.  Selection of Sodium Citrate Concentration in Coagulation Testing Sodium citrate is the standard anticoagulant in coagulation function testing. There are two concentrations of sodium citrate solutions, 3.2% and 3.8%, available on the market. Although it was initially believed that both could be used, practical verification has shown that the 3.8% concentration of anticoagulant poses more risks. 3.8% anticoagulants are more likely to cause false prolongation in calcium dependent coagulation tests such as PT and APTT, especially in cases where the sample size is insufficient or the red blood cell ratio is high, resulting in a relative decrease in plasma volume. If the ratio of anticoagulants to blood exceeds the recommended ratio of 1:9, higher concentrations of anticoagulants will further exacerbate this deviation. In the vast majority of clinical scenarios, a concentration of 3.2% sodium citrate is a more reliable choice. Only in special blood samples with very few red blood cells, a concentration of 3.8% shows certain advantages. But this rare situation can be solved by adjusting the proportion of anticoagulants, and there is no need to change the concentration commonly used for small probability scenarios. Therefore, after clinical practice testing, the 3.2% concentration of sodium citrate has gained wider recognition. The effect of EDTA salt on blood cell volume EDTA salts exhibit excellent anticoagulant effects, but they are not without interference. All EDTA salts can cause blood cell shrinkage, thereby affecting the trace hematocrit after centrifugation. The difference between different EDTA salts is reflected in their solubility, with potassium EDTA having a higher solubility than sodium EDTA, making potassium EDTA more commonly used. The pH values of EDTA disodium salt and EDTA dipotassium salt are relatively lower than EDTA tripotassium salt. In this acidic environment, cells will swell, and this swelling effect can partially compensate for cell shrinkage caused by osmotic pressure. For the calibration of electronic blood cell counters, using EDTA disodium salt and EDTA dipotassium salt as anticoagulants yields hematocrit values that are closer to the true values than using EDTA tripotassium salt. This difference is worth noting in scenarios where precise measurement of average blood cell volume is required. Hubei Xindesheng Material Technology Co., Ltd. is a professional manufacturer of blood collection tube additives. Currently, the blood collection tube anticoagulants on sale include heparin sodium, heparin lithium, EDTA dipotassium, EDTA tripotassium, EDTA disodium, sodium citrate, etc. Everyone can purchase different anticoagulants according to their own needs. If you have any recent purchasing needs, please click on the official website to learn more details or contact me directly!

In the field of in vitro diagnostics, the core raw materials of pancreatic disease detection kits have long relied on imports. EPS-G7 amylase substrate and DGGR lipase substrate are key components of this detection project, and their supply stability and quality directly affect the reliability of testing in many clinical laboratories in China. In recent years, with the improvement of local enterprises' technological capabilities, these two high-end enzyme substrates are gradually being localized. The centralized procurement policy forces the upgrading of raw materials After multiple rounds of procurement in the field of in vitro diagnostics, the industry's focus has shifted from simple price competition to a comprehensive balance between quality and cost. The mainstream biochemical testing projects for liver function, kidney function, pancreatic function, etc. have undergone multiple price adjustments, and the industry has accumulated a market size of tens of billions of yuan and undergone redistribution. In this context, the profit margin of reagent production enterprises is compressed, while ensuring that product quality does not decline. The procurement cost and quality control of core raw materials have become key factors affecting competitiveness, providing a window for domestic high-end raw material suppliers to enter the market. Clinical demand for pancreatic disease detection Acute pancreatitis is a common clinical acute abdomen, and the incidence rate is on the rise. Severe patients have a dangerous course of illness, and early diagnosis is crucial for improving prognosis. The combined detection of alpha amylase and lipase is currently recognized as a routine combination for the diagnosis of pancreatitis in clinical practice. Starch enzymes rapidly increase in the early stages of the disease and are a good early screening indicator; Lipase has stronger tissue specificity, longer duration of elevation, and higher sensitivity and specificity in the diagnosis of acute pancreatitis. The combination of the two can provide valuable diagnostic information at different stages of onset. EPS-G7 is an internationally recognized substrate for amylase detection, while DGGR is a highly specific chromogenic substrate for lipase detection. The quality of the two substrates directly affects the reliability of the detection results. If the purity of the substrate is insufficient or there are significant differences between batches, it will directly lead to deviations in the test results of the kit, which in turn will affect clinical decision-making. Technological breakthroughs in synthetic processes The molecular structures of EPS-G7 and DGGR are complex, with multiple synthesis steps and high purification difficulty. For a long time, there has been a lack of suppliers in China who can consistently produce high-quality products. Some early domestically produced products had issues such as high impurities and poor batch consistency, making it difficult to meet the strict requirements of clinical testing. Hubei Xindesheng has systematically optimized the synthesis routes of EPS-G7 and DGGR based on years of technological accumulation in the field of enzyme preparations. By improving the purification method of key intermediates and the crystallization process of the final product, the content of key impurities has been effectively controlled. The purity of EPS-G7 product can reach over 98%, and the key impurity free p-nitrophenol is controlled at an extremely low level, ensuring that the background signal of the detection reaction is not interfered with. The isomer content and free chromophores of DGGR are also strictly controlled, ensuring the specificity and sensitivity of the lipase detection method. Mass production capability and supply chain security Realizing stable mass production at the kilogram level is the key threshold for domestic raw materials to truly enter the mainstream market. Hubei Xindesheng Material Technology Co., Ltd. has the ability to produce two substrates on a large scale, which can meet the bulk procurement needs of downstream reagent manufacturers. For reagent production enterprises, choosing validated domestic raw material suppliers can reduce procurement costs and supply chain risks while ensuring quality. With the continuous promotion of the centralized procurement policy, the importance of ensuring the safety of raw material supply will be further highlighted. If you have any recent purchasing needs, please click on the official website of Desheng to learn more details!      

In clinical biochemical testing, alpha amylase activity detection is a fundamental item for screening and diagnosing pancreatic diseases. The accuracy of this test result largely depends on the quality of the substrate used. EPS-G7, as a specialized substrate for amylase determination recommended by the International Federation of Clinical Chemistry, has become one of the most recognized reaction systems in this testing project. The name and structure of EPS-G7 The full name of EPS-G7 is 4,6-ethylene-p-nitrophenyl - α - D-maltoside. Its molecule consists of two parts: a maltose chain consisting of seven glucose units, and a p-nitrophenyl group as a chromogenic reporter group. 4,6-Ethylene modification plays a crucial role in blocking. Visually, EPS-G7 is a white to light yellow powder with good water solubility, making it easy to quickly prepare into a homogeneous substrate solution in a buffer solution. The working principle of EPS-G7 EPS-G7, as a substrate, does not directly generate color signals, but indirectly completes detection through enzymatic reactions. When alpha amylase is present in the sample, it hydrolyzes the glycosidic bonds in EPS-G7 molecules, producing intermediate products of p-nitrophenyl oligosaccharides. This intermediate product is then further hydrolyzed by alpha glucosidase pre added to the reaction system, releasing p-nitrophenol. Under alkaline conditions, p-nitrophenol appears yellow. By measuring the rate of change in absorbance at a wavelength of 405 nanometers, the activity of alpha amylase in the sample can be calculated. The key difference between EPS-G7 and early PNP-G-7 substrates is the 4,6-ethylene modification. This modification blocks the non reducing end, effectively preventing the direct hydrolysis of intact substrates by alpha glucosidase, ensuring that the chromophore is only released when the alpha amylase cleaves the sugar chain. This design significantly reduces background interference and improves detection specificity. Clinical application scenarios of EPS-G7 EPS-G7 is mainly used for quantitative detection of alpha amylase activity in human serum, plasma, or urine in vitro. In clinical practice, amylase detection has clear application value: rapid increase of amylase is an important warning signal during the initial screening of acute pancreatitis; Patients with chronic pancreatitis may experience fluctuations in amylase levels; When salivary glands become suppurative or glandular ducts become blocked, amylase enters the bloodstream through the lymphatic pathway, leading to an increase in serum levels; The auxiliary diagnosis of mumps often refers to amylase indicators. In addition, the results of amylase testing have reference significance for the differential diagnosis of acute abdomen and the comprehensive evaluation of pancreatic function. Quality requirements for EPS-G7 The purity of EPS-G7 directly determines the reliability of the detection results. The standard purity of the product is set to not be less than 95%, but high-quality products can maintain a stable purity of over 98%. Impurity control is equally crucial: free p-nitrophenol can contribute to background absorbance even at trace levels, leading to higher detection results; PNPG7 is an intermediate that may remain during the synthesis process and needs to be strictly controlled within a certain range. The lower the impurity level, the lower the blank signal of the reagent, and the higher the detection sensitivity. Storage and use EPS-G7 needs to be stored in dark and dry conditions at minus 20 degrees Celsius, with a shelf life of 2 years. The correct storage conditions ensure that the product maintains chemical integrity during its shelf life, avoiding performance degradation caused by hydrolysis or oxidation. When in use, the substrate usually needs to be dissolved in a specific buffer system and prepared and added according to the instructions in the kit manual. Xindesheng can provide EPS-G7 products that meet high-purity standards to meet the production needs of amylase detection kits. Recommended manufacturer Hubei Xindesheng Material Technology Co., Ltd. was established in 2005 and laid out the research and development of IVD core raw materials in 2012. It has now built a complete industrial chain platform from chemical synthesis, process optimization to large-scale production. At present, EPS-G7 has achieved stable mass production in kilograms and can provide free samples for downstream reagent manufacturers to test and verify. If you have any related procurement needs, please feel free to contact me at any time!