China Wuhan Desheng Biochemical Technology Co., Ltd Company News

Bicine is an amphoteric amino acid buffer. It is active in the range of pH 7.6-9.0 (PKA = 8.3 at 25 ° C). Recommended buffer for low temperature biochemical work. Bicaine was used to prepare stable serum guanosine substrate solution. A method of protein separation using dihydropyridine in thin layer ion exchange chromatography has been reported. Dihydropyridine has been used for peptide and protein crystallization.   In biochemical research, buffer solution is often used to maintain the pH value of experimental system. The change of pH value of solution system in research work often directly affects the effect of our work. If the pH value of extraction enzyme experimental system changes or changes too much, the enzyme activity will decrease or even completely inactivate. Therefore, we should learn to prepare buffer solution     Standard for finished buffer   Preparation method of bicine solution (about 1-2l) (1) 0.1M solution (a): bicine 16.317g/deionized water 1000ml (2) 0.1M NaOH solution (b): 4G NaOH / 1000ml deionized water (3)pH 5.1 1,000ml(A)+0ml(B) (A):(B)=5:0 pH 7.8 1,000ml(A)+200ml(B) (A):(B)=5:1 pH 8.2 1,000ml(A)+400ml(B) (A):(B)=5:2 pH 8.6 1,000ml(A)+600ml(B) (A):(B)=5:3 pH 10.4 1,000ml(A)+800ml(B) (A):(B)=5:4   * temperature 20 degrees. * if you need to adjust to a specific pH, use a pH meter. * if you don't want to join Na, please use KOH.   Hubei xindesheng Material Technology Co., Ltd. specializes in the production of various biological buffers, including Tris, Tris HCl, bicine, caps, mops, taps, EPPs, MOPSO, HEPES, pops, if necessary, please contact us for details.

Carbomer is a popular raw material in the chemical industry. It is a high-molecular polymer material. It is usually used as a thickener, gel, and suspending agent in creams and emulsions for daily chemical products. It is also listed in the Pharmacopoeia. Pharmaceutical auxiliary materials are used as dispersants, diluents or carriers for medicinal ingredients, as well as additives for animal feed in food.   The reason why carbomer has a good gel and thickening effect is because of its special molecular structure. Carbomer is a kind of polyacrylic acid material, which can also be regarded as carboxyvinyl. The bond position for polymerization is the carbon-carbon double bond of olefin, and the carboxyl group remains.                                                                     Carbomer gel performance and stability judgment   When the carbomer dissolves in water, the carboxyl group ionizes the hydrogen ion and shows a negative charge. The carboxyl group and the carboxyl group in the molecule repel each other with the same charge, so that the molecule slowly expands, which makes the carbomer have good swelling properties in water . It takes a long time for water molecules to diffuse into the carbomer molecules, and after swelling, a gel with a higher viscosity will be formed. When the pH is 6-11, the viscosity of the gel is relatively high. When the pH is 8, the carboxyl groups in the molecule are basically completely dissociated, the repulsive force in the molecule increases to the maximum, and the viscosity reaches the maximum.   When carbomer is dissolved in water to prepare a gel, it is best to soak it in deionized water for 24 hours, and then mechanically stir it for half an hour. Neutralizing carbomer usually uses triethanolamine and EDTA-2Na as gel stabilizers. The presence of the hydration film on the surface of the carbomer gel makes the gel relatively stable. The greater the degree of dissociation of the carboxyl group, the less free water content in the gel and the less likely to grow bacteria. The degree of hydration of the gel can be judged by the sliding time of the gel on the wall of the beaker. Products with the same viscosity but different hydration speeds indicate different gel stability.   From the above content, it can be concluded that the gel performance or viscosity of carbomer is adjusted by the pH value of the gel, and the viscosity is maximum when the optimal pH value is reached; the stability of the gel can be determined by the degree of hydration. Judge, and adjust and control. The carbomers produced by Desheng are divided into 940 and 980 types, which can be selected according to their own needs and sample test conditions.

Biological buffer raw materials play an important role in numerous biochemical and bioengineering applications. To determine whether a biological buffer raw material has expired, multiple factors such as appearance, chemical properties, performance, storage conditions, and supplier information need to be considered comprehensively. In practical applications, any buffer raw materials suspected to be expired or have quality issues should be tested and evaluated from multiple perspectives to ensure smooth experimentation or production, and to avoid experimental failure or product quality problems caused by the use of expired buffers. Appearance inspection 1. Color change: Many biological buffering agents have specific colors under normal conditions. For example, various buffer materials such as Tris, HEPS, CAPS, etc. appear white. If there is a significant change in the color of the buffer raw material, such as yellowing, browning, or turbidity or precipitation of the prepared solution, it is likely that it has undergone chemical changes or been contaminated, which is an important sign of expiration or deterioration. 2. Physical form change: Normal biological buffering agent raw materials may be in powder form. If the powder form raw materials have clumping, and the crystalline form raw materials have obvious deliquescence or deformation, it may indicate that their quality has changed. For example, the clumping of powdered buffering agents may be due to the absorption of moisture from the air, which can alter their solubility and buffering capacity in solution, thereby affecting their application effectiveness in experiments or production. Chemical property testing 1 PH measurement: The core function of biological buffering agents is to maintain the stability of the pH value of the solution, so measuring their pH value is a key step in determining whether they have expired. Use an accurate pH meter to measure the pH value of the prepared buffer solution according to standard operating procedures. If the measurement result deviates significantly from the standard pH range of the buffer under normal conditions, it may indicate that the buffer has deteriorated. Perhaps due to the reaction between buffer molecules and substances in the environment, their acid-base balance changes, resulting in the loss of their original buffering capacity. 2. Purity analysis: Using appropriate analytical methods to detect the purity of buffer raw materials is also an important means of determining whether they have expired. Common methods include liquid chromatography (HPLC), gas chromatography (GC), mass spectrometry (MS), etc., which can accurately detect the content of the main components in the buffer and the presence of impurities. Performance testing 1. Buffer capacity measurement: Buffer capacity is an important indicator for measuring the performance of biological buffering agents. The buffering capacity can be determined by gradually adding a small amount of strong acid or strong base to the buffer solution, and then measuring the change in pH value of the solution. If the buffering capacity of the buffer is found to be significantly lower than its standard value, it indicates a decrease in its buffering capacity, which may be due to molecular structure changes caused by expiration or the influence of impurities. 2. The impact on biological systems: For some buffering agents used in biological experiments or production of biological products, their expiration can also be determined by observing their impact on the biological system. For example, in cell culture experiments, cells are placed in a medium containing a suspected expired buffer to observe their growth status, morphological changes, and other indicators. If cells experience slow growth, abnormal morphology, or massive cell death, it is likely that the buffer has expired and its quality changes have had adverse effects on the cells.   Supplier information and batch records 1. Production date and shelf life labeling: First, check the production date and shelf life information labeled on the packaging of the buffer raw material. This is the basic criterion for judgment, but it should be noted that the shelf life is an estimated value under specific storage conditions. If the actual storage conditions do not match the recommended conditions, even within the shelf life, it may have deteriorated. 2. Supplier Quality Control Record: Contact the supplier to obtain the quality control record for this batch of buffer. Some legitimate suppliers will conduct strict quality inspections on each batch of products, including the determination of purity, pH value, buffer capacity, and other indicators. By reviewing these records, we can understand the quality status of this batch of buffer at the time of leaving the factory, as well as whether there are any differences compared to previous normal batches. If the quality control records of the supplier show that some indicators of the batch are close to the critical value or have significant differences from the standard batch at the time of leaving the factory, then more caution should be taken when using it, and other testing methods should be combined to determine whether it has expired. As a manufacturer of biological buffer raw materials, Hubei Xindesheng always adheres to the concept of quality first. With advanced production technology and strict quality control system, we carefully screen raw materials and accurately control every aspect of production. Its products cover multiple types and can meet the needs of different biological experiments and industrial production. If you have any relevant intentions, please feel free to click on the website for consultation at any time!  

  Because enzymes have a good catalytic effect, professional enzyme preparation manufacturers will use scientific methods to extract enzymes and make them into enzyme preparations that can be used in a variety of industries. Although enzyme preparations have high safety in use, However, you should still pay attention to related matters when using it. Next, Desheng will give us a detailed introduction.     1. Pay attention to the type and dosage of use   There are many types of enzyme preparations, and the types of enzyme preparations used in the production of each industry are not exactly the same, mainly because different types of enzymes have different functions. For this reason, when companies use enzyme preparations, they must select the appropriate type of enzyme preparation according to the actual use and purpose of use and add it as appropriate, so as to avoid adding too much or too little to achieve the desired effect.   2. Pay attention to control temperature and pH   Since the essence of enzyme preparations is protein, it is said that as long as it is a factor that affects the protein, it will usually affect the activity of enzyme preparations. Therefore, when using the enzyme preparation produced by the enzyme preparation manufacturer, we must pay attention to the preservation and use of the temperature to avoid too much temperature and the loss of the activity of the enzyme preparation.   3. Keep away from heavy metal ions   In addition to improper temperature environment and pH value that will cause the activity of enzyme preparations to be lost, there are also heavy metal ions in some articles that react with enzyme preparations or combine with essential groups in them to cause enzyme preparations Lose its due activity. Therefore, the use of enzyme preparations must be careful to keep it away from heavy metal ions.   The purpose of using enzyme preparations in any industry is to improve the production quality and efficiency of products. Therefore, in addition to choosing trusted enzyme preparation manufacturers to purchase suitable products, companies must also add appropriate dosages according to the actual situation. In addition, it is necessary to create a good temperature and acid-base environment for the use of enzyme preparations to prevent enzyme preparations from losing activity. Desheng has dozens of enzyme preparation products, which are mainly used in biochemical testing and biochemical experiments. Compared with industrial Enzyme preparations have better purity and activity.

Name: n-ethyl-n - (2-hydroxy-3-sulfopropyl) - 3,5-dimethoxyaniline sodium salt,DAOS reagent CAS No.: 83777-30-4 Molecular formula: c13h20nnao6s Molecular weight: 341.36 Purity: 99% Moisture: ≤ 0.5% Less than 15 ppm Ignition residue: ≤ 0.1 Description white or light blue powder. Oxidizing chromogen reagent Store and transport at 2-8 ° C, sealed and protected from light   Daos white crystal powder   We usually keep the temperature of Daos at 0-5 ℃. However, in the process of use, we usually re seal the Daos which has not been used up, or replace the packaging bottle with a new one for sealing treatment. Otherwise, once the product absorbs moisture, it will lead to caking or beige color.   Our company packaged and wrapped DAOS in transportation process, wrapped it with pearl foam mattress, and then added 2-3 packages of ice to avoid high temperature during transportation and affect the characteristics of the product.   Daos is one of  the new Trinder's reagents. It is a highly water-soluble aniline derivative, which is widely used in diagnosis and biochemical tests. In the colorimetric determination of hydrogen peroxide activity, it has some advantages over the conventional chromogenic reagent   Our company strives to do a good job in the process of R & D, production, sales and transportation, and also in order to let customers feel at ease about our products, we Desheng technology to achieve: Based on sincerity, taking morality as the first, quality first, leading technology to serve the majority of consumers.

At present, the novel coronavirus control and prevention form is still very severe. As the first step in nucleic acid detection, the importance of sample collection and preservation is beyond doubt. The inspection industry often says "garbage in, garbage out (garbage specimen results)", the most important factor is sampling. If there is a problem with the sample collection, then the following work is done well, and the results are invalid. Choosing the right virus preservation solution and collection tube can make the new crown detection get twice the result with half the effort! At present, almost all virus preservation solutions on the market directly preserve live viruses, leading to a high risk of infection for medical staff in sampling, transportation and testing. In view of this situation, the first line of anti epidemic disease needs the sample preservation solution which can directly inactivate the virus. However, it should be noted that when inactivating the virus, we should also consider whether the preservation solution can stably preserve the integrity of virus nucleic acid To avoid the degradation of nucleic acid in the sample before detection, resulting in "false negative" of nucleic acid detection. Desheng contains no guanidine salt virus preservation solution to minimize the risk of "false negative".   We compared the effects of preservation solution containing guanidine hydrochloride, guanidine isothiocyanate and guanidine salt free preservatives at 37 ℃. The results showed that the main component was guanidine salt, the preservation effect was not ideal!   Under the same conditions of 37 ℃, the preservation efficiency of viral nucleic acid is basically 100% after 1-7 days of storage; however, the preservation efficiency of viral nucleic acid gradually decreases with the use of other two guanidine salt preservation solutions, and it is lower than 20% by the seventh day, indicating that RNA is undergoing severe degradation over time! Guanidine salt (guanidine isothiocyanate or guanidine hydrochloride, etc.) is a classical protein denaturant, which is often used for cell lysis in nucleic acid extraction, and can also achieve the effect of virus inactivation. However, guanidine salt does not have the ability to preserve viral nucleic acid at room temperature, which is easy to cause sample degradation. Therefore, it is not suitable for the preservation of new coronavirus samples. Therefore, it is strongly recommended that you choose non guanidine salt Components of the virus preservation solution.   Here, we appeal to the majority of medical workers to pay attention to the following aspects when selecting virus preservation solution if your sampling purpose is nucleic acid detection and you do not need to cultivate live virus:   1. The virus preservation solution can be used to inactivate the virus At present, nucleic acid detection is to detect the viral RNA in the sample, which needs to split the virus. Therefore, as long as the integrity and stability of the viral nucleic acid can be ensured, there is no need to preserve the live virus. Therefore, in the current situation of fighting against the new coronavirus epidemic situation, it is more ideal to inactivate the virus while collecting samples.   Some manufacturers have introduced inactivated preservation solution on the market, but the inactivated component is guanidine salt. The results of comparative experiments show that guanidine salt preservation solution does not have the ability to preserve virus nucleic acid at room temperature, which is easy to cause sample degradation and is not suitable for the preservation of new coronavirus samples. Therefore, we recommend virus preservation solution containing non guanidine salt protein denaturant It can inactivate the virus and ensure that the virus nucleic acid does not degrade at room temperature.   2. The volume of preservation solution in the sampling tube should be appropriate It is very important to select the appropriate volume of preservation solution: ① if each sample is sampled separately, it is recommended that you select a virus sampling tube with 1ml preservation solution. The sampling volume can not only meet the requirements of nucleic acid extraction and detection in the downstream, but also the virus concentration is three times higher than that of 3ml preservation solution! ② In case of large-scale preliminary screening and mixed detection, the swab samples of 3-5 people are placed in the same sampling tube. It is recommended that you select a virus sampling tube with 3ml preservation solution, so that the sample size can meet the demand of downstream nucleic acid extraction, improve the detection efficiency and reduce the detection cost.   3. Virus preservation solution that can be used to transport and store samples at room temperature Because of the instability of RNA, the traditional virus sampling tube needs to be transported to the laboratory within 48 hours under the condition of 4 ℃. If the transportation temperature is not up to the standard, it may cause the degradation of virus nucleic acid and lead to the "false negative" test result! In contrast, if kangweishiji can transport and keep the virus nucleic acid stably at room temperature, the problem of sample transportation can be solved, and the accuracy of detection results can be improved.   4. The virus preservation solution that can protect the sample from high temperature inactivation is used According to the relevant guidelines of the National Health Commission, the samples should be inactivated at high temperature (above 56 ℃ for 30min) before extracting viral nucleic acid. However, Beijing Center for Disease Control and prevention, Beijing Research Center for preventive medicine and other institutions are in clinical The paper published by chemistry showed that high temperature inactivation could lead to the degradation of viral nucleic acid, thus reducing the detection rate of viral nucleic acid, which was one of the reasons for the high false negative rate of nucleic acid detection of new coronavirus.   The results showed that high temperature inactivation had no significant effect on the integrity of coronavirus nucleic acid.   The virus preservation solution developed and produced by Desheng can be divided into inactivated and non inactivated types. Different preservation solutions are selected according to different experimental requirements and detection conditions. If you have any questions or needs, please call us for details. Choosing Desheng virus preservation solution is your right choice.

Heparin lithium is a chemical with a white to nearly white appearance. There was no significant difference in TP, Aso, UA, alt, Mg, Cl, TC and CRP between heparin lithium anticoagulant plasma and serum (P > 0.05). There were significant differences in HBD, LDH and TBA between heparin lithium anticoagulant plasma and serum (P < 0.05). Therefore, except for HBD, LDH and TBA, the correlation between heparin lithium anticoagulant plasma and serum is good. Therefore, it is feasible to use heparin lithium anticoagulant plasma instead of serum in life detection, which can be used as an important detection method.   Basic information of Desheng product heparin lithium Name: heparin lithium CAS No.: 9045-22-1 Purity: ≥ 150 USP units / mg Specification: 10g / bottle, 50g / bottle Storage and transportation: 2-8 ° C   [scope of application]   1. This product is suitable for the collection and anticoagulation of blood samples for clinical biochemical examination and emergency biochemical examination, as well as for blood sample collection and anticoagulation of some Hemorheology items. 2. It is recommended to use heparin lithium as anticoagulant when determining the ion content in blood, because it is the least likely to interfere with the determination of other ions. 3. This product is not a drug and cannot be used as an injection. It is forbidden to inject directly into human body and animal body.   [precautions]   In order to ensure sufficient blood anticoagulation, heparin salt test tube blood collection must be reversed and mixed 5-8 times as soon as possible. Especially when the ambient temperature of blood sampling is higher than 25 ℃, the mixing of blood and heparin lithium must be timely and sufficient, otherwise it is easy to cause blood coagulation or local coagulation.   Heparin anticoagulation is not irreversible anticoagulant, so the test should be completed within 6 hours after blood collection of heparin lithium anticoagulant test tube, otherwise, the test results may have errors.   Heparin may be involved in the metabolism of cell enzymes and ions, so the amount of heparin used may affect the detection results. The dosage of heparin should ensure full and local anticoagulation, so as to ensure that most of the plasma indexes can be repeated within 6 hours, especially ast, alt, TBIL, DBIL, GGT and other sensitive indicators.   Heparin lithium can be used with separation gel at the same time, anticoagulant effect, tube wall silicification, centrifugal conditions, separation gel quality and so on will affect the blood separation effect. It is suggested that high quality plasma samples can be obtained by using the blood separation gel produced by our company. It is suggested to use gamma ray irradiation with a dose of 8-25kgy. The irradiation dose can be determined by the initial colony number.   [warning and prevention]   It is forbidden to use heparin lithium in case of impurities, abnormal smell, color and expiration date. Do not use the heparin solution when it is contaminated with lithium bacteria. This product is a biological preparation, safe, non-toxic and harmless.   Desheng is an old brand blood testing reagent company with 14 years of R & D and production experience, and has a deep research on blood collection additives. If you need heparin lithium enterprise friends can contact directly, looking forward to your consultation!

Affected by this year's epidemic, Carbomer has become a popular raw material for daily chemical products. Now there are countless manufacturers that provide Carbomer. It can be said that buyers are confused. What kind of Carbomer raw material company is more worthy of choice. Desun’s decades of professional R&D and production experience have accumulated a lot of experience for the company. Its advantages and marketing strategies have laid a solid foundation for itself in the industry. This type of company is worthy of long-term cooperation. In addition, it also needs to have The following three characteristics.     1. Have an exclusive R&D department to master advanced technology   By investigating related companies, we can find that high-quality carbomer manufacturers can master more advanced technologies, conduct in-depth explorations with customers, and negotiate cooperation-related matters. In early 2020, the company invested a lot of capital, manpower and material resources, and now has A group of professional technical backbone personnel, through their R&D personnel working overtime and testing and testing, finally completed the final product of Carbomer. The carbomer raw materials produced are up to standard in all indexes, comparable to international brands, and its transparency is better than that of well-known brands.   2. Short delivery cycle, saving purchase time   With the increasing demand for carbomer, carbomer was in short supply for a while. Fortunately, after the increase in manufacturers, this phenomenon gradually improved. However, there are still many customers who fail to supply ton goods in time. Sheng currently has a professional production base and adopts imported production equipment. The daily output of Carbomer can reach 3-5 tons, which can meet the needs of customers in large quantities. Customers do not have to worry about the delivery cycle.     3. Ability to uphold the principle of seeking truth from facts to solve customers' doubts   Good carbomer manufacturers can usually implement the principle of seeking truth from facts. Whether it is introducing customers to other products of the company or answering questions raised by customers, they will not divorce from reality. Because the company knows that products and rhetoric that are inconsistent with the facts will cause wrong guidance to customers. "Morality-oriented, honesty first" is the foundation for the company to stand firm for more than ten years. Similarly, when encountering quality When there is a problem, Desheng never shirks, but promptly returns and exchanges to ensure that the interests of customers are not harmed to the greatest extent.   Carbomer manufacturers that are worthy of cooperation generally have the three characteristics mentioned above. This part of the content can be used as a summary of the advantages of Desheng, and it can also be a reference for customers to consider during the purchase period. There are a large number of manufacturers of the same type on the market. We hope that customers in need can calmly complete the screening without missing any details. Desun now produces Carbomer 940 and Carbomer 980. Welcome to buy!

The English name of edta-3k is Tripotassium hydrogen ethylenediamineetraacetate. Its CAS number is 17572-97-3. Its molecular formula is c10h13k3n2o8, and its molecular weight is 406.51372. Its appearance is white crystalline powder. Structure of Tripotassium EDTA   Application of tri potassium ethylenediamine tetraacetic acid 1. As an anticoagulant for blood cell analysis. Ethylenediamine tetraacetic acid (EDTA) as an anticoagulant for blood cell analysis was determined by the International Committee on blood standards (ICSH) in 1993 and has been widely used. In China, the use of edta-k3 anticoagulant for blood analysis is not long, and there are few reports on EDTA dependent thrombocytopenia. Some people think that this phenomenon is an autoimmune disease, because a large proportion of such people have elevated serum immunoglobulin, and have positive anti platelet autoantibodies and anticardiolipin antibodies.   The plasma of such patients can cause platelet aggregation of healthy people when they are incubated with platelets of healthy people, but the plasma of healthy people can not cause platelet aggregation of such patients. When edta-k3 anticoagulant is used in patients with edta-k3 anticoagulant, a large number of PLT gather together, leading to false reduction of PLT count. At the same time, the volume of some PLT aggregates is equivalent to the volume of WBC, and can not be destroyed by hemolysin, which also makes the false increase of WBC count, which will make the classification of WBC appear various inaccurate prompts There must be platelet aggregation or platelet aggregation in the histogram.   Some studies have shown that when edta-k3 anticoagulant is used for blood analysis, it is found that the platelet count is too low for unknown reasons. Therefore, the patient should be manually checked for blood smear and PLT manual counting, or the PLT count should be rechecked by instrument after dilution with non anticoagulant peripheral blood, so as to correctly understand the real level of PLT in patients. In particular, tumor patients, autoimmune diseases, pulmonary heart disease, pregnant women, advanced liver disease and other patients.   2. Preparation of a self-cleaning high borosilicate glass rod. The preparation method comprises the following steps: 1) according to the weight parts, 34-44 parts of aluminum isopropoxide, 1-2 parts of ethylene diamine tetraacetic acid Tripotassium salt and 250-300 parts of deionized water are evenly mixed, the mixture is heated to 40-45 ℃, and the heat preservation treatment is conducted for 2-3 hours to prepare colloidal solution a;   2) According to the weight part, 29-33 parts of tetrabutyl titanate is dissolved in 150-170 parts of ethanol, and then 60-70 parts of ammonia water with mass fraction of 11-15% are slowly dropped into it. After standing for 2-3 hours, 5-9 parts of potassium titanium oxyphosphate are added into the mixture, and after mixing and stirring evenly, colloidal solution B is prepared;   3) Colloidal solution a and colloidal solution B are mixed according to the mass ratio of 3-6:1, and then colloidal solution B is added into the mixture The self-cleaning coating is prepared by mixing and stirring the polyethanolamine with the amount of 1-3%. After cleaning the surface of the high borosilicate glass rod, it is placed in the self-cleaning coating for 10-14 min. after that, it is taken out and put into the high-temperature furnace for sintering treatment to prepare the finished product. In step 1), the addition of potassium EDTA can effectively improve the adhesion performance of the prepared colloidal solution a, improve the dispersion uniformity of AlOOH colloid, and prevent the phenomenon of precipitation;   3. Prepare a kind of thermal insulation coating for building exterior wall. In terms of weight, it contains 80~120 pieces of pure acrylic emulsion, 20~30 parts of Ta2O5-ZnO-SnO2 composite oxide powder, 5~10 parts of three potassium of ethylenediamine acetic acid, 2~5 parts of kaolin, 1~5 parts of borax, 2~5 parts of antifreeze, 5~10 parts of film forming aid, 1.5 1.5 2.3 parts of pyrophosphate, 1~2 1~2 of thickening agent, polyoxyethylene polyoxypropylene pentaerythritol ether and 5~10 nitrobenzene sulfonic acid. To 150.   Through the test, it is found that the introduction of EDTA into the exterior wall coating can significantly improve the acid corrosion resistance of the coating, so that in cities with severe acid rain, the coating can also ensure good service life and is not easy to corrosion and fall off.   Hubei xindesheng material science and Technology Co., Ltd. is specialized in the production and supply of ethylenediamine tetraacetic acid potassium national package, interested parties can contact

In fact, the sensitivity of luminol reagent itself is very high, even if the blood has been scrubbed, or even old blood stains, it can make luminol reagent glow. However, due to the principle that luminol is oxidized and glows, it is more likely to be affected by other non blood substances, such as bleach. In addition, trace blood in the excreta will also be detected by it, which will cause interference.   Some criminal investigation enthusiasts have found that the detection of blood with luminol reagent can be interfered with basically, such as scattering animal blood or liver, feces, iron ion reagent, etc., but it can't escape completely. Even if it can disappear in a short time, it will be exposed in a long time. And even if lucky enough to escape luminol, there are other ways and DNA extraction. Therefore, like the queen, to escape the police search by cleaning the floor, we can not deny the sensitivity of luminol reagent, but only minimize the emergence of evidence.   Because luminol luminescence is caused by oxidation, this means that there are many oxides and catalytic metals that can also make luminol glow, including the daily use of hypochlorite bleach.   If the suspect takes some measures after committing a crime, for example, if he uses chloric acid bleach to clean the scene, then if he is injected with luminol at the scene of the chlorite washed, you will find that it will shine everywhere, which will interfere with the detection of blood. You can't help but sigh that the reagent is wrong.   Luminol is not as bad as you think. Forensic criminal investigation using it to solve a case must have thought of this earlier than you. You should know that although luminol and hypochlorous acid can make luminol glow, the two kinds of luminous phenomena are not the same. The luminescence caused by bleaching agent is fast flashing, while that caused by blood stains is gradually emerging. Experienced detectives or police officers can usually tell the difference between the two, so it's impossible to beat them with such a small trick.   Luminol, a chemiluminescent reagent developed by Desheng, has many advantages, such as high quantum yield, easy synthesis, good water solubility and so on. If you are also a criminal investigation enthusiast, you can contact our website customer service for consultation and purchase if you want to guide and perform a chemiluminescence experiment.

Among the pathogens (virus, bacteria, fungi, parasites, etc.) that cause the epidemic of human infectious diseases, virus is the most common one. Its most important feature is noncellular structure. The viral body is mainly composed of nucleic acid and protein. It contains only one nucleic acid. There is no enzyme system that can produce energy. It can only replicate in living cells. The virus is small and can be used for The unit of measurement is nanometer (nm), the maximum diameter is 300 nm (such as poxvirus), and the minimum diameter is 20 nm (such as foot-and-mouth disease virus). This characteristic of the virus makes it unable to survive without cells, and to study these viruses, we need to rely on the virus preservation solution to prolong the survival time of the virus.     At present, the virus preservation solution can be divided into inactivated type and non inactivated type The left is non inactivated preservation solution, and the right is inactivated preservation solution   1. Inactivated novel coronavirus: it is a colorless transparent liquid, and is suitable for various kinds of viruses, including new coronavirus, influenza virus, hand foot mouth virus, rubella virus and so on. It uses high concentration guanidine salt to quickly inactivate and preserve the virus, so as to make the sample lose infectivity. The novel coronavirus RNA Extraction Kit novel coronavirus, M32/M96 nucleic acid extraction kit, and the new coronavirus PCR kit were successfully applied to detect the inactivated samples. The specificity of the assay was not affected. Applicable kit methods: fluorescent PCR, combined probe anchoring polymerization sequencing, isothermal amplification chip method, magnetic particle chemiluminescence method, colloidal gold method.   2. Non inactivated virus preservation solution: Hanks solution base, gentamicin, fungal antibiotic, BSA (V), and the other two were used as the main components, Cryoprotectants, biological buffers and amino acids, combined with a variety of antibiotics, have antibacterial and antifungal effects; bovine serum albumin (BSA), as a protein stabilizer, can form a protective membrane on the protein shell of the virus, making it not easy to decompose and ensure the integrity of the virus; the neutral environment constructed by Hanks buffer helps to increase the survival time of the virus and Infection stability.  

Since the spread of the new crown virus, the importance of hand disinfection has been greatly improved compared with that before. Carbomer, as an important component of the hand sanitizer gel, is naturally favored by the market. Now there are more and more manufacturers of carbomer in China. Large families are aiming at this bonus market and are prepared to make a big effort to make up for all kinds of enterprises during the epidemic. The loss situation, with so many kapham manufacturers rushing to come, buyers are puzzled. How can we find reliable manufacturers?     Here we need to tell you the purchase of Desheng carbomer products need to pay attention to a few points, you can refer to, avoid detours.   1. Understand the different models of carbomer   There are many types of Carbomer, such as carbomer 980, Carbomer 940, Carbomer 934, Carbomer 941 and so on. Some of the differences between models are big and some are small. Therefore, we need to judge what we need according to our own needs. Different Desheng carbomer models have different uses, which are mainly divided into the following aspects: daily chemicals, food, pharmaceutical accessories, etc. It will save a lot of time if the buyer has a clear awareness of the needs and knows what products Desheng capom is used for.     2. Know the manufacturer of carbomer   First of all, ask at least three suppliers for prices and compare them. In a word: a 5% reduction in purchasing cost is equivalent to a 20% increase in profit. Then, it is also important to pay attention to the reliability of the supplier's product quality while looking at the price!   Next is the delivery date. See if the supplier's delivery date is within your acceptance range. If you can get the supplier to give you a certain safety stock, that would be better!   Finally, service, whether the communication with suppliers is smooth. What kind of service the supplier promises to provide. If you only sell products without services, I believe you will not buy them again. You need to conduct a comprehensive evaluation and analysis of suppliers, including their strengths, weaknesses, problems, threats, etc. Thus, the company's strategy is organically combined with the internal resources and external environment of the company.   ①. The accuracy of the product content and various parameters is guaranteed, and the parameter table is provided, which can be compared and verified by customers. ②. Ensure the continuous spot supply within the customer's demand, which will not affect the normal use of customers. ③. If there are no special circumstances, the freight of all products will be borne by our company. ④. Except for special models, all products of the company have intellectual property certificate, so customers can use them at ease.