Toocle find for you 333 information about the as-ajs.com.cn, total 17 pages
CFJD25 Electronic Air Velocity Measuring Instrument for Coal Mines: Use as Needed, Direct Reading Available.
$350
Category: Chemicals/Chemical Intermediates/Intermediate Compounds
Company: Yantai Lesen Machinery Equipment Co., Ltd
Product Description: 因原材料波动、因此价格型号也有不同,具体报价请联系销售人员,谢谢。不该做的坚决不做,我做错的我负责。CFJD5矿用电子式风速表用途:风速表,分为CFJD5型电子式风速表(低速)和CFJD25电子式风速表(中高速)两种类型,主要用途主要用于煤矿井下平均风速的测量。也适用于建筑、化工、纺织、粮食、储藏、空气动力研究等其它场合的风速测量。   电子风速表一般指电子式风速表。 电子式风速表,定义测量平均风速的仪表,特点体积小、重量轻、使用方便,量范围0.3—5m/s。机械式风速表工作原理:按全牌机械式风速表表头上部的两支杠杆,高级为圆帽形的圆柱杠杆是回零闸压杆,将它轻轻压下能使长短指针立即恢复零位。另一支为离合闸,将它左右推动能使计数器与翼轴连接或分开。机械式风速表主要技术参数:1、风速测量范围:0.5~10米/秒2、起动风速:≤0.4米/秒3、风表误差符合表中规定:风速范围(米/秒)  风表非线性误差值(米/秒)0.4~5.0                  ≤0.105.0~10.0                 ≤0.154、外形尺寸:90*39*78(mm)机械式风速表型号:DFA-2型。机械式风速表组成:机械式风速表主要由翼轮、涡轮、涡轮轴、计数器、指示针、回零闸压杆、离合闸、护壳、提环、底座等构成。=DFA-3型低速风表、DFA-4型高速风表  煤矿用电子式风速表 矿用电子风速表 机械电子风速表,矿用机械风速表,DFA2中速风表、DFA3微(低)速风表,手持风速仪 more>
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Buried scraper chain conveyor can be configured for reverse operation and customized as needed.
$8080
Category: Machinery & Equipment/Engineering & Construction Machinery/Other Engineering & Construction Machinery
Company: Hebei Naixin Environmental Protection Technology Co., Ltd.
Product Description: The composition of the buried scraper chain conveyor can be reversed and customized as needed. Daily Maintenance Management:During the use of the screw conveyor, it is essential to pay attention to daily maintenance to ensure optimal cooperation with the sand dryer, guaranteeing production capacity and efficiency, as well as extending the equipment's service life.(1)Lubricating oil should be regularly applied to transmission parts such as bearings, gears, and chains.(2)After the conveyor is shut down, inspect the wear of the spiral blades and perform welding repairs if the wear is severe.(3)Do not overload the conveying capacity, as it may prevent material discharge, causing bending of the screw shaft and damage to the casing.(4)When conveying materials at high temperatures, ensure that the casing expands and contracts freely without any obstructions; address any issues promptly.(5)If the conveyor emits harsh noise during operation, open the cover for inspection and troubleshoot the issue.When material is fed into the fixed chute, due to the gravity of the material and the friction between the material and the chute, the material accumulated at the bottom of the chute does not rotate with the screw. Instead, it is pushed forward by the rotating spiral blades, similar to a non-rotating nut moving along a rotating screw, achieving the purpose of conveying material. This machine facilitates multi-point loading and unloading and can simultaneously perform mixing, stirring, or cooling functions during the conveying process. It is sensitive to overload and prone to clogging; it may cause crushing and wear to the material. The horizontal screw conveyor has a simple structure, making it easy to install, maintain, and troubleshoot. It is suitable for horizontal or slightly inclined (below 20º) continuous and uniform conveying of loose materials, with an operating environment temperature of -20 to +40°C and a material temperature range of -20 to +80°C. Its rotational speed is relatively lower compared to vertical conveyors, primarily used for horizontal or small-angle material conveying, with a conveying distance generally not exceeding 70 meters. The composition of the buried scraper chain conveyor can be reversed and customized as needed. more>
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Choline chloride plant micronutrient as raw material for foliar micronutrient fertilizer
$50
Category: Chemicals/Pharmaceutical Raw Materials/Amino Acids & Derivatives
Company: 郑州超凡化工有限公司
Product Description: Model: Food Grade, Industrial Grade, Feed GradePackaging: 25 kg cardboard drum (lined with polyethylene bag)Content: 99.9%Origin: Domestic/ImportedCAS: 67-48-1Properties: White crystalUsage: Nutritional additiveKeywords: Choline chloride manufacturer, choline chloride price, choline chloride function, choline chloride dosage, choline chloride CAS, choline chloride detailed description, choline chloride usage method, choline chloride content, food-grade choline chloride, choline chloride addition amount【Product Name】Choline chloride【English Name】Choline chloride【Molecular Formula】C5H14ClNO【Molecular Weight】139.65【Product Aliases】2-Hydroxyethyltrimethylammonium chloride; Egg-boosting agent; Chloride of (2-hydroxyethyl)trimethylammonium【Product Properties】Choline chloride is a white crystal.【Choline Chloride Product Application Range: Formulated milk powder, jelly, etc.】Usage amount (calculated as choline ≤ mg/kg): Formulated milk powder (for children) ≤800mg/kg-1500mg/kg.Formulated milk powder (for pregnant women) ≤1600mg/kg-3400mg/kg; Jelly ≤50mg/kg-100mg/kg.Choline chloride usage method: Dissolve in water as per production requirements, or mix with some materials before use.Choline chloride is also a plant photosynthesis promoter. When used as a foliar fertilizer, it can significantly increase the content of chlorophyll, soluble protein, and plant carbohydrates in crop leaves, enhance the activity of superoxide dismutase, improve leaf photosynthetic efficiency, and produce more nutrients transported to roots and tubers. Its yield-increasing effect is to initiate early germination of root primordia, promote early expansion of roots and tubers, increase the proportion of large and medium-sized roots and tubers, thereby increasing yield. It is suitable for root and tuber crops and has a significant effect on increasing yield. Spraying during the booting stage of wheat and rice can promote spikelet differentiation and increase grain number per spike; spraying during the grain-filling stage can accelerate the grain-filling rate, resulting in plump grains and an increase of 2–5 grams in 1000-grain weight. It can also be used for corn, sugarcane, sweet potatoes, potatoes, radishes, onions, cotton, tobacco, vegetables, grapes, mangoes, etc., to increase yield, with stable effects under different climatic and ecological conditions; for root and tuber crops such as tubers, use 6–12 grams per mu diluted with 60 jin of water (1500–3000 times) (i.e., add 100–200 grams of choline chloride to 1000 jin of water) and spray 2–3 times during the early expansion stage for obvious expansion and yield-increasing effects; for ornamental plants like azaleas, poinsettias, geraniums, hibiscus, etc., to regulate growth; for wheat, barley, and oats to prevent lodging. It has good effects on increasing yield and promoting growth in vegetables, fruit trees, and tea trees. Choline chloride can also help corn seedlings survive under long-term mild drought conditions.For sweet potatoes, apply foliar spray at the beginning of tuber formation or expansion; for potatoes, apply foliar spray at the initial flowering stage; for garlic, apply foliar spray at the beginning of bulb expansion; for peanuts, apply foliar spray at the initial flowering and needle-setting stage; for yam, apply foliar spray when the tubers begin to expand and the vines are about 1 meter long; for radishes, apply foliar spray at the 7–9 leaf stage; for onions, apply at the beginning of bulb expansion; for ginger, apply foliar spray at the three-branch (3-seedling) stage. For Chinese medicinal herbs, apply foliar spray during the root and tuber expansion period. Use 6–12 grams of choline chloride per mu, diluted with 30 kg of water, and spray evenly after dew has dried. Repeat every 10–15 days, for 2–3 consecutive applications.【Choline Chloride in Aquaculture】In aquaculture, it is mainly used for breeding fish and shrimp. It has significant effects on promoting the growth of carp and reducing fatty liver in grass carp, and it also has an obvious appetite-stimulating effect, thereby shortening feeding time and improving feed conversion rate.【Product Usage and Method】Choline chloride is a nutritional supplement and lipotropic agent. It promotes fat metabolism and prevents fat accumulation in the liver. It belongs to the B-vitamin category and is used in pharmaceuticals and food nutrition additives. The pure product is colorless or white crystalline granules, highly hygroscopic.Packaging: 20 kg cardboard drum (lined with polyethylene bag), 1 kg aluminum foil bag, or customized packaging according to customer requirements.【Solubility】Choline chloride is easily soluble in water, slightly fishy-smelling, with a salty-bitter taste, and is highly deliquescent. It is unstable in alkaline solutions.【Product Storage】Choline chloride white crystalline powder is particularly hygroscopic. The shelf life is 2 years. Store sealed in a dry warehouse to prevent moisture absorption. If the choline chloride powder absorbs moisture, it may become wet and clump, but this does not affect its efficacy. more>
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Benzenepropanoic acid,a-hydroxy-b-methoxy-b-phenyl-,(aS)-
Negotiable
Category: Chemicals/Chemical Intermediates/Intermediate Compounds
Company: 杭州灿瑞医药化工有限公司
Product Description: CAS NO:178306-52-0EC NO:Molecular Formula:Molecular Weight:Synonyms:;(S)-2-Hydroxy-3-methoxy-3,3-diphenylpropionic acid;(S)-2-Hydroxyl -3-methoxy-3,3-diphenylpropanoic acid;(S)-2-Hydroxy-3-Methoxy-3,3-Diphenylpropanoic Acid;Ambrisentan Intermediate-2;Molecular Structure: more>
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Benzenepropanoic acid,a-hydroxy-b-methoxy-b-phenyl-,(aS)-
Negotiable
Category: Chemicals/Chemical Intermediates/Intermediate Compounds
Company: 杭州共泽医药科技有限公司
Product Description: CAS NO:178306-52-0EC NO:Molecular Formula:Molecular Weight:Synonyms:;(S)-2-Hydroxy-3-methoxy-3,3-diphenylpropionic acid;(S)-2-Hydroxyl -3-methoxy-3,3-diphenylpropanoic acid;(S)-2-Hydroxy-3-Methoxy-3,3-Diphenylpropanoic Acid;Ambrisentan Intermediate-2;Molecular Structure: more>
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Benzenepropanoic acid,a-hydroxy-b-methoxy-b-phenyl-,(aS)-
Negotiable
Category: Chemicals/Chemical Intermediates/Intermediate Compounds
Company: 安庆百谊生物科技有限公司
Product Description: CAS NO:178306-52-0EC NO:Molecular Formula:Molecular Weight:Synonyms:;(S)-2-Hydroxy-3-methoxy-3,3-diphenylpropionic acid;(S)-2-Hydroxyl -3-methoxy-3,3-diphenylpropanoic acid;(S)-2-Hydroxy-3-Methoxy-3,3-Diphenylpropanoic Acid;Ambrisentan Intermediate-2;Molecular Structure: more>
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Three-way temperature control valve is suitable for equipment such as petrochemical air compressors and refrigerators.
$2800
Category: Machinery & Equipment/Valves/Instrument Valves
Company: Changzhou Yingkai Valve Industry Co., Ltd.
Product Description: Changzhou Yinkai Valve Co., Ltd. is a company specializing in the research, development, and production of self-operated temperature control valves. To date, the company has obtained ISO9001:2015 quality management system certification, the Russian Customs Union EAC certification, ATEX explosion-proof certification, CE certification, and PED pressure vessel certification. The R&D system and design philosophy of YINKAIR temperature control valves originate from British shareholders. Since its establishment, the company has consistently adhered to importing core components, upholding a professional and focused business philosophy, and striving to provide customers with high-performance and cost-effective temperature control products.Yinkai Valve's self-operated three-way temperature control valves are suitable for equipment such as petrochemical air compressors and refrigeration units.The YINKAIR series of temperature control valves are not only compatible in installation dimensions with AMOT temperature control valves, HB Hoerbiger temperature control valves, German BEHR temperature control valves, Vmc temperature control valves, and others, but also offer superior performance. Our products are widely used in various fields, including diesel engines, compressors, hydraulic lubrication equipment, new energy vehicles, wind power equipment, boilers, air conditioning and refrigeration equipment, marine and offshore industries, and oil and gas.Currently, the YINKAIR series of temperature control valves have been successfully matched with international compressors such as GD Gardner Denver, Sullair, Ingersoll Rand Group, Atlas Copco, Quincy, Fusheng, and other top-tier international compressors, as well as GE Transportation, Kaishan Group, Yanmar engines, York air conditioning and refrigeration units, and more. For specific parameters, please contact Yinkai Valve for confirmation.Generally, the housing materials for the YINKAIR series/Yinkai series temperature control valves include cast iron, ductile iron, aluminum, copper, steel, and stainless steel. Optional configurations for the YINKAIR series/Yinkai series temperature control valves include nickel-plated valve cores, fluororubber or neoprene sealing materials. We can also customize configurations based on user requirements.Yinkai Valve's self-operated three-way temperature control valves are suitable for equipment such as petrochemical air compressors and refrigeration units.The temperature control valve operates on the principle of wax thermal expansion, where semi-liquid wax exhibits high expansion rates within a small temperature range. The self-operated temperature control valve core moves within the bushing based on the heating state, thereby achieving flow regulation. All ENKAIR series/YINKAIR series temperature control valves have pre-set control temperatures, so no adjustment is required after leaving the factory. This product has a wide applicable temperature range and is extensively used in cooling and lubrication systems. When the temperature control valve is used for diversion, all fluid bypasses the cooler at startup. The three-way temperature control valve returns fluid to the system through the bypass port (B), while the outlet of the two-way temperature control valve is blocked by the bushing. When the fluid temperature rises to the controllable range, a portion of the fluid enters the cooling system through the outlet (C) of the three-way temperature control valve, while the two-way temperature control valve directly discharges this portion of fluid. Thus, as the medium temperature continues to rise, more fluid will pass through the cooler or be discharged. When the temperature control valve is fully open, all fluid will pass through the cooler or be discharged, achieving temperature regulation.When the temperature control valve is used for mixing, high-temperature fluid enters the valve through port B, while low-temperature fluid enters through port C. The two fluids of different temperatures are adjusted to the set temperature within the valve and then enter the application system through port A. more>
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Strong efficacy HEP Powder for lab research with factory price
$1
Category: Chemicals/Inorganic Salts/Other Inorganic Salts
Company: Strong efficacy 5cl-adb-as for lab research for sample 86 16517626558
Product Description: We are a professional manufacturer of intermediates and chemicals for many years, our products have exported to Germany,Spain,UK,USA,Australia,Middle East,and so on other countries,and we have got very good feedback from our customers.   Product name: HEPs Appearance: Powder/crystal  Color :White MOQ:10g Purity: 99.8% Inspection:For lab or chemical research Payment :bitcoin,western union,moneygram Packing:Aluminum foil bag or according to your requirement Delivery: Within 2 days after payment   Contact us: Wickrme: Ninavv Whatsup:86 16517626558; E : ninavv_1[a]outlook[dot]com; more>
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Lab use 5f-mdmb-2201 drug/for sample wickr: ninavv
$1
Category: Chemicals/Chemical Intermediates/Intermediate Compounds
Company: Strong efficacy 5cl-adb-as for lab research for sample 86 16517626558
Product Description: We are a professional manufacturer of intermediates and chemicals for many years, our products have exported to Germany,Spain,UK,USA,Australia,Middle East,and so on other countries,and we have got very good feedback from our customers.   Company advantage: 1. Good quality and high purity products, won us lots of customers; 2. Competitive prices - enough orders to put down the cost; 3. Fast delivery - by safe express way; 4. highly qualified engineers and experts guidance; 5. customize synthesis products are available; 6. Safe package,and we can custom the package as you require; 7. Sample order available;   Hot sale products: 5F-MDMB-2201s ETIZOLAMS 4FADBS Eutylones 5CL-ADB-AS U-48800S MDPEPs MFPEPs HEPs Eutylones bk-edbps MDMAs Ethylones   Wickrme: Ninavv E--mail: ninavv_1[a]outlook[dot]com; Whatsup:86 16517626558; more>
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Modified polysiloxane leveling agent as a substitute for Tego 450
$面议
Category: Chemicals/Quaternary Ammonium Salts/Alkyl Quaternary Ammonium Salts
Company: 广东方舟化学工业有限公司
Product Description: Product Name: Coating Additive – Leveling Agent  AC-8450Composition: Modified Polysiloxane Leveling AgentAppearance: Light yellow to colorless transparent liquidSolid Content: ≥97Product Characteristics:(1) Suitable for various water-based, solvent-based, and UV coatings.(2) Reduces surface tension of the coating film, improves substrate wettability, effectively eliminates various coating defects, and enhances leveling.(3) Good compatibility, minimal impact on interlayer adhesion, recoatable, improves surface feel, and enhances scratch resistance.Application:(1) Total formulation amount for solvent-based coatings: 0.05~0.3%(2) Total formulation amount for water-based and UV coatings: 0.1~1.0%.AC-8450 can be added at any stage of the production process.Storage: Store in a cool, dry place.Packaging Provided: Packed in drums with net weights of 200 kg, 25 kg, and 5 kg. more>
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N-2-Aminoethyl-3-aminopropyltrimethoxysilane as a substitute for KH792
$面议
Category: Chemicals/Chemical Intermediates/Intermediate Compounds
Company: 广东方舟化学工业有限公司
Product Description: Product Name: N-2-Aminoethylaminopropyltrimethoxysilane    AC-63Appearance: Liquid;      Solid Content: >98%(1) Used as a coupling agent for mineral-filled reinforced nylon 6, nylon 66, and PBT resins.(2) Used as a glass fiber treatment agent and resin additive.(3) Used as an additive for thermosetting resins in the manufacture of castings and wear-resistant parts to enhance the properties of these resins.(4) Used as a binder for glass, mineral wood insulation materials, wear-resistant parts, and molded products. more>
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Electric fusion alumina 36# for sandblasting of tank anti-corrosion pipelines, also known as WA abrasive F36.
$3600
Category: Hardware & Tools/Abrasive Materials/Other Abrasive Materials
Company: Zhengzhou Haixu Abrasives Co., Ltd.
Product Description: Fused Alumina 36# (WA Abrasive F36) for Tank Anticorrosion Pipeline SandblastingWhite Fused Alumina F36 Technical Parameter TablePRODUCT/Product: White Fused Alumina F36CHEMICAL COMPOSITION/Chemical Composition:ItemGuarantee Value(%)Typical Value(%)Al2O3≥99.299.62Fe2O3≤0.10.03SiO2≤0.10.02Na2O≤0.40.26MgO≤0.020.01CaO≤0.050.02K2O≤0.030.01PHYSICAL PROPERTIES/Physical Properties:Specific WeightHardnessBulk DensityMelting Point3.95 g/ cm39.0Mohs scale1.73-1.82g/cm32050℃PARTICLE SIZE DISTRIBUTION/Particle Size Distribution:GritMesh#Mesh size(um)Weight Standard(%)Typical Value(%)Coarse Grit+2085000Coarse Grit+30600≥258.5Basic Grit+35500≤4554.2Mixed Grit+35+40500 425≤ 6587.3Fine Grit-45355≥30.5APPLICATIONS/Applications:Resin Bonded Abrasives and Vitrified Bonded AbrasivesAlumina CeramicsRefractory & CastingBlasting and grindingPackage/Packaging:25kg woven bag + ton bag25kg woven bag + 1-ton palletCustomized packaging such as paper bags is available more>
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Explosion-proof magnetic starters serve functions such as safe startup and prevention of remote control.
$900
Category: Electrical Equipment & Supplies/Switches/Reversing Switches
Company: Nanyang Shouan Explosion-proof Electric Co., Ltd.
Product Description: Safe Start: The explosion-proof magnetic starter utilizes magnetic drive technology, enabling easy device activation without contact, effectively avoiding safety hazards. Suitable for various types of high-power equipment, such as electric motors, generators, air conditioners, etc. Prevention: The explosion-proof magnetic starter employs special sealing and isolation techniques to prevent external gases from entering the internal circuit, thereby avoiding risks caused by electric sparks. Remote Control: The explosion-proof magnetic starter features remote control functionality, allowing for remote start or stop of equipment without the need for on-site operation, greatly improving work efficiency and safety. Overload Protection: The explosion-proof magnetic starter also includes multiple protection functions such as overload protection and short-circuit protection, effectively preventing fires caused by electrical faults. The explosion-proof magnetic starter is primarily used in hazardous locations containing gas mixtures of Class II, Group B or C, T4 group and below, to control the start, stop, or reversal of three-phase asynchronous motors, and provides overload and short-circuit protection.The magnetic starter housing is made of ZL102 aluminum alloy die-casting or steel plate welding, with high-voltage electrostatic spraying on the surface, and is equipped with stainless steel exposed fasteners, giving the product an aesthetically pleasing appearance. It adopts a composite, modular structure, with each circuit freely assemblable as needed. Generally, the switch box uses a flameproof structure, while the busbar box and outlet box use an increased safety structure. It contains AC contactors, thermal relays, control buttons or switches, and can be operated on the box or remotely, as well as from two locations, featuring breaking, overload, undervoltage protection, and automatic short-circuit cutoff functions. Customization is available according to customer requirements, such as adding surge protectors, ammeters, voltmeters, etc., and can be equipped with an external padlock metal handle. Suitable for controlling multiple motors, each branch can be equipped with circuit breaker protection, and can also provide power for lighting or instruments.Both conduit and cable wiring are acceptable. Complies with GB3836-2000 and IEC60079 standards. BXQ-25A explosion-proof magnetic starter aluminum alloy explosion-proof reversible magnetic starter manufacturer technical requirements: 1. Explosion-proof marking: ExdeⅡBT4, ExdeⅡCT4  2. Protection level: IP55, IP65  3. Corrosion resistance level: WF1  4. Installation form: Wall-mounted  5. Rated voltage: AC380V/220V  6. Rated current: 10A-125A7. Power: Maximum power 10KW, reversible maximum power 18.5KW  8. Current range: 0.25-40A  9. Inlet thread: G1”, G11/2”  10. Cable outer diameter: Φ12mm~Φ17mm, Φ18mm~Φ26mm Mainly used for controlling the start, stop, or forward/reverse (reversible) operation of three-phase asynchronous motors, and provides protection functions such as undervoltage, overload, and phase loss. Can be set for two-location control or multi-location control. Motor power: 4kw, 5.5kw, 7.5kw, 11kw, 15kw, 18.5kw, 22kw, 30kw, etc. For example, model: BQC-10A/380V (controls 4kw motor, voltage 380V). When ordering, specify the power, voltage, etc. more>
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3-Mercapto-2-butanone (also known as 3-Mercaptobutan-2-one)
Negotiable
Category: Chemicals/Chemical Intermediates/Intermediate Compounds
Company: 滕州市润隆香料有限公司
Product Description: Product No.:RL7029Product Category:Sulfur-containing SeriesProduct Name:3-Mercapto-2-butanone (also known as 3-Mercapto-butan-2-one)Content:≥99%Aroma Characteristics:Meaty, chestnut-like aromaStructural Formula:Application:Dairy products, meat products, seasonings, etc.FEMA:3298CAS:40789-98-8Recommended Dosage (ppm):0.1-2Order: more>
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Automotive components processed using quenching oil as the cooling medium
Negotiable
Category: Chemicals/Petrochemicals/Diesel
Company: 西安国盛激光科技有限公司
Product Description: Quenching oil is commonly used for the following components and materials:1. Molds: The production of transmission parts such as crankshafts, connecting rods, and steering knuckles requires the use of molds. These molds are large in size and difficult to harden thoroughly. If the cooling rate is too fast, the workpiece is prone to cracking. Therefore, it is recommended to use fast or ultra-fast quenching oil.2. Gears: These products typically undergo carburizing heat treatment to improve wear resistance and fatigue resistance. For small and medium-sized gears, deformation and high precision requirements must also be considered, so quenching oil is often used as the cooling medium.3. Leaf Springs: These components have significant variations in thickness, making them prone to cracking and difficult to harden. Therefore, fast quenching oil is required.4. Standard Parts: These products are manufactured and produced according to specific standards, typically with uniform specifications and quality requirements.These products are made from a variety of materials, and most small parts are produced using multi-purpose continuous furnaces, with quenching oil used for cooling. Additionally, small parts made from materials such as bearing steel, high-speed steel, and stainless steel are also produced in multi-purpose furnaces and use multi-purpose furnace quenching oil as the cooling medium.The general operating temperature for quenching oil is 60–80°C, equipped with cooling and stirring devices to prevent the oil from aging easily. During the use of quenching oil, it is essential to strictly adhere to heat treatment process requirements to avoid external contamination. At the same time, the condition of the oil must be monitored, and adjustments should be made promptly. This is a critical measure to ensure the effective use of quenching oil. more>
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Key points for using EDTA-K2 as an anticoagulant for blood collection
Negotiable
Category: Chemicals/Chelating Agents/Hydroxy Acid Chelating Agents
Company: Hubei new DE sheng material science and technology co., LTD.
Product Description: EDTA-K2 refers to potassium ethylenediaminetetraacetate, which is an EDTA salt commonly used as an anticoagulant in vacuum blood collection. Due to its wide range of applications, its usage methods vary when not in use. Here are the key points for its use as an anticoagulant. EDTA-K2 blood anticoagulation principle: EDTA dipotassium has a molecular weight of 404.6 and a pH of 3.8-5.8. It is usually prepared by reacting EDTA with potassium hydroxide, and then crystallized, dehydrated, and dried by controlling the pH to obtain the finished powder. When it is mixed into a solution, it will dissociate EDTA anions and EDTA acids, which can quickly chelate calcium ions in the blood, thereby preventing blood coagulation and inhibiting platelet aggregation. The difference between EDTA-K2 and other anticoagulants: EDTA dipotassium is commonly used as an anticoagulant for blood cell counting, with a lower melting point and slower anticoagulation speed than EDTA tripotassium; But its solubility is higher than that of EDTA disodium, so EDTA disodium is used less; Sodium citrate is generally used as an anticoagulant in coagulation tests (3.2%, 1:9) and blood sedimentation tubes (3.8%, 1:4). Key points for preparing EDTA-K2 anticoagulant solution: According to the requirements of Appendix NC of YY0314-2007 standard, the content of EDTA-K2 and EDTA-K3 in each mL of blood is 1.5-2.2mg. When preparing the reagent, we took the intermediate value of 1.8mg/mL. Follow the following steps when configuring: 1. Firstly, determine the amount of blood collected and the amount of anticoagulant added inside the blood collection vessel. Typically, a blood collection volume of 2mL is required, and the amount of anticoagulant added is 20uL. Therefore, the prepared EDTA potassium concentration is 1.8 * 2/0.02=180mg/mL, which is 180g/L. 2. Weigh the amount of EDTA dipotassium based on the volume of the prepared solution. For example, if 500mL is prepared, it is 90g, and if 2L is prepared, it is 360g. According to the addition amount of 20uL per tube, 2L of potassium dioxide solution can be applied to 100000 anticoagulant tubes. 3. The prepared solution should be stored at a low temperature of 0-4 ℃ for no more than 7 days, so it is best to prepare and use it immediately. It should be noted that if the blood collection volume inside the anticoagulant tube is 3mL or 5mL, the concentration of EDTA dipotassium solution can also be adjusted to 180g/L without increasing its concentration. However, limited consideration should be given to increasing the amount of EDTA-K2 added in each tube to 30uL or 50uL, as the solubility of EDTA-K2 is limited, and excessive concentration may cause local osmotic pressure to increase, leading to local blood cell rupture and hemolysis. When using EDTA potassium anticoagulant tubes for blood collection, it is also important to note that anticoagulation with EDTA salts is not irreversible, and testing should be completed within 24 hours after blood collection. The storage time of EDTA salt anticoagulant specimens is: the white blood cell count can be stored for 48 hours at 4 ℃, and not more than 24 hours at 23 ℃. Platelet count can be stored at 4 ℃ for 24 hours. EDTA salts can inhibit platelet aggregation, but they cannot completely prevent platelet aggregation. Sodium citrate anticoagulants can be used for platelet testing validation. Each kilogram of EDTA-K2 can meet the use of nearly 300000 anticoagulant tubes, with a cost of only a few hundred yuan, but it can affect the detection of hundreds of thousands of samples. Therefore, it is recommended to choose an old brand blood collection reagent manufacturer like Desheng, and use it together with its separation gel to ensure high-quality blood collection tubes and high-quality blood samples. more>
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Introduction to the characteristics and advantages of MAOS as a chromogenic substrate
Negotiable
Category: Others
Company: Hubei new DE sheng material science and technology co., LTD.
Product Description: MAOS (CASNo.: 82692-97-5), also known as N-ethyl-N - (2-hydroxy-3-sulfopropyl) -3,5-dimethylaniline sodium salt monohydrate, is a very important member of the new Trinder's reagent family. It's not as commonly used as TOOS, but But it also has an absolutely irreplaceable role. Like other new color reagents, they have high water solubility and much higher sensitivity than traditional color reagents commonly used in some laboratories, making them widely used in clinical testing and biochemical reagent kits. MAOS has a high absorption wavelength The biggest characteristic of MAOS is that the maximum absorption wavelength of its oxidized product far exceeds that of ordinary color reagents. Even in the new Trinder's reagent, its product has a relatively high UV absorption wavelength of 630nm. The maximum absorption wavelength of many color reagent products is in the visible light region. If it is used to detect human blood or other body fluids, due to the complexity of the components in the sample to be tested, the sample itself contains a small amount of components with absorption wavelengths in the visible light region or similar to the absorption wavelength of the color product, which will result in higher detection results. If using MAOS, the maximum absorption wavelength of the product is in the ultraviolet region and relatively high, it will greatly reduce interference. Therefore, for some biochemical testing items that require highly accurate values, it is recommended to use MAOS as the chromogenic substrate. PH value of MAOS Secondly, the color reaction of MAOS chromogenic substrate has a wide adaptability range to the pH of the reaction system, greatly improving its adaptability Sex. Some color reagents often react under slightly acidic conditions, but enzyme involvement is usually required in biochemical testing. We know that enzyme catalysis is sensitive to the pH of the reaction environment, and it may even become inactive if it does not match the color reagents. Its use is greatly limited, while MAOS reagents do not have this problem. Molar absorbance of MAOS Another point is that the molar absorption intensity of MAOS color reaction is relatively high, so its sensitivity is also relatively high. Attention Required However, when the detection time is too long, MAOS may fade, so MAOS detection needs to be completed in a timely manner and cannot be interrupted. In addition, MAOS is also relatively safe, unlike DAB and other biphenyl chromogenic reagents, which are relatively inexpensive but have Has certain carcinogenicity or mutagenicity. Storage of MAOS MAOS is sensitive to light and humidity, so it has high storage requirements. It is necessary to use containers that are well shaded and sealed, with a temperature of 0-5 ℃. It is best to store them in cold storage, while also paying attention to avoiding light and moisture to ensure higher and more accurate testing quality. Desheng Technology has always been committed to the research and development, production, and sales of chromogenic substrates, especially TOOS, MAOS, ADPS, etc., which have a good reputation both domestically and internationally. We have good cooperative relationships with many biochemical reagent kit manufacturers. Let's work together to add bricks and tiles to the field of domestic diagnostic reagents! more>
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(-)-2,6-BIS[2-[3AS-(2(3'AR*,8'AS*),3A,8A)-3A,8A-DIHYDRO-8H-INDENO[1,2-D]OXAZOLE]]PYRIDINE
Negotiable
Category: Chemicals/Heterocyclic Compounds/Pyridine
Company: Ningbo Syntame
Product Description: CAS NO:185346-09-2EC NO:Molecular Formula:C25H19N3O2Molecular Weight:393.44Synonyms:2,6-BIS((3AS,8AR)-8H-INDENO(1,2-D)OXAZO&;(-)-2,6-Bis[2-{3aS-(2(3'aR*,8'aS*),3aalpha,8aalpha)-3a,8a-dihydro-8H-indeno[1,2-d]oxazole}]pyridine,min.97%;(3aS,8aR)-in-pybox, (3aS,3μaS,8aR,8μaR)-2,2μ-(2,6-Pyridinediyl)bis[3a,8a-dihydro-8H-indeno[1,2-d]oxazole;2,6-Bis[(3aS,8aR)-3a,8a-dihydro-8H-indeno[1,2-d]oxazolin-2-yl]pyridine;(-)-2,6-Bis[2-{3aS-(2(3'aR*,8'aS*),3aalpha:,8aalpha:)-3a,8a-dihydro-8H-indeno[1,2-d]oxazole}]pyridine;(-)-2,6-Bis[2-{3aS-(2(3'aR*,8'aS*),3aα,8aα)-3a,8a-dihydro-8H-indeno[1,2-d]oxazole}]pyridine;(-)-2,6-Bis[2-[3As-(2(3'Ar,8'As),3A,8A)-3A,8A-Dihydro-8H-Indeno[1,2-D]Oxazole]]Pyridine;Molecular Structure: more>
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