HPLC - 399 Anuncios

Lunes 30 septiembre 2019

HPLC columns are widely used in many fields, whose column efficiency, capacity, permeability characteristics, and service life are very important. After using for a period of time, there will be changes such as column pressure increase, column efficiency decrease, etc. If no measures are taken...

Domingo 29 septiembre 2019

There are many types of chromatographic methods, and different classification methods can be used from different perspectives. Classification from the state of two phases. In the chromatography, the mobile phase may be a gas or a liquid, and thus can be classified into gas chromatography...

Sábado 28 septiembre 2019

Depending on the packing of the HPLC column. The following column types are available on the market: 1. Silica gel HPLC column: Silica gel is the earliest chromatographic column packing used in liquid chromatography. It has a wide range of applications. However, it can only be used...

Miércoles 25 septiembre 2019

Knowledge of QuEChERS Quick, Easy, Cheap, Effective, Rugged, Safe are generally abbreviated to QuEChERS. It is a sample pretreatment method for agricultural product detection. It is used to absorb and remove impurity, and the operational principle is similar to high-performance liquid...

Miércoles 25 septiembre 2019

General requirements for adsorbents: large surface area and certain adsorption capacity. Does not chemically change with the developing agent, does not react with or catalyze, decompose or associate with the substance to be separated, and the particles are uniform. Silica gel and...

Martes 24 septiembre 2019

Ion Chromatography is one of high-performance liquid chromatography (HPLC) and is a liquid chromatography method for the analysis of anions and cations. In a narrow sense, ion chromatography is a chromatographic method in which a low exchange capacity ion exchange resin is used as...

Viernes 20 septiembre 2019

Syringe filter can be used in the analysis of high performance liquid chromatography and IC. It is an important step in sample pretreatment to filter sample solution. The syringe filter with high quality is produced by using the most advanced detection means and production technology...

Viernes 20 septiembre 2019

Hawach Scientific company specializes in the production of PES filter membrane, stable quality, products exported to Europe, North America, and other countries. We have more than 16 years of experience in the filtration industry. Pore size : 0.1um /0.22um/0.45um/0.65um/0.8um/1.2um Diamter ...

Viernes 20 septiembre 2019

Silica matrix HPLC columns are generally compatible, but organic polymer matrix columns may expand or contract in some solvent combinations, which will affect their chromatographic behavior. Wash each solvent system at least 20 volumes. Because some solvent systems are highly viscous...

Jueves 19 septiembre 2019

The determination of 10 plant polyphenols in tobacco samples by solid phase extraction and high-performance liquid chromatography as below: Plant polyphenols are important substances in tobacco. The content of polyphenols in tobacco has an important influence on tobacco quality. Therefore...

Jueves 19 septiembre 2019

It is a liquid chromatography using a chemically bonded phase as a stationary phase, which is formed by chemically reacting an organic molecule to a surface of a carrier (silica gel) by a covalent bond to form a uniform, firm monolayer thin layer. The separation mechanism is both...

Miércoles 18 septiembre 2019

In the analysis of HPLC, the packing size of chromatographic column is small, and it is easy to be blocked by impurity particles. Therefore, samples and solvents need to be pre-filtered to remove particulate pollutants and protect chromatographic columns and instruments. Ion chromatography...

Lunes 16 septiembre 2019

The syringe filter is mainly used for the filtration of solvent samples, which holds a crucial position in the sample prefiltration procedure, especially in the HPLC sample analysis. There are two basic aspects of the syringe filter that should be learned and memorized clearly. Composition...

Lunes 16 septiembre 2019

Reversed phase chromatography (RP) is the most widely used technique in high-performance liquid chromatography (HPLC) up to now, mainly because it is suitable for the analysis of most of them. Nonpolar substances and many ionizable and ionic compounds. Most stationary phases used...

Jueves 12 septiembre 2019

As an important branch of chromatography, high-performance liquid chromatography (HPLC) has become an important application of separation and analysis technology in the fields of chemistry, medicine, industry, agriculture, commodity inspection, and law inspection. Features of high-performance...

Miércoles 11 septiembre 2019

For an inhalation automatic sample vial, the sample is sucked into the sample ring by the suction generated by the syringe. This design of automatic sample vial was very popular in the early days because of its simplicity and reliability. However, with the emergence of the other two designs...

Miércoles 11 septiembre 2019

When storing the column, the column should be filled with acetonitrile or methanol, and the column joint should be tightened to prevent the solvent from evaporating and drying. It is absolutely forbidden to leave the buffer solution in the HPLC columns for an overnight or longer period of time...

Sábado 07 septiembre 2019

There are bubbles in the mobile phase, the pump is turned off, the pressure relief valve is opened, the purge button is turned on, the degas is cleaned, the bubbles are continuously ejected from the HPLC column, and the mobile phase enters the mobile phase. No matter how many times...

Martes 03 septiembre 2019

Hawch disposable syringe filter is a fast and reliable filtering tool commonly used in laboratories. With the beautiful appearance, light weight and high cleanliness, it is quite available in basically any kind of filtration experiments, including food analysis, bio-fuel analysis...

Martes 03 septiembre 2019

Chemical properties of the chromatographic column could affect the performance of the C18 HPLC column. Performance factors of C18 HPLC columns: bonding type Single tooth bonding can improve the mass transfer rate and accelerate column balance. Double tooth bonding can increase the...

Viernes 30 agosto 2019

Cantidad : 100pcs - Precio : 6,00 €

China Lab Supplies Limited utiliza una tecnología de unión patentada para unir los septos a las tapas de polipropileno, mientras mantiene las bajas propiedades de sangrado de los septos. Esta tecnología única está disponible actualmente en tapas de rosca de 24-414, 9 mm y 13-425....

Viernes 30 agosto 2019

Cantidad : 100pcs - Precio : 2.35usd

- Los sellos superiores de aluminio de 11 mm tienen una abertura más grande para garantizar una penetración adecuada de la aguja de 2 ml, los viales de 12X32 mm están fabricados con Clear, Tipo 1 - Clase A o Ámbar, vidrio de borosilicato de Clase B Tipo 1 e incluye un parche de...

Viernes 30 agosto 2019

Cantidad : 100pcs - Precio : 2.35usd

- Tapas de rosca, septas y viales de 9 mm, diseñados especialmente para el uso con Agilent's y otros muestradores giratorios o de brazo robótico, 2ml, 12X32mm. - Viales se fabrícan del vidrio borosilicatado Transparente, Tipo 1 Clase A o Ámbar, Tipo 1 Clase B y llevan parches...

Viernes 30 agosto 2019

Cantidad : 100pcs - Precio : 2.35usd

- Tapas de rosca, septas y viales de 9 mm, diseñados especialmente para el uso con Agilent's y otros muestradores giratorios o de brazo robótico, 2ml, 12X32mm. - Viales se fabrícan del vidrio borosilicatado Transparente, Tipo 1 Clase A o Ámbar, Tipo 1 Clase B y llevan parches...

Viernes 16 agosto 2019

NH2 HPLC columns refer to the chromatographic columns that use silica gel as matrix carrier to bond amino groups. They are usually used for the analysis of carbohydrate compounds, and the mobile phase is usually methanol, acetonitrile and buffers salt solution. - The cleaning method...

Jueves 15 agosto 2019

Glass solvent filters are used for solvent particle removal and water phase mobile phase filtration. All components of glass solvent filters in contact with solvents are made of chemically inert glass or PTFE materials, which are used in combination with regenerated cellulose (RC)...

Miércoles 14 agosto 2019

Flash column chromatography is an alternative to long column chromatography developed in 1978. This method aims to separate the components from the mixture and thereby purify it. It is built from existing long column chromatography techniques and is time-consuming and often unsatisfactory...

Miércoles 14 agosto 2019

Physical properties of the chromatographic column could affect the performance of C18 HPLC columns. - Performance factors of C18 HPLC columns: - Silica gel purity Class A silica gel has high residual silica hydroxyl with a negative charge and high metal content on the acidic surface...

Lunes 12 agosto 2019

The system of an HPLC column is composed of a liquid, a reservoir, a pump, a sampler, a column, a detector and a recorder. - The packing material of HPLC columns - The packing material has high carbon content, small surface polarity, very low chemical purity and high surface separation...

Viernes 09 agosto 2019

Reversed-phase chromatography (RPC) contains any chromatographic method using a non-polar stationary phase. The word “reverse” has a historical background. In the 1970s, most liquid chromatography was performed on unmodified silica or alumina. Their surface chemistry is hydrophilic...