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because in normal phase HPLC mobile phase is non polar and stationary phase is polar. Most of the compound of interest are polar, if you increase the polarity of mobile phase compound of analyte will stay in mobile phase and will elute faster and retention time will be shorter.

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What are all the parameters that have impact on the polarity of C8 and C18 columns?

The key parameters that impact the polarity of C8 and C18 columns are the length of the alkyl chain attached to the silica surface, the mobile phase composition, the pH of the mobile phase, and the column temperature. These factors influence the retention and selectivity of compounds on the stationary phase.


What would you expect to influence an Rf value?

An Rf value, or retention factor, is influenced by several factors including the polarity of the stationary phase and the mobile phase used in chromatography. The nature of the solvent (its polarity and composition) can significantly affect how compounds interact with the stationary phase, altering their movement. Additionally, temperature and the specific characteristics of the compounds being separated, such as their size and polarity, can also impact the Rf values obtained.


What is the comment about the polarity of the stationary phase and mobile phase?

The polarity of the stationary phase and mobile phase in chromatography significantly influences the separation of compounds. Generally, if the stationary phase is polar, it will retain polar compounds more strongly, while non-polar compounds will move faster with the mobile phase. Conversely, a non-polar stationary phase will favor the separation of non-polar compounds. Understanding this polarity interaction is crucial for optimizing separation processes.


How can you select mobile phase?

Choose a buffer that is well within 1+/- pH unit of its pKa to ensure the best use. Details of buffer preparations can be found within the internet. Ensure the pH of your mobile phase is at a point at which it will hinder ionisation of the compound under analysis, i.e. very low pH for an acidic compound (low pKa) and high pH for a basic compound (high pKa/low pKb) to prevent ionisation. In this form more reproduce able analysis can be governed.


How separated nadh nad nadph and nadp in hplc?

In HPLC, NADH, NADPH, and NADP can be separated using a reverse-phase column with a suitable mobile phase, often involving a combination of water and organic solvents like acetonitrile or methanol. The differences in their charge and polarity allow for distinct retention times; NADH and NADPH are typically retained longer due to their reduced forms and higher polarity. A gradient elution can enhance separation, while UV detection at specific wavelengths helps in identifying and quantifying each nucleotide. Proper sample preparation and pH adjustment of the mobile phase can further improve resolution.

Related Questions

What will be the effect of pH on retention time?

Changes in pH can alter the degree of ionization of analytes, affecting their interaction with the stationary phase and mobile phase. This can impact retention time by changing the polarity and charge of the analytes, leading to variations in their retention on the column. Different analytes may respond differently to changes in pH, resulting in shifts in retention times.


What are all the parameters that have impact on the polarity of C8 and C18 columns?

The key parameters that impact the polarity of C8 and C18 columns are the length of the alkyl chain attached to the silica surface, the mobile phase composition, the pH of the mobile phase, and the column temperature. These factors influence the retention and selectivity of compounds on the stationary phase.


What are the key differences between reverse phase and normal phase HPLC techniques?

Reverse phase and normal phase HPLC techniques differ primarily in the polarity of the stationary phase and mobile phase. In reverse phase HPLC, the stationary phase is nonpolar and the mobile phase is polar, while in normal phase HPLC, the stationary phase is polar and the mobile phase is nonpolar. This polarity difference affects the retention and separation of compounds in the sample.


What are the key differences between normal phase chromatography and reverse phase chromatography?

Normal phase chromatography and reverse phase chromatography are two types of chromatographic techniques that differ in the polarity of the stationary and mobile phases. In normal phase chromatography, the stationary phase is polar and the mobile phase is nonpolar, while in reverse phase chromatography, the stationary phase is nonpolar and the mobile phase is polar. This difference in polarity affects the retention and separation of compounds in the sample.


What are the key differences between reverse phase chromatography and normal phase chromatography?

Reverse phase chromatography and normal phase chromatography are two types of chromatographic techniques that differ in the polarity of the stationary phase and mobile phase. In reverse phase chromatography, the stationary phase is nonpolar and the mobile phase is polar, while in normal phase chromatography, the stationary phase is polar and the mobile phase is nonpolar. This difference in polarity affects the retention and separation of compounds in the sample being analyzed.


What would you expect to influence an Rf value?

An Rf value, or retention factor, is influenced by several factors including the polarity of the stationary phase and the mobile phase used in chromatography. The nature of the solvent (its polarity and composition) can significantly affect how compounds interact with the stationary phase, altering their movement. Additionally, temperature and the specific characteristics of the compounds being separated, such as their size and polarity, can also impact the Rf values obtained.


What are the differences between reverse phase HPLC and normal phase chromatography techniques?

Reverse phase HPLC and normal phase chromatography are two types of chromatography techniques that differ in the polarity of the stationary phase and mobile phase. In reverse phase HPLC, the stationary phase is non-polar and the mobile phase is polar, while in normal phase chromatography, the stationary phase is polar and the mobile phase is non-polar. This difference in polarity affects the separation of compounds based on their interactions with the stationary phase, leading to different retention times and selectivity in each technique.


What are the key differences between reverse phase and normal phase chromatography techniques?

Reverse phase chromatography and normal phase chromatography are two common techniques used in separation and analysis of compounds. The key difference lies in the polarity of the stationary phase and mobile phase. In reverse phase chromatography, the stationary phase is non-polar and the mobile phase is polar, while in normal phase chromatography, the stationary phase is polar and the mobile phase is non-polar. This difference in polarity affects how compounds interact with the stationary phase, leading to differences in retention times and separation capabilities.


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What is the comment about the polarity of the stationary phase and mobile phase?

The polarity of the stationary phase and mobile phase in chromatography significantly influences the separation of compounds. Generally, if the stationary phase is polar, it will retain polar compounds more strongly, while non-polar compounds will move faster with the mobile phase. Conversely, a non-polar stationary phase will favor the separation of non-polar compounds. Understanding this polarity interaction is crucial for optimizing separation processes.


How can you select mobile phase?

Choose a buffer that is well within 1+/- pH unit of its pKa to ensure the best use. Details of buffer preparations can be found within the internet. Ensure the pH of your mobile phase is at a point at which it will hinder ionisation of the compound under analysis, i.e. very low pH for an acidic compound (low pKa) and high pH for a basic compound (high pKa/low pKb) to prevent ionisation. In this form more reproduce able analysis can be governed.