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Concentration of sample= estimated LOQ concentration (µg/mL) x 1/desired LOQ (%) x 100LOQ should be Equal to or less than 0.05% of that of test concentration. Response of the impurity should be NLT 2000 at LOQ level for better precision.
Wiki User
∙ 11y ago
To fix retention time shifts (RS) in HPLC, you can try the following:
- Check for column stability and ensure it is properly equilibrated.
- Optimize mobile phase composition and flow rate to improve peak sharpness.
- Verify sample preparation and injection conditions to ensure consistency.
- Regularly maintain and calibrate the HPLC system to ensure accurate results.
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What type of species can be separated by HPLC but not by gas liquid chromatography?
mixture of enantiomers can be separated by HPLC
How do you find the amount sodium citrate in a cough mixture using hplc?
To find the amount of sodium citrate in a cough mixture using high-performance liquid chromatography (HPLC), you would first create a calibration curve using known concentrations of sodium citrate. Then, you would run the cough mixture through the HPLC and compare the peak area or height of the sodium citrate in the sample to the calibration curve to determine the concentration.
Can melamine detect by HPLC?
Yes, melamine can be detected by HPLC (High Performance Liquid Chromatography). HPLC is a common analytical technique used to separate and quantify compounds in a mixture, including melamine. Detection methods such as UV-Vis spectroscopy or mass spectrometry can be used in conjunction with HPLC to identify and quantify melamine accurately.
Why volatile compounds are analysed in gc but not in hplc?
GC can give very resolved sharp peaks with short run time compared to hplc. additionally, there is less compatibility issue in setting an MS up to a GC than HPLC
Which are the top commercial uses for HPLC?
HPLC is used to analyze, identify, purify and quantify organic compounds.
What is rs-hplc?
"RS-HPLC method" means "Related Substance HPLC Method".
What is assay by HPLC?
Assay by HPLC refers to using high-performance liquid chromatography (HPLC) as a technique to quantify the presence and concentration of a specific compound or analyte in a sample. HPLC separates and analyzes components within a mixture based on their interactions with the mobile and stationary phases, allowing for accurate measurement of analyte concentrations. It is commonly used in pharmaceutical, environmental, and food industries for quality control purposes.
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whats wrong with it?
How buffer concentration effects on retention time in hplc method?
Buffer concentration can affect retention time in HPLC by influencing the pH of the mobile phase, which can in turn impact interactions between the analyte and stationary phase. Higher buffer concentrations can alter the ionization state of the analyte, leading to changes in its retention time. Additionally, buffer concentrations can also affect peak shape and resolution in the chromatogram.
How do you distinguised np-hplc and rp-hplc?
NP-HPLC (normal phase HPLC) separates compounds based on their polarity, where the stationary phase is polar and the mobile phase is nonpolar. RP-HPLC (reverse phase HPLC) separates compounds based on their hydrophobicity, where the stationary phase is nonpolar and the mobile phase is polar. RP-HPLC is more commonly used due to its versatility and ability to handle a wider range of compounds.
What analytic method is more preferrable betwee GC and HPLC?
The choice between gas chromatography (GC) and high performance liquid chromatography (HPLC) depends on the properties of the compounds being analyzed. GC is typically used for volatile compounds with low to medium molecular weight, while HPLC is more suitable for non-volatile or thermally unstable compounds. Ultimately, the decision should be based on the specific needs of the analysis, such as analyte characteristics and detection requirements.
How do you calibrate for HPLC?
To calibrate an HPLC system, you typically use a calibration standard containing known concentrations of target compounds. Inject the standard into the HPLC system, establish calibration curves by plotting peak area vs concentration, and use this to quantify unknown samples. Regular calibration is important for ensuring accuracy and precision in HPLC analysis.
Retention time calculation for hplc?
why RT was shifting & how to RT calculation in HPLC
What type of species can be separated by HPLC but not by gas liquid chromatography?
mixture of enantiomers can be separated by HPLC
Where can one purchase HPLC detectors?
You can purchase used HPLC detectors and other equipment from the usedhplc website or from the ebay bidding website. Alternatively you can buy HPLC detectors from the equipnet website.
How do you find the amount sodium citrate in a cough mixture using hplc?
To find the amount of sodium citrate in a cough mixture using high-performance liquid chromatography (HPLC), you would first create a calibration curve using known concentrations of sodium citrate. Then, you would run the cough mixture through the HPLC and compare the peak area or height of the sodium citrate in the sample to the calibration curve to determine the concentration.
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Remove inner door panel for access
