What is the basic principle of HPLC?
The separation principle of HPLC is based on the distribution of the analyte (sample) between a mobile phase (eluent) and a stationary phase (packing material of the column). Depending on the chemical structure of the analyte, the molecules are retarded while passing the stationary phase.
What is the separation technique used in HPLC?
High-performance liquid chromatography is a chromatographic technique used to separate the components in a mixture, used mainly to identify each component, and to quantify each component. Separation is based on the analyte’s relative solubility between two liquid phases. …
What is the principle of chromatographic method?
Chromatography is based on the principle where molecules in mixture applied onto the surface or into the solid, and fluid stationary phase (stable phase) is separating from each other while moving with the aid of a mobile phase.
What is the role of mobile phase in TLC?
After the sample has been applied on the plate, a solvent or solvent mixture (known as the mobile phase) is drawn up the plate via capillary action. Because different analytes ascend the TLC plate at different rates, separation is achieved. The mobile phase has different properties from the stationary phase.
What is assay test in HPLC?
Assays based on HPLC are very commonly used to measure the quality of drugs and, according to ICH, certain parameters must be checked to validate the analytical method: linearity, specificity, accuracy, precision (inter and intraday), limit of detection (LOD), limit of quantitation (LOQ) and robustness (ICH-Q2B, 2005; …
Is the mobile phase polar or nonpolar?
Principle. In normal-phase chromatography, the stationary phase is polar and the mobile phase is nonpolar.
What is slope in HPLC?
Slope tells the integrator how much baseline rise to expect. A high slope value means that peak starts will be marked later than a low slope value, all other things being equal.
Why UV detector is used in HPLC?
HPLC UV/Visible detectors are used with high performance liquid chromatography to detect and identify analytes in the sample. The analyte can be identified by measuring the sample’s absorption of light at different wavelengths. Therefore, it is important to choose an appropriate wavelength based on the type of analyte.
