- What is similarity factor in HPLC?
- Why buffers are used in HPLC?
- What is resolution solution in HPLC?
- What is Q point in dissolution?
- What is a suitability test?
- What is carryover in HPLC?
- What is signal to noise ratio in HPLC?
- What is the system suitability parameters of HPLC?
- What is the pH of HPLC water?
- What is RRT and RRF in HPLC?
- What is RF and RRF?
- What is needle wash in HPLC?
- What are the system suitability parameters?
- What causes RSD failure in HPLC?
- What is plate count in HPLC?
- What is the basic principle of HPLC?
- What is tailing factor in HPLC?
- How is f2 value calculated?
- How do you calculate similarity factor?
- What is the function of HPLC?
- What is the system suitability?
What is similarity factor in HPLC?
Two standard Solutions were prepared by standard procedure, and result obtained by using HPLC.
Similarity factor = Weight of standard 1 X Area of Standard 2.
Weight of standard 2 Area of Standard 1.
Limit 🙁 0.98 – 1.02) It is observed that the results were within limit, so the similarity factor passed..
Why buffers are used in HPLC?
Since the retention of ionizable compounds is very sensitive to the mobile phase pH, it is necessary to control the pH of the mobile phase by the addition of a buffer. A buffer maintains the pH when a small amount of acid or base is added. … The most popular buffers for HPLC with UV detection are phosphate and acetate.
What is resolution solution in HPLC?
Resolution. The resolution of a elution is a quantitative measure of how well two elution peaks can be differentiated in a chromatographic separation. It is defined as the difference in retention times between the two peaks, divided by the combined widths of the elution peaks.
What is Q point in dissolution?
The quantity, Q is the amount of dissolved active. Dissolution Medium—Proceed as directed for Immediate- ingredient. specified in the individual monograph, expressed Release Dosage Forms under Apparatus 1 and Apparatus 2.
What is a suitability test?
Sterility method suitability testing is performed to determine whether any inhibitory or antimicrobial properties in a drug product will prevent the sterility test from detecting the presence of viable microorganisms. … Inhibitory properties can vary between drug products and components of a drug product formulation.
What is carryover in HPLC?
Carryover is recognized as the presence of a small peak that appears when a blank is injected after a sample that produces a large peak. Carryover can be one of the most frustrating problems in liquid chromatography (LC) practice.
What is signal to noise ratio in HPLC?
The signal-to-noise ratio (S/N) in a liquid chromatography (LC) separation usually is defined as shown in Figure 1. The noise is measured between two lines bracketing the baseline and the signal is measured from the middle of the baseline to the top of the peak. S/N is merely the signal divided by the noise.
What is the system suitability parameters of HPLC?
Primary SST parameters are resolution (R), repeatability (RSD—relative standard deviations—of peak response and retention time), column efficiency (N), and tailing factor (T). These parameters are most important as they indicate system specificity, precision, and column stability.
What is the pH of HPLC water?
7SpecificationsAdditional InformationVapor Pressure: 17.5mmHg at 20°CDensity1000g/cm³ColorColorlessBoiling Point100°CpH714 more rows
What is RRT and RRF in HPLC?
In high pressure liquid chromatography (HPLC), the compound is injected through a column of different sized beads. … The amount of time it takes for the compound to pass through the column is the retention time (RT). The relative retention time (RRT) is the comparison of the RT of one compound to another.
What is RF and RRF?
Response Factor (RF) = Peak Area. Concentration in mg/ml. Relative Response Factor (RRF) = Response Factor of impurity. Response Factor of API. RF in chromatography for different products are different and should be determined for individual substance.
What is needle wash in HPLC?
The needle in the HPLC system is used to introduce the sample into the mobile phase so that it can be separated on the HPLC column. The needle wash is used to clean the needle after an injection. The design of the needle in the injector system varies for different manufacturers.
What are the system suitability parameters?
System suitability test (SST) is a test to determine the suitability and effectiveness of chromatographic system prior to use. … These mixtures are used to establish characteristic chromatographic parameters, such as the number of effective theoretical plates, resolution, asymmetry, detection limit and selectivity.
What causes RSD failure in HPLC?
The most common cause of peak retention time drift in one direction is poorly prepared or mixed solvents or a system leak.
What is plate count in HPLC?
Theoretical plate number (N) is an index that indicates column efficiency. It describes the number of plates as defined according to plate theory, and can be used to determine column efficiency based on calculation in which the larger the theoretical plate number the sharper the peaks.
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 tailing factor in HPLC?
Definition: Tailing factor The tailing factor is a measure of peak tailing. It is defined as the distance from the front slope of the peak to the back slope divided by twice the distance from the center line of the peak to the front slope, with all measurements made at 5% of the maximum peak height.
How is f2 value calculated?
An average difference of 10% at all measured time points results in a f2 value of 50. FDA has set a public standard of f2 value between 50-100 to indicate similarity between two dissolution profiles. For a dissolution profile comparison: At least 12 units should be used for each profile determination.
How do you calculate similarity factor?
%CV=(standard deviation /mean)×100–(3). In our earlier publication, we stated that the approach 3 was the best amongst other approaches for calculating weight.
What is the function of HPLC?
High-performance liquid chromatography (HPLC) is a chromatographic technique used to split a mixture of compounds in the fields of analytical chemistry, biochemistry and industrial. The main purposes for using HPLC are for identifying, quantifying and purifying the individual components of the mixture.
What is the system suitability?
System suitability is defined by ICH as “the checking of a system, before or during analysis of unknowns, to ensure system performance.” System suitability criteria may include such factors as plate count, tailing, retention, and/or resolution.