What is the Difference Between Assay and Purity

The main difference between assay and purity is that an assay is the determination of one of the main component in a sample whereas purity is the determination of impurities in a sample. ... Assay and purity are two types of measurements used to determine the components of a sample.

1. What is the difference between purity potency and assay?
2. What is the meaning of assay in pharma?
3. What is the difference between chromatographic purity and related substances?
4. What does Assay mean in chemistry?
5. Why assay is more than 100?
6. Why assay is performed?
7. What is assay value?
8. Why assay is performed in pharmaceutical industry?
9. What is assayed gold?
10. What are the different types of impurities?
11. What is RRF HPLC?
12. How do you calculate impurities?

What is the difference between purity potency and assay?

The key difference between assay and potency is that an assay is the testing of a material to determine its ingredients and quality whereas potency is the amount of a drug required to get an effect at its maximum intensity. Usage of these two terms, assay and potency, are common in biochemistry and pharmacology.

What is the meaning of assay in pharma?

An assay is an investigative (analytic) procedure for qualitatively assessing or quantitatively measuring the presence, amount, or functional activity of a target entity (the analyte).

What is the difference between chromatographic purity and related substances?

Simply, chromatographic purity is a test ( usually TLC or HPLC ) where the sample is compared to some standards, and the spots/peaks of any impurities detected must not exceed the prescribed limits for size and number. ... Note that another category "process impurities" specifically excludes related substances and water.

What does Assay mean in chemistry?

An assay is a process of analyzing a substance to determine its composition or quality. The term is often used in the mining industry to refer to tests of ore or minerals. The term assay is also used in the environmental, chemical and pharmaceutical industries.

Why assay is more than 100?

There is a simple reason to have the purity greater than 100% for this compound. If the substance was exposed to a dry environment for several hours, a small amount of the water of hydration could be lost, causing the calculation to have a higher purity.

Why assay is performed?

Assay: An assay is an analysis done to determine: The presence of a substance and the amount of that substance. Thus, an assay may be done for example to determine the level of thyroid hormones in the blood of a person suspected of being hypothyroid (or hyperthyroid).

What is assay value?

The assay value measures the metal content as a percentage of the total weight. In other words, the ore might be 4% iron by weight (kilograms). The grade of the ore is the same thing. The term "grade" is more of a financial term. Assay value is simply a more scientific term for the same thing.

Why assay is performed in pharmaceutical industry?

Assay of products such as pharmaceutical suspensions and tablet coatings is a critical part of the Quality Assurance process. In some cases every batch of each product has to be tested, requiring 100% repeatability of results.

What is assayed gold?

Gold Assay - (n) a process to measure purity of items containing gold. The process of gold assaying is a way to ensure that gold coins or gold bullion bars produced by a gold mint meet the correct purity standards and content.

What are the different types of impurities?

The three different types of impurities in pharmaceuticals include organic, inorganic, and residual solvents. Most of these impurities occur due to manufacturing processes, degradation, storage conditions, excipients, or contamination.

What is RRF HPLC?

Relative Response Factor (RRF) is an analytical parameter used in chromatographic procedures to control impurities/degradants in drug substance and drug product. RRF is used to correct the difference in detector response of impurities with analyte peak. RRF is established by slope method with linear range of solutions.

How do you calculate impurities?

We have developed / validated a method where impurities are calculated by the known formula: %imp= (Atest/Aref)* limit. Comparison of the % percentage for an unknown imp.