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Assay is the quantitative determination of the amount of a component in a sample.
Purity is the determination of the impurities in the sample. It can be quantitative, semi-quantitative or qualitative.
For example : if you dissolve 4 grams of compound A (with no impurities in it) in 6 grams of water, you get a solution of compound A with 100% purity and 40% assay.
From the ICH Guideline Q2A (Validation of Analytical methods) :
"- Testing for impurities can be either a quantitative test or a limit test for the impurity in a sample. Either test is intended to accurately reflect the purity characteristics of the sample. [...]
- Assay procedures are intended to measure the analyte present in a given sample. In the context of this document, the assay represents a quantitative measurement of the major component(s) in the drug substance."
What else can I help you with?
What is the difference between assay on as is basis and assay on anhydrous basis?
assay on as is basis includes the sample+water content+residual solvents+others. but assay on as is basis takes water content into account that means weight of the water present in the sample will be added in weighing the sample quantity of API required.
What is an assay?
An assay is a scientific test or analysis used to measure the presence, amount, or activity of a substance or compound in a sample. Assays are commonly used in biology, chemistry, and medicine to study a wide range of biological and chemical processes.
What is the difference between qualitive and quantitative analytical methods?
they are both incredibly boring so no there is no difference ;)
What is difference between end point and kinetic assay in biochemistry?
In biochemistry, an endpoint assay measures the final amount of a product formed or substrate remaining after a reaction has stopped, providing a single data point. A kinetic assay, on the other hand, measures the rate of a reaction by recording multiple data points over time. Kinetic assays provide additional information about reaction mechanisms, enzyme activity, and inhibitor kinetics compared to endpoint assays.
Is assay by mass balance equivalent to assay by as is basis?
No, assay by mass balance and assay by as is basis are not equivalent. Assay by mass balance calculates the amount of a component based on material balance equations, while assay by as is basis measures the amount of a component without accounting for any changes or losses that may occur during processing.
What is the difference between inter-assay and intra-assay variability in laboratory testing methods?
Inter-assay variability refers to differences in results between different tests, while intra-assay variability refers to variations within the same test.
What is the difference between heat and product analysis in steel Why should this be?
what is the difference between product analysis and heat analysis
Whats the difference between accounts analysis and engineering analysis?
what is difference between accounts and engineering
What is the difference between heat analysis and product analysis?
manufacturing process of steel plates difference between heat and product analysis ?
What is the difference between assay on as is basis and assay on anhydrous basis?
assay on as is basis includes the sample+water content+residual solvents+others. but assay on as is basis takes water content into account that means weight of the water present in the sample will be added in weighing the sample quantity of API required.
What is the manufacturing difference between product analysis and heat analysis?
manufacturing process of steel plates difference between heat and product analysis ?
Difference between assay as is basis and dried basis?
Assay on 'as is' basis refers to the composition of a substance including its water content, while assay on 'dried' basis refers to the composition of a substance after removing the water content. Comparing these two types of assays can help in understanding the true chemical composition of a substance excluding the influence of water content.
The difference between a trend analysis and a comparative analysis?
Difference between e-resuming system of bdjobs and phrotom alo.com
What is the difference between functional cost analysis and engineering cost analysis?
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Difference between dynamic analysis and static analysis of mechanical design?
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What is the difference between anova and aov?
There is no difference.AOV = Analysis of VarianceANOVA = Analysis of Variance.
What is the Difference between value analysis and value chain analysis?
no different it's the same
