what is difference between assay&purity&potency?
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Answer / falguni
Assay : We compare the area of product with working
reference Standard of that product.It also may calculate as
basis, on anhydrous basis or on dried basis.
Purity : We compare the area of our product with area of
other impurities which comes in our product.
Potency : We compare the area of product with working
reference Standard of that product, but after removing the
sum of heavy metals, sulfated ash, LOD and moisture.
| Is This Answer Correct ? | 31 Yes | 4 No |
Answer / bhargav
Purity:
It is calculated by area normalisation method, it can be
directly find out by chromatograms obtained from HPLC.
% Purity = (Area of desired peak / Sum of area of all
peaks) x 100
Assay:
It is calculated against standard. It may be of following
types:
1) On as is basis = (Area of sample / Area of standard) x
(conc. of standard / conc. of sample) x potency or assay of
standard
2) On anhydrous basis = (Assay on as is basis / 100 –
moisture) x 100
3) On dried basis = (Assay on as is basis / 100 – LOD) x 100
Potency:
100 – (moisture or LOD + residual solvents + heavy metals
+ sulphated ash + impurities)
| Is This Answer Correct ? | 17 Yes | 2 No |
Answer / a.prabhakar
Purity :
It explains how pure our analyte is in the given mixture.
It is not related to the how much our analyte is in the given mixture.
i.e.: Percentage of a our analyte without impurities in HPLC.(Known or Unknown)
Assay:
It explains how much our analyte is in the given mixture (The content of our component in the given mixture).It is not related to analyte purity.
Potency :
It is measurement of our analyte how potent it is.
i.e: Purity of our analyte without all possible impurities like chromatographic impurities (HPLC, GC-Residual solvents, moisture, TLC), heavy metals, sulphated ash...etc
| Is This Answer Correct ? | 10 Yes | 0 No |
Answer / ala
in the answer above the first two definitions is true
for potency there is relation ship between potency and activity of the product as antibiotics and i am sure its related to micro lab
| Is This Answer Correct ? | 2 Yes | 5 No |
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Organic Chemistry 
