Interested to Buy Any Domain ? << Click Here >> for more details...
what is the peak purity concept?
- 5 Answers
- 29098 Views
- Graviti Pharmaceuticals, Vimta Labs, I also Faced
- E-Mail Answers
Answers were Sorted based on User's Feedback
Peak purity analysis is an evaluation technique for
detecting the presence of coeluting impurities in HPLC
data. Running a peak purity check prior to analytical
quantitation helps to ensure accuracy. In the development
of analytical methods, peak purity analysis can reveal the
presence of contamination during standardization and, by
doing so, can prevent the subsequent generation of false
analytical data.
Peak purity analysis is also a useful addition to routine
quality control procedures, especially in the analysis of
pharmaceuticals and food products, for which contamination
and quality of results are critical.
| Is This Answer Correct ? | 22 Yes | 2 No |
Answer / rahul jain
The concept of Peak purity is generally used in HPLC using PDA detector. PDA detector scan a single peak at various points, if peak is pure than the uv spectrum of peak at different points will be same but if peak is not pure than uv spectrum of peak at different points will not be same.
| Is This Answer Correct ? | 15 Yes | 5 No |
Answer / king_suresh-chelika
Peak purity concept is spectrally homogeneity of a perticular peak, if two or more peaks having same polarity, then they will come at same RT (most probably some times merge with each other)
Even though they have different uv absorption, due to same polarity, peaks merged or co elution observed.
In this case, angle will be higher than threshold,results peak purity fails
| Is This Answer Correct ? | 3 Yes | 0 No |
A technique is described whereby the purity of an HPLC peak
can be determined by using electrospray liquid
chromatography-electrospray ionization mass spectrometry.
Electrospray mass spectra acquired across an HPLC peak are
summed and examined for co-eluting impurities. The mass
spectrometer is set up to produce solely cationised
molecules and background noise is minimized so that minor
coeluting impurities can be observed down to a level of
<0.1% of the major component. This method offers advantages
over using diode-array UV detection (LC-DAD) for the
determination of HPLC peak purity, namely components with
similar UV spectra can be distinguished, the molecular mass
of the impurity can be determined and structural data can
be obtained by using tandem mass spectrometry (MS-MS). The
effectiveness of the technique is demonstrated with drug
substances of pharmaceutical interest which have been
chromatographed on an HPLC system designed to intentionally
co-elute a number of impurity standards with these
compounds.
| Is This Answer Correct ? | 5 Yes | 4 No |
Answer / v.rambabu
The particular peak does not coeluted with other impurities
purity= The ratio of absarbance between the root of up
slope and apex/The ratio of absarbance between the root of
down slope and apex
| Is This Answer Correct ? | 2 Yes | 3 No |
when we use pda detector in hplc instead of uv detector
How to Calibrate NMR instrument ?
Why will a solution of aspirin without acid or basic hydrolysis give yellow colour with a solution of Ferric chloride?
which solvent is highest poler acetonitrile dimethyl formamide methanole tetrahydrofurane buffer solution
Why do we use sodium salicylate for Calibration TLC Cabinet U.V Lamps
what r the reasons to get peak telling?
what is regration method in method validation , how we can calculate it.
Why the same type of columns showing different RT for a single product?
which one is better separation in high pressure liquide chromatogram orlowpressure chromato gram in hplc
what is difference between polarity and dipolemoment
why octanol used to determine the partition coefficient ?
why we use sodium salicylate in uv light calibration at TLC chamber
1 Answers Aurobindo, Lee Pharma,
Organic Chemistry 
