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Why pyrene is also use for calibration if detector
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Bcoz. It gives higher absorbance band ,lambda max 373 nm .rather than caffeine. That's why
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principle of UV , PDA , RI detector in HPLC
In C8,C18....etc have 4&5 etc... microns Columns is there like that how to separate Chiral columns as per Micron size?
What is the accrptance criteria in RSD for RS method precision on basis of impurity percentages?
in monograph 7 imp are there but in vendor showing 5 imp do not req to include 2 imp for that what will be justification?
How to fix the sample conc. in Related substances test by HPLC?
In pharmacopeal solibility parameter of a material, is et essential to test all paramete? If 70-75% parameter passes can we assess that the material is satisfactory or not?
Why we are using K2Cr2O7 for control of absorbance in UV?
Which is the best mobile phase to separate organic acids using C8 column. And how should the samples be prepared for hplc?
why we use polystyrene film for ftir calibration?
What is the difference between spectro meter and spectro photo meter?
1 Answers APM, Graviti Pharmaceuticals, Ranbaxy,
What is Log p?
Why will a solution of aspirin without acid or basic hydrolysis give yellow colour with a solution of Ferric chloride?
Organic Chemistry 
