In my analysis by HPLC,In sample main peak and placebo peak are eluting with shorter resolution ( almost look like doublet). how can i get max resolution ? Is changing gradient method is usefull?3 8743
what is the need of calulation of RRF of impurity in HPLC analysis?9 22238
why SGF media used for dissolution . What is the use of it .can we use other media of lower pH instead ot this?1 6246
what is difference between UV - VISIBLE MODEL NO like 1600,1601,1700 etc ? plz explain me1296
How do we get end points and how many end points are possible for citric acid and di-acid not theorotically answer should be given practically.1283
only one end point is possible for citric acid and we get 2 end points for di acid why?3 5481
For Recent draft guidelines for Dissolution test apparatus calibration, why removing the salicylate tables?3 6755
what is the diff betwen calibration and system suitability?8 13917
why chiral separation?1 6130
what are the important specifications for a Column ?2 7274
HI,I CLEARED BOB CLERK EXAM. MY INTERVIEW WILL BE ON 9TH OCTOBER,2010.PLEASE SEND ME INTERVIEW QUESTIONS AND ANSWERS. THANK YOU.
2. Two grams of Benzoic acid are dissolved in 200 ml of water and extracted with 200 ml of diethyl ether. The distribution coefficient of benzoic acid is 100, and its dissociation constant is 6.5 10-5. Calculate the distribution ratio (D) of benzoic acid at pH 2, 5, and 6. 3. Calculate D at pH 2 to 10 (1 unit apart) in the above problem, and plot D versus pH.
My question about gas chromatography sulfur chemiluminsecence detector. I test unknown sample gas by GC-SCD (calibrated ) and the result of *H2S is 279 PPM , *but when I test the same sample with the GC-TCD (calibrated ) the value of *H2S is 2500 PPM . I'd like to inform you that both GCs are calibrated and have very good operation conditions with stable parameters . the question is if the sample gas with higher H2S over detection limits of SCD detector (1000 ppm). why the result it 279 ppm Best regards
how to calculate corelation coefficient in G.C Calibration? what is the calculation part?
Tell me something about Vitamin A test method by HPLC
How can the GC or HPLC method is selected to determine the impurity profile in drug product?
What is stray light in uv what are units for stray light
In HPLC calibration, caffeine is used as primary standard for wave length calibration due to caffeine is having dual maxima at 273 & 205 nm and one minima at 245 nm. Any body can give reference of these details from any pharmacopeia (with chapter no.) or any other authentic guideline?
What is control room temperature and which guide line says?
some product having water content method with pyridine and ethylene glycol mixture instead of methanol? how they are selecting and methanol is not suitable solvent how ?
how can I make the copper get white bye any salt or acit?
How do we get end points and how many end points are possible for citric acid and di-acid not theorotically answer should be given practically.
how much mass should be there in volumetric flask while in preparation of sample for assay?
How will u perform degradation study in detectors other thann PDA in HPLC Methodology