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Analytical Chemistry Interview Questions
Questions Answers Views Company eMail

What is the difference between potentiometry assay and HPLc assay?

Apotex, Aurobindo, Divis Laboratories, Torrent Power,

2 15437

how std. of znso4

1 3779

Which std. used for standrdisation of ZnSO4?

1 2109

In GC and HPLC ,how we can decide which of following method will be suitable or use for quantitation of chromatogram at the time of method development. 1.Area Normalisation 2.External standard method 3.Internal standard method

Atul,

1 6194

In Stability testing if significant change occurs then what will be the action plan?

Cipla,

2 10448

what is mean by profiling of dissolution

1 6613

How decided 10 ppm standard solution in Swab, rinse method.?

2 7377

WHAT IS THE LIQUID PHASE IN DB-624 COLUMN IN GCHS

3 7997

In capadity factor formula is K'= (RT of main compound/RT of first eluted peak)-1 in this formula what is 1

Piramal Healthcare,

1 5870

WHICH STANDARD WE USE IN SILICA ANALYSIS IN SILICA-GEL METHOD FOR SOLID SAMPLE

1428

Why we inject a standard 6 times for Related substances by HPLC and 5 times for Assay?

GVK,

3 17969

In HPLC (Waters) software Empower1,2 &3 what is the updation for each version

APL,

2176

hii, i'm had a sample of 1L that gone through extraction & evaporation. i used 0.5ml of methanol for reconstitution before injecting the sample to HPLC. i made a calibration curve using a standard solution but now i'm confused about how to display the concentration i got from the sample. for ex. i got 0.2ug/ml how i'm gonna explane this is for the 1L ? please help .. i'll really appreciate it thanks

1 3156

Dear Sir, This is Thirunavukkarasu am working in Ordain Health Care AR&D, Am Having one problem While doing method development my question Metadoxine and Pyridoxine same chemical nature and structural activity i tried lot of methods but Analyte eluted same Retantion time i cant separate both peaks. solubility, pH both are same only only difference melting point metadoxine 210 C Pyridoxine 102 C please do the help needful for me

Ordain Solutions,

5 7518

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 ?

Micro Labs, VMSRF,

1827


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Un-Answered Questions { Analytical Chemistry }

Why we used in n-butyl acetate water content terminology while in ethyl acetate we used moisture content terminology?

1197


How can the GC or HPLC method is selected to determine the impurity profile in drug product?

6514


how require to set assay concentration for standard and sample?

105


what is mean by ambient temperature?

107


pharma industries oriented

1484






Hi sir if any product monograph not given known impurities (may be 5 impurities) specifications then how we require to proceed for inhouse formulation?

106


In BP2013, Loperamid HCl monograph. Assay by titration with 0.1N sodium hydroxide using hydrocloric acid 0.01N and reading the volume added between the 2 points of inflexion. I have a question that if the diluent solvent is ethanol is certainly consumed a amount of volume of titrant, so this volume must be eliminated on the result calculation or not apart from first point which is subtracted above.

2349


why lactose has less charges when packed in steel containers when compared with packing of lactose in polyamide material?

1586


In which situation we require to prepare the standard solution from sample in Related substance method?

114


what is the acceptance criteria for enteric coated tablets in 0.1n hcl validation in each parameter?

135


What is the principle of Thermal conductivity detector and FID?

2084


how a particular wavelength can be different for a particular compund while analysing by uv and by HPLC.

1663


What is the main difference between ODS1 and ODS2 Hplc column.

3990


please explain about aluminium hydroxide assay

529


What is shaking level in GC?

108