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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 14272

how std. of znso4

1 3331

Which std. used for standrdisation of ZnSO4?

1 1678

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 5605

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

Cipla,

2 9206

what is mean by profiling of dissolution

1 6186

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

1 6673

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

3 7215

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 5415

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

1198

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

GVK,

3 15592

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

APL,

1841

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 2799

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 6661

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,

1537


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Un-Answered Questions { Analytical Chemistry }

why we are using hexane in calibration of number of drop per mL

586


What is intact assay method development.....?

1519


How can we confirm the HPLC column is end-capped or not? Is it possible to identify by physical appearance?

2241


in gas chromatography what is the difference between gas flow rate and average linear velocity ?

1357


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

626






what is partion and column chromatography

1377


how will you do the prep for unstable componds?

1012


how you determine moist.of NaOH sol or NaOH flacks

1395


How would you decide dissolution medium for NCE compound of class I drug

1130


what is the origin to prepare standard operating procedure

1342


Why do we use KMnO4 in the test of control of obsorbance ? and why do we take specific quantity i.e 57-63mg?

1763


Which type of column should i use to check the purity of high molecular weight protein using HPLC reverse phase column chromatography? Hi everyone. I wanna to check the purity of high molecular weight protein (collagen) with MW of ~130 kDa using a HPLC. I know C18

1003


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

1841


While performing TOC sst analysis Zero shift disabled & sample analysis zero shift enabled why?

1614


how can give the expiry period and restadardisation of volumetric solution

1637