What is the difference between potentiometry assay and HPLc assay?

Apotex, Aurobindo, Divis Laboratories, Torrent Power,

how std. of znso4

Which std. used for standrdisation of ZnSO4?

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,

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

Cipla,

what is mean by profiling of dissolution

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

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

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

Piramal Healthcare,

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

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

GVK,

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

APL,

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

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,

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,