Answer / ram kumar

Firstly the basic difference is no. of Carbon atoms. C-18 has higher retention and Hydrophobicity as compared to the C-8.

What are usp limits for total impurities,unknown impurity

1 Answers   Dr Reddys,

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What is peak purity and response factor in chromatographic analysis? Why we required to find out response factor?

2 Answers  

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1)why use benzophenon,uracil in hplc calibration. 2)why use sucrose in polarimeter calibration. 3)what is S/N ratio, noise and drift in hplc 4)how we can find lod and loq in method validation

1 Answers  

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When we calculate Impurity against impurity std.solution and when we calculate impurity against diluted standard with applying RRF?

2 Answers   Torrent Pharma,

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Why caffeine as a reference standard used for calibration of HPLC?

11 Answers   Gangwal Chemicals, Orchid,

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How to know the estimated LOQ concentration in ppm

0 Answers  

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Can you please give a suitable definition and an example for understanding the words purity and potency.

6 Answers   Cipla, Malladi Drugs and Pharmaceuticals, Reddy Labs,

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What is difference between NDA & ANDA ?

1 Answers   Alembic,

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How to prepare ppm solution of Nacl form its salt?

5 Answers  

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what is analytical chemistry all about?

6 Answers   Dr Reddys,

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what is the differance between Analytical and semi micro balance?

2 Answers  

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How do you show that equal quanitities of two isomers provide the same response using a PDA

1 Answers  

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