ravendranadhareddy


{ City } hydrabad
< Country > india
* Profession * officer
User No # 104269
Total Questions Posted # 5
Total Answers Posted # 8

Total Answers Posted for My Questions # 10
Total Views for My Questions # 32499

Users Marked my Answers as Correct # 29
Users Marked my Answers as Wrong # 20
Questions / { ravendranadhareddy }
Questions Answers Category Views Company eMail

hplc assay limit 98.0 to 105 why

Aurobindo, Hetero,

2 Organic Chemistry 13198

uv,ri,pda detactor principles ?

Aurobindo, Mankind, ZCL Chemicals,

1 Organic Chemistry 3787

ex:this product used c18 column but same product used c8 column what happend ?

Hygro Chemicals,

2 Organic Chemistry 6088

HPLC Calibration gradient method why used union ?

Hygro Chemicals,

2 Inorganic Chemistry 5456

NIR wave length range how much

Aurobindo,

3 Organic Chemistry 3970



Answers / { ravendranadhareddy }

Question { Zydus Cadila, 195850 }

What is diffrence between residue on ignition and sulphated
ash?


Answer

Both are same
sulphated ash BP & IP Method 600°C
residue on ignition USP method 800°C

Is This Answer Correct ?    8 Yes 4 No

Question { Jubilant Organosys, 36992 }

What is the difference b/w OVI Solvents and Residual
Solvents in case of Gas Chromatogaphy and What is its
Detection Limit?


Answer

both same but ovi solvent very low limit
rs solvents very high rs solvents 3 Class
I class toxic & hazaros not used proces
II Class caman solvents
III Class

Is This Answer Correct ?    2 Yes 0 No


Question { Matrix, 67636 }

what is the difference between M.C and LOD


Answer

mc :onely water content identificaton
lod:water & solvents identificaton

Is This Answer Correct ?    1 Yes 0 No

Question { MSN Pharma, 32177 }

In case of HPLC coloums what is the difference Between C8 &
C18 coloums & how can we select difference type of coloums
like Inertial ODS , Hypersil BDS , ODS etc.?


Answer

I think both columns polar columns
BDS column based deactivedd silane this hair ph basic nature
ODS Column Octa decyle silane acetic nature ph 7 below

Is This Answer Correct ?    4 Yes 6 No

Question { Pharmaceutical, 20504 }

In HPLC when we use Isocratic method, Gradient method in
hplc?


Answer

I think
Isocrtic same composition mobile phase but some impurites not eluted
Gradient diffrent mobilephases(acn:buffer) impurites eluted good

Is This Answer Correct ?    4 Yes 3 No

Question { Aurobindo, 13198 }

hplc assay limit 98.0 to 105 why


Answer

no

Is This Answer Correct ?    4 Yes 3 No

Question { Hygro Chemicals, 6088 }

ex:this product used c18 column but same product used c8 column what happend ?


Answer

i think rt changed

Is This Answer Correct ?    1 Yes 2 No

Question { Hygro Chemicals, 5456 }

HPLC Calibration gradient method why used union ?


Answer

I think
union flow rate 1.0 to 10.0
column flow rate 1.0 to 2.0
but low level noise identification

Is This Answer Correct ?    5 Yes 2 No