What is the cell used in volumetric karl fischer titrimetry?

Galvanic Cell or electrolytic cell ? What is the detection technique?

08 September 2012 4,148 2 View

How to prepare and increase yield for acetal synthesis?

I am mixing some chemicals along with propylene glycol with some aldehydes, in some instances there is a formation of acetal but other times not. Does anybody know the thermodynamics & kinetics...

07 August 2012 5,833 2 View

Which is the precise ionization and %area is close to absolute % between MS ionization (GCMS) and FID ionization (GCFID)? Why?

Are the % area of TIC of GCMS and FID comparable? if not why? What is detector linearity? i worked with absolute % (Pharma) of sample composition and also % area composition (in CRO, Synthetic...

09 October 2011 7,638 3 View

How to prepare sample & analyze a volatile content in beverages?

I need to compare two products of same brand by GC / GCMS, i have tried to extract the volatile part of the aqueous beverage by using CH2Cl2, pentane:diethyl ether; but the volatile are very less....

09 October 2011 2,067 6 View

Any body using super critical fluid extraction for analytical sample preparation?

Please tell me the Make/Model of super critical fluid extraction apparatus which can be used for analytical sample preparation. Thanks

08 September 2011 1,232 1 View

What are retention indices in GC, GCMS?

What are retention indices in GC, GCMS?

08 September 2011 3,436 11 View

No title

It is having GPIB Communication; old data acquisition software-HP Chemsation. data analysis is not so good. Sensitivity of the instrument is in question. How could I utilize the instrument...

08 September 2011 1,243 1 View

Anybody using "Y" Splitter for GCMS?

I am using 'Y' splitter for our GCMS, it connected tat column outlet and one part is going to MS and another is going to FID; i have a sensitivity problem in FID and RT differences ( TIC-MS is...

08 September 2011 4,600 7 View

Anybody knows about automated volatile oil determination methods?

We have a classical method of analysis to determine volatile oil in the natural products. It is time consuming- taking 4 hours. How can I improve the tech? Many thanks

08 September 2011 1,734 2 View

No title

08 September 2011 2,452 2 View

MD MOE RMSD

How to calculate the RMSD values for a MD simulation using MOE?

07 August 2021 0 0 View

MD MOE RMSD

How to calculate the RMSD values for a MD simulation using MOE?

07 August 2021 0 0 View

fatal error

When I tried to energy minimization my system, I got fatal error as below. Fatal error: Atomtype opls_116 not found Although I've already added this line: ; include water #include "oplsaa.ff/spc.itp" to [molecultype] directive in my topology.

16 June 2021 0 0 View

fatal error

When I tried to energy minimization my system, I got fatal error as below. Fatal error: Atomtype opls_116 not found Although I've already added this line: ; include water #include "oplsaa.ff/spc.itp" to [molecultype] directive in my topology.

16 June 2021 0 0 View

fatal error

When I tried to energy minimization my system, I got fatal error as below. Fatal error: Atomtype opls_116 not found Although I've already added this line: ; include water #include "oplsaa.ff/spc.itp" to [molecultype] directive in my topology.

16 June 2021 0 0 View

fatal error

When I tried to energy minimization my system, I got fatal error as below. Fatal error: Atomtype opls_116 not found Although I've already added this line: ; include water #include "oplsaa.ff/spc.itp" to [molecultype] directive in my topology.

16 June 2021 0 0 View

flexibility of polymers chain

effect of double bond on the flexibility of polymers

07 April 2021 0 0 View

Formulation of polymer color flakes

I am writing to request some information for making polymer color flakes. I would appreciate the help.

17 March 2021 0 0 View

I am interested in medicinal chemistry field, which books are highly recommended to learn from?

I am at the beginner level in drug design and drug discovery, and I am interested to learn more about this field. Which books are highly recommended to start from and gives me all essential...

02 March 2021 8,437 2 View

How Relativistic effects is one reason for lanthanide contraction?

The Lanthanide contraction which is the decrease in ionic radii of the elements in the lanthanide series from atomic number 57, lanthanum, to 71, lutetium, is due to poor shielding of the 4f...

01 March 2021 2,272 4 View