Anybody knows about automated volatile oil determination methods?

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What is the cell used in volumetric karl fischer titrimetry?

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

08 September 2012 4,260 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 5,975 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 7,741 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 2,176 6 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 4,723 7 View

What are retention indices in GC, GCMS?

08 September 2011 3,574 11 View

Is it possible to utilize an old Gas chromatograph “HP 5890 with auto sampler" effectively?

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 1,340 1 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 1,346 1 View

It is better to be roughly right than precisely wrong. —John Maynard Keynes

It is better to be roughly right than precisely wrong. —John Maynard Keynes You all have probably heard the story about Malcolm Forbes, who once got lost floating for miles in one of his...

08 September 2011 2,573 2 View

Anybody using gamma spectrometer?

What is the use of it.

08 September 2011 6,564 1 View

Which type of compound does lamda max of 218 indicate in a uv-vis spectrum of a partially purified compound through column and TLC?

A crude extract of fungal culture using EtOH was subjected to column and TLC and partially purified compound was obtained. UV vis spectrum of the compound/s has max absorbance at 218nm. The...

11 August 2024 9,801 2 View

Can you connect an HPLC to a Mass Spec only at a certain time point?

Can anyone explain this method? Especially the last statement where it says only at 1.5 to 2.5mins was the MS/MS connected to the UPLC. How is that possible, is it a feature in this specific...

11 August 2024 8,141 3 View

GC-MS retention index prediticon?

Hello experts, Does anyone know any free software about retention index prediction ?

08 August 2024 7,403 2 View

Can I use a HisTRAP column for affinity chromatography?

I'm working on selecting antibodies against a recombinant protein that has a His-tag. My idea is to first bind the recombinant protein to a HisTRAP column and then use this column for an affinity...

07 August 2024 505 3 View

Why is TLC not a form of partition chromatography?

Why is TLC not a form of partition chromatography and paper chromatography not a form of absorption chromatography?

03 August 2024 7,035 3 View

Is there any Indian Company or Startups, from any universiy or IITS, which manufacture Gas Chromatography instrument , i want to make a custOmized G?

or we can collaborate

01 August 2024 6,705 2 View

Is there a good freeware software for photodocumentation of TLC?

I need something like Camag's VisionCat software for photodocumentation of TLCs. Could you recommend something?

31 July 2024 8,415 1 View

How to improve peaks separation in HPLC?

Hi everyone, I'd like to better separate two close peaks coming from a bioconversion sample, I'm currently using a C18 KromaPhase 4,6mm Ø.I. SCHARLAU, particle size (µm): 10, pore size (Å): 100,...

30 July 2024 435 3 View

Gas chromatography RT detection?

I am working on algal extract to which gas chromatography (Not GC-MS) spectrum I want to discover. My question is can we identify specific compounds using retention time if I compared the RT with...

29 July 2024 8,034 4 View

Problems with ion exchange chromatography?

I'm having problems with ion exchange chromatography. After applying my sample (a fluorescent protein), a preferential path inevitably forms. The matrix I use is DEAE-Sephacel. Could someone...

27 July 2024 6,605 0 View