Dear Selda,

You won't be able to separate the normal alkanes from the branched/cyclic 
alkanes using silica column chromatography. However, there are two standard 
methods for doing this separation, one is urea adduction and  the second 
utilises a molecular sieve. We have used both methods in our laboratory and 
I'd be happy to dig up the relevant protocols should you require them.

Cheers,

Ian

--On 07 September 2006 14:08 +0300 Selda BAYIR <[log in to unmask]> wrote:

>
>
> Dear All,
>
>
>
> I'm attempting to run n-alkane carbon isotopes.
>
> I must separate n-alkanes from branced/cyclic alkanes.
>
> But in our laboratory we only have silicagel column in order to separate
> saturate fraction.
>
> Does anyone have suggestions for this method?
>
>
>
>
>
>
>
> Selda BAYIR
>
> Chemical Engineer
>
> Turkish Petroleum Corporation
>
> Research Center / Geochemistry Department
>
> Stable Isotope Laboratory
>
> Ankara/Turkey
>
> Email: [log in to unmask]



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Dr Ian D. Bull
Organic Geochemistry Unit (OGU)
Bristol Biogeochemistry Research Centre
School of Chemistry
University of Bristol
Bristol  BS8 1TS
United Kingdom

Tel.        +44 (0)117 9546967
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Email      [log in to unmask]
Website  www.ianbull.me.uk

"I left in love, in laughter, and in truth,
and wherever truth, love and laughter abide,
I am there in spirit."

                    - Bill Hicks (1961-1994)
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