From the literature that I get, first I need to separate saturated and aromatic using column chromatography. But I don't have enough sample. So what if I just use urea-adduct on raw?
It is possible in principle but I have never personally have use. Aromatic hydrocarbons can be separated from alkanes by extraction (N-methylpyrrolidone is industrial solvent for this). If you need only alkanes , reaction with HSO3Cl is useful - allow to stay mix on one week , or with overernight stirring. After water washing of upper layer, it contain only saturated hydrocarbons.
Some examples are described in J.March textbook (n-octane build clathrate with urea but 2-methyloctane (and 2-methylheptane) are not. Diameter of channels in urea is near 5Å ( angström ), so your hypothesis seems to be plausible.
For separation of minute amounts of volatile compounds, preparative gas chromatography is very suitable (if available)
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