Chromatography

Why is chromatography so useful for analysis of mixtures in Chemistry and Biochemistry? You can learn visiting the following sites:
http://www.rpi.edu/dept/chem-eng/Biotech-Environ/CHROMO/chromintro.html

How to prepare your sample for microscale flash column chromatography:
http://orgchem.colorado.edu/hndbksupport/colchrom/colchromprocmicroflash.html

HPLC chromatography:

http://www.youtube.com/watch?v=kz_egMtdnL4&list=PLnu__ug2a65zD8fzKPq9uePcFGCtb3Cxl

Gas-liquid chromatography:

http://www.youtube.com/watch?v=08YWhLTjlfo&list=PLnu__ug2a65zD8fzKPq9uePcFGCtb3Cxl