The answer to #1 depends upon how you define large scale. Chromatography has been used for prep purposes; as far as I know mg to g quantities can be prepared this way.
#2. In theory you could dissolve the material in some solvent and subject both to chromatography. See if the spots travel the same distance and both materials have the same spots.
Chromatography is a powerful analytical technique for separating complex mixtures into their components. Do you think it would be practical to use it on a large scale for preparative purposes? Consider the problems this would involve.
You have a product for which counterfeit material is being marketed. Suggest how in principle you could identify a sample as counterfeit or genuine.
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