Obtain starch from flour ?

[Externet]

Greetings.   From corn flour, or tapioca flour, or wheat flour... ;  can you obtain their 3 respective starches ?  How is it done ?   

I read  "Flour contains high levels of starch, but starch does not contain any flour"  OK, fine, no problem.     Also read all starches are very simple and the same.   Does it mean the starches 'extracted' from the different flours mentioned above are equal ?   

[exchemist]

25 minutes ago, Externet said:

Greetings.   From corn flour, or tapioca flour, or wheat flour... ;  can you obtain their 3 respective starches ?  How is it done ?   

I read  "Flour contains high levels of starch, but starch does not contain any flour"  OK, fine, no problem.     Also read all starches are very simple and the same.   Does it mean the starches 'extracted' from the different flours mentioned above are equal ?   

Starch is a term for polysaccharide polymers, assembled from glucose monomer units. However there can be differences in molecular weight and in degrees of chain branching, not to mention grain size and possibly other physical characteristics, depending on the source.