HFCS is the shorten name for High Fructose Corn Syrup. The name is indicative of its raw material and end product. It is made from corn starch. The corn starch is a long chain of glucose structure. Using an enzyme called amylase, the long chain of cornstarch is turned into shorter chain of glucose molecule.
Step 1: Cornstarch ----------> Multiple glucose molecule (Regular corn syrup)
Step 2: Glucose ----------> Fructose (High Fructose Corn Syrup)
Glucose is then converted into fructose through an enzyme called glucose isomerase. The end product is the high fructose corn syrup. Fructose is comparatively sweeter than the normal sucrose that we taste of our normal sugar- made from either cane or beet sugar.
If you would like to have more information, please visit http://www.sweetscam.com/how-its-made/