Microorganism-free enzyme-based reaction systems are now used for the production of hydrogen, bioelectricity, and useful biochemicals. In these biosystems, raw materials called substrates are broken down by a series of enzymes (i.e., biological catalysts) to obtain the desired end-product. In several cases, the substrates are carbohydrates such as sucrose, cellulose, or starch. In the first step of these reactions, sucrose is converted to glucose derivatives like ɑ-glucose 1-phosphate (ɑ-G1P) or glucose 6-phosphate (G6P), which serve as important intermediates for further reactions.
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Source: Phys.org