Glucose, dextrose, sucrose, fructose, and HFCS: sugar terminology for fermentation
The sugar words get used loosely, but for fermentation the distinctions matter. Glucose and dextrose are the same molecule; sucrose (table sugar) is glucose joined to fructose; fructose and high-fructose corn syrup are sweeteners, not the usual fermentation feed. Industrial fermentation runs mostly on glucose, bought as dextrose. Beyond sugars, fermentation can also use glycerol, cellulosic sugars, and single-carbon feedstocks.
Glucose and dextrose: the same molecule
Glucose is the simple sugar most life runs on. Dextrose is just its industrial name: crystalline D-glucose, the same molecule, sold as a powder or syrup. When a fermentation process is described as fed on glucose or on dextrose, it means the same thing. This is the workhorse sugar of industrial fermentation. See dextrose, the feedstock industrial fermentation runs on.
Sucrose: table sugar, a different thing
Sucrose is table sugar, refined from sugarcane or sugar beet. It is a disaccharide: one glucose unit joined to one fructose unit. It can be split (hydrolysed or inverted) into glucose and fructose, and some fermentations use it directly, but in the United States it is not the default fermentation feed. Sucrose also sits inside a supply-managed sugar program that holds its US price above world levels, which is part of why US fermentation leans on corn dextrose instead.
Fructose and high-fructose corn syrup
Fructose is a single sugar, sweeter than glucose, found in fruit and honey. High-fructose corn syrup (HFCS) is made by taking corn-derived glucose and isomerising part of it to fructose; more than 70% of HFCS is sold as HFCS-55 (about 55% fructose). HFCS is overwhelmingly a food sweetener, not the standard feed for industrial fermentation, though it comes from the same corn wet-milling complex as dextrose.
Glucose syrup, dextrose equivalent, maltodextrin, molasses
A few related terms a buyer will meet. Glucose syrup is starch partially broken down to a mix of glucose and longer chains. Dextrose equivalent (DE) measures how far that breakdown has gone, pure dextrose is DE 100. Maltodextrin is a low-DE starch hydrolysate. Molasses is a sucrose-rich byproduct of sugar refining, used as a cheap feed in some fermentations.
So which does fermentation use?
Mostly glucose, bought as dextrose. It is the molecule microbes metabolise most readily, and the one most processes are designed around. What a buyer actually contracts for is not just the sugar but a specification: purity, consistency, and freedom from inhibitors, which is what fermentation-grade means.
Beyond sugars: other fermentation feedstocks
Sugars are not the only carbon source fermentation can run on. Glycerol, a co-product of biodiesel, is used in some processes. Cellulosic or second-generation sugars are glucose released from plant biomass and crop residues; the chemistry works, but supply is capped by how much residue can be sustainably collected, so it is not an unlimited substitute. And single-carbon (C1) feedstocks, such as carbon dioxide, carbon monoxide, methanol, and formate, can feed engineered microbes directly; these are field examples of the wider carbon-source landscape, not a description of any one company's inputs. See C1 chemistry and how sugar feedstocks compare.
Where Solarferm fits
Solarferm makes fermentation-grade glucose, the same molecule sold industrially as dextrose, from carbon and energy rather than from a crop. It targets the workhorse sugar fermentation already runs on, from a different source, with cost and carbon figures stated as modelled projections it is building to demonstrate.
Frequently asked questions
Is dextrose the same as glucose?
Yes. Dextrose is the industrial name for crystalline D-glucose, the same molecule. Process descriptions use the words interchangeably.
What is the difference between sucrose and glucose?
Sucrose, table sugar, is a disaccharide of glucose joined to fructose. Glucose is a single sugar. Industrial fermentation mostly uses glucose, not sucrose.
Is HFCS the same as sugar?
High-fructose corn syrup is a corn-derived glucose and fructose mixture with sweetness similar to sucrose. It is mainly a food sweetener, not the standard feed for industrial fermentation.
What sugar does industrial fermentation use?
Mostly glucose, bought as dextrose. It is the sugar microbes metabolise most readily and the one most processes are designed around.
Is fructose used in fermentation?
Some processes can use it, but glucose and dextrose dominate; fructose and HFCS are mainly sweeteners rather than fermentation feed.
Are sugars the only fermentation feedstock?
No. Fermentation can also run on glycerol, cellulosic sugars from biomass, and single-carbon feedstocks such as carbon dioxide, carbon monoxide, methanol, and formate.
References
- Comprehensive life cycle assessment of the corn wet milling industry in the United States. Frontiers in Energy Research. 2023. doi:10.3389/fenrg.2023.1023561
- National Research Council. Biobased Industrial Products: Priorities for Research and Commercialization. National Academies Press, Washington, DC. 2000. https://www.ncbi.nlm.nih.gov/books/NBK232954/ Accessed 14 June 2026.
- USDA Economic Research Service. Corn and Other Feed Grains: Feed Grains Sector at a Glance. U.S. Department of Agriculture, Economic Research Service. 2025. https://www.ers.usda.gov/topics/crops/corn-and-other-feed-grains/feed-grains-sector-at-a-glance Accessed 14 June 2026.