Fermentation-grade sugar explained (glucose and dextrose)
Fermentation-grade sugar is high-purity glucose, the industrial form commonly called dextrose, supplied as the carbon and energy source for fermentation. Conventionally it is hydrolysed from corn starch or extracted from cane; it can also be produced from carbon and energy directly. Purity, consistency, and price stability are what fermentation operators care about.
What it is
Fermentation-grade sugar is high-purity glucose prepared to a standard that microorganisms can ferment cleanly. In industry the glucose form is usually called dextrose. It is the carbon and energy source the microbe consumes.
Glucose, dextrose, sucrose, the terms
Glucose is the simple six-carbon sugar microbes prefer. Dextrose is the common industrial name for glucose, specifically D-glucose, typically produced by breaking down (hydrolysing) corn or other starch. Sucrose is table sugar, a glucose-fructose pair extracted from cane or beet; it is used in some fermentations but is a different molecule. When people talk about the sugar feedstock for biomanufacturing, they usually mean glucose/dextrose.
Why "fermentation-grade" matters
- Purity, free of contaminants that would inhibit or poison the culture.
- Consistency, the same composition batch to batch, so fermentations are predictable.
- Low inhibitors, none of the by-products that some crop or waste processing leaves behind.
- Price stability, predictable cost so downstream economics hold.
How it is made today
Conventionally, dextrose is produced by hydrolysing corn starch with enzymes or acid into glucose, then purifying it; cane and beet supply sucrose by extraction. Both routes are agricultural, so the sugar inherits crop economics and variability.
How it can be made from carbon and energy
The same fermentation-grade glucose can be produced from carbon and energy via the carbon-to-sugar route, giving consistent, high-purity sugar without the crop cycle, and with lower carbon intensity on a modelled basis.
Where Solarferm fits
Solarferm produces fermentation-grade sugar from carbon and energy and licenses the technology to produce it elsewhere, supplying the glucose feedstock that fermentation runs on.
In practice the fermentation sugar is glucose, bought as dextrose (crystalline D-glucose) or glucose syrup, not table-sugar sucrose. Solarferm's fermentation-grade sugar is glucose, the same molecule fermentation already runs on, made from carbon and energy rather than from a crop. See dextrose, the feedstock industrial fermentation runs on.
Frequently asked questions
What is fermentation-grade sugar?
High-purity glucose (commonly supplied as dextrose) prepared to a standard that microorganisms can ferment cleanly and consistently.
Is dextrose the same as glucose?
Effectively yes. Dextrose is the common industrial name for D-glucose, usually produced by hydrolysing starch. It is the form most fermentation uses.
What is the difference between glucose and sucrose for fermentation?
Glucose is a single simple sugar microbes consume directly; sucrose is table sugar, a glucose-fructose pair. Glucose/dextrose is the typical fermentation feedstock.
Why does purity matter?
Contaminants and inhibitors can slow or poison a culture and make fermentations inconsistent, so feedstock purity and batch-to-batch consistency directly affect yield and economics.
Can fermentation sugar be made without crops?
Yes. The same fermentation-grade glucose can be produced from carbon and energy via the carbon-to-sugar route, without the crop cycle.
References
- Good Food Institute. Driving down costs of fermentation-derived ingredients: a meta-analysis of techno-economic models. Good Food Institute, Washington, DC. 2025. doi:10.62468/trxj5734
- USDA Economic Research Service. Sugar and Sweeteners: background, data, and outlook. U.S. Department of Agriculture. 2025. https://www.ers.usda.gov/topics/crops/sugar-and-sweeteners Accessed 14 June 2026.
- McKinsey & Company. Ingredients for the future: bringing the biotech revolution to food. McKinsey & Company. 2025. https://www.mckinsey.com/industries/agriculture/our-insights/ingredients-for-the-future-bringing-the-biotech-revolution-to-food Accessed 14 June 2026.
- 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