Antibiotic intermediates (6-APA, 7-ACA): Production route
How moulds and enzymes make the core of antibiotics
What this tab covers How it is made: the main production routes or, for product families, the main product types and technologies, compared on share of supply, inputs per tonne, plant scale, yield, co-products and unit cost.Every beta-lactam core starts in a fermenter. Penicillin G is fermented, recovered as the potassium salt and split enzymatically to 6-APA. Cephalosporin C is fermented and converted to 7-ACA by two enzymes (D-amino acid oxidase and glutaryl acylase) or in one step with engineered acylases. 7-ADCA can be fermented directly. Enzymatic routes replaced older chemical cleavage using silylation and chlorinated solvents at very low temperature, cutting solvent use. Scale, strain productivity and power cost decide who wins.
Routes compared
| Route | Share of supply | Inputs per tonne | Typical scale | Yield | Co-products | Unit cost |
|---|---|---|---|---|---|---|
| Penicillin G fermentation | all penicillin G | glucose, corn steep liquor, phenylacetic acid, large electricity for aeration and cooling (not published per t) | Lyfius 15,000 t/yr; Chinese leaders larger (not published) | not published | mycelium biomass, spent broth, solvent | MIP Rs 2,216/kg (about $25/kg at Rs 88/$) indicates Indian cost level; DGTR non-injurious price reference Rs 2,500/kg |
| Enzymatic 6-APA | almost all 6-APA (indicative) | about 1.7 t penicillin G potassium per t 6-APA at 100% yield (stoichiometric) | not published | high (indicative) | phenylacetic acid (recycled to fermentation) | MIP Rs 3,405/kg (about $39/kg) |
| Cephalosporin C fermentation and enzymatic 7-ACA | almost all 7-ACA; China dominant | about 1.5 t cephalosporin C per t 7-ACA at 100% yield (stoichiometric) | not published | not published | glutaric acid derivatives | not published |
| Clavulanic acid fermentation | not published | not published | Kinvan 400 t/yr (India, PLI) | not published | biomass | not published |
How each route works
Penicillin G fermentationFed-batch aerobic fermentation of Penicillium chrysogenum with glucose and phenylacetic acid as side-chain precursor, over about a week. Broth is filtered, acidified, solvent-extracted and crystallised.
very scale-sensitive; needs cheap power
Aurobindo (2024); Medical Dialogues (2026); World Trade Scanner on DGTR (2026) Enzymatic 6-APAPenicillin G potassium is hydrolysed in water by immobilised penicillin G acylase at mild pH and temperature; 6-APA is crystallised and phenylacetic acid recovered.
clean aqueous process; tied to penicillin G cost
Medical Dialogues (2026); stoichiometry Cephalosporin C fermentation and enzymatic 7-ACAAcremonium chrysogenum ferments cephalosporin C; enzymes remove the aminoadipyl side chain to give 7-ACA.
India has no confirmed commercial 7-ACA plant (not confirmed)
stoichiometry Clavulanic acid fermentationStreptomyces clavuligerus ferments clavulanic acid, a beta-lactamase inhibitor combined with amoxicillin (co-amoxiclav).
unstable molecule; specialised handling
PSU Watch (2026) Unit economics are indicative ranges from the sources named; costs move with feedstock and energy prices, plant size and region.