Bio-solution · FI09 · Food ingredients
Citric acid by Aspergillus niger fermentation instead of extraction from citrus fruit
Replaces
Citric acid extracted from lemons, limes and other citrus (calcium citrate route, Italy and California before 1930)
Citric acid extracted from lemons, limes and other citrus (calcium citrate route, Italy and California before 1930)
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Scope
Submerged and surface fermentation of molasses, sucrose or starch hydrolysates by Aspergillus niger; food, beverage, detergent and pharmaceutical citric acid
Submerged and surface fermentation of molasses, sucrose or starch hydrolysates by Aspergillus niger; food, beverage, detergent and pharmaceutical citric acid
Suppliers 2
| COFCO Biotechnology 中粮科技 (SZ 000930) | China | active |
| ACICO | Saudi Arabia | active |
Route into Russia / EAEU FOOD
- Regulator
- Rospotrebnadzor / EAEU
- Typical time
- declaration of conformity, or SGR within 30 calendar days for new/specialized ingredients (plus tests)
- Legal basis
- TR CU 021/2011 (food safety) and TR CU 029/2012 (additives, enzymes, flavourings): declaration, or state registration (SGR) for new types
Information, not legal advice — confirm the procedure for your product.
Proof 7 claims
Old process
Extraction of citric acid from citrus fruit (e.g., lemons, limes, pineapple wastes).
Extraction of citric acid from citrus fruit (e.g., lemons, limes, pineapple wastes).
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New practice
Citric acid production via Aspergillus niger fermentation (submerged or surface culture) using substrates like molasses, sucrose, or cornstarch.
Citric acid production via Aspergillus niger fermentation (submerged or surface culture) using substrates like molasses, sucrose, or cornstarch.
- Displaced at scale?
- yes
- Caveats
- While the fermentation process has largely displaced extraction from citrus fruit, the sources note that extraction is still practiced in some small factories in developing regions like Mexico and Africa, though it is not significant in terms of global production volume.
- Hand review
- D3 Global: over 99% of world citric acid is made by fermentation (peer-reviewed review); cost fell from ~€1.0/kg (1920, lemon juice) to ~€0.2/kg by 1934.
- checked
- 2026-10-06
| Today, over 99 percent of the world's output of citric acid is produced microbially by fermentation, having replaced the traditional extraction from citrus fruits. “Although in South America, Mexico and Greece there still exists some factories where citric acid is isolated from unripe citrus fruits, today over 99 per cent of the world's output of citric acid is produced microbially by various fermentation processes, substrates and microorganisms.” global · 2007-2010 · majority share of a major market | peer-reviewed ✓ www.sciencedirect.com |
| The fermentation process became more affordable than extraction, with production costs dropping significantly by 1934 compared to 1920. “So efficient and affordable was the new process that as early as of 1934 the acid production cost, using today’s currency values, was €0.2/kg vs. €1.0/kg of 1920 when the acid was still obtained from lemon juice [16].” global · 1920-1934 · | peer-reviewed ✓ link.springer.com |
| The switch to fermentation was driven by the need for a more efficient, affordable, and scalable process to meet growing global demand, as extraction from fruit could not keep pace. “Since the late 1920s, however, the carbohydrate fermentation route has replaced extraction from lemon juice.” · 1920s-present · | peer-reviewed link.springer.com |
| In 1926, the output of citric acid using fermentation technology outpaced that from lemons and limes. “The success of this pilot plant meant that in 1926 when the first large-scale industrial plant opened, the output of citric acid using fermentation technology outpaced that from lemons and limes.” global · 1926 · large measured reduction of the old process | weak (company, news, market research, other) www.rethinkx.com |
| By 1929, Pfizer no longer used lemons and limes for its citric acid production, with all 10 million pounds produced by fermentation. “and by 1929, Pfizer no longer used lemons and limes for its citric acid production. All 10 million pounds were being produced by fermentation.” USA · 1929 · large measured reduction of the old process | weak (company, news, market research, other) ✓ www.rethinkx.com |
| By 1930, 90% of citric acid was made using fermentation. “By 1930, 90% of citric acid was made using fermentation and improvements to the process have continued to this day.” global · 1930 · majority share of a major market | weak (company, news, market research, other) ✓ www.rethinkx.com |
| Today, over 99% of the world's output of citric acid is produced microbially by fermentation. “Although in South America, Mexico and Greece there still exists some factories where citric acid is isolated from unripe citrus fruits, today over 99 per cent of the world's output of citric acid is produced microbially by various fermentation processes, substrates and microorganisms.” global · current · majority share of a major market | peer-reviewed ✓ www.sciencedirect.com |
Details
Replaces: citrus-fruit extraction · Scope: all commercial citric acid · Evidence: high
The chemical problem#
- Until the 1920s citric acid came from lemon and lime juice, precipitated as calcium citrate. Supply was tied to fruit harvests and concentrated in Sicily, with large price swings.
- Demand for the acidulant in soft drinks, food, detergents (as a phosphate-free builder) and pharmaceuticals far outgrew what fruit could supply.
- The old route needed about 30–40 t of lemons per tonne of acid and left the rest of the fruit as a processing problem.
Product overview#
Fermentation citric acid: Aspergillus niger strains overproduce citric acid from cheap sugars (cane or beet molasses, sucrose, glucose syrups from maize or cassava) under iron- and manganese-limited, low-pH conditions. Pfizer commercialised surface fermentation in the 1920s; submerged fermentation became dominant after World War II. Today the product is a commodity made at the million-tonne scale, mostly in China.
Active ingredient / Composition#
- Citric acid anhydrous or monohydrate (C₆H₈O₇), food grade E330; salts (sodium, potassium, calcium citrate).
- Produced by fermentation, recovered by calcium citrate precipitation or solvent extraction / ion exchange, crystallised.
Key facts#
| Parameter | Value |
|---|---|
| Share made by fermentation | >99 % of world output (peer-reviewed review) |
| Cost change | ~€1.0/kg (1920, lemon juice) → ~€0.2/kg by 1934 (fermentation), in today’s money |
| Feedstocks | Molasses, sucrose, starch hydrolysates (maize, cassava) |
| Organism | Aspergillus niger (yeasts such as Yarrowia lipolytica for some processes) |
| Regulatory | Food additive E330; EAEU TR CU 029/2012 |
Advantages#
- Decoupled from fruit harvests: supply follows sugar, not citrus.
- Five-fold cost drop within about 15 years of commercialisation.
- Enabled citric acid’s use as a biodegradable detergent builder replacing phosphates.
- A mature, licensable process: fermentation plants are a standard bio-industrial investment (EQ02).
Mode of action#
Under manganese and iron limitation, A. niger’s tricarboxylic-acid cycle is throttled at aconitase/isocitrate dehydrogenase while glycolytic flux stays high, so citrate accumulates and is excreted. Low pH suppresses by-products (gluconic and oxalic acid).
Application#
| User | Target | Method, timing and specifics |
|---|---|---|
| Beverage and food plants | Acidulant, preservative, chelator | Food-grade E330; replaces nothing today — it is the standard |
| Detergent makers | Phosphate-free builder | Sodium citrate in liquid and powder detergents (I07 context) |
| Sugar mills and starch plants | Feedstock outlet | Molasses or glucose syrup sold to citric-acid fermenters |
| Countries building local supply | Import substitution | Molasses-based fermentation plant (EQ02); Egypt’s first plant under construction (Cairo 3A) |
Limitations#
- The market is concentrated: Chinese producers dominate exports, and anti-dumping duties shape trade.
- Fermentation produces gypsum (from calcium citrate recovery) and wastewater — modern plants use solvent extraction or electrodialysis to cut it.
- A small number of fruit-extraction factories survive in South America, Mexico and Greece; they are not significant in volume.
Evidence of displacement — D3: proven displacement at scale#
Assessment (hand-reviewed): Global: over 99% of world citric acid is made by fermentation (peer-reviewed review); cost fell from ~€1.0/kg (1920, lemon juice) to ~€0.2/kg by 1934.
Verified figures (the number is in the quoted sentence and the sentence is on the source page):
- displacement — Today, over 99 percent of the world’s output of citric acid is produced microbially by fermentation, having replaced the traditional extraction from citrus fruits. (global, 2007-2010; peer-reviewed: sciencedirect.com)
- displacement — Today, over 99% of the world’s output of citric acid is produced microbially by fermentation. (global, current; peer-reviewed: sciencedirect.com)
- displacement — By 1929, Pfizer no longer used lemons and limes for its citric acid production, with all 10 million pounds produced by fermentation. (USA, 1929; weak: rethinkx.com)
- displacement — By 1930, 90% of citric acid was made using fermentation. (global, 1930; weak: rethinkx.com)
Suppliers — real products and services (from the vendor index)#
Companies below are active vendors in the vendor index whose own card (profile / official website) shows this product or service — matched 2026-10-06 by keyword and checked by hand against the card text. Being listed is not an endorsement; open each card for evidence, contacts and status.
| Company | Region · Country | What the index shows | Card |
|---|---|---|---|
| COFCO Biotechnology 中粮科技 (SZ 000930) | Asia · China | food ingredients incl. citric acid, starch sugar and MSG | card |
| ACICO | Africa/ME · Saudi Arabia | distributes food ingredients incl. citric acid (channel, not producer) | card |
Cairo 3A Group (Egypt) is building Egypt’s first citric-acid plant (due 2026) — not yet a supplier.
Government funding signals#
Scanned 2026-10-06.
China, Brazil, India — national research grants acknowledged in publications#
Papers since 2015 whose title matches “citric acid fermentation” and that acknowledge national government funders (Crossref funder metadata; conservative lower bounds). Signal bands used here: Strong ≥30 · Moderate 5–29 · Weak 1–4 · None 0.
| Country | Papers funded (2015–2026) | Signal | Example funded paper |
|---|---|---|---|
| China | 19 | Moderate | Multi-omics insights into the regulatory mechanism of citric acid in s (doi) |
| Brazil | 2 | Weak | – |
| India | 0 | None | – |
Scientific evidence#
- Berovic M, Legisa M (2007). Citric acid production. Biotechnology Annual Review 13: 303–343.
- Ciriminna R, Meneguzzo F, Delisi R, Pagliaro M (2017). Citric acid: emerging applications of key biotechnology industrial product. Chemistry Central Journal 11: 22.
- Note: journal references are checked against Crossref.
Bioeconomy value#
The oldest large-scale proof that fermentation can take over a commodity chemical completely: within a decade of commercialisation most of the world’s citric acid came from fermentation, and today more than 99 % does — driven by cost, not regulation.