Controlled fruit ripening with ethylene (including ethylene from bio-ethanol) in ripening rooms — instead of calcium carbide
Calcium carbide (CaC₂) "masala" ripening of mango, banana, papaya and other fruit (acetylene release); ethephon dips at excessive doses (partly)
Suppliers 1
| Restrain | United Kingdom | active |
Route into Russia / EAEU EAC
- Regulator
- EAEU accredited bodies / Rosakkreditatsiya
- Typical time
- declaration registered within 3 working days (testing extra); certification longer
- Legal basis
- EAEU technical regulations (TR CU 010/2011, 004/2011, 020/2011); EEC Board Decision No. 41 (20.03.2018) on registering declarations
Information, not legal advice — confirm the procedure for your product.
Proof 5 claims
Artificial ripening using calcium carbide (masala) to release acetylene gas.
Controlled ripening using ethylene gas or ethephon in regulated chambers.
- Displaced at scale?
- no
- Caveats
- While ethylene-based ripening is promoted as a safer, legal alternative, the illegal use of calcium carbide persists in commercial practice, particularly among farmers and smaller traders, due to its lower cost and speed. There is no evidence of a complete displacement of calcium carbide by ethylene-based methods at a national or global scale.
- Hand review
- D1 Pilot only: 46 ethylene ripening chambers set up by the Punjab Mandi Board (FSSAI).
- Market
- Alternative: ; Incumbent: ; Status: context;
- checked
- 2026-10-06
| Calcium carbide remains in use for fruit ripening in India and other developing countries despite being banned, because it is cheaper and faster than legal alternatives. “The low price of carbide results in its indiscriminate use in artificial ripening of fruits.” India, Côte d'Ivoire, and other developing countries · 2018-2026 · | government or intergovernmental www.fssai.gov.in |
| Ethylene-based ripening is more expensive and takes longer than calcium carbide, but provides more even ripening and better quality. “Ethylene takes a little longer and costs more, but gives more even ripening.” India, Philippines · 2020-2026 · | weak (company, news, market research, other) stvnational.com |
| A pilot facility with 46 ethylene gas-based ripening chambers with a capacity of 460 metric tonnes was established in Punjab, India, to replace calcium carbide. “The pilot facility with 46 ethylene gas based ripening chambers of capacity of about 460 metric tonne has been established by Punjab Mandi Board at 12 fruit and vegetable markets of Punjab.” Punjab, India · 2018 · pilot or niche | government or intergovernmental ✓ www.fssai.gov.in |
| The Food Safety and Standards (Prohibition and Restrictions On Sales) Regulations, 2011, prohibits the use of acetylene gas (calcium carbide) for the artificial ripening of fruits. “No person shall sell or offer or expose for sale or have in his premises for the purpose of sale under any description, fruits which have been artificially ripened by use of acetylene gas, commonly known as carbide gas; provided that fruits may be artificially ripened by use of Ethylene gas at a concentration upto 100 …” India · 2011 · | weak (company, news, market research, other) sansad.in |
| A pilot facility with 46 ethylene gas-based ripening chambers with a capacity of 460 metric tonnes was established by the Punjab Mandi Board, and private entrepreneurs added 825 metric tonnes of capacity in Punjab. “The pilot facility with 46 ethylene gas based ripening chambers of capacity of about 460 metric tonne has been established by Punjab Mandi Board at 12 fruit and vegetable markets of Punjab. In addition, about 825 metric tonne capacity of ripening chambers established by private entrepreneurs has also come up in Punjab …” Punjab, India · 2018 · pilot or niche | government or intergovernmental ✓ fssai.gov.in |
References 2
- Saltveit ME (1999). Effect of ethylene on quality of fresh fruits and vegetables. *Postharvest Biology and Technology* 15: 279–292. VERIFIED DOI · cited by 522
- FSSAI (Food Safety and Standards Authority of India). Food Safety and Standards (Prohibition and Restrictions on Sales) Regulations, 2011: prohibition of the us NOT CHECKED — regulation …
Details
Replaces: calcium carbide ripening · Products: climacteric fruit · Evidence: high
The chemical problem#
In South and Southeast Asia, Africa and parts of the Middle East, traders ripen mangoes, bananas and papayas by putting calcium carbide packets in fruit boxes. Moisture releases acetylene, a weak ethylene analogue. Industrial carbide is contaminated with arsenic and phosphorus compounds, which can form arsine and phosphine gases. Workers and consumers are exposed, and the fruit colours on the outside while staying unripe and poor-tasting inside. Food-safety authorities in India, Bangladesh, Pakistan, Nigeria, Kenya and other countries prohibit it, yet enforcement is weak. Imported fruit from these regions can reach any market, including Russia.
Product overview#
Ethylene is the natural ripening hormone that fruit produce themselves. Commercial ripening uses:
- Ripening rooms with controlled temperature (about 15–20 °C), humidity (90–95 %), air circulation and ethylene at about 100–150 ppm for 24 h, followed by ventilation to remove CO₂. This is standard for bananas in Europe and Russia.
- Catalytic ethylene generators: convert ethanol into ethylene on site. With bio-ethanol this is a renewable, bio-based ripening agent, suitable for small traders and cooperative ripening chambers.
- Low-cost ripening chambers promoted by the Indian government (National Horticulture Board) and FAO projects for smallholders and traders.
- Natural ripening: stacking with already ripening fruit (a traditional method, slow but chemical-free).
Active ingredient / Composition#
Ethylene gas (C₂H₄) from cylinders or ethanol-based catalytic generators; controlled atmosphere and temperature.
Key facts#
| Parameter | Value |
|---|---|
| Class | Natural plant hormone (ethylene), bio-based when produced from bio-ethanol |
| Typical exposure | About 100–150 ppm for 24 h at 15–20 °C, then ventilation (fruit-specific) |
| Residues | None (ethylene is a gas and naturally present in fruit) |
| Safety | Flammable at high concentrations (the lower explosive limit is 2.7 % = 27,000 ppm, far above the ripening dose); ventilation required |
Advantages#
- No arsenic or phosphorus contamination, and no worker poisoning.
- Uniform ripening with full flavour and aroma, which brings higher prices and less waste.
- Ethylene from bio-ethanol links to the agricultural bioeconomy (sugarcane or cereal ethanol).
Mode of action#
Ethylene binds to its receptors in the fruit and triggers the climacteric ripening programme: starch → sugar conversion, softening (pectinases), aroma volatiles, and chlorophyll breakdown with colour change.
Application#
| Fruit | Program | Specifics |
|---|---|---|
| Banana | Ripening room 14–18 °C, ethylene 100–150 ppm for 24 h, ventilate, then 4–6 days to colour stage | Standard commercial practice (EU/RU importers) |
| Mango, papaya | Ripening chamber 20–25 °C, ethylene about 100 ppm for 24 h | Harvest at physiological maturity (immature fruit will not ripen properly) |
| Avocado | Ethylene conditioning (“ready-to-eat” programs) | – |
| Smallholders/traders | Cooperative low-cost chambers + ethanol generators | Training and enforcement against carbide |
Limitations#
- Requires investment in chambers (low-cost designs exist) and training.
- Works only for climacteric fruit (not for grapes, citrus ripening; citrus degreening is a separate process).
- Enforcement is essential, because carbide is cheaper per box.
Evidence of displacement — D1: works, adoption not proven#
Assessment (hand-reviewed): Pilot only: 46 ethylene ripening chambers set up by the Punjab Mandi Board (FSSAI).
Verified figures (the number is in the quoted sentence and the sentence is on the source page):
- displacement — A pilot facility with 46 ethylene gas-based ripening chambers with a capacity of 460 metric tonnes was established in Punjab, India, to replace calcium carbide. (Punjab, India, 2018; government or intergovernmental: fssai.gov.in)
- displacement — A pilot facility with 46 ethylene gas-based ripening chambers with a capacity of 460 metric tonnes was established by the Punjab Mandi Board, and private entrepreneurs added 825 metric tonnes of capacity in Punjab. (Punjab, India, 2018; government or intergovernmental: fssai.gov.in)
Suppliers — real products and services (from the vendor index)#
Honest finding: the vendor index has no ethylene-ripening equipment or service supplier. This is recorded as a supplier gap.
Companies below are active vendors in the vendor index whose own card (profile / official website) shows this product or service — matched 2026-10-05 by keyword and checked by hand against the card text. Being listed is not an endorsement; open each card for evidence, contacts and status.
Update 2026-10-05: the new Europe dataset supplies this product — rows marked Europe below. For the other regions the gap noted above still stands unless a row says otherwise.
| Company | Region · Country | What the index shows | Card |
|---|---|---|---|
| Restrain | Europe · United Kingdom | ethanol-to-ethylene generators, incl. tomato ripening | card |
Government funding signals#
Public grants for a specific technology are a leading indicator: governments fund what regulators want to replace and what is close to practical adoption. Searched on 2026-09-27 in: EU CORDIS (FP7, Horizon 2020, Horizon Europe), US federal awards (USAspending: USDA NIFA/ARS/APHIS/Forest Service, EPA, DOE, NOAA, USAID; plus NSF and NIH), UK UKRI Gateway to Research, Australian Research Council. Each grant below was reviewed by hand for relevance. China, Brazil and India are covered in the subsection below (publication-acknowledged grants). Not covered: Russia (RSF, FASIE — not reachable from the research environment) and national agencies outside these databases. Amounts are the funder’s contribution as recorded (US NIH/UKRI: per award or fiscal year).
Signal: Moderate. 2 relevant grant(s) · about €2.5M in total · jurisdictions: EU.
| Funder / programme | Project | Lead organisation | Start | Amount | Link |
|---|---|---|---|---|---|
| European Commission — H2020 SME-2 | Safer ACC: ACC – An efficient harmless Plant Growth Regulator for fruit/vegetables RIPENING | Just Global Communication & International Mar (ES) | 2018 | 1,508,489 EUR | link |
| European Commission — FP7 CP-TP | SMART-RIPE: New ripening room monitoring technology for improving the efficiency and sustainability of cheese ripening processes | Iris Technology Solutions, Sociedad Limitada (ES) | 2013 | 1,000,621 EUR | link |
China, Brazil, India — national research grants acknowledged in publications#
Chinese, Brazilian and Indian funders have no open grant databases reachable here, so this measures scientific papers published since 2015 that acknowledge national government grants, taken from the grant numbers publishers deposit with Crossref. Only papers whose title contains this article’s key terms are counted (a conservative lower bound; “100+” = search window full). It shows research-funding intensity, not budgets. Funders: China — NSFC, National Key R&D Program, China Agriculture Research System; Brazil — CNPq, CAPES, FAPESP, Embrapa, FAPEMIG; India — DBT, DST, ICAR, SERB, CSIR, BIRAC. Rating per country: Strong ≥50 papers · Moderate 10–49 · Weak 1–9.
| Country | Papers funded (2015–2026) | Signal | Main funders (grant acknowledgements) | Example grant → funded paper |
|---|---|---|---|---|
| China | 144+ | Strong | NSFC (177), National Key R&D Program (32), China Agriculture Research System (9) | NSFC 31672121 → *The Jasmonate-Activated Transcription Factor MdMYC2 Regulates |
| ETHYLENE RESPONSE…* (2017) doi | ||||
| Brazil | 4 | Weak | CNPq (4), FAPESP (3), CAPES (1) | FAPESP 2013/18056-2 → Light, Ethylene and Auxin Signaling Interaction Regulates Carotenoid Biosynthesis During Tomato Fruit… (2018) doi |
| India | 2 | Weak | DBT (2), DST (1) | DBT BT/RLF/Re-entry/20/2017 → Colorimetric sensing of calcium carbide over banana peels using 5,5′-dithiobis-(2-nitrobenzoic acid)… (2023) doi |
Scientific evidence#
- Saltveit ME (1999). Effect of ethylene on quality of fresh fruits and vegetables. Postharvest Biology and Technology 15: 279–292.
- FSSAI (Food Safety and Standards Authority of India). Food Safety and Standards (Prohibition and Restrictions on Sales) Regulations, 2011: prohibition of the use of calcium carbide for ripening fruits; FSSAI guidance on artificial ripening of fruits with ethylene gas.
Bioeconomy value#
A natural plant hormone that can be made from renewable bio-ethanol replaces an arsenic-contaminated industrial chemical, improving food safety and fruit value for smallholders.