CO₂ Tail Gas Cultivates Lycopene

Qingdao Xihai Bio Launches First Biological Mass Production on August 6, Using Coal Chemical/Steel Plant CO₂ as Carbon Source with Engineered Bacterial Fermentation, Cutting Costs ~90% vs. Traditional Extraction, Achieving Pilot-Scale Production from Industrial Exhaust to Food-Grade Carotenoid.

♻️Why This Matters

Lycopene is the strongest antioxidant among carotenoids and a high-value red pigment in the natural colorant market:

• Traditional plant extraction: Extracted from tomato pomace or processing waste. One ton of high-purity lycopene costs 8–12 million RMB, heavily dependent on growing seasons, origin, and raw material price volatility.
• Traditional chemical synthesis: Lower cost, but involves long reaction routes, organic solvent residues, and intermediate byproducts. It cannot be labeled "natural" under EU/US clean-label standards and faces restrictions in China's health food registration.
• Existing microbial fermentation​ (yeast/filamentous fungi): Mostly still uses glucose/starch as carbon source — no departure from "grain-for-pigment" model, and carbon footprint remains significant.

Xihai Bio's differentiator: Directly using industrial exhaust CO₂ as the sole primary carbon source + photosynthetic bacteria for carbon fixation + synthetic biology strain engineering, merging "carbon fixation" and "natural pigment production" into one process, and successfully scaling up to a 10-ton pilot line.

⚗️Full Technical Route

Chassis strain: Rhodopseudomonas palustris (purple non‑sulfur photosynthetic bacterium). Chosen because it naturally fixes CO₂ photosynthetically, utilizes small organic acids, and already possesses an endogenous carotenoid pathway.

Carbon input:

• Primary carbon source: CO₂​ from coal chemical plants, steel mills, petrochemical facilities, or thermal power plants (after dust removal and desulfurization, fed directly into fermenters).
• Co‑carbon sources: Biodiesel byproduct glycerol, lignin degradation liquor, even seawater at 4.5% salinity (using salt-tolerant strain RPAS-11) to supplement reducing power and trace elements.

Synthetic biology modifications​ (accumulated over ~10 years by Prof. Yang Jianming's team at Qingdao Agricultural University):

1. Adaptive evolution + random mutagenesis + large-scale screening to obtain high‑efficiency CO₂‑fixing wild strains.
2. Gene editing to knock out or weaken competing pathways (e.g., blocking lycopene cyclization via crtC disruption).
3. Overexpression of the lycopene biosynthesis gene cluster (crtE/crtB/crtI) with optimized promoters and RBS.
4. Membrane engineering to improve CO₂ transmembrane transport and light‑harvesting efficiency.
5. Metabolic flux redistribution to channel carbon flow and reducing power toward the terpenoid pathway.

Final performance: The engineered strain accumulates lycopene at ~30% of cell dry weight. After fermentation, green extraction (avoiding organic solvents) yields a product that can be labeled "fermentation‑derived natural lycopene."

💰Why ~90% Cost Reduction?

Public data: Traditional high‑purity lycopene market price 5–7 million RMB/ton; Xihai Bio's synthetic biology route brings comprehensive manufacturing cost down to ~0.5 million RMB/ton level​ — roughly 90% reduction.

The savings come from three stacked factors:

• Near‑zero raw material cost: CO₂ is a waste gas that steel/power plants pay to treat. In some scenarios, carbon credit revenue can even offset costs (a medium‑sized thermal plant emitting 150,000 tons CO₂/year, fixing 60%, could generate ~10 million RMB in carbon credits annually).
• No need to grow tomatoes: Eliminates thousands of acres of farmland, harvesting, transportation, and preprocessing of tomato skins/seeds.
• High fermentation density + high purity: 30% dry‑weight product ratio shortens downstream extraction steps, reduces losses, and delivers batch‑to‑batch purity superior to plant extracts.

⏳Industrialization Timeline

• ~2016: Prof. Yang Jianming returned from a postdoc at University of Washington and set the direction: "produce lycopene via photosynthetic carbon fixation without grain."
• 2024: Qingdao Agricultural University contributed 10 patents as equity, co‑founding Qingdao Xihai Biotechnology Co., Ltd.​ with Xihai Venture Capital, located at the Qingdao High‑tech Zone Marine Science & Technology Market Base.
• Pilot phase: Successive scale‑up from 100 L → 1 ton fermenters over two years, iterating strain, high‑density fermentation, and green extraction.
• 2026‑08‑06: Qingdao High‑tech Zone hosted the "Green Biomanufacturing Lycopene Industrialization Seminar & Launch Ceremony." First batch of products rolled off the 10‑ton pilot production line. On‑site sales intent agreements signed with Fusen Bio, Aike Bio, and Maite Kodiya.
• Positioning: Not a mega‑tonnage chemical plant, but a demonstration pilot‑scale line​ proving that "industrial exhaust CO₂ → high‑value food ingredient" is technically and economically viable.

🎨Impact on the Natural Pigment Industry

1. Red pigment supply restructuring: Lycopene, canthaxanthin, and astaxanthin belong to the same carotenoid family. The same photosynthetic CO₂‑fixation platform can be shifted to produce astaxanthin or bacterioruberin. Future red‑to‑orange natural pigments won't rely solely on tomatoes, peppers, or Haematococcus pluvialis.
2. "Carbon‑negative pigment" as a new selling point: Under EU Farm to Fork, US clean‑label trends, and China's dual‑carbon procurement policies, "CO₂‑fixed natural pigment" carries an ESG premium over ordinary fermented pigments.
3. Factory‑near‑emitter logic: Steel mills and coal chemical parks in Shandong, Hebei, Inner Mongolia are ideal locations — CO₂ piped directly to bioreactors, reversing the logistics advantage away from southern extraction plants.
4. Regulatory clarity needed: Domestically, fermentation‑derived lycopene falls under either "Food Additive – Lycopene (Fermentation Method)" or "Health Food Raw Material." Whether it can be labeled as "natural lycopene" per GB 2760, and what limits apply to residual sulfides from CO₂ sources, require further clarification from the National Health Commission and Standardization Administration.

🚩One‑Sentence Takeaway

Xihai Bio's August 6 launch is not just "another fermentation pigment factory coming online" — it is China's first fully integrated demonstration line that takes coal chemical/steel plant CO₂ exhaust → photosynthetic bacterial carbon fixation → synthetic biology‑enhanced strain → 10‑ton pilot‑scale natural lycopene production. The ~90% cost cut relies on near‑free carbon feedstock plus 30% dry‑weight product accumulation. The next watchpoints are continuous batch stability of the 10‑ton line and food‑grade customer filing progress.