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The science behind the viral “salt injected into wood” claim is real, but that description is misleading. A 2025 study by researchers at RIKEN and the University of Tokyo reports a cellulose-based plastic assembled from modified cellulose and an ionic polymer, with choline chloride added to improve flexibility. The team demonstrated a flexible bag, seawater-triggered dissociation and electrolyte-based closed-loop recycling in the laboratory—not a finished replacement for all plastics.
What the headline gets wrong
The researchers did not inject table salt into a piece of intact wood and turn it into plastic. Their paper describes a cellulose-based supramolecular plastic made through a chemical process. Cellulose is a plant-derived material, but the final formulation also includes a hyperbranched polyguanidinium ion; it is not simply wood and salt.
The study, “Supramolecular Ionic Polymerization: Cellulose-Based Supramolecular Plastics with Broadly Tunable Mechanical Properties,” was published online in the Journal of the American Chemical Society on November 19, 2025. Read the paper.
- Real research? Yes.
- Wood literally injected with ordinary salt? No.
- A “perfect” plastic or proven solution to plastic pollution? No.
- Seawater dissociation demonstrated? Yes, under the study’s conditions.
- Commercial product established? No.
What the researchers actually made
The material is a cellulose-based supramolecular plastic. Its main components are carboxymethyl cellulose (CMC), a chemically modified cellulose derivative, and a hyperbranched polyguanidinium ion, which supplies the positively charged counterpart in the material’s ionic network. The paper calls the base material CMCSP and the choline-chloride-plasticized version CMCSPChCl.
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In this context, “supramolecular” describes a structure assembled through reversible interactions, especially ionic ones, rather than relying only on permanent chemical cross-links. Reversible interactions can help a material hold together during use yet come apart under selected conditions. That does not mean it automatically disappears in every environment.
Why choline chloride matters
The unplasticized material was strong but brittle. The researchers added choline chloride (ChCl)—the salt referred to in simplified headlines—as a plasticizer. It changes the material’s mechanical behavior, allowing properties to be tuned from stiff and glassy toward tougher, more flexible or softer and elastic forms.
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Choline chloride is not the whole recipe and does not simply reinforce wood. The paper describes it as an FDA-approved, biodegradable ionic human nutrient; that description applies to this ingredient, not automatically to the complete plastic or every product made from it. The finished formulation’s safety depends on its full composition, impurities, breakdown products and exposure conditions.
What the laboratory demonstration showed
A flexible bag
The team made a flexible plastic bag, demonstrating one possible film or packaging form. That does not establish suitability for food contact, medical use, bottles, construction products or other applications; each would need its own performance and regulatory testing.
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Dissociation in seawater
The researchers reported that the material could dissociate in seawater. Dissociation means that the assembled material comes apart into constituent components or soluble species. It is not, by itself, proof that the material is completely mineralized by organisms into harmless products in every marine setting. The authors also state that their material does not generate microplastics under the demonstrated approach; that claim should be understood as specific to the tested material and conditions, not as a universal finding for all cellulose plastics.
Electrolyte-based recycling
The paper reports closed-loop recycling using electrolytes. This is a recovery route involving controlled processing, not ordinary curbside recycling. At scale it would require collection, sorting, contamination control, recovery and purification of materials, and a way to manage residual streams.
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Why the approach could matter—and what it does not prove
The design aims to combine useful mechanical properties with an alternative end-of-life pathway. A cellulose-derived feedstock and the prospect of recovering a material rather than leaving persistent fragments are promising research directions. But “plant-based” does not automatically mean low-carbon or sustainable: impacts depend on feedstock sourcing, land use, transport, processing chemicals, water and energy. The paper does not establish a life-cycle advantage over conventional plastics.
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Seawater-triggered dissociation also creates an engineering trade-off. A package must withstand ordinary use, moisture and storage before disposal, while still responding as intended in a recovery process. The study’s reported result does not settle how the material performs in freshwater, soil, landfills, wastewater, repeated wet-dry cycles or long-term outdoor exposure.
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The publication is a laboratory materials demonstration, not evidence of continuous industrial production, cost competitiveness, shelf life, supply-chain readiness or performance parity with polyethylene, polypropylene, PET or multilayer packaging. Nor does a provisional patent application—disclosed by the authors—show that a product is available or commercially ready.
Verdict
This is promising research into a cellulose-based, ionically assembled plastic that can be tuned mechanically and was demonstrated to dissociate in seawater and be recycled with electrolytes. It is not wood transformed by injecting table salt, and the reported results do not yet show that it can replace conventional plastics at commercial scale or biodegrade harmlessly in every environment.
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