Central to this research is the fungus known as Trametes versicolor, commonly referred to as the “turkey tail.” Unlike the more conspicuous mushroom cap that we see above the ground, fungi like T. versicolor possess a vast underground network called mycelium, composed of fine, thread-like structures known as hyphae. These mycelial networks already possess inherent water-repelling properties. By harnessing these characteristics, the researchers aimed to cultivate a food-safe, sustainable coating that adheres to and protects various substrates effectively.

The approach involved blending mycelia from T. versicolor with cellulose nanofibrils (CNFs) — ultrafine fibers derived from wood pulp known for their strength and barrier properties. CNFs are increasingly utilized in material science due to their biodegradability and capacity to form dense networks impermeable to gases and liquids. The process began by immersing materials such as denim fabric, polyester felt, birch veneer, and paper in a nutrient solution containing the fungal spores and CNFs. Over several days, the fungal mycelium grew a sustained layer on these substrates.

What makes this fungal coating remarkable is its minimal thickness, comparable to a layer of paint, which forms after just a few days of fungal growth. The researchers observed that after a 3-4 day incubation period in controlled warm environments, the coating demonstrated significant hydrophobicity. When water droplets were placed on treated surfaces, they formed spheres, indicating the liquid was repelled rather than absorbed. This phenomenon contrasts starkly with untreated materials where water either spread out thinly or was immediately soaked in.

In addition to water resistance, the composite film exhibited barriers against a suite of other challenging liquids including n-heptane, toluene, and castor oil. This suggests that the fungal coatings can withstand a broad spectrum of chemical exposures, broadening their application potential beyond just food packaging. Importantly, once the film had developed, the samples underwent a heat treatment in an oven for one day. This process inactivated the fungus, ensuring the coating was stable and no longer biologically active, while also enabling the film to dry and solidify.

The aesthetic changes induced by the mycelium were notable: the coatings imparted a mottled pattern with hues ranging from yellow and orange to tan. While these visual traits might limit some applications requiring uniform appearances, they allow a distinctive, natural look appealing to sustainable product lines emphasizing eco-conscious branding.

The underlying science harnesses the complex properties of mycelial networks combined with wood-derived cellulose nanofibrils. Mycelium contributes the natural water-repellent chemistry and structural intricacy, while CNFs provide mechanical strength and enhance the film’s impermeability to oils and oxygen. This combination leads to coatings that are not only sustainable but also functionally competitive with conventional synthetic polymers used today.

This innovation arrives at a critical juncture when global awareness about the environmental damage wrought by plastics is at an all-time high. Conventional plastic coatings contribute heavily to landfill mass and marine pollution, issues that are difficult to mitigate given their persistence and toxicity. The fungal coating technology, developed using edible and food-safe fungi, offers a biodegradable solution that could integrate into existing manufacturing processes without the need for toxic chemicals or complex synthetic modifications.

Though still at a proof-of-concept stage, the implications for industrial scaling are promising. The basic ingredients—fungal spores, cellulose fibers, and common textiles or papers—are widely accessible. Further research will focus on optimizing growth conditions, improving uniformity, and expanding the durability of the coatings under real-world wear and tear. Additionally, the exploration of other fungal species and nanomaterials may unlock coatings with tailored properties for specialized applications, from luxury textiles to food-grade packaging.

Beyond packaging, this technology intersects with the broader field of biofabrication, where living organisms and their products are engineered to create materials with superior environmental and mechanical properties. Mycelium-based products have recently garnered interest not just for water resistance, but also as biodegradable alternatives in leather-like fabrics, insulation panels, and even as sound absorbers.

Fundamentally, this research underscores nature’s capacity to offer “elegant, sustainable solutions” to pressing material science challenges. As Caitlin Howell eloquently puts it, leveraging the properties of fungi and cellulose nanofibrils could significantly reduce our environmental footprint. By replacing plastic coatings on ubiquitous consumer goods, fungal films might diminish pollution at its source, fostering a future where industrial materials align harmoniously with ecological cycles.

In summary, the creation of edible fungal mycelium coatings demonstrates a novel and practical step forward in the quest for sustainable, biodegradable barriers capable of resisting water, grease, and oils. This aligns well with global sustainability goals and consumer demand for green alternatives. The study characterizes how fungal biology integrated with nanocellulose technology forms functional coatings with minimal environmental impact. As research advances, these naturally derived coatings are poised to disrupt markets reliant on single-use plastics and synthetic polymers, signifying a major stride toward a greener chemical future.

Subject of Research: Sustainable barrier coatings using edible fungal mycelia and cellulose nanofibrils to replace single-use plastic coatings.

Article Title: Growing Sustainable Barrier Coatings from Edible Fungal Mycelia

News Publication Date: 26-Sep-2025

Web References:
https://dx.doi.org/10.1021/acs.langmuir.5c03185

References:
Howell, C., et al. “Growing Sustainable Barrier Coatings from Edible Fungal Mycelia.” Langmuir, 2025. DOI: 10.1021/acs.langmuir.5c03185.

Image Credits: Adapted from Langmuir 2025, DOI: 10.1021/acs.langmuir.5c03185

Keywords:
Chemistry, Sustainability, Natural resources management, Applied ecology

The study, recently published in the Journal of Bioresources and Bioproducts, meticulously details a novel protocol leveraging electrostatic adsorption and discontinuous membrane formation on the fiber surface. The core of this technology involves an initial treatment of lyocell fibers with a cationic modifier (CM). This step alters the surface charge characteristics, thereby enabling the subsequent application of anionic polyacrylic acid emulsions (AEs), which interact through electrostatic forces. The result is the formation of a discontinuous protective film encapsulating the fiber surface, a strategic barrier that inhibits water infiltration and reinforces cohesion between microfibrils under wet conditions.

Such an electrostatic assembly imparts exceptional anti-fibrillation capabilities to lyocell textiles. Experimental washing cycles reveal a significant reduction in the generation of fibrils, thereby suppressing the pilling and preserving the fabric’s smooth aesthetic. Unlike some traditional treatments that compromise the fabric’s hand feel or mechanical integrity, this method maintains the inherent strength and whiteness of the fibers. Remarkably, it also enhances several functional parameters, including a 46.4% increase in air permeability, which can be directly correlated with improved breathability—a highly sought-after characteristic in modern fashion and technical textiles.

Beyond durability and breathability enhancements, the treatment was found to markedly improve the dyeability of lyocell fabric. The anionic polyacrylic acid emulsion layer harmonizes with various dyes, resulting in richer coloration and elevated glossiness without introducing chemical harshness or toxicity. This multifaceted improvement addresses longstanding challenges in textile manufacturing, where eco-friendly fibers like lyocell often compete with synthetic alternatives boasting superior dye retention and luster. The newly introduced surface modification technique thus bridges a critical gap between sustainability and performance.

Abrasion tests conducted on the treated fabric further confirm its robustness. Both wet and dry rub resistance exceeded standard benchmarks, suggesting that treated lyocell textiles can withstand the mechanical stresses typical in everyday wear and home laundering. This property extends the usable life of garments and textile products, thereby reducing waste and contributing to the circular economy. Since sustainability remains at the forefront of consumer and regulatory demands, such innovations could catalyze a shift toward wider adoption of cellulose-based fibers in sectors hitherto dominated by petrochemical-derived fabrics.

Importantly, the researchers underscore the green credentials of the method itself. The treatment avoids harsh chemical agents and employs water-based emulsions, aligning with principles of green chemistry and minimal environmental impact. Optimization of treatment parameters—namely AE concentration, curing temperature, and curing duration—proved crucial in achieving balanced enhancements without over-processing the delicate lyocell fibers. This meticulous calibration protects the fiber’s inherent biodegradability and maintains its soft hand feel, critical attributes for market acceptance.

The implications of this research extend far beyond mere textile finishing. By demonstrating that electrostatic adsorption can effectively create protective, multifunctional membrane layers on natural fibers, this approach lays groundwork for next-generation functional textiles. Potential applications include antimicrobial finishes, UV protection coatings, and smart textile integrations, all leveraging the same fundamental principles. The ability to tune the surface chemistry of cellulose fibers opens myriad possibilities for bespoke fabric properties tailored to specific end-use requirements.

From an industrial perspective, scalability and cost-effectiveness are pivotal for technology adoption. The researchers report that their method is compatible with existing textile processing infrastructures, requiring only modest adjustments to conventional treatment lines. The aqueous nature of the process also reduces dependency on solvents, cutting operational expenses and limiting worker exposure to harmful chemicals. This positions the technology as a viable candidate for commercial uptake in textile manufacturing hubs, promising not only enhanced product quality but also improved workplace safety and environmental sustainability.

Furthermore, the enhanced durability and multifunctionality of treated lyocell fabric herald opportunities in healthcare textiles, an emerging field where fabric hygiene, comfort, and longevity are of paramount importance. Treated lyocell could be developed into superior wound dressings, surgical gowns, and bedding materials that combine high breathability with resistance to microbial colonization and mechanical degradation. This could lead to better patient outcomes and reduce hospital-associated textile waste.

In a broader context, this study exemplifies the power of interdisciplinary collaboration between textile science, polymer chemistry, and material engineering. It highlights how fundamental knowledge of electrostatic interactions and polymer film formation can be ingeniously applied to practical challenges faced by the textile industry. The research sets a precedent for future innovations aimed at reconciling ecological responsibility with product performance, a crucial endeavor as sustainable development goals become embedded across industrial sectors.

In summary, the novel treatment method developed by Qingdao University researchers represents a significant leap forward in lyocell fabric technology. Through electrostatic adsorption and the formation of a discontinuous polymer membrane, they have substantially mitigated the chronic issue of fibrillation while simultaneously boosting air permeability, dyeability, abrasion resistance, and glossiness. This multifunctional enhancement strategy unlocks new commercial avenues for lyocell, supporting the broader transition toward sustainable, high-performance textiles that meet contemporary consumer and environmental expectations.

Continued research and development will focus on fine-tuning the process for various fabric types and scales of production, alongside exploring additional functional upgrades such as antimicrobial effects and moisture management. With global textile industries under mounting pressure to adopt sustainable practices without sacrificing quality, innovations like this offer compelling solutions that marry science with market needs, promising to redefine the future landscape of cellulose-based textiles.

Subject of Research: Not applicable

Article Title: Sustainable Anti-Fibrillation and Multifunction Enhancement of Lyocell Fabric via Electrostatic Adsorption and Discontinuous Membrane Formation

News Publication Date: 11-May-2025

Web References:
https://doi.org/10.1016/j.jobab.2025.05.003
https://www.sciencedirect.com/journal/journal-of-bioresources-and-bioproducts

References: 10.1016/j.jobab.2025.05.003

Image Credits: Shandong Key Laboratory of Medical and Health Textile Materials, College of Textiles & Clothing, Qingdao University, Qingdao, China

Keywords: Materials science, Technology, Agriculture, Engineering, Plant sciences, Biochemistry