In a world increasingly dependent on global food supply chains, the journey fruits and vegetables undertake from farm to table is longer and more complex than ever. Exotic produce like avocados from Chile, bananas from Costa Rica, or tomatoes from southern Spain must endure days, sometimes weeks, of transportation. In this prolonged transit, a natural plant hormone, ethylene, plays a hidden but decisive role in the spoilage and quality degradation of these perishable goods. Ethylene, a gaseous hydrocarbon naturally produced by fruits and vegetables, acts as a ripening agent, accelerating the aging process and, when trapped in shipping containers or plastic packaging, can lead to premature overripening and extensive waste. Today, a groundbreaking study led by the University of Copenhagen reveals an innovative approach to controlling ethylene buildup using a simple, abundant natural material: clay.
Ethylene’s impact on postharvest losses has long been recognized as a critical challenge in agricultural logistics. The gas is produced by numerous fruits and vegetables as part of their natural ripening cycle; however, once trapped in enclosed environments, such as shipping containers or plastic packaging, ethylene concentrations increase exponentially. This accumulation speeds up the ripening beyond the optimal point, often causing items to rot before reaching consumers. Traditional methods to manage ethylene involve refrigeration or specialized chemicals, but these can be costly, environmentally unfriendly, or impractical for widespread application.
The recently published research explores the potential of montmorillonite, a naturally occurring clay mineral prevalent worldwide, due to its nontoxic nature and unique structural properties. Montmorillonite is part of the smectite group of clays, characterized by its layered structure and significant surface area, making it an excellent candidate for gas adsorption applications. Led by Associate Professor Heloisa Bordallo and her team at the Niels Bohr Institute, the study combines advanced techniques in physics and chemistry to chemically modify this clay to increase its capacity to capture and retain ethylene effectively.
Initial trials involved using natural clay to absorb ethylene molecules, which resulted in modest adsorption. Recognizing the need to enhance the clay’s porosity and adsorption potential, the researchers applied mild chemical treatments to expand the voids within its layered structure. These modifications increased the surface area available for ethylene binding and improved retention times. Importantly, the treatment preserved the clay’s safety profile, ensuring that it remained nontoxic and suitable for potential use in food packaging.
Sophisticated analytical methods underpin this research’s rigor and novelty. Among these techniques are neutron scattering and X-ray diffraction, which allowed the team to probe the interlayer spacing within the clay and understand precisely how the ethylene molecules interacted at an atomic scale. Thermal analysis was also employed to characterize the material’s behavior under varying temperature conditions. This systematic investigation not only confirmed that modified clay can uptake significantly more ethylene but also elucidated the fundamental interplay between the clay’s surface chemistry and confinement effects responsible for gas capture.
This breakthrough opens new avenues to design sustainable, efficient technologies for food preservation. The concept envisioned by the researchers involves incorporating small pouches or pads filled with the functionalized clay into fruit and vegetable packaging. These “degasser” packets would absorb ethylene continuously throughout transit and storage, similar to moisture-absorbing silica gel packets used to protect electronics. This approach could dramatically extend the shelf life of produce, reduce spoilage rates, and mitigate a significant source of global food waste.
Besides reducing waste, the technology promises to preserve or even enhance the sensory qualities of fruits. Currently, many fruits are harvested prematurely to minimize ripening during transport, leading to flavor and aroma deficits. By controlling ethylene levels, it may become feasible to harvest produce later in the maturation process, allowing fruits to develop fuller taste profiles naturally. Ultimately, consumers would benefit from fresher, tastier produce while the environmental footprint of food transport diminishes.
The researchers emphasize that the discovery goes beyond merely capturing ethylene in food packaging. The detailed understanding of gas adsorption within modified smectite clays could be translated to other applications where tunable gas capture and retention are critical. This includes various industrial processes, environmental monitoring, and even medical technologies where selective adsorption of gases is desired.
Currently, the team continues to fine-tune the chemical modification procedures to maximize ethylene adsorption efficiency while ensuring environmental sustainability. They are also testing the longevity of the clay’s gas retention to determine how long the modified material remains effective in real-world conditions. Further studies are underway to incorporate the clay into prototype packaging materials, with a view to commercial deployment within the next few years.
The adaptability and abundance of montmorillonite clay add to the economic attractiveness of this solution. As a naturally sourced, inexpensive, and safe mineral, it offers a scalable option for addressing postharvest losses on a global scale. Integrating this innovation into supply chains could substantially impact food security, reduce wasted resources, and offer a practical method to meet the challenges posed by climate change on agriculture.
With food waste accounting for roughly one-third of all produced food and a considerable fraction attributed to premature spoilage driven by ethylene, this new strategy promises tangible benefits across the supply chain. The marriage of material science, analytical chemistry, and agricultural technology in this study underscores the importance of interdisciplinary research in solving complex global problems effectively.
In conclusion, the pioneering work on chemically functionalized clay for ethylene capture represents a paradigm shift in produce preservation technology. Through meticulous probing of molecular interactions and innovative material design, scientists have unlocked a promising, sustainable, and versatile approach to extend the freshness and quality of transported fruits and vegetables. This advancement not only tackles food waste but also elevates the consumer experience by protecting the natural flavors and aromas that are often lost in today’s long-distance food transport systems.
Subject of Research:
Control and reduction of ethylene gas accumulation to extend shelf life and quality of fruits and vegetables during transport using chemically modified montmorillonite clay.
Article Title:
Disentangling interlayer confinement and pore surface adsorption in functionalized smectites for tunable ethylene gas capture
News Publication Date:
25-May-2026
Web References:
https://www.sciencedirect.com/science/article/pii/S2666523926000814?via%3Dihub
http://dx.doi.org/10.1016/j.apsadv.2026.101010
References:
Kovalchuk, K., Michels, L., Gates, W., Martins, M., Greene, G.W., Bordallo, H.N. (2026) “Disentangling interlayer confinement and pore surface adsorption in functionalized smectites for tunable ethylene gas capture.” Applied Surface Science Advances.
Image Credits:
Finn Babbe/Lawrence Berkeley National Laboratory (LBNL)
Keywords
Ethylene gas, food preservation, postharvest loss, fruit ripening, montmorillonite clay, smectite, gas adsorption, chemical modification, sustainable packaging, global food waste, material science, agricultural technology
