The development of jelly ice emerged from a simple but profound observation in grocery store seafood sections, where melting ice pools raised concerns about pathogen spread and food contamination. This practical problem inspired researchers Jiahan Zou and Gang Sun to explore gelatin as the base for a reusable cooling medium that could retain water even through multiple freeze-thaw cycles. Gelatin’s unique molecular composition — long proteins that form a three-dimensional hydrogel network — enables it to trap water molecules tightly within tiny pores. This structural characteristic resists water leakage even when the gel transitions from frozen to liquid states, a critical improvement over typical ice or frozen tofu, which releases water upon thawing.

Gelatin hydrogels, used here as a starting material, possess critical attributes for a practical reusable ice substitute. From a materials science perspective, these gels are physically crosslinked polymeric networks capable of phase transitions without structural collapse. They jellify due to the physical entanglement of protein strands, producing a stable mesh that hosts water uniformly. This uniform encapsulation allows jelly ice to maintain cooling properties based on the latent heat absorbed or released during water’s phase changes, although with an efficiency slightly below that of pure ice. Despite this, the material excels in reusability, microbial resistance, and avoiding contamination, offering up to 80% of the heat absorption capacity of conventional ice.

One of the most significant advantages of jelly ice is its sustainability. Unlike conventional ice packs, which are typically encased in plastic and often discarded after use, jelly ice is fully compostable, breaking down into environmentally benign components. Moreover, it eliminates microplastic pollution risks, a growing concern linked to synthetic cooling gels. The research team reported that composted jelly ice even improves plant growth, suggesting an added circular economy benefit for agricultural waste integration. This eco-conscious design signals an important advancement in the drive to replace synthetic materials with bio-based, biodegradable alternatives that do not contribute to long-term pollution.

Beyond basic applications, jelly ice shows promise in specialized contexts where traditional ice is suboptimal or unavailable. Medical and biotechnological industries, for example, require reliable cool storage solutions that maintain sterile conditions and prevent moisture contamination. Jelly ice’s ability to withstand repeated freeze-thaw cycles and resist microbial proliferation makes it ideal for shipping sensitive pharmaceuticals and biological samples. Additionally, its moldability and customizable shapes allow tailoring for diverse containers and packaging sizes, markedly improving logistic flexibility compared to rigid ice blocks or bulky gel packs.

The underlying fabrication method for jelly ice emphasizes efficiency and scalability. Employing a streamlined one-step synthesis, the production process involves hydrating gelatin polymers with water and subjecting the mixture to controlled cooling, which prompts gel formation. This approach not only simplifies manufacturing but also allows easy adjustment of the material’s physical properties, such as stiffness and freezing point, by altering gelatin concentration or adding safe additives. Such tunability sets the stage for widespread adoption across industries with differing cooling requirements.

The conceptual origin of jelly ice traces back to the behavior of frozen tofu, a material known for entrapping water in a porous matrix. However, unlike tofu, which releases water upon thawing due to its structural breakdown, gelatin’s hydrogel maintains its structural fidelity and prevents leakage. This biological inspiration highlights the power of leveraging natural materials and mechanisms to meet engineering challenges — a principle increasingly embraced in sustainable materials science. The researchers’ success with gelatin hydrogels paves the way for exploring other biopolymers with similar properties for future innovations.

While jelly ice represents a notable breakthrough, market integration still lies ahead. Researchers acknowledge that comprehensive market analyses, product design refinements, and large-scale production validations will be necessary before jelly ice becomes a commercially available consumer product. The technology is licensed, suggesting active interest from industry stakeholders eager to capitalize on its sustainability advantages. If successfully commercialized, jelly ice could disrupt standard practices in food retail, cold chain logistics, and even everyday consumer use, offering a mess-free and eco-friendly cooling experience.

Importantly, the researchers are extending their work into developing protein-based coatings and scaffolds derived from plant proteins, such as soy, which hold potential for cultivating meat and other cellular agriculture applications. These efforts aim to broaden the suite of bio-derived polymeric materials contributing to a circular bioeconomy by valorizing agricultural byproducts and reducing reliance on petrochemical plastics. Advances in ultrasonic and chemical processing techniques have improved the processability of such plant proteins, opening exciting avenues in food safety and sustainability-focused materials science.

Zou, a lead investigator, emphasizes the power and versatility of natural biopolymers in crafting next-generation materials. Her research shows that mimicking nature’s design principles can yield functional materials with desirable mechanical, thermal, and environmental properties suited for food security and safety. This approach aligns well with the global imperative to innovate sustainable alternatives that balance performance with ecological responsibility, reflecting a growing recognition that future material solutions must be inherently regenerative.

Presented at the prestigious American Chemical Society’s Fall 2025 meeting, this research attracted attention for its interdisciplinary impact — bridging chemistry, materials science, food technology, and environmental sustainability. The jelly ice innovation exemplifies the transformative potential inherent in bio-based functional materials to address major societal challenges such as food waste, plastic pollution, and pathogen contamination. As the scientific community advances these innovations, the commercial ecosystem will likely witness an expansion of green materials replacing conventional synthetic solutions.

Ultimately, jelly ice is more than just a clever substitute for melting ice; it represents a step toward circular, regenerative materials that support sustainable food systems and cold chain logistics worldwide. Future developments may see the technology integrated into diverse applications—from everyday grocery displays and home use to critical medical shipments and cellular agriculture. This versatile biomaterial, derived from a simple yet powerful natural polymer, exemplifies the promise of biopolymer science in harmonizing technological progress with environmental stewardship.

Subject of Research: Sustainable bio-derived polymeric materials improving food security, food safety, and circular bioeconomy

Article Title: Sustainable bio-derived polymeric materials improving food security, food safety, and circular bioeconomy

News Publication Date: August 18, 2025

Web References:
https://acs.digitellinc.com/live/35/page/1204
https://acs.digitellinc.com/live/35/session/560625
https://youtu.be/qXofDLPriwg

Image Credits: UC Davis

Keywords

Chemistry, Materials, Food safety

At the forefront of this research is Professor Young-Shin Jun, a leading figure in energy, environmental, and chemical engineering, who, alongside doctoral candidate Minkyoung Jung, has engineered innovative mineral-hydrogel composites designed to sequester ammonium and phosphate—two key nutrient culprits responsible for eutrophication and harmful algal blooms. Embedded within these hydrogels are nanoscale mineral seeds of struvite and calcium phosphate. These seeds operate at the molecular level, binding and precipitating dissolved nutrients with remarkable efficiency, reducing ammonia concentrations by up to 60 percent and phosphate concentrations by as much as 91 percent in treated wastewater samples. By achieving these reductions, the composites substantially inhibit algal proliferation and the subsequent release of dangerous toxins commonly linked to ecological and public health crises.

The economic stakes of nutrient pollution are staggering. A 2000 report by the U.S. National Oceanic and Atmospheric Administration estimated that harmful algal blooms alone inflict annual economic damages in U.S. coastal waters ranging from $33.9 million to $81.6 million. These financial losses span commercial fisheries decimated by hypoxic zones, tourism declines due to unsightly and hazardous water conditions, and increased costs in water treatment infrastructure. The new composite nanotechnology positions itself not merely as a pollution mitigator but as a catalyst for circular economy principles—transforming problematic waste streams into marketable, value-added products.

Published online on May 29 in a thematic issue of Environmental Science & Technology titled “Advancing a Circular Economy,” Jun and Jung’s work highlights the intersection of cutting-edge materials science and environmental engineering. Their hydrogel composites emulate nature’s ability to absorb moisture—akin to the polymers found in disposable diapers—but are reimagined to selectively capture troublesome nutrients from aqueous environments. This choice of hydrogel matrices allows for high affinity and capacity for nutrient uptake while maintaining a robust structural framework critical for practical deployment in wastewater treatment contexts.

The technical core of this innovation lies in nanoparticle nucleation facilitated within the hydrogel. This process initiates the transition of dissolved nutrient ions from a liquid phase into solid mineral forms. The researchers specifically synthesized ultra-fine mineral seeds of calcium phosphate and struvite within the hydrogels. Struvite, a crystalline compound composed of magnesium, ammonium, and phosphate ions, plays a pivotal role by serving as nucleation sites that capture free ammonia and phosphate ions, leading to their co-precipitation and sequestration. As a result, the hydrogel’s particle size swells from an average diameter of 6.12 nanometers to approximately 14.8 nanometers, visibly confirming nutrient incorporation.

Conventional nutrient removal technologies face three formidable challenges: the difficulty in efficiently collecting both ammonium and phosphate simultaneously, maintaining high removal efficiencies despite fluctuating water chemistries, and achieving practical scalability. Jun’s composite nanotechnology advances beyond these constraints by providing a single-material system capable of addressing multiple nutrient pollutants with consistent performance. Its efficacy across diverse wastewater conditions underscores its real-world adaptability, crucial for meeting the varying chemical and biological demands of municipal and industrial effluents.

Scalability is a decisive factor transforming laboratory discoveries into field-ready solutions. Jun’s team reports successful trials treating volumes up to 20 liters, a significant increase compared to bench-scale experiments typically confined to milliliter quantities. The group is actively scaling up to treat 200 liters, moving closer to pilot studies or municipal demonstration projects. Such progress signals the material’s promise to transition from proof-of-concept to widespread, practical utility, potentially reshaping wastewater treatment paradigms worldwide.

Environmental implications of this technology extend beyond nutrient removal. By recovering phosphorus—a finite, non-renewable resource critical for global food security—and ammonia, whose industrial synthesis is energy-intensive, the hydrogel composites embody principles of sustainability and resource circularity. This dual benefit reduces reliance on virgin mineral fertilizers while cutting greenhouse gas emissions associated with fertilizer production, positioning the technology at the nexus of climate change mitigation and environmental restoration.

The multidisciplinary approach of the research team exemplifies modern environmental engineering paradigms, blending chemistry, materials science, and ecological awareness. Their strategy demonstrates how biomimicry—taking cues from natural absorbent materials and mineral crystal formation—can yield innovative solutions to persistent environmental problems. Furthermore, the team’s collaboration with WashU’s Office of Technology Management to secure patents for the mineral hydrogel technology reflects a commitment to transforming academic insights into impactful, commercializable technologies.

By converting wastewater nutrients from liabilities into assets, this composite nanotechnology offers a compelling blueprint for sustainable wastewater management. The process captures the imagination by not only safeguarding aquatic ecosystems from eutrophication but also enabling the reuse of extracted nutrients as fertilizers that feed crops or as feedstocks in biorefineries producing biofuels and biochemicals, thus closing the loop in nutrient cycles.

Looking forward, widespread adoption of mineral-hydrogel composites could alleviate the burden on conventional water treatment plants, reduce eutrophication risks in vulnerable water bodies, and open novel agricultural markets reliant on sustainable fertilizer sources. Continuation of scale-up studies, life-cycle assessments, and integration with existing infrastructure will be crucial next steps toward commercialization and impact realization.

In sum, the research from Washington University in St. Louis delineates a transformative path from pollution abatement to resource regeneration. This leap in wastewater treatment technology underscores the power of nanomaterials and hydrogel composites to tackle the dual challenges of environmental degradation and resource scarcity—ushering in a new era where wastewater becomes a source of wealth, health, and ecological resilience.

Subject of Research: Novel mineral-hydrogel composites for simultaneous removal and recovery of ammonia and phosphate from wastewater.

Article Title: Molecular insights into novel struvite-hydrogel composites for simultaneous ammonia and phosphate removal.

News Publication Date: May 29, 2024

References:
Jung M, Wang Y, Ilavsky J, Tang Y, Jun Y-S. Molecular insights into novel struvite-hydrogel composites for simultaneous ammonia and phosphate removal. Environmental Science & Technology, online May 29, 2024.

Keywords: Industrial science, Wastewater, Mineralogy, Water supply, Hydrogels