The answer, according to the study, is no. In a chicken embryo model of early-life intestinal stress, whole Rubired grape pomace, a grape seed extract, and a grape skin and pulp food coloring each protected the gut in distinct and only partially overlapping ways. The finding matters because the food industry has largely moved away from whole pomace, which consumers accept poorly, toward derivative products such as grape seed extracts and natural food colorings. If the original byproduct and its derivatives are not functionally interchangeable, then upcycling strategies that assume equivalence may be leaving nutritional value on the table—or, conversely, may be concentrating specific benefits in ways the whole material cannot match.

To test this, the researchers turned to a well-established in ovo approach. Chicken embryos develop rapidly and independently inside the egg, which makes them a powerful platform for studying early-life intestinal biology without the confounding variables of maternal influence or post-hatch diet. The team induced intestinal stress using dextran sulfate sodium, or DSS, a chemical that damages the intestinal epithelial barrier and is widely used to model inflammatory stress in the gut. DSS injures the single layer of cells lining the intestine, disrupting the delicate architecture of villi and crypts that the gut depends on for absorption and renewal. Into this stressed environment, the researchers introduced three Rubired (Vitis vinifera) preparations: the whole pomace (RGP), the seed extract (RSEED), and the skin and pulp food coloring (RCOLOR), each evaluated for its capacity to blunt the damage.

The clearest and most consistent result concerned the small intestine. DSS exposure depleted the surface area of the duodenal villi—the finger-like projections that dramatically expand the absorptive surface of the gut—and reduced both the density and the size of goblet cells, the specialized epithelial cells that secrete mucus and form a first line of defense against luminal threats. Remarkably, all three grape preparations restored these losses. Whether delivered as whole pomace, concentrated seed extract, or natural coloring, the grape-derived material helped the embryonic duodenum rebuild its villus architecture and replenish its mucus-producing cell population. This suggests that the core protective activity against small-intestinal damage is broadly shared across the grape byproduct family, likely reflecting phenolic compounds that persist in every fraction of the fruit.

The colon told a more selective story. Here, DSS triggered crypt hyperplasia—an abnormal proliferation of the invaginated glands that house the gut’s stem cell niche—yet only two of the three preparations countered it. The grape seed extract and the skin and pulp food coloring attenuated colonic crypt hyperplasia, while the whole pomace did not. This split is scientifically significant because it indicates that the compounds responsible for protecting the colonic crypt compartment are not evenly distributed across the grape. The seed and the skin and pulp fractions appear to concentrate bioactivity that the whole pomace, with its different composition and perhaps lower effective doses of key phenolics, could not deliver in this model.

At the molecular level, the picture shifted again. The researchers examined zonula occludens-2, or ZO2, a tight junction protein that helps seal the gaps between adjacent epithelial cells and maintain the integrity of the intestinal barrier. DSS exposure dysregulated duodenal ZO2, and here it was the whole pomace and the food coloring—not the seed extract—that restored normal regulation. Tight junction proteins are central to barrier function; when they falter, the gut becomes permeable to antigens and microbes, fueling inflammation. The fact that RGP and RCOLOR normalized ZO2 while RSEED did not demonstrates that the seed extract, despite its colonic benefits, left a gap in barrier-level protection in the duodenum.

The microbiome added yet another dimension of divergence. Only the grape seed extract recovered the relative abundance of Clostridium, a bacterial genus with important roles in the gut ecosystem, including the production of short-chain fatty acids that nourish colonocytes and support immune development. Neither the whole pomace nor the food coloring achieved this microbial recovery. In other words, each of the three grape products excelled at a different facet of intestinal resilience: all three repaired small-intestinal structure, two of three protected colonic crypts, two of three restored tight junction regulation, and only one reshaped the microbiota in the measured direction. No single preparation dominated across every endpoint.

These results carry real implications for how the food industry approaches upcycling. If grape seed extracts and natural colorings are marketed as functional equivalents of the pomace they come from, the new data suggest that assumption is too simple. The bioactivity of grape byproducts is fraction-dependent: processing decisions that concentrate certain phenolics inevitably redistribute others. For product developers, this means the choice between whole pomace, seed extract, and skin-derived coloring is not merely a matter of consumer acceptance or cost—it is a choice about which biological targets, from villus architecture to tight junction integrity to microbial balance, a given ingredient can realistically support. Conversely, the study strengthens the case for pomace itself as a reservoir of value, since it matched or exceeded its derivatives on several endpoints despite being the least refined material.

The study also highlights the value of early-life models. The embryonic and neonatal gut undergoes rapid maturation, and insults during this window can have lasting consequences for barrier function, immune programming, and microbial colonization. By showing that grape-derived phenolics can counteract DSS-induced stress at this vulnerable stage, the Cornell team adds to a growing body of evidence that maternal and early-life nutrition can be leveraged to support gut health from the very beginning of development. The chicken embryo model, with its speed and controllability, allowed the researchers to compare three products side by side across structural, molecular, and microbial endpoints within a single experimental framework.

The authors are careful about the limits of their work. The findings were generated in an avian embryonic model, and the study itself notes that future research in mammalian models and across extended early-life periods is needed to establish translational relevance and mechanistic context. Chicken embryo intestines differ from mammalian ones in ways that could alter how phenolic compounds are absorbed, metabolized, and delivered to target tissues, and the DSS challenge in ovo is a proxy for inflammatory stress rather than a specific human disease. Still, the central conclusion stands on firm ground within its model: grape byproducts hold genuine potential to mitigate early-life intestinal stress, but they do so in distinct ways. As the pressure to halve global food waste intensifies, the humble pile of pressed grapes left behind after each harvest may prove to be not a liability but a differentiated portfolio of bioactive ingredients—provided that science, not assumption, guides which fraction goes where.

Subject of Research: Effects of grape pomace, seed extract, and skin/pulp food coloring on DSS-induced early-life intestinal stress in a chicken embryo model

Article Title: Comparing the bioactivity of grape byproducts (pomace, seed extract, and skin/pulp food coloring) on DSS-induced intestinal stress in early life

Article References: Huang, M. Y., & Tako, E. (2026). Comparing the bioactivity of grape byproducts (pomace, seed extract, and skin/pulp food coloring) on DSS-induced intestinal stress in early life. npj Science of Food. https://doi.org/10.1038/s41538-026-01148-0

Image Credits: AI Generated

DOI: 10.1038/s41538-026-01148-0

Keywords: grape pomace, food waste, upcycling, phenolic compounds, intestinal barrier, dextran sulfate sodium, chicken embryo model, goblet cells, tight junctions, ZO2, gut microbiota, early-life nutrition

The raw materials could hardly be more mundane. Post-consumer PVC pipes were collected from a construction site at the university’s Department of Chemical Engineering in Nakhon Nayok, washed, dried at 30 °C for 48 hours, and ground into roughly one-centimeter particles. The cling film waste, supplied by a local retailer, contained 30 weight percent of the plasticizer DINCH, a detail that proved crucial: in earlier work by the same group, blending flexible and rigid PVC at a 50:50 ratio raised elongation at break from 25.3 percent for neat recycled rigid PVC to 206 percent, while lowering the glass transition temperature by 34.9 °C. That flexibility is exactly what a brittle recycled matrix needs. Teak sawdust from Ayutthaya was oven-dried, ground, and sieved to an average particle size of 197 micrometers, with a bulk density of 0.27 g/cm³ and moisture content of just 1.46 percent.

To create the cellular structure, the team turned to azodicarbonamide, a widely used chemical blowing agent known as AC. Thermogravimetric analysis showed that AC decomposes sharply between 190 and 200 °C in a single exothermic step, releasing roughly 240 milliliters of gas per gram, composed mainly of nitrogen (65 percent), carbon monoxide (24 percent), carbon dioxide (5 percent) and ammonia (5 percent). That decomposition window sits almost perfectly inside the molding temperature of 195 ± 5 °C used in the study, and well below the composite’s major degradation stage, which occurs between 314.5 and 318.0 °C. This thermal matching meant the blowing agent could generate gas efficiently without triggering significant thermal damage to the PVC matrix or the wood filler, a prerequisite for producing sound foam.

Processing followed a melt compounding and closed-mold foaming route. The PVC pipe particles, cling film and sawdust were blended on a two-roll mill at 165–180 °C, then compression molded. For the foamed versions, AC was added at loadings of 0.5, 1, 3 and 5 weight percent, and the mold was preheated at 120 °C for five minutes before ramping to the foaming temperature. A tightly controlled ten-minute cycle—three minutes for filling and compression, five for foam expansion and cell growth, and two for cooling—kept expansion in check and ensured dimensional uniformity. The closed mold restricted runaway expansion, producing specimens with a characteristic skin–core structure: a denser surface layer surrounding a porous interior.

The foaming results revealed a classic optimum. Density fell steadily as AC content rose, reaching its lowest value at 3 weight percent, where gas generation, melt viscosity and cell stabilization appeared perfectly balanced. Cell density, the number of cells per unit volume, peaked at the same loading, while average cell size shrank from 40.38 micrometers at 0.5 percent AC to just 24.16 micrometers at 3 percent, accompanied by the narrowest, most uniform cell size distribution. Scanning electron microscopy of cryo-fractured, gold-coated specimens showed no surface openings up to 3 percent AC, indicating gas was effectively retained. At 5 percent, however, excessive gas evolution ruptured cells and opened escape pathways, causing cell coalescence, surface defects and a slight rebound in density—a vivid demonstration that more blowing agent is not always better.

Mechanically, the story was one of trade-offs and clever accounting. The unfoamed composite, with a flexural modulus of 2.71 GPa and flexural strength of 54.1 MPa, predictably outperformed the foams in absolute terms, since voids act as stress concentrators and reduce the load-bearing cross-section. Flexural properties fell to their lowest values at 3 percent AC (1.85 GPa and 32.90 MPa), and notched Izod impact strength dropped from 20.82 J/m for the unfoamed material to 13.33 J/m. But when properties were normalized by density, the picture reversed. Specific tensile modulus rose from 1.51 to 1.57 GPa·cm³/g, specific flexural modulus climbed from 2.04 to 2.23 GPa·cm³/g at 3 percent AC, and specific impact strength reached its maximum of 18.05 J·cm³/(m·g) at 5 percent AC. In stiffness- and strength-to-weight terms, the foams matched or beat the solid material—an essential criterion for lightweight construction.

Dynamic mechanical analysis added an unexpected bonus: superior vibration damping. All foamed composites showed tan δ values between 0.61 and 0.64, comfortably above the 0.3 threshold generally considered effective damping and approaching the 0.5 level classified as excellent, whereas the unfoamed composite managed only 0.43. The cellular architecture dissipates mechanical energy through cell-wall bending, friction at cell junctions, interfacial sliding and heterogeneous strain within the porous structure. The 3 percent AC formulation, with its maximum cell density and minimum density, delivered the greatest damping capacity. Glass transition temperatures of the foams, determined from tan δ peaks, ranged from 76.9 to 78.6 °C, slightly above the unfoamed material’s 70.8 °C, suggesting that cellular constraints subtly restrict segmental mobility of the PVC chains.

Thermal and moisture behavior rounded out the assessment. Differential scanning calorimetry confirmed the amorphous nature of the PVC matrix, with no melting peak and no change in transition pattern upon foaming, while the cling film’s plasticizer evidently acted as an internal plasticizing phase that eased foam formation. Thermogravimetry showed initial degradation temperatures declined modestly with AC content, from 240.2 °C for the unfoamed composite to 218.4 °C at 5 percent, but the major degradation temperatures remained essentially unchanged, and char residues of 26.5 to 27.9 percent matched the unfoamed value of 26.2 percent. Water absorption rose with the development of the cellular structure, peaking at 3 percent AC, yet thickness swelling after 60 days of immersion stayed between 3.88 and 7.07 percent—far below the 16.8 to 19.8 percent typical of particleboard and medium-density fiberboard after just 24 hours, thanks to the continuous polymer barrier around the wood particles.

The authors propose a three-stage deformation mechanism to explain how the foams fail under tension: an initial elastic stage in which spherical cells elongate into ellipses, a second stage of microcrack initiation at cell-wall junctions and wood–matrix interfaces, and a final stage of interfacial debonding, crack coalescence and cell collapse leading to fracture. Interestingly, at 5 percent AC, tensile and flexural properties partially recovered, apparently because over-foaming under the constrained mold caused localized densification and thicker cell walls that carried disproportionate load. The team is careful to note that a full life-cycle assessment, including recyclability and end-of-life management, remains future work. Still, the demonstration stands: three waste streams that would otherwise burden landfills can be merged into a single, foamed, dimensionally stable building material whose best formulation—3 weight percent AC—balances low density, fine uniform cells, strong density-normalized mechanics, excellent damping and good moisture resistance. It is a compelling case that the future of sustainable construction may be hiding in the demolition skip and the kitchen drawer.

Subject of Research: Upcycling mixed PVC waste streams and wood sawdust into foamed wood–plastic composites

Article Title: Toward sustainable wood–plastic composite foams fabricated via ternary blending of upcycled rigid poly(vinyl chloride) pipe, waste cling film and wood sawdust

Article References: Sukkaneewat, B., Sanetuntikul, J., Naknaen, P., Jansri, E., & Petchwattana, N. (2026). Toward sustainable wood–plastic composite foams fabricated via ternary blending of upcycled rigid poly(vinyl chloride) pipe, waste cling film and wood sawdust. Cleaner Engineering and Technology, 35, Article 101298. https://doi.org/10.1016/j.clet.2026.101298

Image Credits: AI Generated

DOI: 10.1016/j.clet.2026.101298

Keywords: wood-plastic composites, recycled PVC, cling film waste, polymer foams, chemical blowing agent, azodicarbonamide, circular economy, upcycling, wood sawdust, plasticizers, damping, sustainable building materials

NCM811, chemically written as LiNi0.8Co0.1Mn0.1O2, belongs to the family of layered oxide cathodes in which nickel, cobalt, and manganese are combined in an 8:1:1 ratio. The high nickel fraction is what gives the material its appeal. Nickel is the workhorse of energy density in these cathodes, and pushing its content toward eighty percent allows battery makers to pack more lithium ions into each cell and therefore more range into each electric vehicle. The trade-off has always been chemistry’s stubborn insistence on purity. Conventional synthesis routes for NCM811 begin with high-purity nickel, cobalt, and manganese salts, because even modest contaminant levels can disrupt the carefully ordered layered crystal structure that lithium ions shuttle between during charging and discharging. Maintaining that structural order is the difference between a cathode that endures thousands of cycles and one that degrades within months.

The problem, as the researchers frame it, is twofold. First, cobalt supply is constrained and geopolitically fragile, with the vast majority of the world’s cobalt mined in a handful of regions and processed through a narrow set of supply chains. Second, the synthesis costs of NCM811 from virgin, reagent-grade salts are high enough to limit its large-scale application despite its performance advantages. Recycling offers an obvious escape route, but the conventional hydrometallurgical recycling of cobalt and manganese from zinc-refining residues runs into its own wall: the multi-step processes required to isolate individual metals from a complex industrial solution are expensive enough to erase the economic advantage of recycling in the first place. Solvent extraction, precipitation, and repeated purification stages each add cost, chemical consumption, and waste.

The new work proposes what the authors call a separation-free strategy, and the name captures its elegance. Rather than purifying the leachate produced by dissolving the high-cobalt zinc residue, the team took that leachate, with its mixture of valuable metals and residual impurities, and used it directly as the feedstock for NCM811 synthesis. The idea inverts the usual logic of hydrometallurgy. Instead of asking how to strip a solution down to individual pure metals, the researchers asked whether the battery cathode itself could tolerate, or even benefit from, the impurity profile that industrial residue carries. If the answer were yes, an entire cascade of separation steps could be deleted from the process chain, along with their associated costs, reagents, and effluents.

The critical question was whether the resulting material would actually behave like real NCM811. Impurities in a leachate can do insidious damage to a cathode. Foreign metal ions can substitute into the layered lattice in ways that block lithium diffusion pathways. Excess sodium, calcium, or other residual elements can form secondary phases that interfere with particle growth during calcination. Any of these effects would show up in the electrochemistry as reduced capacity, poor rate capability, or accelerated fade. So the team ran a direct comparison: they synthesized one batch of NCM811 from their residue-derived leachate and a benchmark batch from high-purity reagents, then examined both materials with the same structural and electrochemical tools.

The structural comparison delivered the study’s first encouraging verdict. According to the abstract, the leachate-derived sample exhibits a crystal structure and micro-morphology similar to those of the sample synthesized from high-purity reagents. In practical terms, that means the layered oxide framework formed properly despite the imperfect feedstock, and the particles developed the morphology that cathode manufacturers look for, the sort of uniform, well-formed secondary particles that support consistent lithium intercalation. For a material as structurally demanding as NCM811, achieving reagent-grade crystallography from an industrial waste stream is the central proof of concept, and the fact that the two samples converged on similar structures suggests the impurities in the zinc residue leachate were either present at tolerable levels or left behind in the solid phases during synthesis.

Structure alone, however, does not make a cathode. The more consequential test was electrochemical, and here too the results were striking. The leachate-derived sample delivered electrochemical performance and reaction kinetics comparable to the reagent-grade benchmark. Reaction kinetics matter because they govern how fast lithium ions can move in and out of the cathode structure, which in turn determines how much capacity a cell can deliver at high charging and discharging rates. A cathode with sluggish kinetics might match a premium material’s capacity at gentle lab currents yet collapse in a fast-charging scenario. By showing that the residue-derived material kept pace with the benchmark on kinetics as well as overall performance, the researchers demonstrated that the separation-free route produced not a degraded approximation of NCM811 but genuine NCM811 quality.

The implications ripple out in several directions at once. For zinc producers, the study transforms a residue stream from a disposal liability into a feedstock for one of the highest-value products in the battery materials market. Zinc purification residue is generated continuously and at scale wherever zinc is refined, and the cobalt content that makes disposal problematic is precisely the cobalt that NCM811 demands. For battery manufacturers, the work suggests a route to low-cost NCM811 fabrication that bypasses the premium pricing of battery-grade cobalt salts. And for the broader circular economy, it exemplifies a philosophy increasingly visible in materials research: rather than recycling waste down into its constituent elements and rebuilding from scratch, upcycle the waste directly into a finished functional material, conserving both the embedded chemical value and the energy that would otherwise be spent on separation.

The approach also carries meaningful sustainability arithmetic. Every purification stage deleted from a hydrometallurgical flowsheet removes not only its operating cost but also its chemical inputs, its water consumption, and its waste outputs. Conventional recycling chains for complex residues can involve dozens of extraction and stripping stages, each with its own organic reagents and raffinate streams. A separation-free strategy collapses that complexity into a single dissolution-and-synthesis pathway. If the economics hold at industrial scale, the study’s claim of a cost-effective pathway for high-value utilization of high-cobalt residue becomes more than a laboratory curiosity; it becomes a template for how critical-metal recovery should be designed, with the end product, not the purity of intermediates, as the organizing goal.

There are, of course, the familiar distances between laboratory demonstration and industrial reality. Real refinery leachates vary in composition from plant to plant and batch to batch, and a process tuned to one residue stream will need robustness across that variability. Scaling the synthesis conditions that produced clean layered oxides on the bench, from co-precipitation through high-temperature calcination, to tonnage quantities is the perennial challenge of cathode manufacturing, one that even established producers navigate with difficulty. The long-term cycling stability of the leachate-derived material over thousands of cycles, and its behavior in full commercial cells rather than laboratory half-cells, remain questions for subsequent work. Yet the core result stands on its own merits. A cathode built from industrial waste performed like one built from laboratory-grade chemicals, which is precisely the kind of result that can redirect both research funding and industrial investment. As demand for nickel-rich cathodes accelerates and cobalt supply tightens, the zinc industry’s forgotten cobalt-rich residue may find itself reclassified from waste product to strategic asset, and the separation-free philosophy behind this work may spread well beyond a single residue stream.

Subject of Research: Upcycling of high-cobalt zinc hydrometallurgy residue into NCM811 lithium-ion battery cathode materials

Article Title: High-value upcycling of high-cobalt zinc hydrometallurgy residue to NCM811 cathode materials via a separation-free strategy

Article References: High-value upcycling of high-cobalt zinc hydrometallurgy residue to NCM811 cathode materials via a separation-free strategy. (n.d.). https://doi.org/10.1007/s11581-026-07499-8

Image Credits: AI Generated

DOI: 10.1007/s11581-026-07499-8

Keywords: NCM811, lithium-ion batteries, cathode materials, cobalt recycling, zinc hydrometallurgy, upcycling, separation-free synthesis, critical metals, energy storage, hydrometallurgical residue, nickel-rich cathodes, circular economy