The finding matters because cell expansion is one of the major cost bottlenecks in any cell-derived protein production system. Satellite cells are the stem cells responsible for repairing and building skeletal muscle, and they are the preferred starting material for cultivated meat and other cell-based protein ingredients because they naturally proliferate and then differentiate into muscle fibers. In most laboratories around the world, virtually every mammalian cell line is cultured at 37 degrees Celsius. But birds are not mammals. A healthy chicken runs markedly hotter than a human, and cells isolated from chicken embryos may therefore be operating below their evolutionary optimum when grown under the conventional mammalian regime.

To test this idea rigorously, the team isolated satellite cells from the leg muscles of 15-day-old chick embryos using an enzymatic digestion protocol with collagenase D and dispase II, followed by sequential filtration and differential plating to remove contaminating fibroblasts. Before any growth experiments began, the researchers performed chromosomal karyotype analysis on the cells, including GTG-banding, to confirm their chicken origin and to verify that neither culture temperature was inducing chromosomal abnormalities. The cells displayed the expected avian karyotype, with roughly eight to ten pairs of large macrochromosomes and the characteristic dot-like microchromosomes, and this pattern held true regardless of whether the cells had been maintained at 37 or 40 degrees Celsius. That genetic stability check is essential for any production platform, since uncontrolled chromosomal damage during long-term expansion would disqualify a cell population from food or biomedical applications.

The growth data were striking. When the researchers counted cells at 48-hour intervals across successive passages, the cultures held at 40 degrees Celsius consistently produced higher cell numbers than the 37-degree controls, with statistically significant differences appearing at passages 6, 7, 8, 10, and 11. Population doubling time, a standard metric describing how long a cell population needs to double in number, was significantly shorter at 40 degrees at multiple passages. Perhaps more importantly, the 37-degree cultures began to show signs of growth retardation and increasing variability from passage 6 onward, a pattern that suggests cellular senescence or stress accumulating over extended culture. The warmer cells, by contrast, maintained stable proliferation throughout the experiment.

Metabolic assays reinforced the picture. Using a Cell Counting Kit-8 assay, which measures the metabolic activity of living cells as a proxy for viability, the team found that cells grown at 40 degrees Celsius showed significantly higher activity both at early passage, passage 3, and at late passage, passage 9. In practical terms, this means the physiological temperature did not merely push cells through a temporary growth spurt; it appeared to sustain their health and vigor over many generations of expansion. The authors emphasized that the prolonged 40-degree exposure did not induce chronic thermal toxicity, addressing the most obvious concern about growing cells above the conventional mammalian setpoint. For bioprocess engineers, shorter doubling times combined with sustained viability translate directly into fewer days, fewer culture vessels, and lower cost per gram of cell-derived protein.

The molecular story was more nuanced. Immunofluorescence staining for paired box-7, or Pax-7, the transcription factor that defines the quiescent satellite cell state, showed a higher Pax-7 protein ratio in the 40-degree group. Yet when the researchers measured messenger RNA by quantitative PCR, Pax-7 transcript levels were significantly higher at 37 degrees, while expression of myoblast determination protein, or MyoD, the master regulator that marks the commitment to myogenic differentiation, was upregulated at 40 degrees. The authors caution that mRNA abundance and protein abundance are regulated at different biological levels and do not always correlate, so the two measurements should be read as complementary indicators of myogenic status rather than contradictory ones. Taken together, the data suggest that the warmer condition strikes a balance between cell cycle progression and differentiation, shifting cells transcriptionally toward myogenic commitment while still supporting robust proliferation.

Terminal differentiation, however, was essentially unchanged. When the researchers switched the cells to differentiation medium and assessed myogenin expression, myosin heavy chain production, and the fusion index, the percentage of nuclei incorporated into multinucleated myotubes, they found no statistically significant differences between the two temperatures. Myogenin mRNA, myogenin protein, and myosin heavy chain staining all told the same story: both temperatures could drive the cells to form mature muscle-like tissue, but they appeared to get there through different regulatory routes, one centered on Pax-7 and the other on MyoD. This is an encouraging result for producers, because it implies that switching to 40 degrees during the expansion phase does not compromise the cell’s fundamental ability to differentiate into contractile muscle material later.

The most provocative part of the study concerns nutrition. Bicinchoninic acid protein assays showed that total protein content did not differ significantly between the two temperatures, and neither differed from actual chick leg muscle tissue. But amino acid profiling with a dedicated amino acid analyzer revealed a qualitative split. Cells cultured at 37 degrees accumulated higher levels of glycine and alanine, amino acids associated with metabolic homeostasis, cellular integrity, and adaptive responses under altered growth conditions. Cells cultured at 40 degrees were significantly enriched in the branched-chain amino acids valine and isoleucine, as well as lysine. Branched-chain amino acids are the essential building blocks most directly tied to muscle protein anabolism, and they are known to activate the mTOR signaling pathway, the same nutrient-sensing pathway that previous work has linked to temperature-enhanced proliferation in avian satellite cells. In other words, the warmer culture condition not only grows cells faster but also yields a protein product with a profile skewed toward the amino acids most valued in muscle-derived food proteins.

The authors conclude that 40 degrees Celsius represents an optimal culture temperature for the efficient expansion of chick satellite cells, offering a practical, equipment-light strategy for anyone producing cell-derived protein materials. The study also fills a gap in the literature: earlier reports had shown that temperatures near the avian physiological range boost proliferation of chicken satellite cells, but those investigations largely stopped at cellular kinetics and early myogenic markers, without evaluating the nutritional quality of the end product. By integrating quantitative growth measurements, molecular validation, and full amino acid profiling in a single framework, the Korean team has provided a template for how culture conditions should be optimized not just for speed but for the biochemical character of the final ingredient. As the alternative protein market races toward projected demand of tens of millions of tons annually, such incremental process refinements, adjusting a thermostat rather than engineering a new cell line, may prove to be among the most immediately deployable tools for making cultivated protein economically competitive.

Beyond the headline findings, the study carries practical implications for how cell-culture processes are designed at scale. Incubator temperature is one of the few process parameters that costs essentially nothing to change, unlike medium formulation, scaffold materials, or genetic engineering, all of which add expense, regulatory complexity, or both. A simple thermal adjustment that shortens population doubling time compounds across every passage in an expansion pipeline, so even a modest per-passage gain can translate into substantially shorter overall production timelines when cells are grown through the ten or more passages typically required to build industrial biomass.

The amino acid results also invite a broader conversation about how cell-derived ingredients should be evaluated. Conventional nutrition science judges protein sources partly on their essential amino acid profile, and the enrichment of valine, isoleucine, and lysine at 40 degrees Celsius suggests that process conditions can shape not just how much protein is made but what kind. Lysine is of particular interest because it is frequently the limiting essential amino acid in cereal-based diets worldwide, so a production method that naturally biases cells toward lysine-rich protein could carry nutritional relevance beyond the cultivated meat sector.

Some caveats remain. The experiments were conducted in two-dimensional culture with serum-containing medium, whereas commercial production would likely rely on serum-free formulations and three-dimensional scaffolding, either of which could interact with temperature in unpredictable ways. The cells were also derived from embryos rather than from adult animals, and whether satellite cells from mature broiler chickens respond identically to the warmer regime has yet to be demonstrated. The authors likewise note that the divergence between Pax-7 protein and messenger RNA measurements underscores how much basic biology of avian myogenesis at physiological temperature still awaits mechanistic explanation.

Even so, the work strengthens a growing consensus that species-appropriate culture conditions deserve systematic attention. As cell agriculture matures, the laboratories that win on cost may be those that pay closest attention to the biology of the organism their cells came from.

Subject of Research: Effect of physiological culture temperature on proliferation, myogenic differentiation, and amino acid profile of chick satellite cells

Article Title: Physiological temperature enhances proliferative capacity and protein production characteristics of chick satellite cells

Article References: Kim, D. B., Lee, H. J., Lee, H. W., Jang, H. G., Oh, S.-H., Kim, J. H., & Lee, S. Y. (2026). Physiological temperature enhances proliferative capacity and protein production characteristics of chick satellite cells. Food Science of Animal Resources, 46(1), Article 101. https://doi.org/10.1007/s44463-026-00103-7

Image Credits: AI Generated

DOI: 10.1007/s44463-026-00103-7

Keywords: chick satellite cells, culture temperature, cell-derived protein, cultivated meat, branched-chain amino acids, cell proliferation, myogenic differentiation, alternative protein, cell culture, Pax-7, MyoD, mTOR signaling

The research, published in the reputable journal ACS Food Science & Technology, explores the biochemical composition and heat stability of proteins extracted from dried marigold flowers. By employing a series of sequential liquid extractions, scientists were able to isolate different groups of proteins from powdered marigold samples, allowing for comprehensive profiling of amino acid composition and physico-chemical properties. This methodical approach opens new doors to understanding how plant proteins beyond the usual legumes and grains can be harnessed for human consumption.

One of the striking findings from the study is the high concentration of umami-related amino acids such as glutamic acid and aspartic acid within certain marigold protein fractions. These amino acids are responsible for imparting savory flavors, which have significant applications in food formulation as natural flavor enhancers. Their presence suggests that marigold-derived proteins could add a desirable umami taste to a variety of plant-based products, offering food developers a novel ingredient that improves palatability without added chemical flavoring agents.

Heat stability is another critical factor in food protein functionality, particularly concerning processing techniques involving cooking and baking. Unlike many plant proteins extracted from pea or chickpea, which can denature at relatively low temperatures, the proteins isolated from pot marigold flowers demonstrated remarkable thermal resilience. They maintained structural integrity at temperatures as high as 105 degrees Celsius (221 degrees Fahrenheit), conditions that typically degrade other plant proteins. This robustness implies that marigold proteins can retain their nutritional and functional characteristics even after exposure to high heat, making them highly suitable for inclusion in thermally processed food products.

Another standout feature of the marigold proteins studied is their exceptional emulsifying capacity. Emulsification refers to a protein’s capability to stabilize mixtures of oil and water by reducing surface tension and preventing phase separation. Two distinct marigold protein extracts showed excellent performance in this area, which is a desirable trait for creating stable emulsions used in salad dressings, mayonnaise analogs, and dairy-free food substitutes. These findings position marigold proteins as promising functional ingredients for reformulating classic foods into plant-based versions with improved texture and shelf life.

Beyond tastiness and heat tolerance, the researchers observed that marigold proteins also possess effective hydration and antioxidant properties. Hydration capacity plays a vital role in food texture, influencing the mouthfeel and moisture retention of products like baked goods. Concurrently, antioxidant functionality suggests that marigold proteins could help inhibit oxidative spoilage and enhance the nutritional profile of foods by scavenging free radicals. Such multi-functional attributes amplify the potential of these proteins in creating not only sustainable but also health-promoting food formulations.

The valorization of agricultural byproducts is a growing trend in food science, driven by the need to reduce waste and promote circularity in food systems. Approximately 40% of pot marigold production is currently discarded post-ornamental use, a figure that demonstrates vast underutilization of a potentially valuable resource. This research highlights the critical opportunity to upcycle these otherwise wasted flowers into high-value protein ingredients, adding economic and environmental incentives to pursue their cultivation and processing.

Current knowledge about plant proteins largely centers on legumes, cereals, and oilseeds, but edible flowers and other horticultural commodities remain largely untapped. This study challenges conventional boundaries by characterizing flower proteins with rigorous biochemical analyses and functional assays, setting a precedent for further explorations into similar plant sources. The emphasis on detailed amino acid profiling and heat stability evaluation underscores the scientific rigor and practical relevance of this work in food innovation.

Looking ahead, the research team plans to expand their investigation to assess the health benefits of marigold proteins, including potential antioxidant activities and digestibility in human nutrition. Subsequent efforts will target product development, leveraging marigold proteins in baked goods and emulsion-based foods to evaluate sensory acceptance among consumers. This holistic approach from biochemical characterization to consumer testing ensures that the potential for marigold proteins moves beyond the lab towards real-world applications.

The implications of this work extend beyond mere protein sourcing, touching upon themes of sustainability, food security, and culinary innovation. As the global population grows and environmental concerns mount, tapping into overlooked agricultural waste streams aligns with broader goals to develop resilient and environmentally conscious food systems. Marigold proteins exemplify how such innovative pathways can be scientifically validated and technologically feasible.

Moreover, the study underscores the importance of interdisciplinary collaboration in addressing complex food challenges. By integrating agricultural science, protein chemistry, food technology, and sensory science, the research presents a model of how emerging food ingredients should be developed and evaluated comprehensively. This integrated methodology ultimately supports the transition towards more diverse, nutritious, and sustainable plant-based diets.

Anand Mohan, the corresponding author, aptly summarizes the societal importance of this research: it not only reveals the hidden potential of a common flower but also aligns with public interest in reducing food waste and diversifying protein sources. Such science-driven narratives resonate widely as consumers and industry stakeholders alike seek solutions that are scientifically sound, ethically responsible, and environmentally sustainable.

Scientific funding from the U.S. Department of Energy’s Office of Science supported the identification of marigold protein amino acid profiles, reflecting the critical role of public agencies in advancing food innovation. The publication of these findings in ACS Food Science & Technology ensures wide dissemination to both the academic community and food industry professionals poised to translate research insights into novel products.

In summary, the exploration of pot marigold flowers as a sustainable plant protein source epitomizes the convergence of food waste valorization, functional food ingredient development, and plant-based nutrition innovation. With promising heat stability, umami enhancement potential, emulsifying properties, and health-related functionalities, marigold proteins hold remarkable promise for next-generation food applications that are tasty, nutritious, and environmentally responsible.

Subject of Research: Protein content and functional properties of pot marigold flowers (Calendula officinalis) as a sustainable source of plant-based protein.

Article Title: Marigold flowers show potential as a source of plant-based protein

News Publication Date: 29-Apr-2026

Web References:
10.1021/acsfoodscitech.5c01215

Keywords: Plant proteins, protein functionality, marigold flowers, Calendula officinalis, sustainable food ingredients, heat stability, emulsification, umami amino acids, antioxidant properties, food waste valorization

The survey results underscore a robust public consensus on workers’ rights, with an overwhelming 71% of Americans affirming that meatpacking workers possess the fundamental right to strike in pursuit of improved pay and safer working conditions, as opposed to being compelled to continue production without interruption. This statistic reflects a vital acknowledgment of labor rights amid the challenges faced by those on the front lines of food production, particularly in industries notorious for hazardous working environments.

Another critical dimension explored in the survey pertains to the demographic breakdown of attitudes toward the potential transformation of traditional meat processing facilities. While Americans are largely divided—with 36% in support and 38% in opposition—there is a pronounced inclination among younger respondents, specifically Generation Z and Millennials, to endorse the conversion of slaughterhouses into facilities dedicated to the production of plant-based or cell-cultivated meat products. This generational divergence points to a broader cultural shift favoring sustainable and ethical alternatives within the food industry.

The economic rationale for this potential shift is compelling. According to financial analyses reported by the Wall Street Journal, major meatpacking corporations, including JBS—the world’s largest meatpacker—have experienced considerable financial losses in their conventional beef operations. Notably, JBS reported an adjusted operating loss of $617 million in its beef sector over the past year, a stark increase from the $37 million loss recorded the previous year. This financial pressure may incentivize an accelerated pivot toward more profitable and environmentally sound alternatives such as plant-based proteins.

A crucial social aspect illuminated by the survey involves the status of migrant workers within the meatpacking industry. Many of the striking workers are migrants, with a notable portion being undocumented. The visibility of these workers on the picket lines has raised concerns about the possibility of immigration enforcement agencies conducting targeted raids. However, the survey reveals that a substantial majority—61% of Americans—believe it would be unjust to subject striking workers to immigration enforcement actions as a consequence of their labor activism. This finding highlights a widespread public empathy towards vulnerable workers striving for improved conditions.

The survey also delves into public perceptions regarding legal ramifications associated with labor strikes. Only 19% of respondents favor the imposition of legal consequences, such as immigration enforcement, against workers participating in strikes. Meanwhile, 61% oppose such measures, and 20% remain uncertain. This prevailing sentiment affirms a recognition of labor strikes as a legitimate exercise of workers’ rights, rather than an activity warranting punitive actions.

Experts within the Physicians Committee for Responsible Medicine emphasize the intrinsic danger associated with meatpacking, describing it as one of the most hazardous occupations in the United States. Xavier Toledo, a registered dietitian affiliated with the organization, underscores the public’s empathy toward striking workers and connects the discourse to larger systemic issues within the food production sector. He articulates that a transition toward the manufacture of plant-based or cell-cultivated meat products could result in significantly safer and cleaner working environments.

The survey’s implications are multifaceted, touching on occupational health, ethical consumption, economic sustainability, and immigration policy. It challenges stakeholders—industrial leaders, policymakers, and consumers alike—to rethink the paradigms governing meat production. The intersection of worker safety and environmental considerations creates a compelling argument for a paradigm shift in how protein is generated and processed at scale.

Consumers’ growing support for sustainable alternatives, particularly among younger generations, signals a potentially transformative movement in food production practices. Coupled with the economic urgency prompted by increasing losses in conventional beef production, the momentum toward plant-based and cell-cultivated proteins appears to be gaining traction not merely as a niche market but as a viable industrial strategy.

The survey outcomes also serve as a clarion call for enhanced protections for vulnerable migrant workers who constitute a critical labor force within meatpacking plants. The widespread opposition to immigration enforcement actions against striking workers suggests a societal acknowledgment that labor rights should not be undermined by immigration status, thereby urging humane and equitable treatment.

From a public health perspective, the transition to plant-based protein production may yield benefits beyond worker safety, potentially reducing zoonotic disease risks and environmental degradation associated with traditional livestock farming. The Physicians Committee’s advocacy thus aligns labor rights with broader goals of preventive medicine and sustainable food systems.

In conclusion, the comprehensive survey by Morning Consult and the Physicians Committee reveals a significant shift in American public opinion favoring workers’ rights to strike and a cautious but growing endorsement for the transformation of meat production facilities toward plant-based outputs. These findings reflect evolving societal values that prioritize worker safety, economic pragmatism, and environmental stewardship, indicating a pivotal moment for the future of food production in the United States.

Subject of Research: People
Article Title: Public Opinion Supports Meatpacking Workers’ Strike Rights and Endorses Plant-Based Protein Transition Amid Industry Struggles
News Publication Date: Not specified
Web References: Not provided
References: Wall Street Journal report on JBS financial losses
Image Credits: None provided

Keywords: Meatpacking strike, labor rights, JBS slaughterhouse, plant-based protein, cell-cultivated meat, migrant workers, immigration enforcement, workplace safety, economic losses, sustainable food production, public opinion survey, Physicians Committee for Responsible Medicine

This four-year project, backed by a generous grant of $387,000 from the USDA’s Pulse Crop Health Initiative, focuses on the fermentation of dry chickpeas and peas to develop a novel form of tempeh. Traditionally produced from soybeans, tempeh is a centuries-old fermented food originating in Indonesia. However, the intricate science behind its fermentation has largely remained unexplored in a methodical manner. The primary aim of Xiao’s research is to unravel the complex biochemical and nutritional transformations that occur during this fermentation process.

In the Western diet, health issues such as obesity, fatty liver disease, hyperlipidemia, and diabetes have become prevalent. Preliminary studies suggest that introducing chickpea and pea tempeh as dietary options could counteract these conditions effectively. This research is particularly timely, as public health officials and nutritionists grapple with the consequences of a nutrient-poor diet heavily reliant on animal products.

In collaboration with two esteemed co-investigators from UMass Amherst, sensory scientist Alissa Nolden and genomics specialist John Gibbons, Xiao’s team will methodically examine how the fermentation process alters the nutritional profile and sensory characteristics of the chickpea and pea tempeh. The research will incorporate advanced chemical analyses to identify and quantify the bioactive compounds generated during fermentation, including amino acids, flavonoids, and other beneficial nutrients.

Xiao emphasizes the importance of achieving optimal functionality in the tempeh products, underscoring that taste is paramount for consumer acceptance. Consumers’ perceptions surrounding taste significantly influence the likelihood of them incorporating these plant-based alternatives into their diets regularly. As Xiao states, “If it’s not tasteful, people won’t like it, and they won’t consume it frequently enough to offer health benefits.” Thus, he recognizes that addressing the challenge of flavor is critical to the success of any plant-based protein initiative.

Moreover, Xiao’s innovative approach leverages what he refers to as “smart fermentation” techniques. These methods not only enhance the nutritional value of the tempeh but also aim to create a high-quality plant protein derived from soybean meal, which is a byproduct of soybean oil extraction. By harnessing the full potential of these legumes, Xiao’s research identifies sustainable pathways to produce nutrient-dense protein sources while minimizing food waste.

During the research project, the team will meticulously monitor how the fungi employed in the fermentation process interact with the nutrients in the chickpeas and peas. This dynamic relationship will yield various metabolites that have significant implications for the final product’s health benefits and sensory attributes. By mapping these changes, the research aims to highlight the molecular mechanisms that contribute to the tempeh’s texture, flavor profile, and overall nutritional integrity.

A crucial aspect of the study will involve consumer participation. A diverse panel will be engaged to evaluate the sensory properties of the produced tempeh, focusing on parameters such as taste, aroma, and texture. Their feedback will provide valuable insights into the practical acceptability of the chickpea and pea tempeh, informing potential enhancements to the fermentation conditions and process parameters to optimize enjoyment.

The research team is also focused on the health implications of incorporating tempeh into diets high in fat and sugar, mimicking contemporary eating patterns. This exploration will be conducted using an obese rodent model designed to simulate the adverse effects of a Western diet. Xiao and his team want to ascertain whether their chickpea tempeh can serve as a preventive dietary measure to mitigate the detrimental health impacts associated with excessive intake of unhealthy fats and sugars.

Initial findings from preliminary studies have already yielded promising insights. Research indicated that feeding obese mice chickpea tempeh successfully inhibited weight gain associated with diets high in animal fats. Furthermore, there was evidence suggesting that it also mitigated the onset of fatty liver disease and fostered positive alterations in the gut microbiome. Such results provide a compelling rationale for further investigation into the health-enhancing properties of pulse-based tempeh.

By transforming dry chickpeas and peas into a tasty, nutritious tempeh alternative, Hang Xiao’s research holds significant potential for advancing public health. If successful, his innovations could pave the way for widely adopted meat alternatives that contribute positively to dietary habits while also promoting sustainable agricultural practices. As the global demand for plant-based protein continues to surge, research initiatives like Xiao’s will be critical in shaping the future of food innovation and environmental sustainability.

In conclusion, with the meticulous fusion of traditional fermentation practices and modern food science, Hang Xiao’s research represents an exciting frontier in the development of plant-based proteins. His aim to enhance the nutritional functionality and consumer palatability of tempeh could revolutionize the way we perceive and consume plant-based alternatives, offering new solutions to mitigate the health challenges posed by the Western diet.

Subject of Research: Fermentation of Dry Chickpeas and Peas to Create Novel Tempeh
Article Title: Revolutionizing Plant-Based Proteins: Hang Xiao’s Research on Chickpea and Pea Tempeh
News Publication Date: [Insert Date]
Web References: [Insert web references if needed]
References: [Insert references if needed]
Image Credits: [Insert image credits if needed]

Keywords: plant-based protein, tempeh, chickpeas, peas, fermentation, nutrition, sustainable food, health benefits, Western diet, obesity, health science, food innovation.

Credit: Nahmias Lab