The research, published in Food Science & Nutrition, examined three teff varieties from the Ethiopian Institute of Agricultural Research’s Debrezeit Agricultural Research Center: Bora, a very white grain; Jitu, a pale white variety; and Filagot, a red-grained type. Each variety was milled using a local attrition milling method and then fractionated through standard laboratory test sieves into three size classes: a coarse fraction between 260 and 360 micrometers, a middle fraction between 160 and 260 micrometers, and a fine fraction between 90 and 160 micrometers. Particles larger than 360 micrometers and smaller than 90 micrometers were removed, giving the researchers tightly controlled flour fractions to work with.

The first striking finding concerned bulk density, a property that matters enormously to food manufacturers because it determines how much flour fits into a given volume and how it packs during storage and transport. As particle size decreased from the coarsest to the finest fraction, bulk density rose from 0.72 to 0.86 grams per milliliter. The explanation is geometric: smaller particles nestle into the pore spaces left between larger ones, reducing porosity and increasing compaction. Variety also mattered, with the red Filagot flour reaching the highest bulk density at 0.83 grams per milliliter, compared with 0.74 for the white Bora variety. Similar patterns have been reported for other milled products, including sugar beet powder, whose bulk density climbed as particles shrank.

Flow behavior told the opposite story. Using the funnel method, the researchers measured the angle of repose, the natural slope a conical heap of flour forms when poured onto a flat surface. Finer flours produced steeper heaps: the angle rose from 37.40 degrees for the coarsest fraction to 41.80 degrees for the finest. This happens because smaller particles have more surface area per unit mass, giving cohesive surface forces and friction more opportunity to act and making the powder stickier and harder to move. For engineers designing hoppers and conveying systems, the implication is practical and important: the inclination of a hopper must exceed the flour’s angle of repose to keep material flowing without clogging, so finer teff flours will demand steeper equipment geometries.

Color measurements on the Hunter L, a, b scale revealed a subtle but consistent relationship between particle size and appearance. Lightness values increased as particles got smaller, rising from 66.88 for the coarsest fraction to 68.73 for the finest, while redness and yellowness values both fell. The researchers attribute this to the fine, homogeneous pores of smaller particles, which absorb less light and reflect more, making the flour appear lighter and less saturated. Variety effects were even more pronounced: the white Bora flour scored the highest lightness at 70.29, while the red Filagot flour scored lowest at 64.74 and showed the highest redness value, a consequence of pigments from the grain’s seed coat dispersing through the flour during milling. In terms of color alone, the finest fraction was judged the most desirable, being lighter and less reddish than its coarser counterparts.

Mineral analysis added a nutritional dimension to the varietal comparison. The red Filagot variety significantly outperformed its white relatives, delivering 132 milligrams of calcium, 14.31 milligrams of iron, and 4.14 milligrams of zinc per 100 grams of flour, roughly double the iron content of the Bora variety. This aligns with earlier findings that red teff tends to be richer in iron than white types. Intriguingly, particle size had no significant effect on mineral content, meaning that milling finer does not dilute the grain’s micronutrient profile. The minerals were evenly distributed across fractions, so processors can pursue fine milling for functional benefits without sacrificing nutritional value.

The sensory heart of the study came when the flours were transformed into cookies using a standard formulation of teff flour, sugar, shortening, salt, baking soda, and water, baked at 190 degrees Celsius for 18 minutes. Thirty trained panelists, drawn from food science and food technology departments, evaluated the cookies within 24 hours of baking on a seven-point hedonic scale covering color, texture, crispness, taste, flavor, and overall acceptability. The results were unambiguous: finer flour made better cookies. Samples made from the 90 to 160 micrometer fraction scored highest on nearly every attribute, with overall acceptability reaching 6.00, compared with just 4.90 for cookies made from the coarsest flour.

Crispness showed one of the most compelling particle-size relationships. Cookies baked from the finest flour earned a crispness score of 6.51, while those from the coarsest flour managed only 5.74. The researchers explain this through starch damage and surface area: smaller particles present more surface to the dough matrix, producing a thinner, more brittle structure that fractures cleanly rather than deforming during chewing. As particle size increases, the force and energy required to break the cookie rise, making samples harder and less crispy. Variety mattered too, though differently across attributes. Bora cookies dominated in color, texture, taste, flavor, and overall acceptability, scoring 6.35 overall, while the red Filagot cookies lagged at 4.43, likely penalized by their darker color, which lowered consumer preference despite the variety’s superior mineral content.

The study’s broader significance lies in what it means for teff’s global future. Despite an exceptional nutritional profile, complete with all essential amino acids and more lysine and vitamins than most other cereals, teff remains largely confined to Ethiopia, and industrial processing of the grain is still in its infancy. By demonstrating that variety and particle size jointly govern flour behavior and consumer acceptance, the research gives millers and bakers a concrete parameter to optimize. The finest fraction, 90 to 160 micrometers, combined favorable flow characteristics for handling with the best sensory outcomes in the baked product, while the white Bora variety proved the strongest candidate for consumer-facing products. The panelists’ scores spanned the full hedonic range, from a low of 4.00, meaning neither like nor dislike, for coarse Filagot cookies up to 7.00, meaning liked very much, for fine Bora cookies, a spread that underscores just how much processing decisions can shape the fate of a single ingredient.

For a grain that has sustained Ethiopian communities for millennia, these findings offer a roadmap for wider adoption. Gluten-free markets are expanding rapidly as consumers seek alternatives to wheat, and teff brings antioxidant properties and a complete amino acid profile that few competitors can match. The lesson from this research is that nutrition alone will not win over global palates; the physical craft of milling, the size of each particle, and the choice of variety all converge to determine whether a teff cookie delights or disappoints. With the right combination of fine milling and light-colored grain, this ancient Ethiopian staple may finally be positioned to take its place on bakery shelves worldwide.

Subject of Research: Effect of teff flour variety and particle size on flour physicochemical properties and gluten-free cookie sensory quality

Article Title: Impact of Particle Size on Flour Physicochemical Properties and Cookies Sensory Acceptability Made From Teff (Eragrostis tef (Zucc.) Trotter)

Article References: Boka, A. L., & Tolesa, G. N. (2026). Impact of Particle Size on Flour Physicochemical Properties and Cookies Sensory Acceptability Made From Teff ( Eragrostis tef (Zucc.) Trotter). Food Science & Nutrition, 14(10), Article e72432. https://doi.org/10.1002/fsn3.72432

Image Credits: AI Generated

DOI: 10.1002/fsn3.72432

Keywords: teff, flour particle size, gluten-free cookies, bulk density, angle of repose, sensory evaluation, food color, mineral content, Ethiopia, food processing, Eragrostis tef, baking quality

The stakes are high. Genuine honey is a supersaturated sugar solution produced by honeybees through the enzymatic transformation of nectar, and its value goes far beyond sweetness. Chemically, honey consists mainly of fructose at roughly 38.2 percent and glucose at about 31.3 percent, with minor amounts of sucrose, maltose, amino acids, enzymes such as diastase, glucose oxidase and invertase, organic acids like gluconic acid, minerals, vitamins, and a broad arsenal of phenolic and flavonoid compounds. That complex cocktail underpins honey’s antioxidant, antibacterial, anti-inflammatory and antiviral activities, which is why regulators classify it not merely as a sweetener but as a functional food with potential pharmacological benefits.

All of that makes honey expensive, and high prices invite adulteration. Because production is limited and global demand keeps climbing, unscrupulous producers frequently stretch their product with cheap sugar syrups, including glucose syrup, fructose syrup, invert sugar and high-fructose corn syrup. These adulterants are notoriously difficult to detect, particularly when added in moderate amounts, and their presence can significantly alter the physicochemical properties and therapeutic quality of the final product. The practice deceives consumers, undercuts honest beekeepers, and poses a persistent headache for food safety and regulatory agencies worldwide.

Existing detection methods are powerful but cumbersome. High-performance liquid chromatography, gas chromatography, isotope ratio mass spectrometry, Fourier transform infrared spectroscopy and nuclear magnetic resonance spectroscopy have all been deployed against sugar adulteration, each with its own detection floor. Fluorescence measurements, based on the ratio of emission intensities at 365 and 425 nanometers, detect cane sugar syrup down to 15 percent. The carbon-13 to carbon-12 isotope ratio catches fructose syrup adulteration only at 27 percent. FTIR analysis in the 992 to 923 inverse centimeter range reaches 5 percent, and HPLC of rice syrup markers manages 2.5 percent. But these techniques are labor-intensive, time-consuming, and demand sophisticated instrumentation and trained personnel, making them poorly suited for routine or on-site screening.

Enter electrochemical impedance spectroscopy, or EIS. The method works by applying a small alternating voltage, in this case just 10 millivolts, across a frequency sweep from 20 hertz up to 500 kilohertz and measuring the sample’s complex impedance, the frequency-dependent opposition to current flow. That impedance reflects changes in ionic conductivity, dielectric constant and electrochemical behavior, all of which are exquisitely sensitive to composition, viscosity, ionic strength and intermolecular interactions. Because sugar syrups alter exactly those properties, the researchers hypothesized that EIS could serve as a sensitive and rapid tool for evaluating adulteration. The technique has already proven its worth in food quality control, detecting adulterants in milk, fruit juices, olive oil and wine, and it has previously been used to discriminate honey by botanical origin and to analyze potassium content.

The experimental design was elegantly straightforward. The team, led by Hamdi Ben Halima and Nicole Jaffrezic-Renault of the UTINAM Institute at Université Marie et Louis Pasteur in Besançon, together with Mustafa Kemal Sezgintürk of Çanakkale Onsekiz Mart University, purchased honeys from six botanical origins at a French supermarket: lime (Tilia europea), black locust or acacia (Robinia pseudoacacia), thyme (Thymus vulgaris), sweet chestnut (Castanea sativa), lavender (Lavandula angustifolia) and lemon citrus (Citrus × limon). Each honey was adulterated with a 99.9 percent pure saccharose syrup from beet sugar at 10, 20, 50 and 80 percent by weight, then diluted to 20 percent in deionized water to reduce viscosity. Measurements were performed with a Biologic SP-200 potentiostat in a thermostated cell at 25 degrees Celsius, using a three-electrode configuration: a saturated calomel reference electrode, a platinum plate counter-electrode and a platinum wire working electrode, all cleaned between measurements.

The raw data take the form of Nyquist plots, in which the imaginary part of the impedance is plotted against the real part, tracing a characteristic arc whose shape encodes the sample’s electrical personality. To extract meaningful numbers from those curves, the researchers fitted them to a Randles equivalent electrical circuit, a standard model comprising the electrolyte resistance, a bulk resistance term, the capacitance of the electrical double layer forming at the platinum electrode-mixture interface, and a Warburg impedance term describing diffusion effects at low frequencies. The fits were excellent, and one parameter in particular emerged as the star of the show: the bulk resistance, measured at frequencies above 15 kilohertz, which tracks the total mineral content of the honey, including potassium, the predominant cation, along with cadmium, lead, chromium, manganese, iron, nickel, copper and zinc.

That mineral link explains everything the team observed. The bulk resistance of the pure honeys followed a clear sequence, with acacia honey highest, followed by lavender, citrus, thyme, lime and chestnut, while mineral content varied in the inverse order, exactly as earlier studies had reported. The beet sugar syrup itself, essentially mineral-free, showed a bulk resistance of 181,830 ohms when diluted, so every addition of syrup dilutes the honey’s mineral load and pushes the resistance upward. Crucially, the relative change in bulk resistance varied linearly with the beet sugar percentage across the 0 to 50 percent range for all six honeys. Sensitivity was highest for lime honey, rich in minerals, and lowest for acacia, which starts out mineral-poor. Measurements repeated five times yielded relative standard deviations between 3 and 7.5 percent, and the calculated detection limit, derived from the standard expression three sigma over sensitivity, came out at just 3.3 percent saccharose syrup, with a quantification limit of 10 percent.

Set against the competition, that figure is impressive. EIS outperforms fluorescence by a factor of nearly five, beats the isotope ratio method by a wide margin, and edges past FTIR, falling short only of HPLC’s 2.5 percent threshold, a technique that requires far more expensive equipment and considerably more time per sample. The authors argue that the linear correlation between bulk resistance and syrup percentage provides a quantitative electrochemical signature of adulteration, one that can distinguish genuine honey from doctored samples with high sensitivity and reproducibility. Because the measurement is non-destructive, rapid and inexpensive, it could plausibly be implemented in quality control laboratories and even industrial production lines, and earlier work has already demonstrated a portable prototype based on a microcontroller and low-cost immersion electrodes for monitoring sugar adulteration.

The broader implications stretch beyond the honey jar. Food fraud is a multi-billion-dollar global problem, and the tools that catch it need to be fast, cheap and deployable outside specialized labs. This study shows that a technique requiring little more than a pair of platinum electrodes, a modest potentiostat and a fitting algorithm can deliver detection limits rivaling chromatography. The method’s dependence on mineral content is both its strength and its caveat: sensitivities vary with botanical origin, so calibration against each honey type matters. Still, as the authors conclude, the ease of implementation and sensitivity of EIS make it a promising approach for routine quality control in the honey industry and a potential reference point for broader applications in food fraud detection. The next time you drizzle honey on your toast, there may be a small electrical circuit standing guard between you and the counterfeiters.

Subject of Research: Detection of sugar syrup adulteration in honey using electrochemical impedance spectroscopy

Article Title: Electrochemical impedance spectroscopy for detecting honey adulteration by sugar syrup

Article References: Halima, H. B., Sezgintürk, M. K., & Jaffrezic-Renault, N. (2026). Electrochemical impedance spectroscopy for detecting honey adulteration by sugar syrup. Discover Electrochemistry, 3(1), Article 36. https://doi.org/10.1007/s44373-026-00126-1

Image Credits: AI Generated

DOI: 10.1007/s44373-026-00126-1

Keywords: honey adulteration, electrochemical impedance spectroscopy, food fraud, sugar syrup, food safety, bulk resistance, Randles circuit, beet sugar, honey authentication, quality control, Nyquist plot, mineral content

The logic behind the experiment is straightforward but compelling. Fish already supplies nearly 20 percent of the animal protein consumed by about 3.1 billion people worldwide, and fish protein is widely considered superior to that of meat or eggs because of its balanced essential amino acid composition, its payload of micronutrients, and its low burden of saturated fat. Yet fish remains underconsumed in many communities because it is perishable, spoils quickly, and its sensory properties put off some eaters, particularly young people. Bread, by contrast, is affordable, ubiquitous, and beloved in developing tropical countries, where cereal crops can contribute roughly 75 percent of total caloric intake. But bread is nutritionally lopsided: rich in carbohydrates and fiber, it falls short on protein and minerals, and its high carbohydrate load has been linked to obesity, type 2 diabetes, cardiovascular disease, and colon cancer. Both the FDA and the WHO recognize bread as an effective vehicle for nutrient enrichment, making it an ideal carrier for a protein boost.

Silver carp, a fast-growing invasive species farmed extensively across Asia, was an obvious candidate. The research team purchased fresh fish averaging 1.92 kilograms from the Boro Bazar market in the Jashore district, filleted the animals, separated the flesh from bones and fins, minced it, dried it for 12 hours at 65 degrees Celsius in a hot air oven, and ground the dried mince into a powder that was stored at minus 20 degrees Celsius until use. They then prepared four bread formulations following a modified Stokić method: a control loaf made purely from refined wheat flour, and three experimental loaves in which 5, 10, or 15 percent of the wheat flour by weight was replaced with silver carp powder. Each 84-gram batch of flour-plus-powder was combined with salt, yeast, sugar, vegetable oil, and water, kneaded for 20 minutes, rested for 30 minutes at room temperature, shaped, and baked for about 20 minutes at 180 degrees Celsius.

The nutritional results were striking and followed a clean dose-response pattern. Protein content climbed from 15.18 percent in the control bread to 18.51 percent at 5 percent substitution, 21.8 percent at 10 percent, and 24.60 percent at the 15 percent level. Lipid content rose in parallel, from 6.44 percent to 9.17 percent, as the fish powder—whose own lipid content has been reported at 13.65 percent—diluted the starch-rich flour. Carbohydrate, predictably, fell from 65.02 percent to 53.27 percent across the same range. Moisture content, hovering between 10.13 and 10.95 percent, did not vary significantly, and the authors note that such low moisture bodes well for shelf life, since food stability generally declines as moisture rises. Ash content, a proxy for total mineral content, stayed essentially flat at around 2.3 to 2.4 percent, an unexpected result that contrasts with some earlier studies using salmon or tilapia powders.

Energy values increased significantly with fortification, peaking at 394.50 kilocalories per 100 grams in the 10 percent loaf versus 378.76 in the control, driven by the denser protein and lipid contributions. But the most dramatic nutritional upgrade appeared in the amino acid analysis, performed with a Hitachi LA 8080 amino acid analyzer after acid hydrolysis of the samples. Total amino acids nearly doubled, from 11,346.41 milligrams per 100 grams in control bread to 20,588.98 milligrams per 100 grams in the 15 percent loaf. Methionine was the most abundant amino acid in every formulation, rising from 3,429.84 to 5,825.01 milligrams per 100 grams, while phenylalanine reached 5,217.79 milligrams and cystine climbed significantly above control levels. Valine was least abundant but still rose steadily with fish content. The authors note that tryptophan could not be measured because it is destroyed during acid hydrolysis, and that without performic acid oxidation the methionine and cystine values may be slightly underestimated—honest caveats that do not blunt the overall picture.

This amino acid enrichment matters because wheat flour is notoriously limited in essential amino acids, and fish protein carries a more optimal essential amino acid profile than plant proteins. Adequate intake of indispensable amino acids such as lysine and methionine is critical for childhood growth, cognitive development, immune function, and the prevention of stunting, while balanced amino acid nutrition in adults helps maintain muscle mass and metabolic health. In regions where protein-energy malnutrition and poor dietary diversity persist, fortifying a staple that people already eat every day with a cheap, locally available fish could be a cost-effective public health strategy. The researchers explicitly frame the fortified bread as a potential tool against malnutrition in developing regions, where silver carp aquaculture is already well established.

Mineral analysis by inductively coupled plasma optical emission spectrometry reinforced the case. Sodium more than doubled, from 5.33 to 11.57 milligrams per 100 grams, and calcium rose from 7.88 to 18.73 milligrams per 100 grams at the highest fortification level. Zinc increased from 1.95 to 2.89 milligrams and iron from 1.63 to 1.95 milligrams per 100 grams. Calcium plays essential roles in bone integrity and blood pressure regulation, and adequate intake has been associated with reduced risks of hypertensive disorders in pregnancy and lower LDL cholesterol. Just as importantly, the heavy metal screen was reassuring: cadmium, arsenic, copper, and lead all remained far below international safety limits, chromium stayed under the FAO/WHO guideline of 0.1 milligrams per 100 grams, and nickel, though elevated to 0.05 milligrams in some loaves, remained well within the tolerable daily intake of 0.3 milligrams per day.

Nutrition, however, is worthless if nobody eats the bread, and this is where the story gets nuanced. A sensory panel of fifty untrained but regular fish consumers, aged 22 to 40, rated the loaves on color, flavor, softness, chewiness, and overall acceptability on a ten-point scale. The control bread scored highest across all attributes, and sensory quality declined progressively as fish powder levels rose. The 5 percent loaf tracked the control closely, particularly in color and flavor, while the 10 percent loaf showed moderate reductions, mainly in chewiness and flavor. The 15 percent loaf fared worst, earning the lowest marks in every category, especially color and overall acceptability. Instrumental color measurement told a parallel story: lightness, redness, and yellowness values all fell with increasing fish content, producing a dark brown crumb at 15 percent substitution. The culprit is the Maillard reaction, in which reducing sugars react with amino acids, particularly lysine, during baking to form brown pigments and flavor compounds; higher protein content means more reactants and darker bread.

The pH of the loaves also shifted subtly toward neutrality with fish content, from 6.24 in the control to 6.37 at 15 percent substitution, a change the authors attribute to the buffering capacity of fish muscle proteins and their abundant alkaline amino acids such as lysine. A pH closer to neutral may even be gentler on the stomach for people with acid sensitivity. Taken together, the data point to a practical sweet spot: breads fortified with 5 to 10 percent silver carp powder scored nearly as well as plain bread in taste, aroma, texture, and overall acceptability while delivering substantially more protein, amino acids, and minerals. The authors suggest that 10 percent is the viable balance between functional benefit and consumer acceptance, and they recommend gradually introducing fish powder at levels that do not alter taste or texture, combined with consumer education and sensory-optimized product development.

The study is not without limitations, which the authors candidly acknowledge. No storage stability trials, microbial analyses, or lipid oxidation assessments were conducted, so the shelf-life behavior of the fortified bread remains unknown. Fish lipids are prone to rancidity, and how the loaf holds up over days of storage could determine whether the concept survives outside the laboratory. Still, the core finding stands: an abundant, low-value fish can be converted into a shelf-stable powder that transforms one of humanity’s most common foods into a significantly better protein source. As aquaculture expands and the search for sustainable, affordable nutrition intensifies, the idea of a fish-fortified loaf—hiding a dose of complete protein inside an everyday slice—may prove one of the more quietly revolutionary developments in food science.

Subject of Research: Nutritional and sensory evaluation of wheat bread fortified with silver carp fish powder

Article Title: Fortification of bread with silver carp ( Hypophthalmichthys molitrix ) fish powder: Effects on nutritional composition and sensory attributes

Article References: Maria, S. J., Antu, M. A. R., Ahmed, M. T., Choudhury, M., Mondal, S., Rahman, M. A., & Haq, M. (2026). Fortification of bread with silver carp (Hypophthalmichthys molitrix) fish powder: Effects on nutritional composition and sensory attributes. Heliyon, 12(15), Article e45460. https://doi.org/10.1016/j.heliyon.2026.e45460

Image Credits: AI Generated

DOI: 10.1016/j.heliyon.2026.e45460

Keywords: silver carp, bread fortification, food science, protein enrichment, amino acids, malnutrition, functional foods, mineral content, sensory evaluation, aquaculture, Heliyon, Bangladesh