The motivation behind the work stems from a growing unease within the food industry about the additives long used to keep processed meats from going rancid. Synthetic antioxidants such as butylated hydroxyanisole (BHA) and butylated hydroxytoluene (BHT) work by stabilizing free radicals and thereby slowing lipid oxidation, the chemical cascade that turns fats stale and unpalatable. Yet BHA has been classified by the U.S. National Toxicology Program as reasonably anticipated to be a human carcinogen, and recent network toxicology analyses have suggested potential liver, kidney, and nerve toxicity associated with both compounds. As consumers increasingly demand clean-label products, food scientists have turned to plant materials rich in bioactive compounds, including buckwheat, green tea, and licorice, in search of safer preservative strategies.

Magnolia denudata emerged as a promising candidate because its flowers are packed with polyphenols and flavonoids, two families of plant secondary metabolites renowned for their ability to quench reactive radicals. The blossoms also contain distinctive phenolic compounds such as rutin, chlorogenic acid, magnolol, and honokiol, which previous research has linked to antibacterial, anti-inflammatory, and antioxidant activity. To prepare the extract, the team harvested fully bloomed flowers in April 2024 from trees on the Chungbuk National University campus, dried them at room temperature, and soaked them in an 80 percent ethanol solution for one week in a shaking water bath at 37 degrees Celsius. After filtration, vacuum concentration, and freeze-drying, the process yielded a dry extract at 5.33 percent of the original flower weight, with a coefficient of variation below 2 percent across three independent batches.

Laboratory characterization confirmed the extract’s potency. In the DPPH radical scavenging assay, a standard test in which a stable purple radical turns yellow upon neutralization by antioxidants, the extract achieved a scavenging rate of 44.48 percent. That figure compares favorably with other edible spring flowers, exceeding forsythia at 40.4 percent and rhododendron at 34.5 percent, and narrowly outperforming cherry blossom at 43.3 percent. The extract contained 132.91 milligrams of gallic acid equivalents per gram in total polyphenols and 42.44 milligrams of naringin equivalents per gram in total flavonoids, values consistent with earlier analyses of the species and pointing to a dense concentration of the molecular machinery responsible for radical interception.

With the extract characterized, the researchers formulated emulsified chicken breast sausages containing ground chicken, pork backfat, ice, salt, and sugar, adding the freeze-dried extract powder at 0.1, 0.15, and 0.2 percent by weight. A negative control received no additives, while a positive control contained 0.1 percent ascorbic acid, a well-established antioxidant benchmark. The emulsions were stuffed into tubes, cooked in an 80 degree Celsius water bath for 30 minutes, and stored under refrigeration at 4 degrees Celsius for two weeks while the team tracked an array of quality indicators, from proximate composition and color to pH, lipid oxidation, and protein breakdown.

The proximate analysis revealed a clear concentration-dependent pattern. Sausages containing the extract held significantly more moisture than either control, with moisture rising as the dose increased from 0.1 to 0.2 percent. The researchers attribute this to insoluble dietary fibers such as cellulose and lignin in the flower material, which bind water within the emulsion matrix. Correspondingly, protein content declined relative to the untreated control, an effect the authors liken to earlier observations with mustard powder, where fiber-driven moisture gain dilutes the relative protein fraction. Fat and ash contents shifted only modestly, with the highest-dose group showing the lowest fat percentage, likely a dilution effect of its greater water content.

Two processing metrics told perhaps the most commercially compelling story. Cooking yield, the proportion of weight retained after heat treatment, ranged from 82.81 to 86.26 percent and was significantly higher in every extract-treated group than in either control, climbing steadily with concentration. Water-holding capacity followed a similar trajectory, with the 0.15 and 0.2 percent groups significantly outperforming the untreated control. The mechanism, the researchers suggest, is twofold: the insoluble fibers physically trap water, while the abundant polyphenols inhibit protein oxidation, preserving the structural integrity of the meat matrix and its ability to bind moisture. For manufacturers, higher yields and better water retention translate directly into reduced cooking losses and juicier products.

During refrigerated storage, the extract’s preservative effects became even more pronounced. Thiobarbituric acid reactive substances, or TBARS, the standard proxy for fat oxidation measured as malonaldehyde equivalents, were significantly lower in all extract-treated sausages than in the untreated control at every time point, with the 0.2 percent group showing the slowest rise over the two weeks. Volatile basic nitrogen, a marker of protein degradation driven by microbial activity, was also significantly reduced in the highest-dose group throughout storage. The authors point to the flower’s essential oil chemistry as a plausible explanation: previous analyses identified 3-carene, comprising 77.07 percent of magnolia flower oil, as active against spoilage bacteria such as Brochothrix thermosphacta and Pseudomonas fluorescens, while beta-elemene shows effectiveness against foodborne pathogens including Staphylococcus aureus. Slower microbial growth means fewer alkaline amines and ammonia compounds, which in turn kept pH values more stable in the treated sausages than in the controls.

Color measurements added nuance to the picture. Redness increased with extract concentration, consistent with the pigmented nature of polyphenols and flavonoids, while lightness was lowest in the mid-dose group. Yellowness rose in the lower-dose treatments, likely reflecting the extract’s inherent brownish hue, though the 0.2 percent group showed no significant difference from the untreated control, an optical effect the authors attribute to pigment dilution by the higher moisture content. A trained sensory panel of ten evaluators, however, flagged a trade-off at the highest dose: bitterness scores climbed with concentration, consistent with the known astringency of concentrated polyphenols, and overall preference was lowest for the 0.2 percent sausages. The ascorbic acid control retained the highest overall acceptability, while the 0.1 and 0.15 percent treatments scored in between.

The findings position Magnolia denudata extract as a functional, natural antioxidant capable of enhancing cooking yield, water retention, and oxidative and microbial stability in emulsified chicken products, with 0.2 percent emerging as the most effective functional dose. The remaining challenge is sensory: preserving the extract’s preservative benefits while tempering the bitterness that concentrated polyphenols impart. The authors suggest that future formulation strategies, perhaps blending the extract with masking ingredients or adjusting processing techniques, could reconcile function with flavor. As meat consumption in South Korea continues its climb toward a projected 60 kilograms per person by 2027, and as regulators and consumers alike push industry away from synthetic additives, a springtime flower long prized for its perfume may find a second career quietly protecting the sausages in the refrigerated aisle.

Subject of Research: Use of Magnolia denudata flower extract as a natural antioxidant to improve quality and storage stability of emulsified chicken sausages

Article Title: Effects of Magnolia denudata extract on quality and storage characteristics of emulsified chicken sausage

Article References: Ku, B., Kim, M., Kang, J., Han, H., Park, G., Lee, S.-H., & Choi, J. (2026). Effects of Magnolia denudata extract on quality and storage characteristics of emulsified chicken sausage. Food Science of Animal Resources, 46(1), Article 70. https://doi.org/10.1007/s44463-025-00026-9

Image Credits: AI Generated

DOI: 10.1007/s44463-025-00026-9

Keywords: Magnolia denudata, natural antioxidants, chicken sausage, lipid oxidation, TBARS, volatile basic nitrogen, polyphenols, flavonoids, water-holding capacity, cooking yield, food preservation, meat science