Maillard reaction products inhibit the periodontal pathogen Aggregatibacter actinomycetemcomitans by chelating iron

Lysine-Derived Maillard Reaction Products Inhibit the Growth of Salmonella enterica Serotype Typhimurium

An emerging consumer trend to purchase minimally heated and ready-to-eat food products may result in processing methods that do not effectively reduce pathogenic populations. Crude Maillard reaction products (MRPs) are naturally generated compounds that have been shown to display antimicrobial effects against pathogens. Crude MRPs were generated from reducing sugars (fructose (Fru), glucose (Glc), ribose (Rib) or xylose (Xyl)) with lysine and the melanoidin equivalence was measured using an absorbance of 420 nm (Ab₄₂₀). The relative antimicrobial activity of each MRP was measured by examining both the length of lag phase and maximum growth rate. MRPs were found to significantly shorten the lag phase and decrease the maximum growth rate of S. Typhimurium (p < 0.05). Glucose-lysine MRP (GL MRP) was determined to have the highest relative melanoidin (1.690 ± 0.048 at Ab₄₂₀) and its efficacy against S. Typhimurium populations was measured at 37 °C and at pH 7.0 and estimated on xylose lysine deoxycholate (XLD) agar. GL MRP significantly reduced S. Typhimurium populations by >1 log CFU/mL at 8 and 24 h after inoculation (p < 0.05). GL MRPs also further decreased S. Typhimurium populations significantly under thermal stress condition (55 °C) compared to optimal (37 °C) by ~1 log CFU/mL (p < 0.05). Overall, GL MRP demonstrated effective antimicrobial activity against S. Typhimurium at 37 °C and 55 °C.

Development of meat flavors in peony seed-derived Maillard reaction products with the addition of chicken fat prepared under different conditions

To prepared Maillard reaction products (MRPs) enriched with chicken flavor, the effects of chicken fats on peony seed-derived MRPs were evaluated. The thermal treatments, lipase enzymatic hydrolysis and lipoxygenase with subsequent mild thermal treatments were applied to oxidized chicken fats before their use in the Maillard reaction. Different oxidized chicken fats led to diverse chemical properties and varied volatile compounds. The addition of oxidized chicken fat increased the meaty of MRPs. The chicken fat promoted the Maillard reaction, which produced more oxygenated compounds; however, it reduced the sulfur compounds. Correlation analysis of the chemical properties of chicken fat and the major volatile compounds showed that by controlling the chemical properties of chicken fat, it might be possible to control the content of some volatile compounds of chicken fat and MRPs. Our data elucidated that chicken fat contributes to the development of meat flavors after oxidation and thermal treatments.