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Cherry (Prunus avium) phenolic compounds for antioxidant preservation at food interfaces

Basanta, Maria F., Rojas, Ana M., Martinefski, Manuela R., Tripodi, Valeria P., De’Nobili, Maria D., Fissore, Eliana N.
Journal of food engineering 2018 v.239 pp. 15-25
Lewis bases, Prunus avium, anthocyanins, antioxidant activity, color, coumaric acids, diffusivity, flavonols, pH, relative humidity, singlet oxygen, water content
Cherry phenolics extracted by 90°C-water were loaded in a low-methoxyl-pectin (LMP) film for antioxidant preservation. Dark red films (pH = 3.46) contained flavonols (dihydrokaempferol-glucoside, quercetin-3-O-rutinoside), hydroxycinnamic acids (neochlorogenic, chlorogenic, 3-p-coumaroylquinic acids), and anthocyanins (cyanidin-3-O-glucoside, cyanidin-3-O-rutinoside), with a 6.97 × 10−12 m2/s diffusion coefficient. Phenolics’ stability was studied at constant relative humidity (RH: 57.7; 75.2%) and 25.0 °C. The pseudo-first-order de gradation rate was the highest (t1/2 = 3-2 months) and increased with the equilibration RH in darkness for anthocyanins, with simultaneous red vanishing by water nucleophilic attack. Instead, flavonols remained stable (t1/2 >1.5 years). Light (75.2%RH) induced the highest phenolics-degradation-rates, especially for anthocyanins (t1/2 = 11d), sensitizer, and film red color. Flavonols-decay was the slowest (t1/2 = 7–12 months). Antioxidant capacity paralleled phenolics-content. Hydroxycinnamic acids followed by flavonols could scavenge the singlet oxygen. Light-triggered LMP-matrix―phenolic interactions were determined, producing the lowest film water content and deformability. Cherry phenolics stabilized as a colored film constituted a food preserving antioxidant barrier.