IMBIV   05474
INSTITUTO MULTIDISCIPLINARIO DE BIOLOGIA VEGETAL
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Antioxidant activity of monoterpenes and synergist antioxidant effect with BHT
Autor/es:
QUIROGA PR; ASENSIO CM; LARRAURI M; MARTIN MP; RIVEROS CG; GROSSO NR; NEPOTE V
Lugar:
Cordoba
Reunión:
Jornada; I Jornada del ICTA; 2015
Institución organizadora:
FCEFyN-UNC
Resumen:
Synthetic antioxidants are used in many foods. Their health safety is questioned. Monoterpenesobtained from essential oils have shown antioxidant activity. The objective of this study was to evaluate the preserving effect of monoterpenes: thymol, carvacrol, and sabineno hydrate acting as antioxidant additives.The antioxidant activity of monoterpenes were evaluated in a storage study of roasted sunflower seeds. The following samples were prepared: roasted sunflower seeds (RS-C) as control sampleand roasted sunflower seeds with addition of BHT (RS-BHT) and thymol (RS-T), carvacrol (RS-Car), and sabinene hydrate (RS-S) monoterpenes. Samples were stored during 35 days at room temperature. Peroxide (PV) and p-anisidine (AV) values were measured every 7 days. The synergist antioxidant effect between monoterpenes and BHT was evaluated in canola oilstored during 14 days at 60 ºC. A binary combination of each monoterpene with BHT (0:100, 20:80, 40:60, 60:40, 80:20, and 100:0, monoterpene:BHT) were prepared and added to canola oil at 0.02% w/w. PV value was measured in all canola oil samples. Statistical analysis was performed on the data (ANOVA and Fisher-LSD test).Chemical indicators increased during storage in roasted sunflower seed samples. After 35 days of storage, PV value was 27.74, 58.05, 89.12, 98.95, and 145.35 meq O2/Kg in RS-BHT, RS-S, RS-T, RS-Car, and RS-C, respectively. The AV at storage day 35 was 2.71, 5.95, 5.45, 6.48, and 9.05 in RS-BHT, RS-S, RS-Car, RS-T, and RS-C, respectively. A synergist antioxidant effect was observed in the combinations 20:80 between the monoterpenesthymol and sabinene hydrate with BHT (lowest PV in canola oil samples). Carvacrol:BHT combinations did not have synergist effect. Thymol and sabinene hydrate exhibited better antioxidant effect in roasted sunflower seeds and show synergist antioxidant effectwith BHT in canola oil. Monoterpenes as thymol, carvacrol and sabineno hydrate can be used as natural antioxidant in food products.The shelf-life of a food product could be prolonged by the addition of natural preservatives as monoterpenes or combining these natural antioxidant with BHT to increase the antioxidant property for a synergistic effect. The addition of monoterpenes preserve longer the quality of lipid in roasted sunflower seeds during storage. The addition of monoterpenes should be considered for the food industry as an alternative of natural antioxidant for preserving quality properties in food products.