INVESTIGADORES
GROSSO Nelson
congresos y reuniones científicas
Título:
Antioxidant activity of monoterpenes and synergist antioxidant effect with BHT
Autor/es:
QUIROGA, P. R.; ASENSIO C.; LARRAURI, M.; MARTÍN, M. P.; RIVEROS C. G.; NEPOTE V.; GROSSO, N. R.
Lugar:
New Orleans
Reunión:
Congreso; IFT Annual Meeting - 2014; 2014
Institución organizadora:
Institute of Food Technologists
Resumen:
Synthetic antioxidants are used in many foods. Their
health safety is questioned. Monoterpenes obtained 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 sample and 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 oil stored 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 monoterpenes thymol and sabinene
hydrate with BHT (lowest PV in canola oil samples). Carvacrol:BHT combinations
did not have synergist effect. Thymol and sabinene hydrate exhibiten better antioxidant
effect in roasted sunflower seeds and show synergist antioxidant effect with
BHT in canola oil. Monoterpenes as thymol, carvacrol and sabineno hydrate can
be used as natural antioxidant in food products