IMBIV   05474
INSTITUTO MULTIDISCIPLINARIO DE BIOLOGIA VEGETAL
Unidad Ejecutora - UE
congresos y reuniones científicas
Título:
Chemical composition and antioxidant activity of Laurus nobilis essential oil and its fractions
Autor/es:
LAMBIR, J.; QUIROGA, P. R.; GROSSO N. R.
Lugar:
Chicago
Reunión:
Congreso; IFT Annual Meeting - 2018; 2018
Institución organizadora:
Institute of Food Technologists
Resumen:
IntroductionLaurel essential oil (LEO) of laurel has shown antioxidant activity. Fractions separated from the essential oil by short-path molecular distillation that concentrate determined compound could have greater antioxidant activity. The objective of this study was to analyse the chemical composition and antioxidant activity of fractions, distillate (DL) and residue (RL), prepared by short-path molecular distillation.Method The EOL fractions were separated by molecular distillation. The chemical composition of the LEO and its fractions was determined by CG-MS. DPPH, total phenolic content (TPC) and ABTS were analyzed to estimate the antioxidant activity of EOL, DL and RL. The following samples were prepared: canola oil (CO-C) as control sample, and canola oil with addition of BHT (CO-BHT), EOL (CO-EOL), DL (CO-DL), and RL (CO-RL) for an accelerated oxidation test (50 storage days, 45 C). Peroxide value (PV) and conjugated dienes (CD) values were measured on samples. Statistical analysis: ANOVA and Fisher­LSD.ResultsThe major components were eucalyptol (58.75%), −terpinyl acetate (8.61%) and sabineno (7.84%) in LEO; eucalyptol (61.79%), −pinene (16.33%) and ocimene (5.81%) in DL; and −terpinyl acetate (19.73%), eucalyptol (18.88%) and camphene (18.33%) in RL. DPPH-IC50 value was 0.43, 0.33 and 0.14 mg/ml in EOL, DL and RL, respectively. ABTS values were 2.61, 1.28 and 4.46 in EOL, DL and RL, respectively. TPC value was 7.45, 4.10 and 15.05 ug/mL in EOL, DL and RL, respectively. Chemical indicators increased during storage in all canola oil samples. After 50 days of storage PV was 56.70, 41.71, 58.92, 44.64 and 45.02 mEq O2/Kg in CO-C, CO-BHT, CO-EOL, CO-DL and CO-RL, respectively. CD value at storage day 50 was 7.40, 4.51, 7.55, 6.73 and 5.25% in CO-C, CO-BHT, CO-EOL, CO-DL and CO-RL, respectively. DL and RL show better antioxidant behaviour than the EOL. In general, RL has a little a better antioxidant than DL.