Antioxidative activity of sage (Salvia officinalis L.), savory (Satureja hortensis L.) and borage (Borago officinalis L.) extracts in rapeseed oil

Abstract

Antioxidative activity of sage (Salvia officinalis L.), savory (Satureja hortensis L.) and borage (Borago officinalis L.) extracts in rapeseed oilThe antioxidant activity (AA) of acetone oleoresins (AcO) and deodorised acetone extracts (DAE) of sage (Salvia officinalis L.), savory (Satureja hortensis L.) and borage (Borago officinalis L.) were tested in refined, bleached and deodorised rapeseed oil applying the Schaal Oven Test and weight gain methods at 80°C and the Rancimat method at 120°C. The additives (0.1 wt-%) of plant extracts stabilised rapeseed oil efficiently against its autoxidation; their effect was higher than that of the synthetic antioxidant butylated hydroxytoluene (0.02%). AcO and DAE obtained from the same herbal material extracted a different AA. The activity of sage and borage DAE was lower than that of AcO obtained from the same herb, whereas the AA of savory DAE was higher than that of savory AcO. The effect of the extracts on the oil oxidation rate measured by the Rancimat method was less significant. In that case higher concentrations (0.5 wt-%) of sage and savory AcO were needed to achieve a more distinct oil stabilisation.

Octyl sinapate as a new antioxidant to improve oxidative stability and antioxidant activity of rapeseed oil during accelerated storage

“…The effectiveness of different natural antioxidants present in plants, fruits, vegetables, cereals, seaweeds, macroalgae, essential oils, and by-products for the stabilization of rapeseed oils had been recently estimated [4][5][6][7][8][9][10][11][12][13][14][15]. The protective effect of these natural antioxidants in stabilizing rapeseed oils was evaluated by determining their peroxide values (PV), p-anisidine values (AV), carbonyl values, thiobarbituric acid-reactive substances (TBARS value), conjugated dienes (CD) and conjugated trienes (CT) amounts, TOTOX index, oxidative stability (Rancimat test), antioxidant activity (AA), total phenolic content (TPC), and amounts of volatile compounds during practical and accelerated storage conditions [4][5][6][7][8][9][10][11][12][13][14][15]. The addition of different plant extracts to rapeseed oils revealed efficacy in delaying both primary and secondary oxidative changes (PV = 0-450 and 0-350 meq O 2 kg −1 , CD = 0.3-22.5 and 0.…”

“…The addition of different plant extracts to rapeseed oils revealed efficacy in delaying both primary and secondary oxidative changes (PV = 0-450 and 0-350 meq O 2 kg −1 , CD = 0.3-22.5 and 0. [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20].0, AV = 3.4-216.9 and 3.4-160.3, CT = 1.1-4.8 and 1.1-4.5, TOTOX = 8.6-1049.6 and 8.6-924.7, induction period = 3.8-53.9 and 4.3-135.0 h for control and enriched oils, respectively) during storage under oxidation conditions [5,[8][9][10][11][12]14].…”

“…However, CD levels in rapeseed oil treated with sage, savory, and borage extracts at 80 °C for 85 h were higher than in oil without antioxidants [5].…”

Current developments in interim transport (storage) media in dentistry: an update

“…The pressure increases, the density, witch commands the solvating power, increases too, but slowly [23]. Figure 3 showed the amount of oxygenated and hydrocarbons compounds at different pressures studied.…”

“…Supercritical fluid extraction (SFE) is an interesting technique to resolve the problem occurred by the hydrodistillation, and different study have been reported in the literature [15][16][17][18][19]. Concerning the antioxidants properties of sage [20][21][22][23] the different studies developed in the literature conclude that the top of the aerial part contribute mainly to the antioxidant activity. The aims of our study were: (i) to determine the chemical composition of essential oils of Salvia officinalis collected from Tunisia, extracted by hydrodistillation and supercritical fluid extraction (SFE); (ii) to investigate the antioxidant properties of essential oils using the DPPH free radical method [24,25]; (iii) to conclude on the capacity for the Tunisia to product essential oil from sage with the best antioxidant activity.…”