In the present study, phenolic extracts and fractions from Canadian rowanberry (Sorbus aucuparia) and crabapple (Malus baccata) were screened for antioxidant activity using DPPH radical scavenging activity, and β-carotene bleaching assays. Furthermore, rapeseed oil was supplemented with extracts/fractions and performance was assessed during accelerated storage at 65°C, under Rancimat at 120°C, ...

In this study, the essential oil chemical compounds of rosemary (Rosmarinus officinalis L.) and its antioxidant activity on oxidation stability refined sunflower (RSO) were investigated by Rancimat method. The plant material was obtained from Afyonkarahisar Medicinal Aromatic Plants Center/Turkey. Based GC/FID-MS analysis result, 1,8-Cineole (15.18%), Camphor (11.39%), Borneol Germacrene D (11....

This work examines pressurized accelerated oxidation by a RapidOxy tester as an alternative method for determination of biodiesel stability. Sunflower oil-based was synthesized and treated with antioxidants: tert-butylhydroquinone (TBHQ) - synthetic antioxidant known its powerful protective effect, mixture bio-based compounds extracted from vinery waste, VWEeth. The potency TBHQ evaluated at va...

This study was performed to optimize and validate Rancimat (Metrohm Ltd., Herisau, Switzerland) operational parameters including temperature, air-flow, sample weight minimize Induction-Time (IT) IT-Coefficient-of-Variation (CV), using Response Surface Methodology (RSM). According a Box–Behnken experimental design, walnut oil equivalent 3-, 6-, or 9-g added each reaction vessel heated 100, 110, ...

This study aimed to evaluate the quality of selected oils from seeds herbs and vegetables (basil, fenugreek, coriander, tomato, garden cress, parsley, dill), especially their oxidative stability. The were tested for oxidation degree (acid value, peroxide p-anisidine TOTOX indicator, specific extinction under ultraviolet light), colours, content carotenoid chlorophyll pigments, fatty acid compos...

Rapeseed contains high amounts of phenolic compounds, mainly derivatives of sinapic acid, but only a small part can be found in virgin rapeseed oil, since the polar compounds remain in the press cake. A temperature treatment of the raw material results in the degradation of sinapic acid to 2,6dimethoxy-4-vinylphenol (vinylsyringol or canolol), which is described in literature as a very strong a...

The antioxidant properties of various fractions of a methanolic extract obtained from the aerial parts of Verbascum macrurum have been determined by monitoring their capacity to scavenge the stable free-radical DPPH. They were also evaluated as natural preservatives against oxidative rancidity using the accelerated Rancimat method. Their activities expressed as protection factor (PF(r)) indicat...

In this study was analyzed the effect of crop year and harvesting time on the fatty acid composition of cv. Picual virgin olive oil. The study was carried out during the fruit ripening period for three crop seasons. The mean fatty acid composition of Picual oils was determined. The oils contained palmitic acid (11.9%), oleic acid (79.3%), and linoleic acid (2.95%). The content of palmitic acid ...

The antioxidant and antimicrobial activity of methanol or dichloromethane extracts of O. dictamnus, produced from wild and organic cultivated specimens, were determined. The Rancimat and malondialdehyde (MDA) by HPLC methods were used to measure the antioxidant action, in comparison with that of the common commercial antioxidants butylated hydroxytoluene (BHT) and alpha-tocopherol. The extracts...