Wheat bran extracts: a potent source of natural antioxidants for the stabilization of canola oil (original) (raw)
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Lwt - Food Science and Technology, 2007
Antioxidant activity of bran extracts from five wheat varieties indigenous to Pakistan, i.e. Punjab-96, Bhakkar-2002, Uqab-2000, SH-2002, has been evaluated. All the bran extracts exhibited appreciable total phenolic content (2.12-3.37 mg gallic acid equivalent/g bran), total flavonoid content (epicatechin equivalent 262-304 mg/g bran), chelating activity (ethylenediaminetetracetate equivalent 597-716 mg/g bran), 2,2 0 -diphenyl-1-picrylhydrazyl radical scavenging activity (51-79%), ABTS radical cation scavenging activity (Trolox equivalent 27-36 mmol/g), oxygen radical absorbance capacity (97-123 mmol/g), and total anthocyanin content (30-38 mg/kg bran). Tocopherol (22-26 ppm) and tocotrienol content (59-74 ppm) were determined by RP-HPLC. For confirmation of tocopherol content, polarographic study was conducted, which further authenticated the results (21-25 ppm). All the varieties exhibited appreciable antioxidant potential and significant differences were observed among the varieties in different systems of antioxidant activity evaluation.
Canola extract as an alternative natural antioxidant for canola oil
Journal of the American Oil Chemists’ Society, 1994
The antioxidative activity of ethanolic extracts of canola meal at 100, 200, 500 and 1000 ppm on refined-bleached (RB) canola oil was examined and compared with commonly used synthetic antioxidants, such as butylated hydroxyanisole (BHA), butylated hydroxytoluene (BHT), BHA/BHT/monoglyceride citrate (MGC) and tert-butylhydroquinone (TBHQ). Stability of RB oil was monitored under Schaal oven test conditions at 65~ over a 17-d period. Progression of oxidation was monitored by weight gain, peroxide, conjugated diene, 2-thiobarbituric acid and total oxidation values. Canola extracts at 500 and 1000 ppm were more active than BHA, BHT and BHA/BHT/MGC and less effective than TBHQ at a level of 200 ppm.
Wheat is one of the most important grain and dietary fiber across the worldand majority of its valuable antioxidant compounds are present in the germ/bran fractions.Wheat bran,by-product of wheat milling industry, holdsmany nutritionally beneficial phytochemicals with antioxidant properties. The current study was to investigate the total phenolic content, tocopherol content, and carotenoid profile for the phytochemical composition of wheat bran. DPPH free radical scavenging test was also performed for the measurement of antioxidant activity of wheat bran extract.For qualitative phytochemical screening, some chemicals standard tests were done which showed the presence of tannin and polyphenols, flavonoid, and saponin in the extract.In quantitative determination, total phenolic content (TPC) in methanolic extract weredetermined as8.97% of gram equivalent of gallic acid.Here we studied a high-performance liquid chromatography (HPLC) technique for the determination of the content of tocopherols and carotenoid in the extract. In this study the concentration of ?-carotene in bran sample was 0.11µg/gmand value of tocopherol was 1.77µg/gm. The extract showed the presence of bio-active components which are kinetically active scavenger against DPPH under the testing conditions and accountable for the antioxidant activity.Results indicated that the wheat bran extract have potentials for serving as dietary sources of natural antioxidants and phenolic acids, and may contribute to total dietary tocopherols and carotenoids.
Journal of Food Lipids, 2006
Kernel) prepared using a number of solvents (100% methanol, 80% methanol, 100% acetone and 80% acetone) were evaluated in sunflower oil (SFO) under accelerated storage conditions. The crude concentrated extracts of rice bran were added at 600 mg/kg into refined, bleached and deodorized SFO samples and stored under accelerated (65C) conditions for 24 days. Analyses were done every 4 days, and the extent of oxidative deterioration was followed by measurement of activity index, peroxide, p-anisidine, and conjugated diene and triene values. The overall order of antioxidant efficacy of rice bran extracts as determined by various antioxidant assays was 80% methanolic extract, >100% methanolic extract, >80% acetone extract and >100% acetone extract. The antioxidant activity of rice bran extracts might be attributed to the presence of phenolics and high contents of tocopherol. The results of the present comprehensive analysis demonstrated that extracts of the rice bran of Super Kernel, an indigenous cultivar of Pakistan, are a viable source of natural antioxidants and might be exploited for functional foods and nutraceutical applications.
Probing the effect of physical modifications on cereal bran chemistry and antioxidant potential
Journal of Food Measurement and Characterization, 2020
Bran is the highly nutritious protective covering of cereal grains. Important health-benefitting compounds like dietary fiber, phenolics and antioxidants, vitamins and minerals are found in bran in good proportions. However, bran is discarded as a byproduct in milling operations and not used in substantial quantities in human foods because of some technical problems. Modification of cereal brans can improve their technological aspects and utilization in end-products. In this project, brans from seven cereals (wheat, barley, millet, sorghum, rice, oat and corn) were physically modified. The techniques included soaking, autoclaving and dry heat treatment. The effects of these modifications on chemical and antioxidant composition of bran were evaluated. Dry heat treatment improved the fiber content while a decreasing trend for TPC, TFC and antioxidant activity was observed. Highest TPC and TFC were observed in native sorghum (0.58 ± 0.01 mg GAE/g) and native millet bran (214.09 ± 0.16 µg QE/g) respectively. Antioxidant activity assayed by DPPH analysis was also highest in native millet bran (86.83 ± 0.05% inhibition). Tannins were highest in rice bran (182.85 ± 0.51 mg/100 g). Rice and corn bran had highest quotients of phytic acid as 6.35 ± 0.13 and 6.13 ± 0.15 g/100 g respectively. Modification treatments particularly dry heat treatment was effective in lessening the anti-nutritional factor.
Grasas Y Aceites, 2011
190 in a linoleic acid system, total phenolic contents (TPC) and bleachability of -carotene in the linoleic acid system. Additionally, the canola oil samples were stabilized with crude concentrated extracts and subjected to ambient aging (6 months). The extent of oxidative deterioration was followed by the measurement of peroxide-, p-anisidine-, conjugated dienes-, and trienes-values. The results of ambient stored samples revealed a significant improvement in these oxidation parameters. The overall order of antioxidant activity of the extracts as determined by various antioxidant assays was determined to be; 80% methanolic extract . 100% methanolic extract . 80% acetone extracts . 100% acetone extract. The results of the present comprehensive analysis demonstrate that extracts of the wheat bran indigenous to Pakistan are a viable source of natural antioxidants and might be exploited for commercial and neutraceutical applications.
Canola Seed Meal as a Potential Source of Natural Antioxidant
Alexandria Science Exchange Journal
In the present study seeds of Brassica napus L. (canola) and its defatted meal were utilized separately in order to obtain methanol extract which used after lyophilization for total phenols content (TPC), total flavonoids (TF) and α-Tocopherol contents, antioxidant activity determination and phenolic compounds profiling with HPLC. The results showed a high total phenols, total flavonoids and α-Tocopherol contents with superior antioxidant activity for canola meal extract (32% increase than seeds extract). The major phenolic compounds were Vanillic acid and Syringic acid with levels of 783.66 and 52.24 (µg/g extract); respectively, while, the major flavonoid compound was Rutin (631.13 µg/g extract). Scientific researches should be focused on the utilization of Canola seed meal (CM) as a potential natural source of such phytochemicals.
Effect of natural antioxidants on the stability of canola oil
Developments in Food Science, 1995
A preliminary study on the efficiency of agri-food industry wastes as stabilizers for polypropylene (PP) films is reported. Several analytical techniques were employed to evaluate the stabilization effectiveness of the additives. DSC and CL analysis performed on unaged samples confirmed the antioxidant activity of natural additives, and provided the following order of efficiency: red grape seeds > white grape seeds > tomato extracts. The films were also artificially aged at 70 C, and FTIR spectroscopy confirmed the stabilization trend obtained from the unaged films. Kinetic analysis of TG data alongside tensile tests indicated that the tomato extract is a good thermal and processing stabilizer, but it is sensitive to oxidation. In contrast, grape seeds provide long-term stabilization to PP under conditions of oxidative degradation. Our results show that tomato and wine processing by-products have good potential to be exploited as a low-cost source of value-added phytochemicals.