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A comparative study of tocopherols composition and antioxidant properties of in vivo and in vitro ectomycorrhizal fungi IPB - Escola Superior Agrária
Reis, Filipa S.; Ferreira, Isabel C.F.R.; Barros, Lillian; Martins, Anabela.
In aerobic organisms, the free radicals are constantly being produced during the normal cellular metabolism. The antioxidant properties of many organisms and particularly of wild mushrooms with their content in antioxidant compounds such as tocopherols, can detoxify potentially damaging forms of activated oxygen. Herein, a comparative study of tocopherols composition and antioxidant properties of in vivo (fruiting bodies) and in vitro (mycelia) ectomycorrhizal fungi: Paxillus involutus and Pisolithus arhizus. Tocopherols were determined by high performance liquid chromatography (HPLC) coupled to a fluorescence detector. The antioxidant properties were studied in terms of DPPH radical-scavenging activity, reducing power and inhibition of β-carotene...
Tipo: Article Palavras-chave: Paxillus involutus; Pisolithus arhizus; Fruiting bodies/mycelia; Tocopherols; HPLC-fluorescence; Antioxidant activity.
Ano: 2011 URL: http://hdl.handle.net/10198/3880
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Antioxidant activity of oils extracted from orange (Citrus sinensis) seeds Anais da ABC (AABC)
Jorge,Neuza; Silva,Ana Carolina da; Aranha,Caroline P.M..
Due to the increasing production of food in the world with consequent increase of the production of waste, the importance of developing researches for its use is noticed. Thus, the interest in vegetable oils with bioactive compounds, such as the ones extracted from fruit seeds, is growing. Therefore, the present study aims to characterize the oils extracted from seeds of Hamlin, Natal, Pera-rio and Valencia orange varieties (Citrus sinensis), as to the levels of total carotenoids, total phenolic compounds, tocopherols and phytosterols, as well as to determine their antioxidant activity. The orange seed oils presented important content of total carotenoids (19.01 mg/kg), total phenolic compounds (4.43 g/kg), α-tocopherol (135.65 mg/kg) and phytosterols...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Agro-industrial waste; Phytosterols; Tocopherols; Vegetable oils.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0001-37652016000300951
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Characterization of constituents, quality and stability of pomegranate seed oil (Punica granatum L.) Ciênc. Tecnol. Aliment.
MELO,Illana Louise Pereira de; CARVALHO,Eliane Bonifácio Teixeira de; SILVA,Ana Mara de Oliveira e; YOSHIME,Luciana Tedesco; SATTLER,José Augusto Gasparotto; PAVAN,Rosângela Torres; MANCINI-FILHO,Jorge.
Abstract This study aimed to characterize pomegranate seed oil and evaluate its quality and stability parameters against those of linseed oil. The profile of fatty acids and phytosterols and the content of tocopherols were analyzed by gas chromatography and high performance liquid chromatography, respectively. The quality of both oils was assessed as recommended by the American Oil Chemists' Society (AOCS) and stability was evaluated using 2,2-diphenyl-1-picrylhydrazyl (DPPH), β-carotene bleaching (coupled oxidation of β-carotene/linoleic acid) and Rancimat® assays. While α-linolenic acid (52%) was the most abundant fatty acid in linseed oil (LO), punicic acid (55%) was highest in pomegranate seed oil (PSO). Tocopherols and phytosterols (175 and 539 mg/100...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Punicic acid; Tocopherols; Phytosterols; Coupled oxidation of β-carotene; DPPH.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612016000100132
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Comparative analysis of fatty acids, tocopherols and phytosterols content in sunflower cultivars (Helianthus annuus) from a three-year multi-local study Phyton
Ayerdi Gotor,A; Berger,M; Labalette,F; Centis,S; Daydé,J; Calmon,A.
Sunflower oil is naturally rich in both unsaturated fatty acids and numerous minor components, with high levels ofa-tocopherol and phytosterols that could play an important role in plant protection. These micronutriments, tocopherols and phytosterols, also exhibit health benefits for humans including reducing both cardiovascular diseases and aging disorders. a−Tocopherol represents more than 95% of total sunflower tocopherol and has the greatest vitaminic activity. Furthermore, this oil contains high amounts of β-sitosterol which is a promising health beneficial phytosterol. The objective of this study was to compare the content and composition of fatty acids, tocopherols and phytosterols in sunflower oil between different cultivars and...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Sunflower oil; Fatty acids; Tocopherols; Phytosterols; Genotype x environment interaction; Temperature.
Ano: 2015 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572015000100004
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Effects of gamma irradiation on sugars, fatty acids and tocopherols of chestnuts (Castanea sativa Miller). IPB - Escola Superior Agrária
Barros, Lillian; António, Amílcar L.; Barreira, João C.M.; Fernandes, Ângela; Bento, Albino; Botelho, M. Luísa; Ferreira, Isabel C.F.R..
As seasonal products chestnuts have to be postharvest treated to increase their shelf-life. The most common preservation method for chestnuts is the use of chemical fumigation with methyl bromide, a toxic agent that is under strictly use under Montreal Protocol due to its adverse effects on human health and environment. Food irradiation is a possible feasible alternative to substitute the traditional quarantine chemical fumigation treatment. The main studies in chestnuts irradiation were done in an Asian variety, which is bigger and sweeter than the European types. However, on Portuguese varieties nothing has been reported. Herein, the influence of irradiation and storage time in sugars, fatty acids and tocopherols profiles/quantities in chestnuts...
Tipo: ConferenceObject Palavras-chave: Irradiated chestnuts; Gamma irradiation; Sugars; Fatty acids; Tocopherols.
Ano: 2011 URL: http://hdl.handle.net/10198/6081
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Evaluation of the functionality of bread loaves prepared with quinoa flakes through biological tests BJPS
Gewehr,Márcia Flach; Pagno,Carlos Henrique; Danelli,Daiane; Melo,Lívia Marchi de; Flôres,Simone Hickmann; Jong,Erna Vogt de.
ABSTRACT The aim of this study was to evaluate quinoa flakes and bread prepared with the pseudocereal with regard to nutritional aspects by determining chemical composition, content of tocopherols and fatty acid composition as well as to possible beneficial effects in Wistar rats given commercial feed supplemented or not with quinoa flakes and cholesterol. The following parameters were determined: weight gain, food intake, liver weight, fat in liver and lipid profile in blood and liver. The results showed that processing affected the nutritional characteristics of bread because there was a significant increase in dietary fiber content but reduction in soluble fiber. Increased fiber did not influence food intake or weight gain. Regarding fat in liver of...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Quinoa flakes/nutritional evaluation; Quinoa flakes/beneficial effects; Composition; Bread/processing/effects; Bread/ nutritional evaluation; Tocopherols.
Ano: 2016 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1984-82502016000200337
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Influence of the olive storage period on oil quality in the portuguese “Cobrançosa”, “Madural” and “Verdeal Transmontana” cultivars IPB - Escola Superior Agrária
Pereira, J.A.; Casal, S.; Bento, Albino; Oliveira, M.B.P.P..
Olives ( Olea europaeacv. Cobrancüosa, Madural, and Verdeal Transmontana) used for oil production were stored, in plastic containers, at 5 ( 2 °C (70% relative humidity) for three different periods before oil extraction: 0, 7, and 14 days (T0, T7, and T14, respectively). In the crop year 1997/1998 this procedure was done only for cv. Cobrancüosa and in 1998/1999 for the three cultivars. After storage, the oils were extracted from the fruits, and the acidity, peroxide value, coefficients of specific extinction at 232 and 270 nm, stability, color, p-anisidine value, fatty acids, and tocopherols compositions were determined. The results confirm that storage of fruits produces losses in the olive oil quality. Acidity and stability to oxidation indicate a...
Tipo: Article Palavras-chave: Olea europaea; Olive storage; Olive oil; Fatty acids; Tocopherols; Quality.
Ano: 2002 URL: http://hdl.handle.net/10198/722
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Low dose gamma-irradiation as a suitable solution for chestnut (Castanea sativa Miller) conservation: effects on sugars, fatty acids and tocopherols IPB - Escola Superior Agrária
Fernandes, Ângela; António, Amílcar L.; Barros, Lillian; Barreira, João C.M.; Bento, Albino; Botelho, M. Luísa; Ferreira, Isabel C.F.R..
Along with dehydration, the development of insects and microorganisms is the major drawback in chestnut conservation. Irradiation has been regaining interest as an alternative technology to increase food products shelf-life. In the present work, the effects of low dose gamma irradiation on sugars, fatty acids and tocopherols composition of chestnuts stored at 4 ºC for different storage periods (0, 30 and 60 days) was evaluated. The irradiations were performed in a 60Co experimental equipment, for 1 h (0.27 +/- 0.04 kGy) and 2 h (0.54 +/- 0.04 kGy). Changes in sugars and tocopherols were determined by high performance liquid chromatography (HPLC) coupled to refraction index (RI) and fluorescence detections, respectively, while changes in fatty acids were...
Tipo: Article Palavras-chave: Irradiated chestnuts; Gamma irradiation; Sugars; Fatty acids; Tocopherols.
Ano: 2011 URL: http://hdl.handle.net/10198/6228
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Nutritional composition, fatty acid and tocopherol contents of buriti (Mauritia flexuosa) and patawa (Oenocarpus bataua) fruit pulp from the amazon region Ciênc. Tecnol. Aliment.
Darnet,Sylvain Henri; Silva,Luiza Helena Meller da; Rodrigues,Antonio Manoel da Cruz; Lins,Roseana Telles.
Buriti and patawa are two endemic palm trees from the Amazon region. Their pulps are traditionally consumed by the local population, but are underused and lesser known worldwide. Nutritional composition, fatty acid and tocopherol contents of the two palm pulps were determined by modern analytical methods: Gas Chromatography (CG) and High Performance Liquid Chromatography (HPLC), based on the standards of AOCS (AMERICAN..., 2002) and AOAC (ASSOCIATION..., 1997), respectively. Buriti and patawa fruit pulps are highly nutritive, with respectively, high fat content (38.4% and 29.1% of dry matter (DM)), protein content (7.6% and 7.4% of DM) and dietary fibers (46% and 44.7% of DM). Buriti pulp can be considered healthy food due its high content of vitamin E...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Amazon; Pulp; Fruit; Palm; Buriti; Mauritia flexuosa; Patawa; Oenocarpus bataua; Lipids; Fatty acids; Tocopherols.
Ano: 2011 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612011000200032
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Oleic conversion effect on the tocopherol and phytosterol contents in sunflower oil Phyton
Ayerdi Gotor,A; Berger,M; Labalette,F; Centis,S; Daydé,J; Calmon,A.
In sunflower, conventional breeding is widely used for the modification of traits such as the fatty acid composition, disease resistance, and mainly for obtaining commercial oil with high oleic acid content. There is a growing interest on tocopherols and phytosterols present in sunflower, due to their human health benefits. This emphasizes the need of studies on breeding programs for these bioactive components. A hundred of isogenic pairs of classic and its oleic version of hybrids and parental lines were cultivated in different locations in France between 2003 and 2006. The results indicated that sunflower oil is rich in α-tocopherol and β-sitosterol. However, there was little correlation between traditional linoleic and oleic sunflower...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Sunflower; Oil; Oleic conversion; Phytosterols; Tocopherols.
Ano: 2014 URL: http://www.scielo.org.ar/scielo.php?script=sci_arttext&pid=S1851-56572014000200013
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Oxidative stability of soybean oil added to coffee husk extract (Coffea arabica L.) under accelerated storage conditions Ciênc. Tecnol. Aliment.
RIBEIRO,Elisa Franco; JORGE,Neuza.
Abstract Several plants have been studied as potential sources of natural antioxidants for use in the food industry, especially polyphenols. The aim of this study was to evaluate the effects of hydroalcoholic extract from coffee husk on the oxidative stability of soybean oil when stored in an oven. Samples were maintained at a temperature of 60 °C and their oxidative stability was evaluated once every 5 days for a period of 20 days through the Rancimat equipament and analysis of peroxide value, conjugated dienes and tocopherols retention. The oxidation rate in terms of mass gain was evaluated once every 24 hours for a period of 24 days. Although the antioxidant TBHQ showed a better efficiency in the inhibition of oxidation, coffee husk extract showed a...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Vegetable oils; Natural antioxidant; Mass gain; Agro-industrial waste; Tocopherols.
Ano: 2017 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0101-20612017000700005
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Sapucaia nut (Lecythis pisonis Cambess) and its by-products: a promising and underutilized source of bioactive compounds. Part I: nutritional composition and lipid profile. Repositório Alice
DEMOLINER, F.; POLICARPI, P. de B.; RAMOS, J. C.; BASCUÑAN, V. L. A. F.; FERRARI, R. A.; JACHMANIÁN, I.; CASAS, A. de F. de; VASCONCELOS, L. F. L.; BLOCK, J. M..
The nutritional composition of the sapucaia nut, cake and shell, the nut and cake minerals content and the lipid profile of the nut oil (fatty acids, tocopherols, phytosterols and triacylglycerols) were determined. The nuts and cake exhibited a high content of lipid (47.9 to 60.8 mg 100 g-1), protein (15.8 to 19.5 mg 100 g-1), dietary fiber (16.5 to 22.6 mg 100 g-1) and provided an excellent source of selenium (26.4 to 46.94 μg g-1). The oil contained a high amount of unsaturated fatty acids (39.7 to 45.4% of oleic and 32.2 to 46.6% of linoleic acids) and presented a high Oxidative Stability Index (8.57-12.95 h) indicating the presence of antioxidant compounds in the oil. The major triacylglycerols in the sapucaia oil were LLO, PLO, LOO, POO, OOO,...
Tipo: Artigo em periódico indexado (ALICE) Palavras-chave: Composição nutricional; Minerais; Ácidos graxos; Fatty acids; Triacylglycerols; Minerals; Selenium; Tocopherols; Phytosterols.
Ano: 2018 URL: http://www.alice.cnptia.embrapa.br/alice/handle/doc/1101205
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Tocopherols composition of Portuguese wild mushrooms with antioxidant capacity IPB - Escola Superior Agrária
Heleno, Sandrina A.; Barros, Lillian; Sousa, Maria João; Martins, Anabela; Ferreira, Isabel C.F.R..
The antioxidant composition and properties of 18 Portuguese wild mushrooms (Clitocybe alexandri, Cortinarius glaucopus, Fistulina hepatica, Hydnum repandum, Hygrophoropsis aurantiaca, Hypholoma capnoides, Laccaria amethystina, Laccaria laccata, Lactarius aurantiacus, Lactarius salmonicolor, Lepista inversa, Lepista sordida, Mycena rosea, Russula delica, Russula vesca, Suillus collinitus, Suillus mediterraneensis, Tricholoma sulphureum) were evaluated, in order to contribute to the overall characterisation of these products. Their radical-scavenging capacity, reducing power and inhibition of lipid peroxidation measured in liposome solutions was fully studied. Furthermore, the tocopherols composition was determined by HPLC-fluorescence. The analysed...
Tipo: Article Palavras-chave: Wild mushrooms; Tocopherols; HPLC; Antioxidant activity.
Ano: 2010 URL: http://hdl.handle.net/10198/2712
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Yellow passion fruit seed oil (Passiflora edulis f. flavicarpa): physical and chemical characteristics BABT
Malacrida,Cassia Roberta; Jorge,Neuza.
The aim of this study was to determine the chemical composition -physico-chemical properties, fatty acid and tocopherol compositions and total phenolic compounds -and evaluate the radical-scavenging activity of crude oil extracted from passion fruit (Passiflora edulis f. flavicarpa) seeds, aiming to use the agro-industrial by-products. The oil seed extraction was performed by Soxhlet method and the oil yield from the seeds was 30.39%. The oil showed high levels of unsaturated fatty acids (87.59%), including mainly linoleic (73.14%) and oleic (13.83%) acids, tocopherol (499.30 mg/kg) and phenolic compounds (1,314.13 mg GAE/kg). The physico-chemical characteristics were similar to those of other edible oils and the oil showed significant antioxidant...
Tipo: Info:eu-repo/semantics/article Palavras-chave: Passiflora edulis; Seed oil; Fatty acids; Tocopherols; Phenolic compounds.
Ano: 2012 URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1516-89132012000100016
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