Antioxidant activity and phenolic contents of Olea europaea L. leaves sprayed with different copper formulations

Ferreira, Isabel C.F.R.; Barros, Lillian; Soares, Maria Elisa; Bastos, Maria de Lourdes; Pereira, José Alberto

doi:10.1016/j.foodchem.2006.08.006

Cited by 105 publications

(72 citation statements)

References 31 publications

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“…A direct relationship has been found between the content of total phenolics and the antioxidant capacity of plants (Ferreira et al, 2007). Phenolic acids have been widely investigated as potential models for the development of new primary antioxidants, which can prevent or delay in vitro and/or in vivo oxidation processes (Siquet et al, 2006).…”

Section: Total Phenolic Contentmentioning

confidence: 99%

“…Tocopherols and carotenoids improve oil stability and thus oils naturally rich in these constituents are preferred (Warner and Frankel, 1987;Frankel, 1991). Phenols can act as antioxidants and reduce the risk of cancer and cardiovascular diseases (Burton, 1994;Burton and Traber, 1990;Ferreira et al, 2007). Sterols are essential components of cell membranes that play a role in controlling membrane fluidity and permeability.…”

Section: Introductionmentioning

confidence: 99%

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Chemical composition of oils from wild almond (Prunus scoparia) and wild pistachio (Pistacia atlantica)

Givianrad¹,

Saber-Tehrani²,

Mohammadi³

2013

Grasas y Aceites

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RESUMEN Composición química de aceites de almendras (Prunus scoparia) y pistachos silvestres (Pistacia atlantica)El objetivo de este estudio fue determinar la composición en ácidos grasos, esteroles, triglicéridos, así como tocoferoles, fenoles totales y pigmentos de aceites de almendras y pistachos silvestres prensados en frío. Triglicéridos (TAG), tocoferoles y pigmentos se analizaron mediante HPLC, los áci-dos grasos y esteroles mediante cromatografía de gases, y los fenoles totales espectrofotométricamente. Los principales ácidos grasos de ambas especies fueron los ácidos oleico, linoleico y palmítico. Las especies de TAG predominantes son SLL + OLP (21,83%) en el pistacho silvestre y OOO (47,27%) en almendras silvestre. Feofitina a es un pigmento importante en los aceites de pistacho silvestre. No se detectó pigmentos en los aceites de almendras silvestres. Los fenoles totales fueron 57,6 mg kg -1 y 45,3 mg kg -1 en los aceites de pistacho silvestre y de almendra silvestre respectivamente. PALABRAS CLAVE: Aceite de almendra Silvestre -Aceite de pistachio -Aceite prensado en frío -Ácidos grasosEsteroles -Fenoles Totales -Triacilgliceroles -Tocoferoles. SUMMARY Chemical composition of oils from wild almond (Prunus scoparia) and wild pistachio (Pistacia atlantica)The aim of this study was to determine the fatty acids, sterols and triacylglycerol compositions as well as the amount of tocopherols, total phenols and pigments wild almond and cold pressed wild pistachio oils. Triacylglycerols, tocopherols and pigments were analyzed with HPLC, fatty acids and sterols with gas chromatography, and total phenols photometrically. The main fatty acids in both samples were oleic, linoleic and palmitic acids. The most predominant TAG species are SLL + PLO (21.83%) in wild pistachio oil and OOO (47.27%) in wild almond oil. Pheophytin a was the major pigment in wild pistachio oil. There were no pigments detected in wild almond oil. Total phenols were 57.6 mg kg -1 oil for wild pistachio and 45.3 mg kg -1 oil for wild almond oil. KEY-WORDS: Cold pressed oil -Fatty acid -SterolTocopherol -Total phenol -Triacylglycerol --Wild almond oil -Wild pistachio oil.

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Section: Total Phenolic Contentmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Chemical composition of oils from wild almond (Prunus scoparia) and wild pistachio (Pistacia atlantica)

Givianrad¹,

Saber-Tehrani²,

Mohammadi³

2013

Grasas y Aceites

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“…Cu + 2 can also be synthesized as Cu(OH) 2 NPs. In general, the toxicity of copper compounds has been exploited to protect agricultural crops from many pests, including those causing fungal infections (Montes et al, 2015;Kalatehjari et al, 2015;Bramhanwade et al, 2016;Epstein and Bassein, 2001;Begum et al, 2015;Fan et al, 2011;El-Habbaa et al, 2016;Wightwick et al, 2008;Stansly and Kostyk, 2015;Thind and Singh, 2015;Ferreira et al, 2007), and copper pesticides are now applied on some "organic" crops (Baker et al, 2002;Winter and Davis, 2006). Their use as an antimicrobial agent has also been considered in several applications (Emam et al, 2014;Shebl, 2014;Mjos et al, 2016;Congrádyová et al, 2014).…”

Section: Introductionmentioning

confidence: 99%

Comparative environmental fate and toxicity of copper nanomaterials

et al. 2017

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A B S T R A C TGiven increasing use of copper-based nanomaterials, particularly in applications with direct release, it is imperative to understand their human and ecological risks. A comprehensive and systematic approach was used to determine toxicity and fate of several Cu nanoparticles (Cu NPs). When used as pesticides in agriculture, Cu NPs effectively control pests. However, even at low (5-20 mg Cu/plant) doses, there are metabolic effects due to the accumulation of Cu and generation of reactive oxygen species (ROS). Embedded in antifouling paints, Cu NPs are released as dissolved Cu + 2 and in nano-and micron-scale particles. Once released, Cu NPs can rapidly (hours to weeks) oxidize, dissolve, and form CuS and other insoluble Cu compounds, depending on water chemistry (e.g. salinity, alkalinity, organic matter content, presence of sulfide and other complexing ions). More than 95% of Cu released into the environment will enter soil and aquatic sediments, where it may accumulate to potentially toxic levels (> 50-500 μg/L). Toxicity of Cu compounds was generally ranked by high throughput assays as: Cu + 2 > nano Cu(0) > nano Cu(OH) 2 > nano CuO > micron-scale Cu compounds. In addition to ROS generation, Cu NPs can damage DNA plasmids and affect embryo hatching enzymes. Toxic effects are observed at much lower concentrations for aquatic organisms, particularly freshwater daphnids and marine amphipods, than for terrestrial organisms. This knowledge will serve to predict environmental risks, assess impacts, and develop approaches to mitigate harm while promoting beneficial uses of Cu NPs.

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“…A direct relationship has been found between the content of total phenolics and antioxidant capacity of plants (Ferreira, Baptista, Vilas-Boas, & Barros, 2007;Robards et al, 1999). In fact, to counteract deleterious action of ROS, phenolic compounds, naturally distributed in plants, are effective (Ferreira, Barros, Soares, Bastos, & Pereira, 2007;Pereira et al, 2006). Polyphenols are bioactive compounds believed to be involved in the defence process against deleterious oxidative damage, at least in part, due to their antioxidant properties (Fresco, Borges, Diniz, & Marques, 2006).…”

Section: Introductionmentioning

confidence: 99%

Antioxidant activities of the extracts from chestnut flower, leaf, skins and fruit

et al. 2008

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In this study, the antioxidant properties of chestnut (flowers, leaves, skins and fruits) extracts were evaluated through several biochemical assays: DPPH (2,2-diphenyl-1-picrylhydrazyl) radical-scavenging activity, reducing power, inhibition of b-carotene bleaching, inhibition of oxidative hemolysis in erythrocytes, induced by 2,2 0 -azobis(2-amidinopropane)dihydrochloride (AAPH), and inhibition of lipid peroxidation in pig brain tissue through the formation of thiobarbituric acid-reactive substances (TBARS). These assays have been extensively studied as models for the peroxidative damage in biomembranes. The EC 50 values were calculated for all the methods in order to evaluate the antioxidant efficiency of each chestnut extract. The phenol and flavonoid contents were also obtained. Chestnut skins revealed the best antioxidant properties, presenting much lower EC 50 values, particularly for lipid peroxidation inhibition in the TBARS assay. Furthermore, the highest antioxidant contents (polyphenols and flavonoids) were found for these extracts.

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Antioxidant activity and phenolic contents of Olea europaea L. leaves sprayed with different copper formulations

Cited by 105 publications

References 31 publications

Chemical composition of oils from wild almond (<i>Prunus scoparia</i>) and wild pistachio (<i>Pistacia atlantica</i>)

Chemical composition of oils from wild almond (<i>Prunus scoparia</i>) and wild pistachio (<i>Pistacia atlantica</i>)

Comparative environmental fate and toxicity of copper nanomaterials

Antioxidant activities of the extracts from chestnut flower, leaf, skins and fruit

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