scholarly journals Antioxidant density of Hungarian kapia and red bell pepper varieties

2006 ◽  
pp. 80-84
Author(s):  
Zsuzsanna Veres ◽  
Miklós Gábor Fári
Keyword(s):  
Blood Pressure ◽  
Ascorbic Acid ◽  
Vitamin C ◽  
Antioxidant Capacity ◽  
Fruits And Vegetables ◽  
Hdl Cholesterol ◽  
Bell Pepper ◽  
Biological Value ◽  
Total Antioxidant ◽  
A Cell

There is a lot of evidence that the pepper is one of the most important sources of vitamin C. Albert Szent-Györgyi was the first to extract ascorbic acid from a red bell pepper in the 1930s. Previously people had eaten vitamin C on the long voyage to protect against scurvy. Vitamin C is an important antioxidant, and it is a cell protector today. Vitamin C protects the cardiovascular system against infection. This vitamin decrease blood-pressure, a raises the HDL cholesterol level (good), and inhibits gout.„Antioxidant density” is a biological value indicator obtained in synthetic way. „Antioxidant density” indicates the antioxidant capacity of a particular food, e. g. fruits and vegetables, related to 1 Calorie. In our study, we measured the total antioxidant capacity, vitamin C content and „antioxidant density” of Hungarian paprika varieties.

scholarly journals Total antioxidant and ascorbic acid content of fresh fruits and vegetables: implications for dietary planning and food preservation

2002 ◽  
Vol 87 (1) ◽  
pp. 55-59 ◽  
Author(s):  
Yim Tong Szeto ◽  
Brian Tomlinson ◽  
Iris F. F. Benzie
Keyword(s):  
Ascorbic Acid ◽  
Antioxidant Capacity ◽  
Total Antioxidant Capacity ◽  
Fruits And Vegetables ◽  
Reduced Form ◽  
Kiwi Fruit ◽  
Antioxidant Power ◽  
Wide Range ◽  
Total Antioxidant ◽  
Wet Weight

Epidemiological evidence links high intake of ascorbic acid (AA) and other antioxidant micronutrients to health promotion. It would be useful to know the overall, or ‘total’ antioxidant capacity of foods, to establish the contribution of AA to this, and to assess how this information may translate into dietary intakes to meet the new US daily reference intake for AA. In this study, the total antioxidant capacity, as the ferric reducing–antioxidant power (FRAP) value, and AA content of thirty-four types of fruits and vegetables were measured using a modified version of the FRAP assay, known as FRASC. This measures AA (reduced form only) simultaneously with the FRAP value. Results covered a wide range: 880–15 940 μmol/kg fresh wet weight and <20–540 mg/kg fresh wet weight respectively, for FRAP and AA, which comprised <1–73 % and <1–59 % total antioxidant capacity of fruits and vegetables respectively. We estimate that 100 mg AA is contained in one orange, a few strawberries, one kiwi fruit, 1–2 slices of pineapple, several florets of raw cauliflower or a handful of uncooked spinach leaves. Apples, bananas, pears and plums, the most commonly consumed fruits in the UK, contain very little AA. Results indicate also that the antioxidant capacity of vegetables decreases rapidly and significantly after fragmentation. Results of this, and future studies, using FRASC as a biomonitoring tool will be useful in food production, preparation, preservation, and aid dietary choices to increase antioxidant and AA intake. Furthermore, FRASC will facilitate bioavailability studies of antioxidants from different foods of known antioxidant capacity and AA content.

scholarly journals Essential Features for Antioxidant Capacity of Ascorbic Acid (Vitamin C)

2021 ◽  
Author(s):  
Kelton L. B. Santos ◽  
Vitor A. N. Bragança ◽  
Larysse V. Pacheco ◽  
Sirlene S. B. Ota ◽  
Christiane P. O. Aguiar ◽  
...  
Keyword(s):  
Ascorbic Acid ◽  
Vitamin C ◽  
Antioxidant Capacity ◽  
Fruits And Vegetables ◽  
Functional Group ◽  
Cellular Level ◽  
Theoretical Chemistry ◽  
Molecular Characteristics ◽  
Theoretical Studies ◽  
Citrus Species

Abstract Vitamin C or ascorbic acid is an indispensable micronutrient for human health found principally on citrus species such as lemon and orange fruits, and vegetables. It was involved in the production of proteins such as collagen. Its biochemical mechanism is related to its antioxidant capacity, however its function at the cellular level is still unclear. Several theoretical studies about antioxidant and redox mechanisms for ascorbic acid were suggested, however no derivative was proposed. Thereby, an electronic study of antioxidant capacity for ascorbic acid derivatives was performed using theoretical chemistry at the DFT/ B3LYP/6-311++(2d,2p) level of theory. Simplified derivatives show that enol hydroxyls are more important than any other functional group. The vicinal enolic hydroxyl on β-position are more important for antioxidant capacity of ascorbic than hydroxyl on α-position. According to our molecular modifications, the keto-alkene compound showed the best values when compared to ascorbic acid in some molecular characteristics. New promising structural derivatives related to ascorbic acid can be developed in the future.

scholarly journals The bioactive compounds of sour cherry (Prunus cerasus) with special regards to antioxidant activity and antioxidant density

2005 ◽  
pp. 83-87
Author(s):  
Zsuzsanna Veres ◽  
Judit Remenyik ◽  
József Nyéki ◽  
Zoltán Szabó ◽  
László Popovics ◽  
...  
Keyword(s):  
Cardiovascular Disease ◽  
Antioxidant Capacity ◽  
Bioactive Compounds ◽  
Fruits And Vegetables ◽  
Disease Risk ◽  
Sour Cherry ◽  
Prunus Cerasus ◽  
Biological Value ◽  
Chronic Disease Risk ◽  
Total Antioxidant

Evidence suggests that a diet high in fruits and vegetables may reduce the risk of chronic diseases, such as cardiovascular disease and cancer, and phytochemicals including phenolics, flavonoids and carotenoids from fruits and vegetables may play a key role in reducing chronic disease risk. Recent research has proven that sour cherry (Prunus cerasus L.) is a valuable natural source of some bioactive compounds important in human health preservation.In our work, we identified the total antioxidant capacity and ”antioxidant density” of sour cherry varieties named ”Újfehértói fürtös”, ”Debreceni bõtermõ”, ”Kántorjánosi” and ”Érdi bõtermõ” and those of the ”Bosnyák” sour cherry clones. ”Antioxidant density” is a biological value indicator obtained in a synthetic way, which indicates the antioxidant capacity of the particular food, e. g. fruit and vegetable, per 1 Calorie.

scholarly journals Total Antioxidant Capacity and Lipid Peroxidation Status in Cervical Cancer Patients Compared with Women Without Cervical Cancer in Bangladesh

2021 ◽  
Vol 19 (4) ◽  
Author(s):  
Taslima Nigar ◽  
Annekathryn Goodman ◽  
Shahana Pervin
Keyword(s):  
Oxidative Stress ◽  
Cervical Cancer ◽  
Lipid Peroxidation ◽  
Ascorbic Acid ◽  
Antioxidant Capacity ◽  
Cancer Patients ◽  
Total Antioxidant Capacity ◽  
Stress Index ◽  
Oxidative Stress Index ◽  
Total Antioxidant

Abstract Purpose Over the past several decades, research has suggested reactive oxygen species act as cofactors for cervical cancer development. The aim of this study is to evaluate the antioxidant and lipid peroxidation status in cervical cancer patients in Bangladesh. Methods From December 2017 to 2018, a cross-sectional observational study was conducted on 50 cervical cancer patients and 50 controls. Plasma levels of lipid peroxidation and total antioxidant capacity were measured. The Student’s t test was used for statistical analysis. P values less than 0.05 were taken as a level of significance. Results There was a significant reduction in total antioxidant levels in patients with cervical cancer, 972.77 ± 244.22 SD µmol equivalent to ascorbic acid/L, compared to normal controls, 1720.13 ± 150.81 SD µmol equivalent to ascorbic acid/L (P < 0.001). Levels of lipid peroxidation were found to be significantly higher in cervical cancer, 7.49 ± 2.13 SD µmol/L, than in women without cervical cancer, 3.28 ± 0.58 SD µmol/L (P < 0.001). The cervical cancer patients had significantly higher levels of oxidative stress index (0.83 ± 0.31) in comparison to controls (0.19 ± 0.04) (P < 0.001). Conclusion There was an increased oxidative stress index due to imbalance between lipid peroxidation generation and total antioxidant capacity in cervical cancer patients. Further studies are needed to explore the role of oxidative stress as a cofactor for cervical carcinogenesis.

Frutos silvestres de Anisocapparis speciosa “pajagua naranja” composición proximal, minerales y potencial antioxidante

2021 ◽  
Vol 2 (5) ◽  
pp. 6608-6618
Author(s):  
Eva Coronel ◽  
Silvia Caballero ◽  
Gabriela Gonzalez ◽  
Miho Sunguino ◽  
Laura Mereles
Keyword(s):  
Vitamin C ◽  
Antioxidant Capacity ◽  
Dietary Fiber ◽  
Total Antioxidant Capacity ◽  
Radical Scavenging ◽  
Natural Antioxidants ◽  
Indigenous Populations ◽  
Soluble Solids ◽  
Gran Chaco ◽  
Total Antioxidant

Los frutos de Anisocapparis speciosa son nativas de la Ecoregión del Gran Chaco, crecen de manera silvestre en todo este territorio, su pulpa y semillas son comestibles y muy apreciadas por las poblaciones indígenas que lo habitan, además de otros usos con propiedades medicinales atribuidas por conocimientos etnobotánicos, pero no se tienen datos sobre la composición de estos frutos regionales y sus potenciales aplicaciones. El objetivo del presente trabajo fue evaluar la composición de la pulpa y semillas de frutos en estado maduro, y el potencial antioxidante en diferentes estadíos de madurez. La composición proximal, el contenido de minerales, vitamina C y solidos solubles se realizaron según metodologías oficiales de la AOAC.  Los fenoles totales se determinaron por el método de Folin Ciocalteau y la capacidad antioxidante total por medio de la inhibición del radical ABTS. Los componentes mayoritarios en pulpa y semillas fueron carhobidratos y fibra alimentaria. La pulpa madura posee un buen contenido de vitamina C (20 mg/100g). El contenido de fenoles y capacidad antioxidante total fue mayor en la pulpa que en la semillas en estados inmaduros. Los frutos de Anisocapparis speciosa pueden representar una buena fuente de carbohidratos, fibra alimentaria, Mg y vitamina C en la dieta. La pulpa y semillas son fuentes de antioxidantes naturales. Estudios futuros sobre métodos postcosecha, almacenamiento y procesamiento serán necesarios para potenciar su uso y re-valorización en el marco de la Seguridad alimentaria en la población regional.   The native Anisocapparis speciosa fruits from Gran Chaco Ecoregion, they grow wild throughout this territory, their edible pulp and seeds are highly appreciated by the indigenous populations that inhabit it, in addition to other uses with medicinal properties attributed by ethnobotanicals knowledge, but there are no data on the composition of these regional fruits and their potential applications. The aims of the present work were to analyze the pulp and seeds composition of fruits in the ripe state, and the antioxidant potential in different stages of maturity. The proximal composition, minerals content, vitamin C and soluble solids were carried out according to official AOAC methodologies. The total phenolics compounds (TPC) by the Folin Ciocalteau method and the total antioxidant capacity by means of the inhibition of the radical ABTS were evaluated. The main components in pulp and seeds were carbohydrates and dietary fiber. The ripe pulp has a good content of vitamin C (20 mg/100g). The content of TPC and total antioxidant capacity (ABTS radical scavenging) was higher in pulp than in the seeds, in immature stages. The Anisocapparis speciosa fruits can represent a good source of carbohydrates, dietary fiber, Mg and vitamin C in the diet of regional populations. The pulp and seeds are sources of natural antioxidants. Future studies on post-harvest, storage and processing methods will be necessary to enhance its use and re-valorization within the Food Security framework.  

scholarly journals The effect of lyophilization on selected biologically active components (vitamin C, catalase, lysozyme), total antioxidant capacity and lipid oxidation in human milk

2017 ◽  
Vol 112 (3) ◽  
pp. 121-128
Author(s):  
Dorota Martysiak-Żurowska ◽  
Małgorzata Puta ◽  
Anna Rodzik ◽  
Edyta Malinowska-Pańczyk
Keyword(s):  
Vitamin C ◽  
Human Milk ◽  
Lipid Oxidation ◽  
Antioxidant Capacity ◽  
Total Antioxidant Capacity ◽  
Freeze Drying ◽  
Biologically Active ◽  
Initial Water Content ◽  
Initial Water ◽  
Total Antioxidant

Human milk is rich in polyunsaturated fatty acids, as well as lysozyme, vitamin C and other bioactive compounds. The effect of lyophilization on the content of antioxidants (vitamin C and catalase CAT), bactericidal compounds (lysozyme), total antioxidant capacity (TAC) and lipid peroxidation in human milk was investigated in this study. Samples of mature human milk were collected from five healthy women who gave birth on the scheduled date and without complications. Freeze drying resulted in the removal of 88.2 % of the initial water content from milk. The human milk lyophilizate was readily soluble in water. Lyophilization had no effect on the content of primary (lipid peroxides LP) and secondary (thiobarbituric acid reactive substances TBARS) products of lipid oxidation. Freeze-drying led to a significant decrease in the vitamin C content and TAC values of milk (by 31 % and 16.5 %, respectively). Catalase and lysozyme were resistant to freeze-drying. Lyophilization induced a decrease in lysozyme content (9 %) and catalase activity (11 %) but these changes were not statistically significant. Low-temperature dehydration and rehydration of human milk lyophilizates promote satisfactory retention of biologically active ingredients and prevent the oxidation of human milk lipids. The results of this study indicate that lyophilization can be considered as an effective method for prolonging the shelf life of human milk.

scholarly journals Antioxidant and cytotoxic activities of Ageratum conyzoides stems

2013 ◽  
Vol 2 (2) ◽  
pp. 33-37 ◽  
Author(s):  
Fatema Nasrin
Keyword(s):  
Ascorbic Acid ◽  
Antioxidant Capacity ◽  
Total Antioxidant Capacity ◽  
Reducing Power ◽  
Total Phenolic ◽  
Cytotoxic Activities ◽  
Ageratum Conyzoides ◽  
Reducing Ability ◽  
Ic50 Value ◽  
Total Antioxidant

Modern civilization is facing more than hundreds of disorders associated with free radicals and natural antioxidants from non-edible plants are gaining importance to fight these disorders. The intention of this report is to evaluate a well known medicinal weed Ageratum conyzoides stems for its antioxidant and cytotoxic Effects. Antioxidant potentiality of the crude methanolic extract of the Ageratum conyzoides (AC) stems was investigated on DPPH scavenging activity, reducing ability, total antioxidant capacity as well as total phenolic contents. Cytotoxic study was done by brine shrimp lethality bioassay and vincristin sulphate was used as standard. The total phenols and total antioxidant capacity of AC was found to be 38.125 ± 2.01mg/g equivalent of gallic acid and 333.37 ± 4.22mg/gm equivalent of ascorbic acid, respectively. The percentage (%) scavenging of DPPH free radical of the extract was found to be concentration dependent with IC50 value 46.01 ± 2.23µg/ml while IC50 value of standard ascorbic acid was found to be 29.56 ± 0.11?g/ml. The reducing power of AC was found to be concentration dependent. The cytotoxicity exhibited by AC was found promising with LC50 value 1.32?g/ml, comparing with the LC50 (0.689?g/ml) values of vincristin sulphate. The present investigation suggests that Ageratum conyzoides possesses remarkable antioxidant and cytotoxic property.DOI: http://dx.doi.org/10.3329/icpj.v2i2.13195 International Current Pharmaceutical Journal 2013, 2(2): 33-37

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