scholarly journals Antioxidant Acitivity in Various Processed Products of Inferior Local Tubers (Dioscorea sp. L.)

2017 ◽  
Vol 3 (5) ◽  
pp. 35
Author(s):  
Ari Yuniastuti ◽  
Retno Sri Iswari ◽  
R. Susanti
Keyword(s):  
Antioxidant Activity ◽  
Bioactive Compounds ◽  
Antioxidant Activities ◽  
Different Types ◽  
Processed Products ◽  
Wild Yam

<p>Inferior local tubers such as lesser yam, wild yam and arrowroot contain bioactive compounds such as phenols and diosgenin which act as antioxidants.  Antioxidant activities in the processed of local tubers have not been reported. The aim of this research was to identify the antioxidant activity of local tubers (inferior) that has been processed through the process of steaming, frying and milling to be flour. The determination of antioxidant activity was performed using α, α, Diphenyl Picryl Hydrazil (DPPH), which is indicated as a percentage of the apprehension of radical activities by the amount of absorbance at 680 nm. The antioxidant activity of lesser yam steamed, fried and milled were 2.26 %, 0.84 %, and 3.34 % respectively. The antioxidant activity of steamed, fried and milled arrowroot were 1.44 %, 0.65 %, and 1.32 % respectively. Moreover, the antioxidant activity of steamed, fried and milled wild yam were 1.08 %, 0.08 %, and 0.82 % respectively. The antioxidant activity of inferior local tubers have decreased in different types of processing. The highest antioxidant activity was in the milled tubers followed by steamed and fried tuber. </p>

scholarly journals Bioactive Compounds, Antioxidant Activity and Growth Behavior in Lettuce Cultivars Grown under Field and Greenhouse Conditions

Proceedings ◽  
2020 ◽  
Vol 70 (1) ◽  
pp. 52
Author(s):  
Melisa Lanza Volpe ◽  
Verónica C. Soto Vargas ◽  
Anabel Morón ◽  
Roxana E. González
Keyword(s):  
Antioxidant Activity ◽  
Bioactive Compounds ◽  
Antioxidant Activities ◽  
Growth Conditions ◽  
Growth Behavior ◽  
Total Phenolic ◽  
Spectrophotometric Methods ◽  
Leafy Greens ◽  
Growing Conditions ◽  
Field Production

Lettuce (Lactuca sativa L.) is one of the most important leafy greens worldwide. The nutritional value of its edible leaf depends on different factors including type and growing conditions. The aim was to determine the bioactive compounds content, antioxidant activity and growth behavior of twenty-two lettuce genotypes, cultivated under field and greenhouse conditions. Total phenolic compound, chlorophylls, carotenoids, anthocyanin contents and antioxidant activities were analyzed by spectrophotometric methods. Data were analyzed by analysis of variance (ANOVA). Significant differences between bioactive compounds, antioxidant activity and growth behavior were found among cultivars and morphological types, for both growth conditions. Carotenoid and chlorophyll content was higher in greenhouse conditions for all genotypes. In field production, butterhead and iceberg lettuces showed lower content of these bioactive compounds. The red-pigmented Falbala cultivar from field production showed the highest level of polyphenols and anthocyanin. Meanwhile, in greenhouse conditions, the oak leaf cultivar Grenadine displayed the highest concentration of these phenolic compounds. The iceberg type lettuce showed the lowest percentages of antioxidant activity in both environments. The results showed the effect of growing conditions and the high variability in lettuce bioactive compounds content and antioxidant activity among the different types.

scholarly journals Eugenia Klotzschiana O. Berg Fruits as New Sources of Nutrients: Determination of their Bioactive Compounds, Antioxidant Activity and Chemical Composition

2019 ◽  
Vol 62 ◽  
Author(s):  
Nárgella Silva Carneiro ◽  
Cássia Cristina Fernandes Alves ◽  
Caroline Cagnin ◽  
Celso Martins Belisario ◽  
Marco Antônio Pereira da Silva ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Chemical Composition ◽  
Bioactive Compounds

scholarly journals HPLC Fingerprint of Bioactive Compounds and Antioxidant Activities of Viscum album from Different Host Trees

2011 ◽  
Vol 39 (1) ◽  
pp. 48 ◽  
Author(s):  
Simona Ioana VICAŞ ◽  
Olivia Dumitrita RUGINA ◽  
Loredana LEOPOLD ◽  
Adela PINTEA ◽  
Carmen SOCACIU
Keyword(s):  
Antioxidant Activity ◽  
Bioactive Compounds ◽  
Malus Domestica ◽  
Dry Matter ◽  
Total Phenolics ◽  
Antioxidant Activities ◽  
Viscum Album ◽  
Fraxinus Excelsior ◽  
Trolox Equivalent Antioxidant Capacity ◽  
Host Trees

Viscum album L. is a medicinal plants used for many years as a remedy in the traditional medicine and in complementary cancer therapies. We investigated the influence of some host trees: Acer campestre (VAA), Fraxinus excelsior (VAF), Populus nigra (VAP), Malus domestica (VAM), and Robinia pseudoacacia (VAR), on the chemical composition and antioxidant activity of leaves and stems from V. album, as well the influence of the solvent (water and ethanol) used for extraction on biological activity. HPLC with photodiode array detector analysis of bioactive compounds from leaves and stems of mistletoes (V. album) hosted by five differents trees was performed. Antioxidant activities, determined by the 2,2-diphenyl-1-picrylhydrazyl (DPPH), Oxygen Radical Absorbance Capacity (ORAC), (Trolox-equivalent antioxidant capacity (TEAC) methods were compared with the quantification of total phenolics using the Folin -Ciocalteu reagent. V. album hosted by Fraxinus excelsior (VAF), recorded the highest level of total phenolic acids (108.64 μg/g dry matter) while the mistletoe hosted by Malus domestica (VAM) had the lowest level of total polyphenols (39.37 μg/g dry matter). In general, higher antioxidant activity was detected in the alcoholic than in the aqueous extracts. The values obtained for total phenolics in both, aqueous and ethanol extracts, decreased in the order: VAR > VAF > VAP > VAA > VAM. The mistletoe stem extracts contained lower levels of phenolics, as compared to leaves, in both solvents. Our results suggest that mistletoe extracts possess significant antioxidant activities that may be due to their bioactive compounds content, suggesting that this plant may be an important source of natural products with chemopreventive and chemotherapeutic activities.

scholarly journals Nutrients and bioactive compounds of pulp, peel and seed from umbu fruit

2019 ◽  
Vol 49 (4) ◽  
Author(s):  
Leilson de Oliveira Ribeiro ◽  
Eliseth de Souza Viana ◽  
Ronoel Luiz de Oliveira Godoy ◽  
Sidinea Cordeiro de Freitas ◽  
Suely Pereira Freitas ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Vitamin C ◽  
Bioactive Compounds ◽  
Nutritional Composition ◽  
Total Phenolic ◽  
Total Carotenoids ◽  
Fresh Pulp ◽  
Main Barrier ◽  
By Products

ABSTRACT: The objective of this research was to evaluate the nutritional composition and bioactive compounds of whole umbu fruit, including pulp, seed and peel, and also of a commercial umbu pulp. Samples of the fractions and of commercial pulp were analyzed for determination of minerals and proximate composition, total phenolic and antioxidant activity. Pulps and peel were also analyzed for vitamin C and carotenoids contents. Commercial pulp presented better nutritional composition than fresh pulp (P<0.05) and the peel presented higher phenolic content and antioxidant activity than seed. Peel also stood out by its vitamin C (79 mg.100 g-1) and total carotenoids (2,751 µg.100 g-1) contents, showing that, as the main barrier of the fruit for its protection, it is a fraction rich in bioactive compounds. The highest dietary fiber and iron contents were observed in umbu seed (P<0.05). Therefore, umbu by-products may be ingredients proper for development of food richer in nutrients and bioactive compounds.

scholarly journals Development, characterization and antioxidant activity of polysorbate based O/W emulsion containing polyphenols derived from Hippophae rhamnoides and Cassia fistula

2013 ◽  
Vol 49 (4) ◽  
pp. 763-773 ◽  
Author(s):  
Barkat Ali Khan ◽  
Naveed Akhtar ◽  
Haroon Khan ◽  
Valdir de Andrade Braga
Keyword(s):  
Antioxidant Activity ◽  
Ph Value ◽  
Antioxidant Activities ◽  
Physical Stability ◽  
Tween 80 ◽  
Ionic Surfactant ◽  
Cassia Fistula ◽  
Ph Values ◽  
Different Types ◽  
Electrical Conductivity Data

The objective of this study was to develop a pharmaceutical O/W emulsion containing plant-derived polyphenol extracts and evaluate its stability and antioxidant activity. O/W emulsions were prepared using ionic surfactant polysorbate 80 (Tween 80®). The odorwas adjusted with few drops of blue sea fragrance. DPPH (1,1-diphenyl-2-picrylhydrazyl) assay was used to evaluate the antioxidant activity of the plant extracts alone and emulsions containing these extracts. Physical stability was assessed by submitting the emulsions to storage at 8 ºC, 25 ºC, 40 ºC and 40 ºC + 70% RH (relative humidity) for two months. Various physical characteristics of emulsions monitored, include color, creaming, liquefaction, centrifugation and pH. Brookfield rotational rheometer was used to determined viscosities and rheological behavior of emulsions. Different types of emulsion were determined microscopically, while pH values of emulsions were measured by a pH meter. Electrical conductivity data confirmed that the outer phase was water. Samples presented an acceptable pH value for an external topical use. Shear thinning behaviour was observed for all emulsions. The polyphenol-rich-plant-derived extracts alone and the extract containing emulsions showed good antioxidant activities. This research confirmed that the method used was suitable for preparing emulsions with Hippophae rhamnoids and Cassia fistula extracts, suggesting that those emulsions are suitable for topical use.

A Relationship between the Critical Oxidation Potentials and Antioxidant Activities of Rubber Antioxidants

1939 ◽  
Vol 12 (2) ◽  
pp. 287-291 ◽  
Author(s):  
C. M. Doede
Keyword(s):  
Antioxidant Activity ◽  
Antioxidant Activities ◽  
Optimum Range ◽  
Oxidation Potentials ◽  
A Value ◽  
Physico Chemical ◽  
Sole Criterion

Abstract 1. According to the data presented, all of the compounds tested which exhibit marked antioxidant activity have an Ec value between 0.65 volt and 0.90 volt. Many substances exist which have an Ec value within the optimum range, but do not have much antioxidant activity. The condition that the Ec value for a good antioxidant falls between 0.65 volt and 0.90 volt seems to be necessary but not sufficient. 2. A value of Ec within an optimum range seems to be only one of several possible physico-chemical phenomena which govern the rubber antioxidant activity of a compound. 3. The determination of the Ec value of a compound should not be used as the sole criterion of that compound's antioxidant activity.

scholarly journals Influence of drying on bioactive compounds and antioxidant activity of fruits of guabiju (Myrcianthes pungens)

2021 ◽  
Vol 10 (8) ◽  
pp. e5510817024
Author(s):  
Vanessa Barbieri Bombana ◽  
Carolina Elisa Demaman Oro ◽  
Diane Rigo ◽  
Caroline Chies Polina ◽  
Andressa Franco Denti ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Phenolic Compounds ◽  
Vitamin C ◽  
Water Activity ◽  
Bioactive Compounds ◽  
Antioxidant Activities ◽  
Dry Extract ◽  
Influence Of Temperature ◽  
Physical Chemical ◽  
Influence Of Temperature On

The objective of this work was to evaluate the influence of temperature on the content of bioactive compounds of fruits of guabiju (Myrcianthes pungens (O. Berg) D. Legrand). The peel, pulp and seed of fresh guabiju were analyzed in relation to physical-chemical composition, metals, color, phenolic compounds, flavonoids, anthocyanins, vitamin C and antioxidant activity. On the dehydrated samples at temperature of 60 °C, where also determined the moisture and water activity. The fractions of the fruit showed high amounts of metals. After drying, moisture of 1.3, 1.0 and 0.9% were observed for peel, pulp and seed and water activity of 0.44 to 0.54. All the samples darkened, with less variation in the dehydrated peel (∆E 9.2). The samples showed high values of bioactive compounds, and in the fresh peel were observed higher levels of phenolic compounds (8459.8 mg EGA/100g dry extract), anthocyanins (152.0 mg/100 dry extract) and vitamin C (222.9 mg/100g) and on the dehydrated seed higher value of flavonoids (7480.7 mg EQ/100g dry extract). There was 86.3% degradation of anthocyanins in the dehydrated peel. The best values of antioxidant activities were obtained for the dehydrated peel (IC50 1.37 mg/mL), seed (IC50 1.49 mg/mL) and in the fresh peel (IC50 1.41 mg/mL).

scholarly journals Determination of antiradical and antioxidant activity: basic principles and new insights.

2010 ◽  
Vol 57 (2) ◽  
Author(s):  
Gunars Tirzitis ◽  
Grzegorz Bartosz
Keyword(s):  
Antioxidant Activity ◽  
Antioxidant Activities ◽  
Basic Principles ◽  
Definition Of

Although the term 'antioxidant' is used very frequently, there are problems with the definition of antioxidants and estimation of antioxidant activity. The distinction between antioxidant and antiradical activities is not always obvious. This minireview discusses critically the principles, advantages and limitations of the most frequently used methods of estimation of antiradical and antioxidant activities.

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