scholarly journals Nonionic Model Microemulsions to Study Interactions with Active Components and Antioxidant Activity

10.5772/37967 ◽  
2012 ◽  
Author(s):  
Joakim Balogh ◽  
Lus Marques ◽  
Antnio Lopes
Keyword(s):  
Antioxidant Activity ◽  
Active Components

scholarly journals Analysis of Antioxidant and Antiallergic Active Components Extracted From the Edible Insect Oxya yezoensis

2021 ◽  
Vol 16 (5) ◽  
pp. 1934578X2110233
Author(s):  
Masahiro Saiki ◽  
Naomichi Takemoto ◽  
Maki Nagata ◽  
Masako Matsumoto ◽  
Yhiya Amen ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Phenolic Compounds ◽  
Unsaturated Fatty Acids ◽  
Soluble Fraction ◽  
Total Phenolic ◽  
Key Factors ◽  
Active Components ◽  
Food And Agriculture ◽  
Food And Agriculture Organization

In recent years, entomophagy has attracted increased attention, as it was recommended as a potential source of food by the Food and Agriculture Organization of the United Nations. In Japan, Oxya yezoensisis one of the most widely eaten insect species, but studies of its functionality as a food are limited. In this study, we reported the optimal characterization of the total phenolic compounds in methanolic extract (OME) and different fractions of OME. Additionally, the antioxidant and antiallergic activities of the OME fractions were evaluated. The results showed that the ethyl acetate-soluble fraction of OME has potential antioxidant activity, whereas the n-hexane-soluble fraction showed the strongest inhibition of β-hexosaminidase, which is one of the key factors in allergic reactions. It was concluded that phenolic compounds might contribute to the antioxidant activity while unsaturated fatty acids contribute to the antiallergy activity.

scholarly journals Studies on the Active Components and Antioxidant Activity of the Extracts from Different Parts of Bamboo

2013 ◽  
Vol 25 (11) ◽  
pp. 6354-6360 ◽  
Author(s):  
Yu-Xian Li ◽  
Fang-Rong Cheng ◽  
Yong-Chun Jin ◽  
Ke Yuan
Keyword(s):  
Antioxidant Activity ◽  
Active Components ◽  
Different Parts

Effects of Growing Location on the Contents of Main Active Components and Antioxidant Activity ofDasiphora fruticosa(L.)Rydb. by Chemometric Methods

2018 ◽  
Vol 15 (7) ◽  
pp. e1800114 ◽  
Author(s):  
Wei Liu ◽  
Dongmei Wang ◽  
Xiaogai Hou ◽  
Yueqin Yang ◽  
Xian Xue ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Chemometric Methods ◽  
Active Components

scholarly journals Antioxidant Activity of Metabolites from Coleonema Album (Rutaceae)

2006 ◽  
Vol 1 (5) ◽  
pp. 1934578X0600100 ◽  
Author(s):  
Lindy L. Esterhuizen ◽  
Riaan Meyer ◽  
Ian A. Dubery
Keyword(s):  
Antioxidant Activity ◽  
South African ◽  
Structural Information ◽  
Radical Scavenging Activity ◽  
Radical Scavenging ◽  
Reducing Power ◽  
Active Components ◽  
Bioassay Guided Fractionation ◽  
The Relationship

Coleonema album, a member of the South African ‘Fynbos’ biome, was evaluated for its antioxidant and free radical scavenging activity. Ethanol- and acetone-based extracts from plant material obtained from two different geographical areas were analysed. A bioassay-guided fractionation methodology was followed for screening of active compounds. The 1,1-diphenyl-2-picrylhydrazyl (DPPH)-TLC method revealed the presence of a number of antioxidants which were quantified by the DPPH-spectrophotometric assay and the oxygen radical absorbance capacity (ORAC) assay. The C. album extracts possessed significant in vitro antioxidant activity, a large portion of which appeared to be contributed by the phenolic compounds. In contrast, the reducing power of the extracts could not be correlated with the observed antioxidant activity. Identification and structural information of the active components were obtained by a combination of preparative TLC and LC-MS which revealed the presence of coumarin aglycones and glycosides. The results of this study indicate that C. album contains strong antioxidants that warrant further investigation into the relationship between the structure and activity of the active coumarin metabolites.

Natural Antioxidants in Hevea Latex

1948 ◽  
Vol 21 (3) ◽  
pp. 752-764 ◽  
Author(s):  
R. F. A. Altman
Keyword(s):  
Amino Acids ◽  
Antioxidant Activity ◽  
Water Layer ◽  
Natural Antioxidants ◽  
Antioxidant Action ◽  
Active Components ◽  
Naturally Occurring ◽  
Increasing Demand ◽  
Low Nitrogen ◽  
Soluble Fractions

Abstract An elaborate investigation on the identity and usefulness of the antioxidants naturally occurring in Hevea latex is of value because there is an increasing demand for special types of rubber with low nitrogen and ash contents, less water absorption, better electrical properties, and less odor than common crepe, and because these rubbers are generally unstable in comparison with the usual grades of rubber crepe and sheet. for the purpose of the investigation, fresh latex was separated into main-fractions, the most important of which have been called water-solubles and ether-solubles. These were further separated into various subfractions, which, one by one, have been tested for their antioxidant activity on raw rubber. In the following table only those fractions which show an outstanding antioxidant action are recorded. It is shown further that the amino acids are most remarkable in their antioxidant action : minute quantities exert a strong retarding action on the oxidation of raw rubber. Choline and cephaline are most probably the active components of the second water layer. The active ether-soluble fractions could not be identified due to the small quantities separated.

Curry Leaf and its Antioxidant Potential: A Systematic Study to Enhance its Activity in Aqueous Medium

2020 ◽  
Vol 16 (3) ◽  
pp. 323-332
Author(s):  
Deepa Kumari ◽  
Tamanna Mallick ◽  
Abhijit Karmakar ◽  
Samiran Mondal ◽  
Sreeparna Das ◽  
...  
Keyword(s):  
Antioxidant Activity ◽  
Aqueous Medium ◽  
Systematic Study ◽  
Water Soluble ◽  
Active Components ◽  
Chemical Methods ◽  
Lady’S Finger ◽  
Encapsulation Process ◽  
Set Up

Background: We have done a systematic study on the antioxidant activity of the methanol and petroleum ether (60-80°C) extracts (MEC and PEC respectively) of Curry leaves (Murraya koenigii Spreng. Family: Rutaceae) using various in-vitro chemical methods. Methods: Both of these two extracts were found to be highly efficient in the formation of Ag and Au nanoparticles. So, we have explored their ability to form the nanoparticles to study their antioxidant activity. In all the assay systems, MEC showed higher activity over PEC in aqueous medium. This may be due to the higher solubility of MEC and its active components, like polyphenols and flavonoids in the aqueous medium. PEC contains lesser amount of these water soluble active components but PEC was rich in carbazole types of alkaloids which are hydrophobic in nature. So, to enhance the antioxidant activity of PEC and its carbazole constituents, like 2-hydroxy carbazole and mahanimbine, we have encapsulated these in the biopolymeric matrix of the mucilage isolated from an edible vegetable, Abelmoschus esculentus L. (commonly known as Lady's finger, family: Malvaceae). Results: It was interesting to note that, PEC and its carbazole compounds showed better antioxidant activity (ferrous ion chelation and ferric reducing antioxidant activity) in aqueous medium after this encapsulation process. Conclusion: The protocols used in the present study were very simple and can be implemented in any lab set-up. In future, this work can be extended to evaluate antioxidant potentials of other plant based materials.

Antioxidant activity of ginger extract and identification of its active components

2015 ◽  
Vol 8 (2) ◽  
pp. 115-119 ◽  
Author(s):  
Silvia Mošovská ◽  
Dominika Nováková ◽  
Michal Kaliňák
Keyword(s):  
Antioxidant Activity ◽  
Phenolic Compounds ◽  
Cation Radical ◽  
Zingiber Officinale ◽  
Dpph Radical ◽  
Nmr Analysis ◽  
Active Components ◽  
Ginger Extract ◽  
Total Polyphenols ◽  
Spectrophotometric Methods

Abstract The object of presented study was the evaluation of antioxidant activity of extract from Zingiber officinale. A method for the preparation of the extract was chosen, which enabled to isolate mostly phenolic compounds. According to the measurements with Folin-Ciocalteu reagent, obtained extract comprised total polyphenols (181.41 mgGAE/g of extract) from which flavonoids contributed to 7.8 % (14.15 mgquercetin/g of extract). Nuclear magnetic resonance (NMR) analysis showed that the phenolic ketones were predominant in the extracts of whole phenolic compounds. According to results of two spectrophotometric methods (ABTS and DPPH test), ginger extract showed stronger ability to scavenge DPPH radical than ABTS cation radical.

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